I have a b16 swap in my 94 ex coupe and im getting tired of the no torque from

the b16. I bought a 98 gsr shortblock from a guy and evrything is good except for

the rings. Anyways i am in the process of building a poor man's type r and i was on

cspeedracing.com and was calculating the compressions i will make with the combo

Well my plan is to have this:

1998 GSR BLOCK
w/ STOCK CRANK AND RODS
w/ P73 ITR PISTONS.
B16 HEAD w/ ITR/CTR CAMS
AND ITR VALVES AND SPRINGS.
B16 Tranny w/ new clutch and 4.9 final drive.
p72 gsr jun programmed ecu
Well anyways...
It says that it would make more compression with the p30 jdm b16a pistons (which i do have right now) and a b18b1 block. with the b18b1 and p30 pistons it would make a 12:1 compression ratio.

I already know what i want to do with the head but for the block im lost. i already have the block but what pistons do you recomend? gsr or b16?

 

I did nearly the same thing with my B18C5, i am using all stock bottom end except for the pistons, i went with the CTR pistons, and i'm now creating a higher compression around 12:1. If i where you i would buy the B20 longblock and use thows B16a pistons to make that 12:1 compression with all the torque of that 2.0, you could make some serious bottom end power and a ton of top end vtec power with that 12:1.

 

so you have a b18c5 or b18c1? if i were to buy that b20 block is it not a 84.00mm

bore and the b16 piston is for a 81.00mm block? and i have heard that the b20

crank and rods suck really bad. anyways....with the b18c1 with my b16 pistons

and 2 layer head gasket it says i should make around 11:9:1 compression. and on

that b20 i would have to drill for vtec on all that other **** ..why not just make the

b18c1 the block? i want all opinions if i can that would be great.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by havsom &raquo;</TD></TR><TR><TD CLASS="quote">I did nearly the same thing with my B18C5, i am using all stock bottom end except for the pistons, i went with the CTR pistons, and i'm now creating a higher compression around 12:1. If i where you i would buy the B20 longblock and use thows B16a pistons to make that 12:1 compression with all the torque of that 2.0, you could make some serious bottom end power and a ton of top end vtec power with that 12:1.</TD></TR></TABLE>


second post you have no idea what you are talking about!!!


you can not use b16a pistons in a b20 block!!!

 

WTF! is he serious about the B20 block and B16 slugs???

 

Your basic setup is sound. P73 pistons will give you 10.6:1 compression. P30's will yield a bit higher compression and require better tuning to run pump gas (91 here in California).
Don't listen to this guy:
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by havsom &raquo;</TD></TR><TR><TD CLASS="quote">If i where you i would buy the B20 longblock and use thows B16a pistons to make that 12:1 compression with all the torque of that 2.0, you could make some serious bottom end power and a ton of top end vtec power with that 12:1.</TD></TR></TABLE>
81mm B16a pistons will not seal so well in an 84mm bore B20 block

 

The CRV block and the LS block both have poor rod to stroke ratios which don't make them good candidates for revving too high. The quality of your build is what matters.

If you ran with a 12:1 compression then you would probably need to be running on some pretty high octane gas.

Whoever posted saying that CTR pistons will fit in a B20 block is very misinformed. B16a pistons are 81mm which would be rather small for an 84mm bore and it wouldnt seal. Seeing that comment gave me a good laugh.

 

THATS WHAT I THOUGHT. MAYBE BECAUSE IM A NEWBIE BUT I KNOW THAT THE COMBO OF B20 AND P30 PISTONS WOULD WORK OUT TOO WELL. SO FAR WHATS DOES EVERYONE THINK OF MY SETUP?

 

 

there's a ton of misinformation being tossed around in this thread... search

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jh &raquo;</TD></TR><TR><TD CLASS="quote">
I already know what i want to do with the head but for the block im lost. i already have the block but what pistons do you recomend? gsr or b16?</TD></TR></TABLE>

What compression are you shooting for? With the GSR block, you have a few different options. You said you're going to be using a B16 head, so GSR pistons aren't the best alternative, as the compression is going to be too low for a good N/A build. Knowing what your goals are first, can save you a lot of headaches in the future. Determine what compression you'd like, then you can find the right piston for your motor.

