How To Do A Compression Test!
Vložit
- čas přidán 23. 08. 2024
- Hey everyone! I got a few requests for this one, and it just so happened that I needed to do it this weekend. Plenty more coming your way, with daylight savings I barely have any time to film, but I'm working on it!
![How To Perform a Compression Test - [EASY]](http://i.ytimg.com/vi/3VmmL0YAO14/mqdefault.jpg)
Following your excellent video I did a compression test this morning on a 1.6L. Very helpful. And the job took under an hour. I believe that the relay you removed, on the passenger side of the engines, in order to de-power the fuel pump, is the main relay for the engine. That worked. Compression was fine (average 188 plus or minus 3 PSI), however, I discovered that the wire-set connector to one of the plugs had not been making full contact. There was a gap, and the charge for the plug had been arcing across the gap, The wire set was high quality (NGK) and less than a year old, but that connector was degraded. When you have an elusive problem, doing all the basic tests really helps.
man you are very good at explaining things and your videos are professional. You have been a blessing to everyone. Greetings from Birmingham, AL
i had a compression done at the shop last week, daaaamn i coulda done it from the comfort of my driveway with this
amazing vid, ive seen compression tests before, but nothing this detailed, thanks
+supraking85 Dang, and I thought everyone might think it's too boring!
dont be daft, you know your stuff and it shows.
+TheCarPassionChannel Its always nice to see someone else s approach on a topic, you make great vids keeps them coming.
so on the wet test did al cylinders come out of 200?
First off thanks for the video and great job! I noticed out all the videos I have watched you are the only one I have seen do this test according to ASE standards. I read in the ASE study materials that you must disable the fuel and ignition system when conducting an engine compression test. I wanted to get a visual on how the test was actually performed and continued to see so called Professionals skip these steps and some just disconnect the fuel connection and also push all the way down on the accelerator to disable the fuel pump and I was baffled as to why the study materials suggested this when it seemed that no one to need to do this, somebody had to have it wrong. Then finally I see you followed the instructions for performing this test, It made me realize I can't trust every CZcams video from so called professionals. Anyway I'm in school still learning and wanted to learn the right way so again thanks a lot for being thorough I'm definitely subscribing.
Thanks! I try my best to put out the most accurate information possible.
awesome videos man. very detailed content and very helpful information. keep on doing what you're doing you're helping a lot of people
I Really like how you explain things clearly. This OG sure has learned a great deal from this young buck! I can't Thank You Enough!!!
Great knowledge shared. THX! It is 9 PM here and I am fairly close to going out to the garage to check my compression.
Head gasket replacement? Hell yes! Never seen that done. Much interested. Very please.
I'm still waiting for that.
m valentino same bro same
Can't wait for more videos! Its my dream to buy and build up a miata and take it on a road trip from maine to california. Get to carve the canyons like i've watched so many videos of on youtube! Boosted of course!
I cant say enough good things about this channel. I really appreciate you doing these videos man. How/where can I make a donation to your cause?
+Casey Lockwood Haha much appreciated! I love hearing from people that find the videos helpful, it's really motivating to keep making more videos. I don't really have anything set up for that other than my normal paypal account, rcman299@email.com. Anything in particular you'd like to see on the channel in the future?
+TheCarPassionChannel Do you mean Gmail.com? And what you have planned sounds perfect! The broke and boosted series especially interests me, but my car will need a timing belt done soon, so that is relevant to my interests as well!
Casey Lockwood Nope that's not a typo, haha. I need to switch the account over to my Gmail, just haven't yet. I should have the timing belt/water pump video up some time next week/weekend. I was planning on doing that first, but I really need to replace my head on the other car now so I have to prioritize. Head gasket, timing belt, and coilover videos are planned for this month for sure, as well as more B&B stuff. I plan on filming a bunch of stuff this weekend.
And that's exactly how you should do a compression test! Still need to do one on my Miata.. 195k miles and will be boosted soon!
I don't know why but, knowing that there are simple, and to-the-point videos like this make me feel less worried and instead takes some weight off my shoulders lol.
