Ross end gap?

[1fast97gsx]

What should I set this at? My goal is around 500 whp. According to their calculations they say to take my bore : ( 3.366 * .004 ) + ( .004 * X ). X is 1 for every 30 horses per cylinder I want to produce over stock. So an extra 300 hp would be around 75 horses per cylinder. With that my gap should be .023 inches ... I have been hearing .030 - .034 is where I should be at because the rings will expand and the gaps will close up too far if I go smaller than .030. Can someone that has experience with these pistons / rings chime in? 2g 7 bolt bored .020. Thanks.

 

[half-cocked]

For engines that are blown, turbocharged, or run nitrous systems of more than 30 horsepower per cylinder add .004.

Thats straight out of the Ross installation guide and I take that as add .004 IF your engine is blown/turbo OR run a N2O system that adds more than 30 HP per cylinder. You dont add another .004 for every 30 extra HP. You add .004 because you are turbocharged. My gap is set at between .017 and .019. I have been told that if you plan on running big numbers consistently (which sounds like you are) add more gap, how much more than .017 I dont know.

 

[1fast97gsx]

yea I saw that in the ross instructions as well. I was planning on gapping about .028 but according to that my gap should be much smaller. Other people say .032 is the number to shoot for. So which is it?!?!

 

[half-cocked]

I just got off the phone with the Ross tech line and he said he would run (and I gave him your numbers) .020 in the top and .022 on the bottom ring, so I'm a little tight but its to late now my engine is assembled. Whoever said .032 is going through a lot of oil.

 

[1fast97gsx]

I just got off the phone with the Ross tech line and he said he would run (and I gave him your numbers) .020 in the top and .022 on the bottom ring, so I'm a little tight but its to late now my engine is assembled. Whoever said .032 is going through a lot of oil.

ok thanks for the info. I'll be using those numbers then I suppose

 

[swordfish]

I'm running .020 on the top ring and .017 on the second.

jeff

 

[my97mitsGSX]

mine are gapped at .018 or .019.. can't remember..

 

[half-cocked]

mine are gapped at .018 or .019.. can't remember..

Thats where mine are at.

 

[my97mitsGSX]

I hope its not going to be too tight..

 

[1fast97gsx]

I just called them to hear for myself .. they told me to go about .024. I told them I was running 30 psi at the track and planning on making 500 whp. .024 he said would be his suggestion ... too loose is also better than too tight they told me. Basically he said take the bore and multiply by .007.