hey i've been doing some research on vitara pistons and i havent been able to find the exact compression ratio for them, i was hoping someone could help me who already has them. also i was wondering about the long lasting reliability of them. also if anyone knows of a good place to get them new and for a good price it would be awesome. thanks.

kristina

 

we need a little more info. The compression varies with the motor you are using.

 

There is a 16 page Vitara piston thread on here somewhere. You can buy them from fjt on here, thats where I got mine

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by misskris220 &raquo;</TD></TR><TR><TD CLASS="quote">hey i've been doing some research on vitara pistons and i havent been able to find the exact compression ratio for them, i was hoping someone could help me who already has them. also i was wondering about the long lasting reliability of them. also if anyone knows of a good place to get them new and for a good price it would be awesome. thanks.

kristina</TD></TR></TABLE>

Search for the other thread. People's calcs of compression with these pistons varies. I believe some were down in the high 7.x to 1 though.

 

I beleive this to be an accurate estimation (the high 7.x:1) -- though they feel very stock when driving with some extra advance down low.

Boost response is also very good with my setup below. It seems as though my turbo spools faster than it did with the stock setup... Odd but seriously, if you start off going super slow in, say, third... i.e. 1500rpms, and just floor it, you have 5psi by 2500, and full boost by 3500.

I love my new motor, and I still haven't even tuned it. It's still only on .65bar, .5* retard per lbs, and piggley rich on 450s.

Matt

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Johnyquest &raquo;</TD></TR><TR><TD CLASS="quote">I beleive this to be an accurate estimation (the high 7.x:1) -- though they feel very stock when driving with some extra advance down low.

Boost response is also very good with my setup below. It seems as though my turbo spools faster than it did with the stock setup... Odd but seriously, if you start off going super slow in, say, third... i.e. 1500rpms, and just floor it, you have 5psi by 2500, and full boost by 3500.

I love my new motor, and I still haven't even tuned it. It's still only on .65bar, .5* retard per lbs, and piggley rich on 450s.

Matt</TD></TR></TABLE>

You didn't tune the last motor.

Please tune this one.

 

very approximate numbers( may vary by .1 or .2)

All with stock head and stock HG from the corresponding motor

D16Y7---&gt;8.5:1
D16y8---&gt;8.9:1(smaller and squared Chamber bumpr CR + the HG on this motor is thinner than the others)
D16Z6---&gt;8.5:1
D16A6---&gt;7.9:1

Combining Head gaskets:
D16Y7 and D16Z6 motor with Y8 head gasket(thinner than the y7 and z6) ---&gt;8.7:1


For every .04 that is milled off of the head compression ratios should go up 1 full point.
Example:
D16y7 motor(8.5:1cr) with a .04 milled Head or Block--&gt;9.5:1

**for every .012 that you shave/mill off your head or block the cam timing retards 1* degree**

 

Im using a jdm d15b with a Y8 headgasket and vitaras. How does that throw a wrench into your figures??? lol

 

i really dunno..D15's are another story cause the rod lenght in some motors is different than d16's

 

what if i have a d16y8 block with fj i beam rods and vitara pistons can i put a y8 head thats milled .08 to get a compression ratio of 10.5:1 safely without valves kissing the vitaras?? i plan on doin this to have a little fun as an NA motor b4 i go and a piece together a turbo kit. After i have completed buying everything for my turbo project i'll just swap my other stock y8 head on so that i can be back at the low compression of 8.5:1.

D16y8 with fjt I beam rods & vitara pistons = 8.5:1cr

milled block/head .04 = 1 full point. I.E. 8.5:1cr = 9.5:1cr
.12 = cam timing retards 1* degree**
-fjt