Ah yes ho
Easily the the most helpful videos on youtube man! Keep it up
Hey Greg man I've been watching your vids for years and I'm about to get a miata tomorrow! If everything checks out lol I just wanted to say how much I appreciate your videos man. Really made me feel alot better about getting a miata. I'm in the process of starting a channel, and just wanted to say you're amazing for the miata community.
Awesome man well good luck tomorrow!!
Never actually bothered torquing down my plugs, but I will now. Been torquing everything properly since a I got a torque wrench lol.
That said, my Dad taught me to change plugs, he always said "finger tight and then 1/4 turn" and he was not far wrong!
Just had timing belt done on my 2000 miata and asked for a compression test at first and to call me if any issues before proceeding with any other work. 110,110,110,120 so...... yeah kinda pissed at that shop now. Especially as they are one of the most reputable in my area.
need to do the water belt on mine too! 😂 lookin forward to it!
+Matt Lowe Hahaha
Surprisingly detailed and informative, thank you!
You are the best I could find on youtube who explains car maintenance and tuning. Big thumbs up. And I am wondering will all your videos be with miatas? :D
+VtecasTV I might do other things in the future, but for now it's my main focus. I keep telling my girlfriend she needs to do a channel for all the BMW repairs she does!
Hahaha :DDD
Thanks... great information! Also, your presentation style is engaging and effective; if your primary employment is not teaching or training, it should be.
Big fan man keep it up, you helped me choose to buy a miata and love the how to's definitely would like to see the head gasket job if it comes to that!
+Ryan Boyle I'll be filming it in about 2 weeks. I have one more event next Friday that I want to get out of this head, and my other head will be ready to swap by then.
Greg has gotten more handsome with age. Thanks dad
I really appreciate your videos they're so helpful and I learn something new watching them :) thank you :D
+Edgar Navarro Awesome man glad to hear it!
:)
Fantastic tutorial, very well done!
I'd like to put a rush order in on a coilover install vid. Just got mine yesterday and am hoping to do the install over Thanksgiving!
+Fernando Ma If everything goes according to plan, the coilover install (2 video series) should be out right before Thanksgiving. Doing my best... I've got a head to replace on the turbo car and a timing belt job to do on Broke & Boosted before I can do coilovers!!
Yes this is an old video that I am commenting on but it was new to me today so...One thing you didn't mention is to blow some compressed air into spark plug area before removing spark plugs to blow out any debris that might be in there. A lot of time I will do this again after I have broke the plugs loose.
water belt timing pump video is going to help me here soon. lol
Another great video man!
Very good tutorial
Fantastic video!
Thank you
Hey brother. Thank you for all the amazing videos. Very informational and on point. I just aquired an 1990 na miata. Just hit 90k miles and did the compression test. All cylinders are the same with first pull @60 psi dry max @150 psi and wet max @180 psi. I live in Mass and will be putting it away for winter. In spring i was planing on installing FM turbo kit. I read per mazda manual that 135 psi is min for compression test and 192psi is ferfect for new engines. What do you think about my numbers? Thanks.
Greg, are TSI's any good? I heard that, when the lights are down, most of the air flow is blocked by them!
+David Texugo Very possible, I just think they look cool, haha.
Great Job! I'd really be interested in seeing your valve seal replacement diagnosis and replacement. (I think my car is doing that).
+Jo Ro Well I replaced my seals a few months back, and the smoking is back again which usually indicates a problem with a valve stem or valve guide. I'm just hoping I can actually find the problem when I pull the head.
That's good feedback too. I'd be interested in what you find out. I'm sorta having the same issues.
Awesome video dude! cant wait for more of the broke and boosted stuff.
Very helpful video, thank you!
Yes a head gasket video would be amazing :DDDDDDD
Great video! I need to do compression test on an '03 Expedition V8. I was told to disable the ignition sys. to avoid unnecessary spark that could damage the computer; is that correct? If so, is it as simple as just disconnecting the electrical connector to each ignition coil, and can I take the spark plugs off one cylinder head at a time?
