JakZe

iTrader: (1)

Just did a test after breaking in my built motor, and this is what I got

Cold 8.6:1 CR test:
Cyl 1: 164
cyl 2: 163
cyl 3: 165
Cyl 4: 167

I gapped the top ring .0050, and bottom .0055.

This is a turbo build and looking around 15-20psi.

Is this fine? I'm not sure if changing the CR changes it much.

SpartanSV

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If that's not a typo you'll be pulling the engine apart.

You should have 3 to 4 times that amount

JakZe

iTrader: (1)

Oops I forgot to calculate the rest of it. Using 84mm pistons

Top ring is around 0.0167

bottom ring is around 0.0181

Warpspeed

Spartan is right, that is VERY tight ring gap.
Oops *edit* posted on top of you.

Those new gaps are more like it.

technicalninja

Those numbers look fine for a stock camshaft engine.
I believe the numbers you are looking for are .50mm and .55mm which would be .020" and .022" regarding ring gap. They are fine as well.
I would do the comp test hot as well...
Looks fine to me right now

JakZe

iTrader: (1)

Spartan gave me a mini heart attack . Then realized I didn't calculate the gap lol..

Thanks guys! This build is so far going smooth then!

Yeah I'm assuming with a hot test the psi will be a tad bit higher. But as long as their consistant amd within range I'm happy for now!

andyfloyd

last time I did a compression test on my built motor with 8.5:1 I got 175-178 across the board but it has well over 10k miles on it now. Numbers look great especially for a fresh motor on a cold engine.