i was wanting to know if how much more compression the b16 pistons have (usdm or jdm) vs. the jdm type r pistons in my gsr block...im am rebuilding my motor for a mild all motor setup...i would like to run some skunk stage 1 cams as well, should i go with type r valvesprings/retainers, of should i go with skunk2 valvesprings/retainers. do they see any power gains past 8500rpms?

 

i believe you would end up with almost the same cr. ctr pistons would bump it up nice if you wanna keep oems

 

i think the ctr would be a little to gung ho for me...i heard those bump to like 12.3:1 in a gsr motor. i dont wanna have to worry about tuning that much.

 

JDM ITR pistons have 5.96cc PDD
USDM B16 (PR3) pistons have 6.01cc PDD
JDM B16 (P30) pistons have 6.93cc PDD

The 1st two are only going to differ by like .01-.02 points. The third will be + .2 compression points.

 

CTR pistons come in just over 12:1 in a GSR w/ stock gasket. Something like 12.04:1 if I recall.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr Milano &raquo;</TD></TR><TR><TD CLASS="quote">JDM ITR pistons have 5.96cc PDD
USDM B16 (PR3) pistons have 6.01cc PDD
JDM B16 (P30) pistons have 6.93cc PDD

The 1st two are only going to differ by like .01-.02 points. The third will be + .2 compression points.</TD></TR></TABLE>

according to the honda dealership i work at, usdm b16 pistons are p30's.

 

Alot of the B16A3 Del Sol parts use P30, alot of the 99-00 Si B16A2 use PR3.

Which ever way you call them the numbers listed are correct. I do know however the A0 and 00 is what separates the USDM and JDM.

 

how much more compression will the jdm ones give? should i just get the usdm ones from my work, i can get those pretty cheap, and they take it outta my check, so i dont need the cash up front.

 

ill be running the P30 pistons by the end of this month(hopefully). should bump the compression around 11:3:1, ben at AJ Racing where i bought the pistons from told me it should be closer to 11:5:1

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr Milano &raquo;</TD></TR><TR><TD CLASS="quote">JDM ITR pistons have 5.96cc PDD
USDM B16 (PR3) pistons have 6.01cc PDD
JDM B16 (P30) pistons have 6.93cc PDD

The 1st two are only going to differ by like .01-.02 points. The third will be + .2 compression points.</TD></TR></TABLE>
i couldnt have said it better

 

If you want power up high, go with high compression. Check out c-speedracing.com, they have the c/r calculator. I'd say, either go for the p30 or ctr pistons. But if you just want a cheap, laid-back setup, pr3's are great.

 

i hear a lot of people talking about ctr cams in a gsr motor being too high for pump gas without being highly tuned...i dont want to spend a fortune on this motor, mainly because i do not have a fortune, but do you think i could get away with buying ctr pistons?

 

You don't have to spend a fortune going with the ctr route. All you have to do is get a set of skunk2 stage 2 cams, ITR valve train, and you're good to go up to 8500rpm. 93 octane shouldn't be a problem if you retard your timming and richen your a/f mixture a bit.

Also, it's a safer idea to go with oversized pistons so you won't get screwed by a machine shop overhonning your cylinder walls.

Hopefully, I can put my gsr head back soon and give people a second thought about trashing the ctr pistons.

 

I like that Mr. Milano

 

If your looking for some JDM ITR piston (STD size) , I have a set I'll sell you. Brand new in the box, not through work but personally own a set.

PM me,
Bert

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BERT-O &raquo;</TD></TR><TR><TD CLASS="quote">I like that Mr. Milano</TD></TR></TABLE>

Why thank you.

 

What would you guys personally recommend, for a safe/reliable GSR daily driver ...either PR3 pistons, or P73-00 JDM ITR pistons? Does it really matter?

 

ok, id hate to put the pressure on all you guys...but you are the deciding factor wether i get usdm b16 pistons or ctr pistons...so please give me a good informative lowdown on the capabilities of my engine with either of these...thanks

 

Okay, from my current understanding of your situation, I'd say go with the PR3. It will give you your money's worth. PCT are expensive and you're not going to see much gain unless you have it fully tuned.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by guymosiris &raquo;</TD></TR><TR><TD CLASS="quote">What would you guys personally recommend, for a safe/reliable GSR daily driver ...either PR3 pistons, or P73-00 JDM ITR pistons? Does it really matter?</TD></TR></TABLE>
there wont be to much of a compression change between those two pistons, so it really doesnt matter which ones u use. however itr pistons are coated with a low-friction material which creates more power per combustion, hense the pistons slide faster.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by allmtr &raquo;</TD></TR><TR><TD CLASS="quote">
there wont be to much of a compression change between those two pistons, so it really doesnt matter which ones u use. however itr pistons are coated with a low-friction material which creates more power per combustion, hense the pistons slide faster.</TD></TR></TABLE>
Thanx man. I think I'm gonna go with the P73-00's. Does anyone know where I can buy a brand new set with rings and pins?

 

bert-o said in above post that he has a set of jdm p73. and he has the hook up for rings to go with them.

 

what kind of power will usdm b16 pistons (.025 overbore) and skunk stage 1 cams put down properly tuned?? what kind of fuel upgrades will i need, and what valvesprings/retainers should i use?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr Milano &raquo;</TD></TR><TR><TD CLASS="quote">Alot of the B16A3 Del Sol parts use P30, alot of the 99-00 Si B16A2 use PR3.

Which ever way you call them the numbers listed are correct. I do know however the A0 and 00 is what separates the USDM and JDM.</TD></TR></TABLE>So, are the b16a3 del sol p30's pistons exactly the same as the JDM p30's?

 

From left to right:

USDM SI pistons, JDM ITR pistons, and JDM CTR pistons





If anyone wants me to weigh them, I can do, lol.
-Bert