cp piston wrist pin

hondah2b21 · 03-28-2010, 10:34 PM

hi i was wondering whats the max power made on a standard cp piston wrist pin.

im building a fully built h22 but i forgot to upgrade the wrist pin. i would hate for that to be my down fall on my build.

if this question is in the wrong location i apologize.

Mikey3000 · 03-29-2010, 04:51 AM

Nobody is going to have an answer that's worth a damn. Your best bet would be to call CP and ask what they're designed to handle.

hatch34 · 03-29-2010, 07:01 AM

a close friend of mine made 700whp on off the shelf CP pistons

narfdanarf · 03-29-2010, 07:35 AM

when I called CP and asked them they said between 5 and 600, but there are people on this forum making 1000ish on stock wrist pins...I personally have the upgraded ones just for peace of mind.

hondah2b21 · 03-29-2010, 08:40 AM

thanks guys.

my budget is on its final string so i think im just gonna run the standard wrist pin and get the car dialed in. then upgrade when my money back to par. gonna enjoy what i have for now. thanks again.

HybridKOOP · 11-25-2011, 02:33 PM

for those who have upgraded pins (primarily CP), did you have to hone out the small end of the rod and/or wristpin opening in the piston to add clearance? or did you just run the upgrade .180 wall pin in the standard piston and rod? Thanks!

Lou

gringotegra · 11-25-2011, 02:40 PM

On all of our engines, we have them Pin fit at the machine shop. Wiesco/JE/CP all of em. You'd be surprised how off some of them are.

ashtons300zx · 11-25-2011, 02:42 PM

Its usually just a thicker wall pin same outer diameter, inner diameter is smaller and the material is of course stronger. Why not just upgrade pins, its like 75 bucks more to upgrade wrist pins. I ran my standard pins to 650+whp without problems but im not chancing it with the new power goals of 800+, not much money for peace of mind.

cibao2ner · 11-25-2011, 02:57 PM

yea you always need rods hone at machine shop...they come tight....

HybridKOOP · 11-25-2011, 04:03 PM

Thanks guys. I was told by some popular vendors on here to just slide them in and run them without pin fitting. Anyone have a spec of what kind of clearance they should have? I'm running CP Pistons with their 9210 upgraded pins. Same outer diameter etc, just a slightly smaller hole in the middle. Thanks.

Lou

zakura R · 11-25-2011, 04:52 PM

My h2b made last year on 9.1 comp cp piston with stock wrist pin that they came with 831hp at 33psi never had any problem with it I will said that u will have to worry when u start making over 900hp plus just my opinion

carbon fiber coupe · 11-25-2011, 06:43 PM

i'd just save up the extra 150 and get the upgraded wrist pins

It's just a little piece of mind

boostedeg6-1 · 11-25-2011, 06:59 PM

Quote:

Originally Posted by hatch34

a close friend of mine made 700whp on off the shelf CP pistons

Hey, I think I know that guy your talking about... Oh wait, that guy was me haha!

I made 700/500 on stock wrist pins revving to 10200-10400 and beat the living hell out of the car, never had any problems. Wrist pins and pistons themselves looked great after 5k miles. Spun a bearing so got a chance to check them!

Reid@KAIZENSPEED · 11-27-2011, 05:13 PM

The wrist pins will outlast the off-the-shelf CP pistons at that RPM and power level. You'll eventually finds cracks at the base of the skirt. The non-strut design just can't deal with the abuse. The off-the-shelf pistons will last about a full season though... but when you're ready for a piston that really can deal with the abuse, we have these:

The underside looks like this... it's just an iphone pic but if you look closely you'll see the cracks in the corners of the skirt. Our HD piston has a strutted skirt to keep the skirt from flexing, cracking and collapsing.

JJsMotorsports · 11-27-2011, 05:28 PM

Those are some strong looking pistons Reid!

SPOOLINmatt · 11-27-2011, 05:36 PM

doesnt really make sense to me why they wouldn't manufacture the shelf version like that. People will still destroy it, but from melting rather than collapse.

HybridKOOP · 11-28-2011, 06:26 AM

Those pistons look sick. Much beefier.

For those who are wondering about pin fitting, I am sending my pistons, rods, and upgraded CP pins to my machine shop today. I'll let you know the results. I am thinking no change will be necessary as the upgraded pins slide smoothly (if not even looser) into the piston and through the rod than the shelf pins do.

