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Final preparation for assembly on our 4.6L Jeep XJ engine
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- čas přidán 6. 08. 2024
- The Jeep is getting closer and closer to running again. This week Davin makes a few changes off of the back of our compression ratio discussion and proceeds to get everything cleaned up and ready for assembly. These types of weeks don't always feel like the most progress, but they are important to getting the project done right. So, stay tuned because this bad boy is going to be on the road again sooner than we can imagine.
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In a future series, would you and the engine shop mind explaining more in depth about the machining. We see a lot about mass production with CNC, but little about what it takes to set up to deck a block 90° to the bore, or line bore, or regrind a crank to make a stroker.
They didn’t grind the crankshaft to make it a stroker. That’s one of the amazing things with these in-line Jeep engine’s. You take the old crank from a 4.2 and it’s a stock part that is probably one of the most expensive parts in the stroker ‘’kit’’. For decking the block it all depends on what machine they have for a surfaces. I’m assuming they have something with a cutting blade and got away from a grinding stone. Also what the machine has for a mounting system. The old one my dad has is just a flat surface that you bolt stuff down to. For cylinder heads he has a “fence” that has a cam bolt in it. But for the blocks we just shimmed it till it close as possible to straight, then cut. We didn’t do a lot blocks. Mostly we did Diesel engines. And most of those used liners, which would change a lot of things.
Your attention to detail is amazing. Your are a Master, stop justifying yourself to the naysayers! Thanks for sharing!
I cannot get enough of the rebuild content, plus all of the great information/general knowledge keep it up. Maybe longer videos? Wouldn't hurt :)
The music you guys choose for these is always so pleasant. The audio experience is always great.
This video brings up a good point, on Missing things. This is very easy, especially with home weekend projects. The start and stopping, long periods of time between. We are human and Will forget.
I appreciate your math lesson. From my experience, when you use those formulas in real life you always use the fastest method. Time is money, no need for added conversions. I work in construction so we always set radius points so we can set a center point and pull a string line.
You're a smart man Davin. In my opinion Math is everything. You know your stuff. You applied it to the job absolutely correctly. It was good that you mentioned the whole radius and diameter thing....gotta keep'm straight. Great episode. You could have titled this one "It's all in the numbers"
Love that they left the chatter in at the beginning. It was good to meet Davin at Autorama.
Davin, this was a really great episode! Your main cap trick was shown to me by an old machinist in the late 70's (learned his craft in the US Navy) we all used when I was growing up. All of us thought it was sacrilege to do such a thing...then he explained that not all bearings are the same. He used a little Dykem on the cap flats and lightly touched them up as you did - Voila!
Davin likes that drive over to the machine shop.
Having an align bore or an align hone would be a good lesson to the viewers. It is interesting every time one of these projects has something go wrong, and you show another method of how it is corrected.
Sometimes when you order a reground crank from an auto parts store, it comes with bearings that match the undersize. However, who knows what manufacturer and quality of bearing you will get? Maybe if the crank came with some mystery brand of bearings, it would be wise to buy some bearings from someone with a good reputation in the Jeep community. Clevite is a popular choice.
Just thought i would throw this out there. There's this fellow out there that rebuilds the 4.0 as a high performance engine. He's getting some decent numbers too.
Thought it would be polite to put in some links, but only if it's ok with Hagerty.
Loving the series, very satisfying to see it coming along!
Outstanding! I appreciate you showing all of this, especially the things you find concerning along with the things you forget. Helps me feel less anxious about my own build I'm working on right now.
He calls them spectacles. He's alright... and smart.
Great videos. Kind of a shame this is all for a beat az XJ 😂. We can tell that you genuinely like to tinker and I resonate with that vibe in these videos. Definitely a refreshing change to the death metal and blistering pace of the typical video. “Ok we’re back from the commercial, and while we were gone we just went ahead and got the motor in, got the car back from paint, and had it upholstered quick… now let’s talk for 5 min about our masking tape sponsor” 👌
Davin, on a related subject I recently learned the correct formula for figuring engine displacement which is: Displacement = π/4 × b2 × s × c. Where b is equal to the bore size squared, s is equal to the stroke length, and c is the number of cylinders. When I tried this formula to figure the displacement of my Chrysler Pentastar engine it did come out correct unlike my earlier wrong math.
Interestingly you've used the diameter of the bore and divided pie by 4. I've always used the radius squared times pie times the stroke.
