$10 Tachometer Review
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- čas přidán 7. 09. 2013
- This digital tachometer sells for around $10 and is good for tuning up engines that don't come with tachometers. This cheap tachometer is great to use for tuneups, or you can install this cheap tachometer permanently. It also has an hour meter.
Here's where you can buy one of these cheap tachometers:
amzn.to/30Bvjqm - Věda a technologie
That is referring to two and four stroke engines how many stroke sparks per cycle
Hi Hoobs, Another cool video, As you say functional rather than pretty but the dogs danglers for setting up. Did you have to wind the wire in tight together form or spread along a length of the HT lead? Off to look on e bay now Cheers Dave from Northumbria.
It has to be wound around the spark plug wire. I don't think it needs to be too tight. If I were installing it permanently, it'd wrap it around 10 or 15 times and then duct tape it in place. Because it has an hour meter as well, I'm thinking of putting it on my motocross bike.
I bought the same tachometer , but i didn't received any manual for instructions, i have a kohler engine
S2 setting for small engines (Briggs, etc) as the plug fires EVERY TIME the piston comes to TDC and the magnet on the flywheel passes the coil. it is a dead fire since it is exhaust closing/intake opening crossover. no fuel being compresses so no fuel to fire. plug fires, nothing happens so it is firing EVERY TIME the piston comes up even on small engine 4 strokes... and 2 strokes, but get power out of 2 smokes when at TDC every time.
Nice!!!👍🏻
So, once per rev is for most 2-strokes. once per 2 rev is 4-strokes. Twice per rev is for something like the older SkiDoo 2-cyl where they use one coil for both plugs and essentially dry-fire the "other" cylinder.
how did you find out about the mistake in manual? did you compare it with other tachometers?
I just bought the same tach off Ebay for $10. Its not accurate. I ran it on my Harley with the factory tach and it was off by about 2 to 300 RPM. I had it idling at 900 RPM with the factory Harley tach and the cheapo was reading around 1100 to 1200 RPM. My factory tach is right on the mark. You get what you pay for.
Was that an ebay find?
How accurate is it? In all of the video's I have seen, it seems to jump around. Once its on for a minute or so, does it even out?
fairfield1987 There is a bit of a lag. If the engine is at a steady speed, it catches up and shows a steady reading, but if you're reving up and down, it isn't as good. I'd use it for setting idle speed, and things like that, but wouldn't hook it up permanently to use. You can buy generic electric tachometers with needle dials for cars and bike that work better, but they are more expensive.
Yes it is completely waste of money 😔😔i bought this
Hi mate thanks for the video. I just got the same one and can't work out how you turn it off. Any tips?
It stay on , very little power drain, much like a wrist watch.
Hold both buttons for 5 seconds to turn it off. Press S1 for 5 seconds to switch it back on.
how did you get anything to come on the display? Was it attached to a power source. Mine is always blank, even when I have wrapped it around a spark plug lead.
It has an internal battery. Maybe your battery is dead.
mine was dead too
@@jespermollerupjensen2351 Mine arrived dead too, I sawed the cover and found a soldered lithium battery inside. I guess it gets the charge when you wrap the wire around the spark plug. I will have to test it.
No. It's just a standard one time battery . You better get the other type of tacho which has a replacable battery.
@@ronenfe - it doesn't charge EVER. The lead has nothing to do with the power or charging. It's a button cell non-rechargeable battery inside.
Had one connected to generator lasted for a year about 1000 hr use
Mine didn't come with any instructions. What I'm wondering is if I can shorten the wire?
I’m sure you can. I don’t think there’s anything special about it, and making it shorter won’t change the way it transmits electricity.
I do not get the RPM modes.
1) What is the point of having a mode where the spark plug fires two times per every one revolution of the crankshaft, when no such engine exists (1:17)?
2) What is the correct mode for a two stroke engine such as a chain saw (two stroke engines fire once per revolution)?
3) What is the correct mode for a four stroke engine such as a car engine (four stroke engines fire once per 2 revolutions, when measured from a single spark plug, not the cable that goes from the coil to the distributor)?
I would like a definite answer from someone who has actually used this.
any magneto ignition will fire every revolution , even a points style ignition will fire every revolution , a four stroke engine fires even on the exaughst stroke and a two stroke fires the same way .. on modern cars the computer only lets it fire on the compression stroke on a four stroke car engine ,, it sounds confusing but its really simple
which mode for single cylinder 4 stroke engine?
mode 2
@@lordjaashin are you dump? In the manual it clearly say "03- every other revolution you have spark" in 4 stroke engine every other revolution you have spark. Dot.