Lou

zakura R · 11-28-2011, 07:58 AM

Quote:

Originally Posted by Reid@KAIZENSPEED

The wrist pins will outlast the off-the-shelf CP pistons at that RPM and power level. You'll eventually finds cracks at the base of the skirt. The non-strut design just can't deal with the abuse. The off-the-shelf pistons will last about a full season though... but when you're ready for a piston that really can deal with the abuse, we have these:

The underside looks like this... it's just an iphone pic but if you look closely you'll see the cracks in the corners of the skirt. Our HD piston has a strutted skirt to keep the skirt from flexing, cracking and collapsing.

Reid are those piston the hd wiseco ??? One 10.1 comp ????

HybridKOOP · 12-01-2011, 07:55 AM

Quote:

Originally Posted by HybridKOOP

Those pistons look sick. Much beefier.

For those who are wondering about pin fitting, I am sending my pistons, rods, and upgraded CP pins to my machine shop today. I'll let you know the results. I am thinking no change will be necessary as the upgraded pins slide smoothly (if not even looser) into the piston and through the rod than the shelf pins do.

Lou

FWIW, and for future searches that bring this thread up... I DID need to pin fit the upgraded CP pins. CP's tech told me that the upgraded pin is more ductile and needs a little "flex" or "give" compared to the standard pin. He suggested .001 to .0012 clearance in the piston hole, and .001 in the small end of the rods bushing (which is what my machine shop did for me.)

Lou

jsilva · 01-07-2012, 05:57 PM

Quote:

Originally Posted by boostedeg6-1

Hey, I think I know that guy your talking about... Oh wait, that guy was me haha!

I made 700/500 on stock wrist pins revving to 10200-10400 and beat the living hell out of the car, never had any problems. Wrist pins and pistons themselves looked great after 5k miles. Spun a bearing so got a chance to check them!

That must have been in the motor I bought from you but you never sent me right? The one you scammed me on. Man it either takes stupidity or ***** to come on here and still post about the parts that you scammed me on. Im still waiting for my $1500 refund and dont worry I wont forget about it either.

SLIM NOTHING · 01-08-2012, 01:19 AM

Quote:

Originally Posted by hondah2b21

thanks guys.

my budget is on its final string so i think im just gonna run the standard wrist pin and get the car dialed in. then upgrade when my money back to par. gonna enjoy what i have for now. thanks again.

dude the upgraded wrist pins for 1000hp+ from ipgparts.com are only $99.

rudebwoy · 01-08-2012, 04:13 AM

Quote:

Originally Posted by cibao2ner

yea you always need rods hone at machine shop...they come tight....

you DO NOT!!!! need to machine anything to run upgraded Wrist pins. the inside diameter of the upgraded pin is smaller therefore a thicker side wall, outer diameter remains the same as the standard pin. as stated earlier... I can associate it like this say you are running 24.5 slicks on 15" rims, an uprgade would be to run 24.5" slicks on 13" rims would give you bigger side walls without increasing the diameter of the tires. hope this helps.

MikeySpec · 01-08-2012, 07:35 AM

I went 760ish whp(dynojet) at 30psi for about 20-25 hits(including track+street passes). Then we we went 33 psi at the track once it ripped the wristpin right our of the piston and kabaaaam'd everything. It was CP's 11.5:1 shelf piston.......that was a bad idea.

MR.johnson · 01-08-2012, 08:16 AM

This is why I'm running diamonds this year.

03-28-2010, 10:34 PM	#1
hondah2b21 Honda-Tech Member Garage is empty, add now Join Date: Jul 2003 Location: newark, nj, us Posts: 87 iTrader Rating: (0)	cp piston wrist pin hi i was wondering whats the max power made on a standard cp piston wrist pin. im building a fully built h22 but i forgot to upgrade the wrist pin. i would hate for that to be my down fall on my build. if this question is in the wrong location i apologize. __________________ H2B Stock 198 HP 157 TQ H2B boosted in the works. 09 is mine... ok maybe 2010...

03-29-2010, 04:51 AM	#2
Mikey3000 Honda-Tech Member Garage is empty, add now Join Date: Nov 2001 Location: Lorton, VA Posts: 2,967 iTrader Rating: (0)	Re: cp piston wrist pin Nobody is going to have an answer that's worth a damn. Your best bet would be to call CP and ask what they're designed to handle. __________________ 92 Civic CX - Turbo H22A, 700+whp @ 29psi 10.42@144mph (148mph) Good folks: Joe Simpson@Tempest Racing, Jeremy Allen@InlinePro

03-29-2010, 07:01 AM	#3
hatch34 Honda-Tech Member Garage is empty, add now Join Date: Jan 2005 Location: bellevue, wa Posts: 2,345 iTrader Rating: (0)	Re: cp piston wrist pin a close friend of mine made 700whp on off the shelf CP pistons __________________ K-Serious! 990whp 600tq billet 6766 9.2@164 10.67@134 DD 2600lbs http://www.speedfactoryracing.net/ for all your go fast needs