PEMDAS
Yall paid more attention in class than i did i guess lol.
Here’s another formula for engine displacement that’s a little simpler. Diameter squared x .7854 x stroke length x number of cylinders.
.7854 is a constant that can be used for any size bore.
A full parts list would be be great, please consider it.
He’s also checking it on a table. I’ve always heard it’s best to measure and assemble the bottom end of straight 6’s or even old school straight 8 on a table or flat surface, not hanging from one end.
True. No metal is a true solid and static. Hanging from one end is applying torque to the shape of the block and the iron is moving ever so imperceptibly. But it IS moving.
Wow I feel like a prehistoric primal cave man, I have so primitive tool, love the ugaduga machine.
I love honest people who recognize mistakes. Keep up the good work!
I am not one of the ones who was confused by your math. But in my head, I always have radius because I remember everything from high school geometry. I just don't have any room left for new information. 😆
wow what a great opening to the video 😂
First time watcher, really impressed. I'd agree that explaining more about Math can actually deepen the insight on machining. Keep up the good work!
I'd rather paint the block first like you did so its clean and I don't deal with flash rust on the outer surfaces and then scuff and reshoot it after finally assy to get the inevitable defects from assembly. But mask the brass core plugs off, always. That's classy, folks.
Hi shout-out from Philippines , I am fans of your channel 🔥 keep making amazing awesome rebuild sir 😎
Best on CZcams… keeping it real but thorough. Thank you!
This is a family show. He's always talking about relatives. Lol
8:44 HOLY HORSE APPLES FLATMAN... You SPED-UP THE TIME LAPSE.! 10:21 A new Short video game record.
when one looks at the seven main caps on a 225 crank you can truly say. it has better support than your grand dads suspenders/belt duo...
(7) mains....y'all saw that, right?
Tell ya what, that bazillion-years old AMC inline is one tough hombre'.
*Question Davin:*
Why would one not look at perhaps getting a different set of bearings if the ones you have
are so inaccurate in thickness across them?
- Ed on the Ridge
I love his last line to get out in the shop, I’m just about to to put a new subframe on so davin I’m way ahead of you!!!! Lol now all it is is time to get everything parts and all.
Great job! Thanks for sharing.
Good show! Probably a free case of Dawn on the way. And Happy 🥧 Day!
Why not get another set of main bearings to get your desired clearances? Mix and match the bearing shells until you get the spec right.
How appropriate is it that you would post this video on the day of Pi (3.14)?
Good stuff - and to celebrate, I am having some apple pie for dessert 😁🥧
Kewl video! Thanks!
Nice use of pi at pi day.
I like this guy.
Am I the only one waiting to see what golf clubs he picked up during the montage? Lol
Thank you for explaining the formula you used to figure the area of a circle useing diameter. Btw, not sure if the pun was intended but happy Pi day!
Great videos, thanks! I was really tracking the Snowball '37, can you give us an update on that?
*DROOLS* Did I see a Van Norman boring bar in that machine shop?
8 relative's 🤣... I am cracking up
When you mentioned the bearing was out of round, then the machine shop confirmed it was round and the possible cause was inconsistencies in the bearing. Why not order a new set, different brand etc?
I’m in no way of telling anyone what to do in their field, just curious.
And , as Paul from fab rats would say , a good eyechrometer helps , too
You're not short, you're vertically challenged!
Main caps and rod caps are SUPPOSED to be egg shaped at the parting line. Machine shops know this, which is why they machine the caps the way they do. Stop and think about what happens inside the engine, especially as the RPMs go up. The crank is going to try to come out of the block, if it can. As it does, the main caps will stretch a bit, and the main caps will pinch in right at the parting line because the crank is trying to come out. The main cap is a U shape, and as the bolts stretch from the force of the crank, the bottom of the U is going to bend at the center and the caps are going to pinch in at the parting line. If your mains are a perfect round shape when sitting on the bench, they are going to be an oval shape under rpm, and again - they are going to pinch in right at the block/main cap junction line - which will cause the crank to be scored and the bearings damaged. If the machine shop machines in an egg shape at the parting line, the main bore will tend to become round as the rpms go up and prevents the bearing from pinching the crankshaft. In addition, the egg shape of your main bore will help the bearings stay in place and keep them from spinning. It also prevents the main caps from fretting on the block. Again, this is a completely normal practice to make the mains and the rods slightly egg shaped - so that your engine will last more than 5 minutes.
