LEAKDOWN results
 

my butt hurts a little after seeing my results. I knew #2 wasnt going to be good when i saw a bit of oil on the spark plug.

looks like i will need to start sourcing a motor and stay out of boost.

#1 35%
#2 72%
#3 25%
#4 25-30% didnt take pic since it was same

https://www.miataturbo.net/attachmen...ine=1352234421
https://www.miataturbo.net/attachmen...ine=1352234421
https://www.miataturbo.net/attachmen...ine=1352234421

What aren't you pushing in 100psi?

or at least more than 10psi.


My compressor isnt the greatest, so I stopped at 75psi....but with 75psi in, I'm holding 65psi.

so about 14% leakdown.


https://www.miataturbo.net/attachmen...ine=1352235005

i followed these instructions.

wtf. Do not like.

my results or instructions?

both.

yikes

old girl is tired

Ya, you need more than 10psi to get the rings to "seat". (rings seat not by spring tension, but by combustion gases pushing on the inside of the rings) The ideal pressure is dependent on the orifice size in the tester. I use one from speedway motorsLink. If you open the instructions it says that you MUST exceed 80PSI. I left my compressor on it's normal 90psi, and wrote down all the raw numbers, and did the math later. Sorry, but your test was invalid. Jack the pressure back up, and try again.



That being said, I expect your #3 numbers to be far from ideal since it's not anywhere close to the other cylinders.

There is no way to raise the pressure on this gauge. I need to find someone that has a different gauge to at least compare.

Interesting. You're feeding it 90psi air and the left gauge is showing 10?

yea my compressor fills to 100psi. its just the way this harbor freight shit works i guess.

return it and get one that works.

I guess I dont understand how this gauge works, but I dont like it.

You should be feeding the clyinder X amount of pressure, this will show up on the left gauge.

The amount of pressure that actually holds in the clyinder should display on the right gauge.

The pressure regulator on the unit should control to totaly amount of air that can pass through. Are you saying that it maxes at 10psi when you open the regulator up?

What I assume is that the regulator is limited at 10psi, the left gauge is a 100psi gauge, and the right gauge is actually a 10psi gauge. I dont like this gauge at all, because it indicates 75% leakdown with no pressure present. That should be "100%", I have a feeling that gauge reads vacuum as well. Anyways, this gauge is silly and makes it hard to read your actual leakdown...you really need at least 50psi in the clyinder to get a good reading, ideally 100psi and then you do your own math.

Its a friend's, maybe i need better friends...

we all do.

Matco probably makes the best tester on the market. It's a little pricey at 125 bucks but it works.