I know that I'm going off topic, but is your Miata equip with a LSD? If not, would you ever consider Def swap with the 1.8 Miata's Torsen def? I heard that it is a great upgrade for Boosted Miata especially the 1.6 Miata's. Anyway I think that would be a cool video to do. Keep up the great work.
+boaz ovilma The car came with the 1.6 LSD, but knowing they can explode at 200+whp I swapped it out for a Torsen from a 2002, the 3.9 gearing is also far better than the 4.3.
you'll get a million views with that title for sure !
had to do a compression test a few months back after the turbo install on my scion tc because it was running weird, glad all cylinders came out good! but pulled the turbo kit off a couple weeks ago because guess what? I'm going miata soon 😏
+laith almasarweh Sick! You'll love the RWD life.
+TheCarPassionChannel I steal my buddy's miata every once in a while and I love it honestly lol and when I get one, its definitely going boost, just like the tC did! it'll make less power, but I know it'll be faster and more fun for sure
+laith almasarweh What kind of power was the tC putting down?
+TheCarPassionChannel it made 310whp at 11psi with a stock motor! my Injectors were maxed so I bought some 1000cc Injector Dynamics that I never ended up using. Called them today and they confirmed that it will fit a 95 miata (the one I have my eyes on) so that's a plus! also have tial EWG, HKS BOV, gauges and all that I'm keeping so that should help when I go turbo on the miata. Idk if I'm going to keep my turbonetics turbo or sell it and get a Garrett, haven't decided yet lol
Thank you very much very instructive.
Can you do a video on how to supercharge the Miata?
Keep it up I really like your channel. Hello from Paris ..
+mousse34 Maybe far in the future after I finish the budget turbo build!
Fuck I love these videos.
Very smart dude. Very logical, hard to find.
what about a cylinder leak down test? I wouldn't mind seeing something like that if possible
+antuan melkoun Same exact thing except you introduce 100psi into the cylinder with a compressor, and you're using the leakdown gauge instead.
How to re-build you head. Port and Polish, upgraded springs and valves, taller cam...that would be a great video!
+Austin Grubbs I can do everything but the porting, that's a science man! I'm going a little bit of combustion chamber work to the head that I'm installing on my car but I don't feel comfortable doing much more. I can definitely do a head assembly video though.
Hi there , you should have said to avoid battery drainage we need to use a Battery charger connected
to the car's battery at all time to avoid this problem , isn't it true ? I did not see any battery charger connected
to your car's battery !
If you keep cranking the engine with a battery charger connected to the car's battery , the car's
battery would be totally drained ! then you have to tow the car man !
Would you explain please what do you mean by MAX !! ? you already done the first compressions
and then the wet test with adding oil ! so what that MAX stands for ? Is it the car's Specifications ?
Thanks ..
great video...
I have one cylinder at 100 PSI and the other 3 at 170. Leak down test showed leaking into the exhaust system. Are there are any other diagnostic tests I can do before pulling the head?
great work man! if you are pulling the head, are you installing head studs?
+FPAUTO Considering it. Definitely going with a Cometic head gasket.
Just found this channel, deffo earned a sub from me mate, class content! Respect from England.
+Wils Thanks man!
yes... do a diy headgasket replacement vid plz
+larbag100 That's a guarantee, I've already got a spare head for my car, just need to get it machined so I can swap it over ASAP!
Good day, I just did a compression test got 150, 155, 160 and 180. Engine was not hot, nor did I disconnect ignition plug. Is this good?
Keep the videos coming! Great information in this video about how to properly perform a compression test. Just curious, what are you going to school for? Mechanical Engineering perhaps?
+Jesse Crane I would love to go to school for mechanical engineering if I could afford it. I'm not in full time school, just taking a class for engine overhaul/rebuilding this semester. I've never built a car engine before and I've always wanted to.
+TheCarPassionChannel ,I would suggest you seriously take a look into it. I am a mechanical engineer myself (been out of school for about 10 years now), and there is no better profession for a gear head in my opinion. You seem to have a good head on your shoulders from what I can tell from your videos, and I have faith that you will do well in whatever endeavor you choose. The key is to do something you love, and you will never work a day of your life.