03-29-2010, 07:35 AM	#4
narfdanarf Honda-Tech Member Garage is empty, add now Join Date: Nov 2004 Location: Miura-Shi, Japan Posts: 1,223 iTrader Rating: (0)	Re: cp piston wrist pin when I called CP and asked them they said between 5 and 600, but there are people on this forum making 1000ish on stock wrist pins...I personally have the upgraded ones just for peace of mind. __________________ Round 2 build

03-29-2010, 08:40 AM	#5
hondah2b21 Honda-Tech Member Garage is empty, add now Join Date: Jul 2003 Location: newark, nj, us Posts: 87 iTrader Rating: (0)	Re: cp piston wrist pin thanks guys. my budget is on its final string so i think im just gonna run the standard wrist pin and get the car dialed in. then upgrade when my money back to par. gonna enjoy what i have for now. thanks again. __________________ H2B Stock 198 HP 157 TQ H2B boosted in the works. 09 is mine... ok maybe 2010...

Welcome to Honda-Tech!
		Welcome to Honda-Tech.com. You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Honda-Tech community today!

11-25-2011, 02:33 PM	#6
HybridKOOP Honda-Tech Member Garage is empty, add now Join Date: Jul 2001 Location: Northeast, USA Posts: 6,026 iTrader Rating: (0)	Re: cp piston wrist pin for those who have upgraded pins (primarily CP), did you have to hone out the small end of the rod and/or wristpin opening in the piston to add clearance? or did you just run the upgrade .180 wall pin in the standard piston and rod? Thanks! Lou __________________ FS: OEM Civic 1992-1995 EG/EJ Coupe/Hatchback door skins. Brand new in the box from Honda. PM me!

11-25-2011, 02:40 PM	#7
gringotegra Honda-Tech Member 1994 Acura Integra Join Date: Feb 2005 Location: Vancouver, WA, USA Posts: 8,044 iTrader Rating: (0)	Re: cp piston wrist pin On all of our engines, we have them Pin fit at the machine shop. Wiesco/JE/CP all of em. You'd be surprised how off some of them are. __________________ 710whp@30psi 6262 E98 New setup 10.12@151mph, 11.57@137.48 Street tires Englishracing.NET\|Extreme Turbo Systems\| GSC

11-25-2011, 02:42 PM	#8
ashtons300zx Honda-Tech Member Garage is empty, add now Join Date: Oct 2005 Location: Yuma, AZ Posts: 746 iTrader Rating: (0)	Re: cp piston wrist pin Its usually just a thicker wall pin same outer diameter, inner diameter is smaller and the material is of course stronger. Why not just upgrade pins, its like 75 bucks more to upgrade wrist pins. I ran my standard pins to 650+whp without problems but im not chancing it with the new power goals of 800+, not much money for peace of mind. __________________ 1992 Nissan Sentra SE-R (B13) SR20VE-T, CP 9:1 pistons, Manley Turbo Tuff I-beam rods, ACL race bearings, Mazworx 1/2" headstuds, Mazworx PE headgasket, BMC race intake manifold, ID2000's, Weldon Fuel pump, Precision T4 6765, and much more.

11-25-2011, 02:57 PM	#9
cibao2ner Honda-Tech Member Garage is empty, add now Join Date: Nov 2007 Location: bronx, ny, usa Posts: 1,463 iTrader Rating: (0)	Re: cp piston wrist pin yea you always need rods hone at machine shop...they come tight....

11-25-2011, 04:03 PM	#10
HybridKOOP Honda-Tech Member Garage is empty, add now Join Date: Jul 2001 Location: Northeast, USA Posts: 6,026 iTrader Rating: (0)	Re: cp piston wrist pin Thanks guys. I was told by some popular vendors on here to just slide them in and run them without pin fitting. Anyone have a spec of what kind of clearance they should have? I'm running CP Pistons with their 9210 upgraded pins. Same outer diameter etc, just a slightly smaller hole in the middle. Thanks. Lou __________________ FS: OEM Civic 1992-1995 EG/EJ Coupe/Hatchback door skins. Brand new in the box from Honda. PM me!

11-25-2011, 04:52 PM	#11
zakura R Honda-Tech Member Garage is empty, add now Join Date: Mar 2008 Location: lowell, mass, usa Posts: 753 iTrader Rating: (0)	Re: cp piston wrist pin My h2b made last year on 9.1 comp cp piston with stock wrist pin that they came with 831hp at 33psi never had any problem with it I will said that u will have to worry when u start making over 900hp plus just my opinion __________________ Zakura h2b tune on s300 9.1@165mph 60s1.6 129mph in the 1/8 mile kinetic motorworks.com ,Dosky fab,!Zflow!

