I'm just wondering if any people on here are running pr3 pistons in their lsvtec setups. I was told they yield about 11.5:1 compression ratio with an oem 3 layer headgasket and a GSR head, is this true? Could it be more/less?

Also how big of a lift cam are you guys using. Plan on using toda b's and they require a 12 compression to be used to their full potential. Maybe a 1 layer headgasket?

 

i currently run the pr3's in my ls/vtec i got them .25 over with a gsr head your comp. will be slightly higher than mine i run the b16 and i believe my copm is around 12-1 but i also had a little taken off the head and block but not much

i would also stick with the oem head gasket and i also run the skunk2 stg 2 cams with skunk springs and retainers i ran the stage 1's for the first 7,000 miles or so and they are just fine for that app. i just changed a few things on my set up and needed a more agressive cam (by the way i have the stg 1's for sale and a full set of itr inner and outer springs )just to let you know

 

^^^ what layer headgasket are you using?

The compression calculator said i have about 11.3:1 compression with an oem 3 layer headgasket so i don't think i'd have more than you would. I also have a stock bore ls block and the head was not milled...

 

oem

 

does anyone else also agree that i'd have a compression ratio of 12.1:1 or higher with pr3's and an oem headgasket?

 

no..i think ityd be lower...just a lil higher over yer previous guess

 

hmm...so with a 2 layer i assume i'd have about 12.0:1 or alil higher

i used the compression calculator but i heard it was a bit off, is that true?

 

anyone else?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EGkid &raquo;</TD></TR><TR><TD CLASS="quote">I'm just wondering if any people on here are running pr3 pistons in their lsvtec setups. I was told they yield about 11.5:1 compression ratio with an oem 3 layer headgasket and a GSR head, is this true? Could it be more/less?

Also how big of a lift cam are you guys using. Plan on using toda b's and they require a 12 compression to be used to their full potential. Maybe a 1 layer headgasket?</TD></TR></TABLE>

Try its more around 11.8:1 to 11.9:1 CR!


B18 block
PR3 Pistons
oem gasket
B18C1 head

 

bump, thanks for the input guys

 

ttt

 

Good Luck!

 

thanks

 

to the top

 

im going with the same set up as you pr3 pistions ls rods b16a1 head and im putting it in a ef9

 

going 2 be a little lower than the gsr gsr combustion chamber is welded a b16 is not

 

yeah i was about to say my compression ratio would be alittle higher because of the gsr head

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EGkid &raquo;</TD></TR><TR><TD CLASS="quote">yeah i was about to say my compression ratio would be alittle higher because of the gsr head</TD></TR></TABLE>

Yes it will!

 

well what can i do to lower my compression? I am looking to use either b16 pistons or type r psitons . What kind of oem pistons should I use? What specific oem head gasket should I use. Everyone says oem 3 layer but where do I get them?

 

I'm running 12.2:1 with CTRs and a OEM 3 layer.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alloysr16s &raquo;</TD></TR><TR><TD CLASS="quote">well what can i do to lower my compression? I am looking to use either b16 pistons or type r psitons . What kind of oem pistons should I use? What specific oem head gasket should I use. Everyone says oem 3 layer but where do I get them?</TD></TR></TABLE>

If you want to lower your compression than you want to use B20 or LS pistons, but why do you want to do that unless you were going turbo!