searched, found no dyno proof, no numbers.


so with stock everything except exhaust. what increase in whp would ctr pistons with stock hg make, and also with a thinner hg

 

found a sheet

 

^ that's about right

 

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

</TD></TR></TABLE>thats the funniest **** i've ever seen

 

Yep, now how about a real answer. why is it that everyone in this forum acts like questions are jokes. I really need to know this and soon for my rebuild.

 

People are clowning because the whp increase from JUST CTR pistons in a b16 is arbitrary in terms of real, significant performance. One quick stop at the c-speedracing comp. ratio calculator ( [URL] http://www.c-speedracing.com/howto/c...c.php[/URL] ) shows that a stock b16a2 has a 10.2 CR, while the same motor with CTR pistons yields a 10.8 CR.

While it might be good for a few whp, the reality is that without different cams, cam gears, more efficient intake and exhaust flow, or tuning, there would be little difference in actual performance. Basically, it isn't true that higher CR = more HP.

It seems narrow-minded to only upgrade one part of the motor's internals while leaving everything else stock. If budget is your concern, there is hp to be made by different upgrades than the pistons. Just my thoughts.

 

Just doing ctr pistons will increase compression significantly...more like 11.5 or more. About the most compression you could comfortably run. As far as hp and torque its not really easy to just put a number on it. I'd personally pick another piston, but truthfully. I have seen some pissed off motors run great with these...despite lots of people whining about poor flame travel. If youre trying to weight price vs horsepower gains ...good luck. it takes a good amount of work to a b16 to make big hp improvements.

 

f**ck**&gt;! lego builders...

 

Heres my situation. I am rebuilding my motor with pistons and rings

So I can either use stock and sell the new CTR pistons for $180 or use these CTR pistons.

 

Heres a car i did not very long ago, the answer is you will see a VERY good increase in power:

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vteckidd &raquo;</TD></TR><TR><TD CLASS="quote">
We recently had a customer that had a 99-00 Civic Si that was consuming oil regularly. about 2 qts a week. We determined it was his rings that were shot after 120k miles, opted to rebuild it. while we were in the motor we decided to throw some CTR pistons in the mix.

Mods:
B16a2
Stock BORE
CTR PIstons OEM honda rings
DC USDM 4-2-1 header
ApexI World Sport Exhaust
VAFC Tuning
ACL Bearings


Now a bonestock civic si dynos between 130-135whp. A bone stock GSR makes 145-150whp. His baseline with the shot rings was 127whp. thats a SOLID 23whp gain from PISTONS only. The factory hone was still present after 120k miles, so NO MACHINE WORK WAS DONE. more proof that honing is NOT NEEDED if there is still cross hatches, motor doesnt burn a DROP of oil.</TD></TR></TABLE>

Tuning was done with a VAFC for about 30min through the pipe sniffer which is normally about .5-.7 a/f pt off.

 

Any idea what your new piston to deck clearance will be?

 

that is really a sad dyno sheet. Around here stock b16's and i mean bone stock put down anywhere from 145-155whp. and GSR's easily put from 155whp-160 im guessing it's all on the tuner.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by H9Omega &raquo;</TD></TR><TR><TD CLASS="quote">that is really a sad dyno sheet. Around here stock b16's and i mean bone stock put down anywhere from 145-155whp. and GSR's easily put from 155whp-160 im guessing it's all on the tuner.</TD></TR></TABLE>

You cant call it bone stock if it was tuned right?

you

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by H9Omega &raquo;</TD></TR><TR><TD CLASS="quote">that is really a sad dyno sheet. Around here stock b16's and i mean bone stock put down anywhere from 145-155whp. and GSR's easily put from 155whp-160 im guessing it's all on the tuner.</TD></TR></TABLE>

Yea. Its all in the tuner. Nothing to do with the type of dyno used.