11-25-2011, 06:43 PM	#12
carbon fiber coupe Honda-Tech Member Garage is empty, add now Join Date: Nov 2006 Location: cincy, oh Posts: 1,190 iTrader Rating: (1)	Re: cp piston wrist pin i'd just save up the extra 150 and get the upgraded wrist pins It's just a little piece of mind __________________ VOUCHES: ruehl925..bokals..AZSTATEPOLICE..johnny G..MildWater..sgriffiths..nytosc..gizzmo555..clovi skilla..IlluSiv3 2013 (fingers crossed) sfwd race car!!!!!!!!!!!!!!!!!!!!!!!!!!

11-27-2011, 05:13 PM	#14
Reid@KAIZENSPEED Honda-Tech Member Garage is empty, add now Join Date: Apr 2001 Location: Northwest Tri Cities Kennewick, WA, USA Posts: 2,054 iTrader Rating: (0)	Re: cp piston wrist pin The wrist pins will outlast the off-the-shelf CP pistons at that RPM and power level. You'll eventually finds cracks at the base of the skirt. The non-strut design just can't deal with the abuse. The off-the-shelf pistons will last about a full season though... but when you're ready for a piston that really can deal with the abuse, we have these: The underside looks like this... it's just an iphone pic but if you look closely you'll see the cracks in the corners of the skirt. Our HD piston has a strutted skirt to keep the skirt from flexing, cracking and collapsing. __________________ *8.47@176 mph* The fastest H22 powered car in the world Check us out at www.KStuned.com

11-27-2011, 05:28 PM	#15
JJsMotorsports Honda-Tech Member Garage is empty, add now Join Date: May 2008 Location: san antonio, tx, bexar Posts: 1,221 iTrader Rating: (1)	Re: cp piston wrist pin Those are some strong looking pistons Reid! __________________ JJsmotorsports.net/Used b-series oem parts in stock!2004.5 Dodge Dually My Tow Horse 1995 Vx Hatch SFWD,Millertime Fuckin'em/T1/PTE/Dss/Noribilt/Motec/ FTWFuel/Golden Eagle 9.08@173.9.......IFO's FTW!!Best 60ft.1.46! On M&h tire 24.5 sfwd

11-27-2011, 05:36 PM	#16
SPOOLINmatt Honda-Tech Member 1999 Honda Civic Join Date: Mar 2004 Location: North Georgia/Atlanta Posts: 7,213 iTrader Rating: (0)	Re: cp piston wrist pin doesnt really make sense to me why they wouldn't manufacture the shelf version like that. People will still destroy it, but from melting rather than collapse. __________________ www.MSSRACING.com - 9.84@160 - Main Stream Performance / Competition Clutch / Arias Pistons / Mahle-Clevite Bearings / JKOBD.com / TDC Performance www.IMPORTSHOWDOWN.com

11-28-2011, 06:26 AM	#17
HybridKOOP Honda-Tech Member Garage is empty, add now Join Date: Jul 2001 Location: Northeast, USA Posts: 6,026 iTrader Rating: (0)	Re: cp piston wrist pin Those pistons look sick. Much beefier. For those who are wondering about pin fitting, I am sending my pistons, rods, and upgraded CP pins to my machine shop today. I'll let you know the results. I am thinking no change will be necessary as the upgraded pins slide smoothly (if not even looser) into the piston and through the rod than the shelf pins do. Lou __________________ FS: OEM Civic 1992-1995 EG/EJ Coupe/Hatchback door skins. Brand new in the box from Honda. PM me!

01-08-2012, 07:35 AM	#23
MikeySpec Honda-Tech Member Garage is empty, add now Join Date: May 2001 Location: Chicago, IL, USA Posts: 3,254 iTrader Rating: (0)	Re: cp piston wrist pin I went 760ish whp(dynojet) at 30psi for about 20-25 hits(including track+street passes). Then we we went 33 psi at the track once it ripped the wristpin right our of the piston and kabaaaam'd everything. It was CP's 11.5:1 shelf piston.......that was a bad idea. __________________ Pro Function http://www.profunctionauto.com http://www.ProFunction.FreeForums.org

01-08-2012, 08:16 AM	#24
MR.johnson Honda-Tech Member Garage is empty, add now Join Date: Feb 2007 Location: in the sticks Posts: 4,114 iTrader Rating: (0)	Re: cp piston wrist pin This is why I'm running diamonds this year. __________________ Dynotuned l Bailey Motorsports l Boss&Sons LLC l Synchrotech-transmissions 9.725@154 www.facebook.com/BryanBuiltTransmissions

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Honda and Acura Technical Forums

cp piston wrist pin