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Discussion Starter #1
y7 Block, .20 over Vitara/Eagle Setup
y8 head

13,000 miles

Cylinder #1 - 140
Cylinder #2 - 135
Cylinder #3 - 140
Cylinder #4 - 140

Testing before I buy more turbo parts

My tuner/mechanic said it was perfect!

What's your guys numbers? ptw clearance .0035
 

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Discussion Starter #3
and just for laughs, done a test on my built gx200 go kart.

it was 150 lol

It's got 12:5:1 compression ratio :D, it's a rocket
 

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Discussion Starter #5
i got 270psi on all 4.. built about 1 1/2 years ago..
on a vitara build???????????

i've never heard of anything that high

your clearances must have been tighter than a nuns pussy
 

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your ptw clearance shouldnt have anything to do with the comp ratio... but 150 is where my vitaras are at right now
 

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What diesel was this on?
plenty of all motor cars see 300+ psi of compression.


OP- numbers sound pretty good to me. mot vitaras are from 140-160 from what i've seen
 

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plenty of all motor cars see 300+ psi of compression.


OP- numbers sound pretty good to me. mot vitaras are from 140-160 from what i've seen
really? I havent seen them that high on anything, Guess i learn something new today. What cars have that much compression?
 

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Discussion Starter #11
The highest i've saw was a 11:5:1 compression V8 and it was like 260.

It scared me at first and my tuner/mechanic said it was perfect
 

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depending on the setup some mildly built b's will see 260-270 with about 11.5-12:1 CR. Higher than that and you will start flirting with 300 but it depends on a lot of things
 

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Discussion Starter #16
my fjt/vitara z6 bored to 75.5mm put down 180 across all 4.
I guess the longer rods had a factor in that, i'm running eagles
 

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i pegged my schools 280 psi snap on compression gauge. Im sure i had atleast 300 psi 13.2:1 is ALOT of compression. funny to see that thing roll all the way over and peg everyone in my class couldnt belive it.
 

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Discussion Starter #20
.0035 PTW? too tight for my liking, especially for a cast piston.

imho, vitaras need at least .006 if you plan to make decent power.
I let my very reputable mechanic decide this, Vitara/Builds accounts for about 60% of his business, not dissing you or anything i'm just saying thats why it is the way it is.

My goals are 300 WHP
 
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