 

my goal for right now is 11:5:1 to 12:1.....i want to keep the gsr pistons becasue when i get tired of the all-motor setup in the future i will put them back and boost it. for right now all i want is a nice compression piston to hopefully put 170-180whp.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jh &raquo;</TD></TR><TR><TD CLASS="quote">my goal for right now is 11:5:1 to 12:1.....i want to keep the gsr pistons becasue when i get tired of the all-motor setup in the future i will put them back and boost it. for right now all i want is a nice compression piston to hopefully put 170-180whp.
</TD></TR></TABLE>

When you say "keep the GSR piston" do you mean run those pistons for your N/A set up? Or just hang on to them for use later on? If you want to use them now, then you're going to need headwork or a thinner headgasket, or both, in order to bring your compression up. GSR block, B16 head, and GSR pistons is not a very good idea for N/A IMO.
I could give you examples of my current set up and old set up, but every motor, dyno, and tuner is different. I imagine with B16 or ITR pistons in the GSR block, simple bolt ons, and at least ITR cams, you'd be in the 170-180 peak hp range, I know I was.

 

$5 says this turns into a R/S ratio thread.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by WAFFLES &raquo;</TD></TR><TR><TD CLASS="quote">$5 says this turns into a R/S ratio thread.</TD></TR></TABLE>
LOL, god i hope not

 

Stop jacking this man's thread and filling it with BS. I say you should run the b18b block w/ b16 pistons. It will yield a high compression and a lot of torque.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jh &raquo;</TD></TR><TR><TD CLASS="quote">
I already know what i want to do with the head but for the block im lost. i already have the block but what pistons do you recomend? gsr or b16?</TD></TR></TABLE>

In a B18b block use the B16 pistons b/c the GSR pistons will lower your compression!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by havsom &raquo;</TD></TR><TR><TD CLASS="quote">I did nearly the same thing with my B18C5, i am using all stock bottom end except for the pistons, i went with the CTR pistons, and i'm now creating a higher compression around 12:1. If i where you i would buy the B20 longblock and use thows B16a pistons to make that 12:1 compression with all the torque of that 2.0, you could make some serious bottom end power and a ton of top end vtec power with that 12:1.</TD></TR></TABLE>


B16 pistons are 81mm bore, and B20 blocks are 84mm bore... See anything wrong there...?

The LS bottom end yields more compression because the the rods are longer than those found in VTEC block... This gives the piston more dwell time, and the piston travels a bit higher in the cylinder on LS rods than they would on shorter B16 rods...


I'm running USDM ITR pistons in my B18A bottom end, with a milled GSR head... My compression is somewhere in the neighborhood of 11.0:1-11.5:1 (I'm pretty much guessing here)... When I compression tested the motor it pulled 275psi across the board... Anyone know how to convert that to ratios...?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4U2NV &raquo;</TD></TR><TR><TD CLASS="quote">The LS bottom end yields more compression because the the rods are longer than those found in VTEC block... This gives the piston more dwell time, and the piston travels a bit higher in the cylinder on LS rods than they would on shorter B16 rods... </TD></TR></TABLE>

I don't know about B16 rods for sure, but GSR/ITR rods are longer than B18B rods.
Just to clarify.

 

i dont have the figures in front of me, but looking at the r/s ratio difference of the 2 engines, ITR being 1.58:1 and LS being 1.54:1 the difference is very very minimal.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b19coupe &raquo;</TD></TR><TR><TD CLASS="quote">

I don't know about B16 rods for sure, but GSR/ITR rods are longer than B18B rods.
Just to clarify.</TD></TR></TABLE>

The B18B has a longer stroke! About the rods, Im not sure but I think you may be wrong!

GSR/ITR 87mm

LS 89mm

 

B16a rod length----(c to c) 5.290"
B18B rod length----(c to c) 5.394"
B18C rod length----(c to c) 5.433"

GSR/ITR stroke is 87.2mm and the LS stroke is 89mm.
All else being equal, longer stroke = shorter rods.