Hey daven, ken here from GUELPH ONTARIO, CANADA, about 1.5hrs west of Toronto Ontario Canada, its +5° up here today,my question is...when are you going to finish up that vintage race car, the last thing I saw getting done was putting the axles, trany back together, and I think was October'ish...November 'ish...or sooner, or I'm WAY OFF the calendar. Get out there and getter done!...lol and where abouts are you located,
I'd rather divide the diameter by two and carry on than try to remember another formula, even though we all know that pi are round, cornbread are square....
@7:18 isn't there a hairline crack to the left of the hole you are cleaning? it looks like it goes on both sides of that center valley on the left also.
Random question. In this episode you talk about the main clearance being .003 and you were going to sand the main caps to tighten them up.
Is that something that can be done with connecting rods as well?
I'm building my own 4.0 and I'm finding the rod bearing clearance is just a shade loose (about .0003")
Does taking material of the block affect the clearance of the pushrods to the camshaft and lifters? How do you compensate for this?
Snowball's ride get shoved in the back corner?
In the past, I've decked the block to make it flat, and for compression I've shaved the heads. Is there an advantage to going for compression by shaving the block?
Now that the deck height has been lowered, is there concern for valve clearance? Will you mock up a putty test to know for sure?
Cheers
No. Non interference.
That term does not apply to this engine. Yes you could hit pistins on valves with the wrong cam.
Iam sure this guy will figure it out.
👏
That thing got a big cam in it?
Nope but it's a long one!
Yes I'm tu.
Where'd you guys source a carbide burr that long ???
I noticed the 50 Chevy P.U. looked like it was sitting crooked in the backend. Optical illusion or leaf spring issues?
Optical illusion! Gets us every time, too. The pickup bed and bumper were almost completely rotted off the truck. Davin did his best with a quick and dirty repair and reinforcement of everything. But yeah, it does look crooked going down the road, but the frame and suspension are straight!
Did anybody notice the two cracks by the oil ports?
looked CLOSELY those are casting lap marks as one that worked in the foundry industry and worked on those castings there are a lot of problems but that one was not one of them the Lap mark comes about where the metal (in this case iron) was not pored at a the temperature as called for and the metal dose not bridge a gap
😎👍
On an unrelated topic, who does vapor blasting in the Traverse City, Michigan area? I have a 1984 Honda XL350R engine case i need to have blasted. Any help would be appreciated.
Anyone with experience in working with metal knows that the process 99% of the time doesn't go 1. 2. 3. 4.. It goes: 331243121122321323 lol.
😂
Blueprinting an engine like this definitely makes a difference in horsepower and reliability. The OEMs, especially the American manufacturers, would just have the worse tolerances that wouldn't be found on Japanese engines.
haha big block go brrr.... I feel like thats completely true. USDM motors tend to be a little looser in tolerance, but (in the case of the AMC 242) run for incredibly long periods of time, with little (or even no) maintenance at all.
Funny, as the only engine I ever had fail prematurely (for me anything less than 100,000 miles is a premature failure) was in a 1984 Honda Accord. The cam and rocker arms mutually consumed each other at 72,000 miles. The dealer said “pound salt” as the warranty then was only 36,000 miles. I complained to Honda and they sent me a letter suggesting I hadn’t maintained the engine properly. I keep a lot book for all of my vehicles that shows not only all maintenance and repairs, but I log every gas purchase. I sent them a copy of the 16 or so pages in my log book by then along with receipts for the Mobil 1 oil and genuine Honda oil filters and their second letter said that warranty was denied as 72,000 miles was within what Honda considered “normal tolerance for engine life.” I haven’t bought a Honda since then. I’ve never had an American, German (two Beetles) or Korean (Sonata) car have an engine failure, let alone one at less than 100,000 miles. I maintain my vehicles impeccably and the Accord engine was simply defective and Honda would not stand behind it. Their loss as I liked the car otherwise and probably at least half of the dozen or so vehicles I have bought in the last 38 years would have been Honda’s had they stood behind their defective product.
@@LTVoyager There is a reason why every top end of a honda is gone at the scrap yard lol.
