here's the thread I started about my motor blowing up at CMI.
https://honda-tech.com/zerothread?id=1942100

I felt I should start this thread to explain the cause of my motor failure and not put blame on the CP piston's design nor my tuners tuning ability. I didn't want to start a CP piston flame war and degrade their name. However, I would feel a little better if the the area that melted was just a little more beefier,that's just my opinion.

My fuel sump is facing foward, and since this run was my fastest run(127 from a 114mph) the pump sucked up air due to the fuel being pushed back.

Since I have a bank to bank ECU, the fuel feed and return starts and ends on #1 cyl. it's evident the fuel rail was losing fuel(1cyl getting the most 2cyl. just enough, 3cyl.not enough 4cyl.none at all).

Also, the spark plugs definitely tell the story. #1 plug looked normal, #2 showed signs of detonation, #3 melted electrode #4 melted electrode with oil(most severe).

So, I'll turn the sump around and call it a day.....of course after I put new pistons in the motor.

 

haha ive heard this B4, CP piston dont like detonation as do any piston, of coarse a severe case of it !

 

darren one of your pistons looks like that

 

i guess thats what happens when you take all fuel away in boost lol

 

for high powered cars 500+whp I'd recommend coating the pistons.

seen JE and CP melt a bit at the corners...yes tuning was conservative

try the coating.... you'll be surprised

 

had the same thing happen to mine also @ cmi....cp piston replace piston twice in a month. no more cp for me. the first time that happen #3 piston went out, now # 3 and #4 went out. same intake relief piston chip or crack. i even retune the car again after the first time it happen.

 

i had 2 sets of cps crack at the valve reliefs. new setup i pulled a set of 84.5 wisecos out for some 85mm wisecos and the old ones looked great . wiseco's for me from now on.

 

i usually run wiseco pistons

 

two seasons on cp pistons 600+ hp hundred passes or more

 

we've had the same set of 83mm cp's for about 2 yrs, a shiton of dyno pulls, over 40 runs on the track. they are lookin fresh (car makes over 800)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 94turboeg &raquo;</TD></TR><TR><TD CLASS="quote">two seasons on cp pistons 600+ hp hundred passes or more </TD></TR></TABLE>

What bore???

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dturbocivic &raquo;</TD></TR><TR><TD CLASS="quote">we've had the same set of 83mm cp's for about 2 yrs, a shiton of dyno pulls, over 40 runs on the track. they are lookin fresh (car makes over 800)</TD></TR></TABLE>

Try that with a set of 81mm pistons.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FUCATYPR &raquo;</TD></TR><TR><TD CLASS="quote">What bore???
Try that with a set of 81mm pistons.
</TD></TR></TABLE>

Why would 81mm be worse than 83mm?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LeGeND4LiFe &raquo;</TD></TR><TR><TD CLASS="quote">

Why would 81mm be worse than 83mm?</TD></TR></TABLE>

I think because the area around the valve relief is not as thick.

I have 81mm CP's and will be getting tuned later this week. I dont forsee any issues though.

 

i like to take out my pistons and put little rotaries in there.

 

we have dished out all the abuse we can at CP Pistons over the last 3 seasons and haven't seen any issues at all -- making 700+ whp, 30+ psi of boost -- never had a failure due to the CP's

CP's

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbo-charged &raquo;</TD></TR><TR><TD CLASS="quote">i like to take out my pistons and put little rotaries in there.</TD></TR></TABLE>

now your talking...

 

I have run both brands with no problems at all. Either brand is fine with me.

 

never had one problem with CP pistons. I have had a vacuum source come off the regulator during a pull on the dyno and didn't faze the pistons. 2 years on the same set 800+ here with plenty of abuse. wont change them out for anything.
James Innes is the man to buy these from he stocks alot of them.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by accordking &raquo;</TD></TR><TR><TD CLASS="quote">here's the thread I started about my motor blowing up at CMI.
https://honda-tech.com/zerothread?id=1942100

I felt I should start this thread to explain the cause of my motor failure and not put blame on the CP piston's design nor my tuners tuning ability. I didn't want to start a CP piston flame war and degrade their name. However, I would feel a little better if the the area that melted was just a little more beefier,that's just my opinion.

My fuel sump is facing foward, and since this run was my fastest run(127 from a 114mph) the pump sucked up air due to the fuel being pushed back.

Since I have a bank to bank ECU, the fuel feed and return starts and ends on #1 cyl. it's evident the fuel rail was losing fuel(1cyl getting the most 2cyl. just enough, 3cyl.not enough 4cyl.none at all).

Also, the spark plugs definitely tell the story. #1 plug looked normal, #2 showed signs of detonation, #3 melted electrode #4 melted electrode with oil(most severe).

So, I'll turn the sump around and call it a day.....of course after I put new pistons in the motor. </TD></TR></TABLE>

Sounds like a fuel set-up issue than a piston issue......and why is your sump backwards? You also stated that the person that tuned your engine, tuned it conservatively....do you know what the A/F was.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by accordking &raquo;</TD></TR><TR><TD CLASS="quote">here's the thread I started about my motor blowing up at CMI.
https://honda-tech.com/zerothread?id=1942100

Also, the spark plugs definitely tell the story. #1 plug looked normal, #2 showed signs of detonation, #3 melted electrode #4 melted electrode with oil(most severe).

So, I'll turn the sump around and call it a day.....of course after I put new pistons in the motor. </TD></TR></TABLE>

Maybe you should start a thread about how you wish NGK or spark plug companies made a better plug that did not melt.

It is very simple your fuel system and /or tune was/became incorrect!

If you melt a electrode or bust ceramic off the plug, your pistons never had a chance!
My point?.............why even bring CP into this issue?

 

The post about CP's gets real old! Just got off the phone with the person that made the post and of course, he admits the fuel system was not up to par and this caused the problem. Do you guys all think that the piston manufactures are making their own kinds of metal that 1 brand melts and the others do not? It's crazy...

If a motor is tuned correctly and all else is in running shape any piston should run, some better then others but will not melt unless detonated.

Coatings are a waste of time if you have the tune up correct. If you feel that you are gonna save a poorly tuned motor with this...think again. There are LOT'S of huge hp cars that run piston's with no coatings all day long. You can actually loose hp by coating tops of pistons and keeping too much heat in the chamber

 

Well we do some SPECIAL stuff to our CP pistons.......... we pull them out of the box and blow them off with air, then we clean all our finger prints off with glass cleaner. (The foam kind)

Then we proceed to install like normal people, this must be why we have never hurt a piston

This goes hand in hand with why we can run STOCK OEM HONDA oil pumps, and never break one.

PEOPLE when you are talking, instead of saying detonate, or dentonated, rattled, just say BROKE. Because that is EXACTLY what detonation will do to ANY, piston crank rod , sleeve job, etc.....




Modified by FMUNK at 10:09 PM 4/11/2007

 

maybe its cuz you guys have really good air up there...lol

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbo-charged &raquo;</TD></TR><TR><TD CLASS="quote">i like to take out my pistons and put little rotaries in there.</TD></TR></TABLE>

Why? Are you looking to haver something totally unreliable?

 

CP pistons are the best in my book. We have used them in our race car making over 1500rwhp with no issues. I use them in ever motor we build for customers and have never once had any issues with there pistons. to CP for making the best pistons in my book.