 

very little

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by H9Omega &raquo;</TD></TR><TR><TD CLASS="quote">that is really a sad dyno sheet. Around here stock b16's and i mean bone stock put down anywhere from 145-155whp. and GSR's easily put from 155whp-160 im guessing it's all on the tuner.</TD></TR></TABLE>

this is what i love, the guy that assumes all dynos are equal an all cars are the same and every engine is the same.

STOCK B16s on MY DYNOJET make between 125-135whp depending on how healthy they are.

as i stated, this particular BASELINE was with BAD OIL CONTROL RINGS, an he made 127whp. so with pistons, he made 150whp, barely tuned if you can call it that. So 23whp from PISTONS is def not a gain in my book


Furthermore, GSRs make 145-150whp on my dyno. ITRs make 165-170whp.

So this little b16 with i/h/e and CTR pistons made what a stock GSR makes WHP wise, IMO thats not bad at all.

but what do i know

 

My experience is much more like VtecKiDDs. 125-135 whp for b16.

I don't know if higher compression pistons will add much hp to a stock motor but if you put in a set of cams that use the higher compression that is a different story.

 

i just finished fitting itr cams into my ef b16a crx, it feels alot more punchy BUT it has crappy hunting issues atm :lol: (needa new alternatour i guess) also it needs a new header as i blew a hold in my 4-2-1 unit at the weekend :lol:

when its all sorted ill get a decent dyno with a 4-1 header and it all re-re mapped (it was already mapped once as soon as it was ran but it could be a little better )

 

my b16 with just i/h/e and clutch made 155 hp and 110 tq.

 

you will most likely have a 3whp peak. with just installing them. untuned. from a stock b16a.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hYbRiD EeEkAy &raquo;</TD></TR><TR><TD CLASS="quote">my b16 with just i/h/e and clutch made 155 hp and 110 tq. </TD></TR></TABLE>



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

this is what i love, the guy that assumes all dynos are equal an all cars are the same and every engine is the same.

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

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Combustion Contraption &raquo;</TD></TR><TR><TD CLASS="quote">Any idea what your new piston to deck clearance will be?</TD></TR></TABLE>

Actually, i have no idea. I dont even know what it means or why it would change. Thats why im here asking for help. I have no clue as to the original of pistons. I just know they are ctr replicas because they say PCTX right on the side.

So im assuming i can just take this to a shop and have them measure the pistons and bore out accordingly. Because I am thinking they are oversized based on that marking on the top.

 

look, a PR3 piston looks like this



PCTs look like this



The CTRs look like the Rocky Mountains and the PR3s look like the Great Plains

The deck height between a B16A block and B16B block are not the same. The B16B block itself is the same as a GSR/ITR block other than internals. So with that mountain sized dome, you gotta be carefully when you put these in B16A blocks. Also why people suggest not to mill the head in this setup.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drumminforev &raquo;</TD></TR><TR><TD CLASS="quote">Actually, i have no idea. I dont even know what it means or why it would change. </TD></TR></TABLE>

Piston to deck height is the amount the piston sits in the bore (or out of the bore) while at TDC. Most B stuff is around .030 i think from the factory. The CTR pistons have a different compression height than the p30's / pr3's so the pistons stick out of the hole by about .006-.007 depending on if the blocks ever been decked, yada yada.

 

honestly, the gain would be very little, and it's a complete waste of money, your ctr pistons is $180 for the set, and the rings set is $100....to install the b16a2 rods with the ctr pistons, you'll need your machinist to narrow down the small rod ends in order to fit with those rods.....or you can have your machinist open up the space between the piston pin holes....either way, you'll need the rods or the pistons rebalance.....so assuming your machinist charge you $50 to mod the rods or pistons, and another $50 for rebalance your rods or pistons.......So now, you're @ $380 to install some stock piston.........OR you can just pick up a set of aftermarket pistons with rings for about $400 with different compression to choose from, and if you're still not happy with the gain, now you can spray the **** out of the motor with those aftermarket forged pistons, just my $.02