I am looking forward to your timing belt and water pump video as I plan on doing that soon to my '95. Keep it up!
Jesse Crane Hopefully I'll get to someday, That's what I've wanted to do pretty much since middle school. Things happen and time starts to slip away and then you go "What happened?? I could have graduated by now!" haha.
+TheCarPassionChannel It is never too late to invest in your education. I personally had issues trying to get through my undergrad because I hated working 40+ hours a week to pay for school and not being able to afford the car parts that I was lusting over. I am sure glad that I finished school though, as now I have a good job and can afford to play with car parts without racking up credit card debt. School tuition has changed in the past ten years now, and college seems to be something that puts people in $100K+ of debt by the time they get out. I am not sure how Cali state schools are for tuition, but usually a state school will provide you the best bang for the buck...and you still get a good degree at the end.
I am looking forward to your progress on "broke and boosted", as I will probably be using it as a guide for when I go FI on my '95. It would also be great if you could keep us NA8 owners in mind when doing the modifications, as I am unsure what is common between the NA6 and NA8.
Jesse Crane Absolutely agree. I'm still hoping to get there someday. And I try to mention the 1.8L differences where possible, I'm sure I miss things because I've never owned a 1.8 car. They are quite similar though.
you are helping be boost my miata so hopefully you will be done by summer I been waiting to Rebuild my turbo untill you rebuild yours
+that neon channel I'm hoping to finish the initial build on Broke & Boosted by January or so.
I'd just like to have a lil help threw process I know mostly what to do just never boosted a car before that wasn't already boosted my only boost car I have is a 95 srt4 swapped Neon...miatas going to be so fun when boosted
I rather have more videos than that extra hour of sleep. Screw daylight savings time
+JasonSleiman4thewin Hahaha that's what I'm saying! I'm trying to get a light setup in my garage so I can shoot at night!
great video. makes me want to get a miata again
great video been waiting for one thought you quit on us lol jk people are busy I get it
nice video!!
Like red cars much? Lol. Thanks for the video very informative
So what does it mean then? Oil from PCV or oil from turbo?
thanks for the video, this is new to me, i'll try it on toyota 2nz-fe engine but how much pressure reading should i expect, i know that the compression ratio for such engine is 10.5:1?
I'm not sure off hand, each engine is a little different but the info should be available online or in a service manual. Probably 190-200psi on a 10.5 engine, and all cylinders within 10% of each other
Head Gasket video!!! I don't think there's one decent miata head gasket video out there!
+Reef Raf Well I have to remove my head so it's definitely in the near future.
Awesome, I'm looking for a Miata! Now as with all cars im looking for fairly decently low miles... But, what's the top amount of miles would you say the engine will last without rebuild?
Probably 200k... Mine has 156k and it's pretty strong still
+ThatGuyNamedScott. C I'm at 206,000 miles with plenty of boost and track time and this thing is still going. I've seen them go over 250,000 miles and still run pretty well.
TheCarPassionChannel ***** thanks for the replys, I'll probably have a look at higher mirage ones now too!
So my spark plug blew out and took all the threading with it, maybe you could do a vid on that? I heard its pretty common. I have a 96 na miata and was wondering what spark plugs/wires i should get? thanks :D
+Zachary Longhurst I'm not sure if that can be repaired with the head on the engine safely.... you might have to remove it. The best wires are NGK Blues or Magnecores, and I always use the basic NGK plugs, you'll want a 6 heat range if you're n/a or a 7 heat range if you're turbo/supercharged.
another great video dude, i do have a question for you. on a stock na 1.6, when the engine is idling and you stomp the gas, is it normal for the engine to lag (bog down a little) for a split second? engine isnt smokey and doesnt seem to have any troubles elsewhere? it seems like its running too rich until the revs increase. normal?
+Luke Burnard Yeah it's pretty normal, at least from the cars I've driven.
If I turbo my Miata, will it still pass smog or no?
Hey man trying to find my ignition plug to do a compression test I have a 2003 nb any advice for finding it?
mine read 40-50 psi when first cranks
all cylinders and max on all was from 155 to 170 whats wrong with my engine (note i AM burning oil from somewhere) about 1 liter per 4300 kilometers
Is there a video on your msd setup
what do you think about putting rotella t6 in a stock 1.8 I heard it's really good and cleans out the motor?
