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Old 01-12-2012, 05:59 PM   #1 (permalink)
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Default Piston ring gap??

I just need some one to throw some input and let me know if my gap sizes are alright before i do them. I searched and came out to this for a conculsion.
1st ring. .019
2nd ring. .021
Oil ring. .023

Its a z6 block bored .40 over(yes i know its big but what i had to work with) had the p2w set to .003. They are vitara pistons. I am shooting for 350whp. Do the gaps seem alright or should i make them a bit bigger or smaller.

I want to know quick so i can finish plastigauging the bearings tonight and put the pistons in. thanks for the input.
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Old 01-12-2012, 08:02 PM   #2 (permalink)
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Old 01-13-2012, 01:24 PM   #3 (permalink)
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alright what did you do for the oil ring gap?
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Old 01-13-2012, 07:19 PM   #4 (permalink)
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I did exactly the specs in your first post. Y8 75.5mm vitaras, made 300whp and then turbo took a dump. Didn't burn oil in the first 500 miles and is fine as far as I know.

I ran whatever the oil rings were from the box, I think .024". Just checked them to make sure they weren't super tight and threw them in.
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Old 01-14-2012, 12:25 PM   #5 (permalink)
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I used the laskey racing formula

bore in inches x .006 top
bore in inches x .0065 2nd

comes out to .019 an .021
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if it survives the winter JdM d15b+Vitara+FJT+25psi=
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Old 01-14-2012, 03:14 PM   #6 (permalink)
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i did mine a little loser from what i found searching on here
.020 top
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Old 01-14-2012, 06:26 PM   #7 (permalink)
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Quote:
Originally Posted by stevenarroyo View Post
i did mine a little loser from what i found searching on here
.020 top
.022 second
A thou here or there isn't going to kill a motor

If I went 22 on accident I wouldn't sweat it it would just have a bigger blue "power puff" between shifts
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if it survives the winter JdM d15b+Vitara+FJT+25psi=
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Old 01-15-2012, 07:07 AM   #8 (permalink)
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Quote:
Originally Posted by Speedjunky01 View Post
I used the laskey racing formula

bore in inches x .006 top
bore in inches x .0065 2nd

comes out to .019 an .021
^^^this^^^
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