.20 over bore pistons and ring gap - Boost Forum

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.20 over bore pistons and ring gap
Saturday, August 02, 2008 3:24 PM
who has done this setup in a ld9 engine and had to gap the rings alot . ? was it much because i did not gap the rings and i am going s/c so i wanna see what you guys had to day. i am new to this .



http://www.cardomain.com/ride/2623318




Re: .20 over bore pistons and ring gap
Monday, August 04, 2008 7:45 PM
anybody know the gap size for the rings i should use ?



http://www.cardomain.com/ride/2623318



Re: .20 over bore pistons and ring gap
Monday, August 04, 2008 8:18 PM
Depends what type of rings your using.

Whats your piston setup like? Forged?

If forged you should get a set of rings with your pistons based on the manufacturers specs and usually they will offer you a guideline for what you should gap them at.

Such as...

street N/A gap x1
Turbo street gap x1.5
supercharged street gap x1.7
track N/A x1.7
track turbo x2.5
track supercharged x2.7


Basically the way wiseco does it is they give you a spec (say 0.010") and then you use the multiplier based on what your application is.so a street N/A car will be at 0.010" turbo track car should be at 0.025" which of course is huge for a street car...not so big on a track car that rarely sees non-boost conditions.



Buildin' n' Boostin for 08' - Alex Richards
Re: .20 over bore pistons and ring gap
Tuesday, August 05, 2008 4:32 AM
well i went on to their website and http://www.wiseco.com/PDFs/Manuals/RingEndGap.pdf this is what they listed and my bore size is 3.5630 and i am supercharged and fully built engine but it is still a daily driver and i came up with 18 on the top and 20 for the second ring



http://www.cardomain.com/ride/2623318



Re: .20 over bore pistons and ring gap
Tuesday, August 05, 2008 12:46 PM
Sounds about right.

Should be good to run with that...



Buildin' n' Boostin for 08' - Alex Richards
Re: .20 over bore pistons and ring gap
Wednesday, August 06, 2008 12:16 PM
id recommend getting a shop to do it right, don't guess and think you know what your doing in your garage and have a crappy motor, pay the money get it done right like any serious tuner would do. sorry to sound cocky but only top of the line hands should handle any internal motor work.




Re: .20 over bore pistons and ring gap
Wednesday, August 06, 2008 12:25 PM
BOOSTED / JMdecals.com! wrote:id recommend getting a shop to do it right, don't guess and think you know what your doing in your garage and have a crappy motor, pay the money get it done right like any serious tuner would do. sorry to sound cocky but only top of the line hands should handle any internal motor work.

forget that. there is one way to learn about engines, and that is to take them apart and put them back together. if it's a DD, then i could understand wanting to have it done quickly and done right, but if it's a fun car, DIY all the way.



87 Firebird
All stock...........lol.
Re: .20 over bore pistons and ring gap
Wednesday, August 06, 2008 4:58 PM
lol i built my car myself except for the internal motor work because i actually care about the expensive parts i've bought and would rather not buy them again from testing my newbie internal work on my motor.






Re: .20 over bore pistons and ring gap
Wednesday, August 06, 2008 7:15 PM
no i was just trying to figure out the gap for the boosted application



http://www.cardomain.com/ride/2623318



Re: .20 over bore pistons and ring gap
Wednesday, August 06, 2008 7:45 PM
Well I go to class for this, There is a reason engine rebuild classes are done first in an automotive degree...Its easy, its not rocket science you just really have to pay attention to detail and really know how to handle instruments and measure correctly and KNOW what your doing before you do it...Really thats all there is to it. Nothing wrong with a back yard rebuild So long as you have the tools and the means to do it correctly.



Buildin' n' Boostin for 08' - Alex Richards
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