tuninghaus

iTrader: (2)

anyone know what #'s we should see in a compression for the SC300 (pre-vvti- 92-97) "healthy" motor?

i think the non vvti are 9.5 or 10.0:1 compression ratio? and the vvti is 10.5:1?

thanks

booja

iTrader: (1)

"healthy compression" when you run tests and compression ratios are are not the same...

when you run a test youre not gonna see 10:1, youre gonna get a number in psi like 195

i dont know what healthy numbers are for 2j is but it should all be in close range...

if thats what youre asking...

blaznsc4

when doing a compression test make sure that all cylinders are no more than 15psi apart from each other.

O. L. T.

iTrader: (17)

use the engine forum.

tuninghaus

iTrader: (2)

lol yes i know the difference between compression #'s and compression RATIO. sorry, i was asking two questions, what are the compression #'s on normal healthy 2jz-ge's (pre 98's) AND what is the compression RATIO on them.

yes i did do a search, don't know but i didn't see many topics that answered my questions.

SiennaII's

compression specs are 178psi or more, 142psi minimum with a difference of no more than 14psi and that's from Toyota's TIS system.

tuninghaus

iTrader: (2)

thank you!!! that is on the pre-98 SC300's right?

i know my supra had around 140-150psi compression 8.5:1 but it ran very strong and put down probably 750-800whp still.

a fellow lexus owner quoted to be over 200psi. i found that kind of strange and oddly high.. even for higher compression motors like ours. glad that it's in the 178-180 range...

my first three cyl read exactly that, 180's and the last three read like 200-210! lol

blaznsc4

i did a compression test on my 1j and it was 170 across the boards.

tuninghaus

iTrader: (2)

that's good stuff man! but i think 1jz's are 8.5:1 compression as well? the 2jz-GE being a 10:1 motor might (should) read higher compression #'s... ?

Sc dRifta

im rockin a great 172 all teh way around except for the 6th cylinder 165 barly made it

SiennaII's

Yeah, specs were for a 92 SC, non VVT-i