+Carlos Coto I've been running T6 for around 20,000 miles. I'm no oil scientist so I can't tell you any positive or negative effects it might have on the engine, but my car is still running strong and it's over 206,000 miles.
Yes, head gasket video please.
what kinda rims are you running the white ones?
Does your car burn any oil? Been dealing with high oil consumption for the last two years. My 1.8 nb2 has 180-175-175-180 on the cylinders. no. 2 & 3 both have a pressure loss of 2% & 5% accordingly. No sign of smoke though. Been using 5w-40 castrol for a 1000 miles now with no sign of burning. I'm keeping track on the dipstick on a weekly basis. I'm thinking head gasket because I had overheating events at the track a few years ago before I started taking care of cooling. I'd definitely like to see what's wrong with your car.
+yossi126 Does my car burn oil? Did you see the clip at 0:30? Lol. I'm thinking I have a problem with a valve guide/valve on mine. 2-5% is pretty healthy for a leakdown test isn't it? Also check out your PCV, you can get a little oil though that too. Otherwise I would suspect valve stem seals if you haven't replaced them yet.
+TheCarPassionChannel pcv was replaced so it couldn't be it. I also suspect the valve stem seals
yossi126 I have a writeup for replacing them with the head still on the car if you plan on doing that.
+TheCarPassionChannel Do share!
yossi126 www.miataturbo.net/general-miata-chat-9/how-change-valve-stem-seals-head-82278/
Hey Greg,
Unfortunatly i cant loosen the sparkplug next to the firewall.
It sits there really tight and i dont want to break something.
Itried loosening it with wd40 but it didnt work?.
I kinda want to change the plugs but i dont want to break the plug and get the head fixed at a shop?
Any advice?
Use liquid tortch,and and crank on it.don't worry about breaking the spark plug.there is a broken spark plug extraction tool you should be able to rent if it dose break.
Thumbs up! Subscribe! Best way to thank him.
hate it for your engine but would definitely like to see a gasket vid
+Temper X21 It's all good, I have a lightly modified head I've been waiting for a good reason to install so now's my chance.
+TheCarPassionChannel hi Greg, I wasn't able to find the video of you replacing the head gasket, so I'm assuming you haven't done one.. I have a few questions for you, how can I communicate with you that isn't through these comments?
I have not done it yet. e-mail me thecarpassionchannel at gmail dot com
RENT FOR FREE... LUV IT
I use the wires to pull those pesky spark plugs out, the spark plugs sockets always leave me very disappointed because the rubber never holds good enough
Un-TY-Told use a magnet
Hi, If I use a remote starter (hooked to the starter coil) Do I still have to disconnect the gas pump and the ignition?
+dana miller Hmmm, I'm not sure actually, I don't think so? But it's only a single fuse to pull for the fuel pump, wouldn't hurt to be safe.
TheCarPassionChannel Thank you
I think my engines is toast:
1: 120 2:70 3:70 4:120
Wet 1:150 2:90 3:90 4:150
Does that mean I have bad rings and a bad head gasket?
Datsun comperection test pls
please do a head gasket replacement video
+J. Torres Already have all the parts and a spare head, thinking about doing it in a few weeks.
cyl # first. dry. wet
1. 65. 130. 200
2. 60. 110. 175
3. 65. 130. 190
4. 75. 155. 200
Just did this to check the sellers numbers and this is what I got. I'm afraid to turbo the car now.
Travis Von Elling 130's is with the engine fully warmed up and throttle open?
front to back
1. 180/90
2. 160/70
3. 190/110
4. 185/90
good ?
+the WHITEBOY Solid!! Ready for boost.
+TheCarPassionChannel hells yeah
How would I disable the ignition on a 2002 miata?
+PaperFc Those are COP right? I would think unplugging all of the coil packs and setting them aside should be fine.
What type of schooling are you doing? if you don't mind me asking...