@@CanadaBud23 I have no idea as I’ve never looked for Honda parts in a scrap yard. I suspect I just had a Friday afternoon engine and, well, crap happens. What torqued me wasn’t the engine failure per se, but the cavalier and accusatory attitude of Honda the company (well, the American division at least). That completely turned me off to anything with Honda on it, motorcycle, lawnmower, etc. My Kawasaki engined John Deere’s have held up fantastically for decades as have my Kawasaki and BMW motorcycles.
@@LTVoyager A single data point isn't enough to justify boycott a specific brand. Even within brands, and model years, you will have specific issues. I don't know about the 1984 Honda Accord you had but I specifically remember my shop teacher telling us that the Japanese cars that came in the 80s were more reliable than their US counterparts. They had brand new American made models leaking in the dealership. Engine builders who are used to working on Chevys are surprised that Honda engines don't need to have their threads chased with a tap and how much power the stock bottom end takes. I've had several Hondas and aside from burning oil at higher mileage due to high rpm operation, they are well built. The B and K series takes abuse all day everyday.
If at first you don't succeed, improvise. 😁
I wonder how hard it would be to weld on two more cilenders to make a inline 8
Very
It's *cylinder*. Your daily Rock English tip brought to you by Phizer.
not a problem the Crank would have to be stiffer and then the balance would be a problem if one has that worked out and has the MONEY it could be done
Did my onr count how many times relative was used?
The count is eight! Relative to his other videos, that's relatively high. :-)
Hi
hi
Semper Gumby 😂
And young people, pay attention in math class … you will use it some day. 😁
Relative to the relative relative....please relative and relative the relative, relative??
Please please please remove the flashing on that crank....its driving me crazy
DUDE you almost gave me a heart attack micing that crank and working around it while it is standing on it's flange ONLY. That is a catastrophe waiting to happen with the crank accidentally bumped and falling onto the floor.
It's sad to even think about that soon we will see ICE in the museums. Someone please invent hydrogen or whatever there is a bit more complex and having at least some soul. We don't want to use same electricity plug to charge our mobile phone and car..
People are working on it. I'd love to fill the tank with hydrogen instead of fuel or electrons.
@@CanadaBud23 Angry pixies sounds cool but don't shoot fire out the exhaust and feed trees.
The idea and possibilities of electric cars are awesome. Low center of gravity, maximum torque available at any rpm, quiet, simple, less moving parts less things to fail. First problem is we don't have battery technology that's suitable for vehicles - fast charging, safe and easy recyclable.
Second problem is that cars nowadays are not designed by engineers but by accountants and marketing divisions. There is no technological race for best car anymore. Instead all most inhumane and anti-user big corporate practices are being implemented in EVs:
- nothing is user serviceable
- battery is not replaceable
- batteries will most likely in near future be rented not owned, so good bye selling your car to let's say other country (not much issue in USA I guess but in Europe it's quite common)
- per design fixing anything costs so much it's better to scrap it (there was a story about Jaguar I believe that had puncture in floor that normally would be patched and done, but because battery is glued to the floor - replacing is not financially feasible - $40K, yes fourty thousands of american dollars)
- everything is software, and everything has to be connected to the internet allowing company to change properties of your car whether you want it or not
- subscription based features
- charging can be externally limited, even at your own home (I believe in UK there's legislation going on right now for government to be able to restrict car charging if grid is loaded)
Th Big Problem WHERE IS THE POWER COMING FROM the Grid is not ABLE to provide all that power Can you say rachaning may be we are no where near to providing the power needed to operate the car as we know to today
the electric car in every ones home is a Pipe dream of the Miss informed and the Government that wishes more control over the POPULOUS
@@tihspidtherekciltilc5469 Maybe look at Jesse James hydrogen 572 BBC
Dawn gets grease out of your hair.....
all you gear heads learn algebra, and learn calculus. Its your civic duty.
UKRAINE NEEDS HELP! UKRAINE IS PROTECTING OUR FREEDOM! UKRAINE IS BLEEDING!
Maybe NATO shouldn't have made a deal and reneged. Then there's the US culpability. I wonder if those Germans are still laughing at Trump.
Not my problem
I've said it before and I'll say it again, rebuilding this dinosaur engine that will make 180 HP max makes zero sense. It is just going to consume tons of fuel and will only get half decent torque. Should have sent the entire car and engine to the scrap yard.
I think you might be missing the point of this series.
@@Hagerty The Rock Auto sponsorship?
@@brarautorepairs no, just look the first 3 minutes of the first video of this series and Davin will tell you 😉