ls/vtec

[blick2319]

i"M building an ls/vtec i have a 90 ls bottom wth a 2000 gsr head. I want to get new rods and pistons. What the highest compression i can run on reg. 87 pump gas. Also what rod and piston combo will give me this compression thanks.

 

[B16]

on 87 pump gas? i guess like 9.5:1 - 10:1? why 87? that cannot be the best gas you have there. use your stock rods and pistons

 

[blick2319]

I heard that ls pistons can't hanlde the high rpm of the gsr though is that true?

 

[Bl6CRX]

Originally posted by blick2319@Nov 30 2003, 08:44 PM
compression i can run on reg. 87 pump gas.

there is no pistons that would be worth doing with a cr low enough for 87, i would never even run a stock b16 or gsr on 87 let alone anything built, on 91 you could go up to 12:5:1 with proper tunning, but a nice spot so you don't have to retard the timming to much is about 11:5...

 

[E_SolSi]

Originally posted by B16@Nov 30 2003, 09:05 PM
on 87 pump gas? i guess like 9.5:1 - 10:1? why 87? that cannot be the best gas you have there. use your stock rods and pistons

there is no pistons that would be worth doing with a cr low enough for 87, i would never even run a stock b16 or gsr on 87 let alone anything built,

89 is only about $.10 more per galon ($1.00 more per tank) than 87
91 or 93 is generally only $.15 - $.20 more per gallon ($1.50 - $2.00 more per tank) than 87

is that really that big of a deal???????

 

[lsvtec]

Originally posted by blick2319@Nov 30 2003, 09:33 PM
I heard that ls pistons can't hanlde the high rpm of the gsr though is that true?

This is not true.

 

[EJdmB18C]

87 Octane is TOO cheap for better pistons or rods...If you treat your motor good...YOUR MOTOR WILL TREAT YOU GOOD...

 

[blick2319]

ok so i'll run better octane. but i would still like to know what piston and rods i should run to get a good tunable compression in a 90 ls bottom with a 2000 gsr head. I dont' knwo how to calulate that he compression will be.
thankyou for your info though and please help me asap if u can answer this!

 

[mwasnp]

I would run civic type r pistons. I believe this will get you in the mid 12's:1 cr.

 

[blick2319]

thanks and what rods? should i just use stock ls with arp bolts. I wasn't going to replace them but i dunno what kind of condition they r in and i dunno how much it would cost to see what condition they in by a shop so i thought maybe it would be cheaper to just buy new ones. Please tell me what u think

 

[EJdmB18C]

Its better to replace them...but will cost a grip...