+Joshowen Not really going for anything, just taking an engine overhaul class this semester. I've never built a car engine before and I've always wanted to.
Nice!
First pump should be 70% of final numbers
your the fucking man Greg
FM gasket and arp studs????
+zombieassasain1 Cometic head gasket for sure, more than likely will do head studs but not sure yet.
Quick question what if I did the test but it never held the psi? It would always slowly go down?
+Boris Mitin Then you have a bad tester, haha. There's a valve in the tester that's supposed to hold the pressure inside the gauge. If you went to test your cylinders for leakage, that's called a "leak down test" and you need different tools. (Air compressor and a leak down tester.)
Thanks! appreciate it! Btw awesome channel, looking forward to boosting my 1990 miata!
what coils are you on?
+Nihal Farooq Powertrix, I'll be elaborating about them over a 2-video mini series this month.
Hi I am in the market for a s13 silvia. I have found one with about 210,000kms which is about 130,000 miles. It has a ka24de. Would you reckon the owner let me do a compression test on it if I had a look at it? Also my dad doesn't want me to get a car with other 200,000kms so if anyone with knowledge about these engines please reply to me
If the owner will let you compression test it, it's always a good idea because it can help you spot a potential problem that you might not know about otherwise.
What would I need to probably do if I did buy the car with higher milage that I want to keep in good condition
AidosHD Pretty much just replace things that wear out, pretty much anything made of rubber. Hoses, lines, plug wires, gaskets, etc!
I hate v8 engines when doing compression test already and i havent done it yet.... I gatta do a compression test on a GMC Sierra 1998 5.7L, is it the same process ?
If that motor goes, please please please swap to a 1.8L. You will love it so much more. They are miles better to boost
+xampx2k7 It's a solid possibility. But first, show me a 1.8L with a better torque curve than mine! Over 200lb-ft of torque from 3450 to 6600RPM :) Not saying the 1.6L is better, because I know it's not. Just saying a properly set up 1.6L is better than a poorly set up 1.8L!
+TheCarPassionChannel Okay, Here's one :) www.miataturbo.net/dynos-timesheets-21/99-miata-8psi-garrett-gt2554r-223whp-247wtq-61388/ It's a GT2554R on pump gas. I agree about the properly setup bit, but an equally setup 1.6L vs. 1.8L and the 1.8L will be superior in every way imaginable except maybe fuel consumption. I got my 1.8L motor last week with 73K for $899 shipped so it's not too expensive either. Just give it some thought, it would make a couple hella good videos.
xampx2k7 Read the replies, that's not a credible dyno plot.
xampx2k7 Also, no way he's making 247wtq @ 3300RPM @ 8psi. Show my a DynoJet result and I'll be a believer.
TheCarPassionChannel Eh it's a weird plot no doubt, but I've seen them like that before. Our chassis Dyno at work does something similar. Anyways, give it some consideration because torque curve aside you can make more power, with much better spool-up and less chance to blow motors with a 1.8L. By the way, I actually got my 91' Miata partly because of your videos. When I get my build thread up I'll shoot you a link if you're interested.
what do you work at?
+shut up u idiot ダチ My regular job? Truck dispatcher and contracting project assistant; basically I orchestrate construction trucks, talk to customers on the phone, and do lots of paperwork.
TheCarPassionChannel nice
heyyy.. i use to have that car!!.. i smokeed it getting out of the bar, when i was drunk.... shee chick magnet l... sam colorr toooooo
glad the tash has gone :P
I did the compression test and my results were:
C1 - 90 - 120
C2 - 90 - 120
C3 - 60 - 100
C4 - 90 - 120
Wet
C1 - 90 - 150
C2 - 90 - 150
C3 - 90 - 150
C4 - 90 - 180
Pretty high miles?
+TheCarPassionChannel 131,000 kilometres
CCTreason Wow, those numbers are super low for such a fresh engine. That's PSI? Was the engine warmed up? Throttle open?
+TheCarPassionChannel Yep! I've got a funny feeling that it's had a heart transplant at some point now lol. It's got a pretty dear oil leak also, can't seem to find it :/
999th like 😮
RIP Juice WRLD