itr pistons with sknk 2 stg 2 cams?
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itr pistons with sknk 2 stg 2 cams?
Got a '94 gsr motor with i/h/e, lightweight flywheel/crankshaft pulley in a '98 hx.
I want to put in itr pistons on the stock rods with skunk 2 stage 2 cams. They say the compression will be around 11.3:1. Will this be high enough for these cams? If so can you recommend good springs, retainers, and valves?
On another note, If I ran a 9.5 in the 1/8th on the hx rims and now I have 16in wheels and tires would my time be way worse or better because of better traction. The heavier rims seem to slow me down a little but I would probably be able to launch at a higher rpm and still get traction. What are your guys experiences with going from a stock rim and tire to a bigger rim with better tires. By the way the hx rims had on snow tires and the 16 in rims have kumho ecsta supra 712's.
Cliff notes:
Do Itr pistons have enough compression for skunk 2 stage 2 cams?
Bigger rims make you slower or faster at drag strip?
Thanks,
98civic94gsr
I want to put in itr pistons on the stock rods with skunk 2 stage 2 cams. They say the compression will be around 11.3:1. Will this be high enough for these cams? If so can you recommend good springs, retainers, and valves?
On another note, If I ran a 9.5 in the 1/8th on the hx rims and now I have 16in wheels and tires would my time be way worse or better because of better traction. The heavier rims seem to slow me down a little but I would probably be able to launch at a higher rpm and still get traction. What are your guys experiences with going from a stock rim and tire to a bigger rim with better tires. By the way the hx rims had on snow tires and the 16 in rims have kumho ecsta supra 712's.
Cliff notes:
Do Itr pistons have enough compression for skunk 2 stage 2 cams?
Bigger rims make you slower or faster at drag strip?
Thanks,
98civic94gsr
Joined: Jan 2004
Posts: 1,122
Likes: 0
From: rebuilding in, wv, United States
Re: itr pistons with sknk 2 stg 2 cams? (98civic94gsr)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98civic94gsr »</TD></TR><TR><TD CLASS="quote">Do Itr pistons have enough compression for skunk 2 stage 2 cams?
Thanks,
98civic94gsr
</TD></TR></TABLE>
Your Static CR with USDM ITR Pistons would be around 10.97:1. No where near high enough for skunk2 stage II's. Thats with .005" milling of the head.
" " w/ JDM ITR Pistons would be around 11.5:1 Thats more or less near the operating range.
We worked out that the minimum static CR that would keep SK2 Stage 2's (assuming an intake ABDC closing spec of 49 degrees which hasn't yet been confirmed) at the 15% gain in cranking pressure that you want from using the dynamic CR calculator was 11.6 and that 12:1 would be ideal. So there's your operating range for that.
As for your valvetrain, you must upgrade it. Dual valvesprings.. not too much to the side of the retainers.. And valves, do NOT use oversize valves. They tend to grab each other and destroy motors.. Timing belt, purchase a kevlar belt such as GReddy or TODA.
Thanks,
98civic94gsr
</TD></TR></TABLE>
Your Static CR with USDM ITR Pistons would be around 10.97:1. No where near high enough for skunk2 stage II's. Thats with .005" milling of the head.
" " w/ JDM ITR Pistons would be around 11.5:1 Thats more or less near the operating range.
We worked out that the minimum static CR that would keep SK2 Stage 2's (assuming an intake ABDC closing spec of 49 degrees which hasn't yet been confirmed) at the 15% gain in cranking pressure that you want from using the dynamic CR calculator was 11.6 and that 12:1 would be ideal. So there's your operating range for that.
As for your valvetrain, you must upgrade it. Dual valvesprings.. not too much to the side of the retainers.. And valves, do NOT use oversize valves. They tend to grab each other and destroy motors.. Timing belt, purchase a kevlar belt such as GReddy or TODA.
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