Can you Cut the wire if it is too long?
Thanks for the Video!
Yes
yes
Thanks.. I trimmed my wire down and it works just fine!
I use mine to check the RPM on lawn equipment I soldered an alligator clip at the end and just clip it on the spark plug wire when I need to read RPMs and adjust it
$4 on ebay, works perfectly
if you have a single cylinder 2 stroke scooter/motor then mode 1 is correct
Thanks. That mode would work for most old Harleys as well, because they fire on every stroke.
hi there... what about setting for honda engine gx 390 4 stroke? thanks a lot
So the Harley is using a wasted spark ignition system where there is 1 coil sending spark to both cylinders?
Thats a good question since it uses a small CDI box .
Mode 2, spark once every revolution.
These are intended for small engine use, lawnmower, pressure washers, generators , dirt bikes ,mini bikes , motorized bicycles etc.
I just got one
I got it turn on and I don't know how it turns off
I think it’s just supposed to stay on all the time. Maybe you’re supposed to wire it to the ignition switch for power.
On my Tach if you press both buttons it powers down.
Which one you got?
what is the prise
It was $10 back when I made the video.
WTF?? Is there a different between a 4 stroke Harley Davidson and a 4 stroke car engine?
Yes. The Harley fires on compression and exhaust, but a car only fires on compression.
dead fire on exhaust closing/intake opening so nothing is happening, but the plug is firing anyway. same on small engines briggs, etc. the plug is firing but nothing is happening cuz no fuel/air compression on that stroke.
Their throw away's. Mine froze. Once it does that done deal. They seal it so you cant change the battery or re-set it and the battery is tacked on in their. Their okay, but don't expect it to last much longer than a year. My fathers froze too after he checked it on his outboard.
With that said I'm about to buy another one because I need a basic one to check my rpm's.
If you want one that will last to keep track of hours you gotta spend the money.
You are correct. That sums it up. It is a good thing to keep around to temporarily hook up to an engine that doesn’t have a tachometer when you are tuning it.
Mine allows the battery to be changed. They sell 3 models. “Normal” = battery CANNOT be changed, “Standard” = battery CAN be changed. Has no backlight, “Full-featured” = battery CAN be changed and HAS backlight. I know also that the Standard version keeps track of RPM and Hours.
totallyfrozen I gathered that when the next one I ordered for the same price as the old one, came with the option to allow you to remove the battery. Thats how they should make all of them. Regardless, they are little basic units that don't last forever and when they go bad you just buy another one. Good for checking rpm, would not rely on it for hours since if it breaks and you don't know what hour your at, not much you can do, or if the battery dies, resets, no memory, still screwed on hours. If you want one of these to keep track of hours I would go with the more reliable one, which costs more. For checking rpms, great at a good price, but are throw aways. Only other way is to check what hour you are at and replace the battery before it dies, write it down somewhere so you can keep track after you changed the battery. If the unit freezes like the old one, will taking the battery out reset the thing to start working again or is it still fried. TBD when it happens again.
If it resets than they have improved. If it stays frozen back to square one, tossing it and buying another one. Will see.
1:00 engrish intensifies
a four stroke engine will fire every revolution just like a two stroke will , a four stroke fires on the exaughst stroke to , even harley four strokes fire every revolution unless you use a single fire ignition but they dont sound as good
Four strokes using a distributor fire once for every two revolutions of the crank while four strokes with the points cam mounted on the crank will fire once per revolution.
Fuck it, I'm just gonna spend the money and get a REAL Tach........these seem like laggy junk.
Yes. Depending on what you’re putting it on, you can get a tachometer for 40 or $50 for your car or motorcycle that’s much better.
Amazon reviews say they are junk.
That says more about the users than the instrument itself
for $10 now on e bay... it is not that precise an instrument... should wrap it abt 5x around plug wire... set the S1 thing to the right RPM's. setting 2 for small engines that FIRE EVER TIME the piston comes up even 4 strokes as it is a dead fire on overlap of exhaust closing/intake opening. obviously if it idling.. it is NOT turning 4000 RPM unless got the idle set WAAAAAYYYYY TOOOO HIGH. so yes the instructioins are not correct on the S1 setting. S2 setting for small engines that the plug fires every time the piston comes up... same for 2 strokes too... so... S2 for small engines.
WRONG