Higher Compression
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Im doing Ls/Vtec and want to increase compression from my stock 10.2 to 11.0 - 11.2 Or atleast increase comprssion to 10.6 What would be the most cost effective way without having to use cam gears or after market pistons?
CTR pistons?
JDM ITR pistons?
Oh by the way im keeping the stock head.
Decking the block and using only the mid and lower pieces of the head gasket? is this an option or would i need the came gears because of the dcrease in clearance?
CTR pistons?
JDM ITR pistons?
Oh by the way im keeping the stock head.
Decking the block and using only the mid and lower pieces of the head gasket? is this an option or would i need the came gears because of the dcrease in clearance?
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not completly true uncle ben is running ctr pistons on pump gas and running good on ls/vtec..also get usdm itr pistons for around a high 10: compression.i forget the acual comp but the longer stroke will give you a little better compression.but you have a bigger combustion chamber in your si so you will loose about :2 compression from a grs head.also if you are worried about pinging the best investment you could make is a J&s safeguard.last of all your pistons will make about 11.4.1 compression so dont worry.
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I know the CTR pistons Comp is not to high but im wondering if the top is to high is the quench area large enough so that nothing taps? If so ill go withctr pistons but im just not sure.
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Stick w/ under 12:1. Running 12:1 is at the very edge of what is possible to run on pump gas and keeps you from being able to advance ign timing. Unless your planning on running some very big cams you will be able to make just as much power and be more reliable running about 11-11.6:1 w/ timing advance.
Comp numbers:
lsvtec b16a head w/ usdm itr pist ~ 10.9:1
lsvtec b16a head w jdm itr pist ~11.2:1 (best choice)
lsvtec b16a head w/ usdm b16a pist ~ 11.6:1
gsr head will yield a little higher c/r
Comp numbers:
lsvtec b16a head w/ usdm itr pist ~ 10.9:1
lsvtec b16a head w jdm itr pist ~11.2:1 (best choice)
lsvtec b16a head w/ usdm b16a pist ~ 11.6:1
gsr head will yield a little higher c/r
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any idea what compression i will be putting down the the usdm b16a pistons because i can get thoughs for free.
b16a jdm pistons compression is 10.4:1 how come so much higher with new block? The stroke changes compression by over a point? Never knew that.
b16a jdm pistons compression is 10.4:1 how come so much higher with new block? The stroke changes compression by over a point? Never knew that.
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Originally posted by "Someone"
Originally posted by hybridEG
k.j. where did you find those number?
Originally posted by hybridEG
k.j. where did you find those number?
lsvtec b16a head and usdm b16a pist ~ 11.6:1
lsvtec b16a head and jdm pist ~ 11.8:1
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.
Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richeypm me if you are interested in trying a free class at any of the gyms.
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My old CAR had 22:1 compression and enough fuel pressure to cut your fingers...what was it 
Fuel pressure was 8000 psi..I shit you not. A dollar to the victor..and it was STOCK...and dont bother arguing the 8000 psi..it was int he service manual
Fuel pressure was 8000 psi..I shit you not. A dollar to the victor..and it was STOCK...and dont bother arguing the 8000 psi..it was int he service manual
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