Where do your pistons melt??

[R/T]

Seems all the melted / cracked pistons we have here at Repo Man Labs are damaged on the *back* side....

Why??

I think a crack starts, the edges become hot spots, and the rest is history.

Hozabout yours??? :p

[3Bar_Mopar]

The last two I cracked...one was on the back and one was on the side skirt.

[GLHSKEN]

Always the 4-5 O-clock position...

[Chris Faulk]

I've only broken ring lands on a stock car.

The breaks are in the back oriented on the same side as the valve relief cuts.

[jckrieger]

Mine usually break on the back, but a previous owner melted them on the back side as well. Russ Jerome took out the back of his block, so he had problems there as well :). On my Daytona, I once melted the whole top of the piston at once, but it burnt through on the back side once it completely failed.

[shelbyplaya]

one of them i cracked the ringland off and the rest melt all over.. when i melt a piston i go all out!

[turbovanman²]

2 seperate engines, I melted them at the back, aprox 10 and 2 oclock.

[deuce dodge]

ringlands

deuce

[lametec]

3 out of 3 that I have here (one melted, two cracked) were at about 2 o'clock.

[David Bohrer]

On 8 valve heads:
7 melted on the back
3 melted on the sides but, still towards the back
2 aluminum potatoes
1 melted on the front damn Super 60 ground switch
15 cracked (various locations)
at least seven sets of blown rings

On 16 valve setup:
11 cracked in various locations
ZERO melted
5 sets of blown rings come to mind

don't even ask me about headgaskets....:eyebrows:

[R/T]

On 8 valve heads:
7 melted on the back
3 melted on the sides but, still towards the back
2 aluminum potatoes
1 melted on the front damn Super 60 ground switch
15 cracked (various locations)
at least seven sets of blown rings

On 16 valve setup:
11 cracked in various locations
ZERO melted
5 sets of blown rings come to mind

don't even ask me about headgaskets....:eyebrows:

DING!! DING!! DING!!!

We have a winnah!!! :lol:

[CanadianDaytona]

back
http://www3.telus.net/canadiandaytona/piston.jpg

[Stratman]

Have any of these stated been forged pistons? How many J.E., Vinolia, ect... ?


DING!! DING!! DING!!!

We have a winnah!!! :lol:

[turbovanman²]

On 8 valve heads:
7 melted on the back
3 melted on the sides but, still towards the back
2 aluminum potatoes
1 melted on the front damn Super 60 ground switch
15 cracked (various locations)
at least seven sets of blown rings

On 16 valve setup:
11 cracked in various locations
ZERO melted
5 sets of blown rings come to mind

don't even ask me about headgaskets....:eyebrows:

Remind me not to let you tune my van, :lol:

[cordes]

Remind me not to let you tune my van, :lol:

Simon, you owe me a new keyboard.:lol:

[David Bohrer]

You guys kill me! i can tune YOUR van/car with much more restraint than how I treat my own car. Ken knows of my self control :D . I have a box of memorable dead unit around here somewhere...


In the begining it was ignorance of physics that killed the first few and then I went to college and started turning wrenches for a living and began to learn. I must state that I deliberatly killed the rest of these pistons and rings so that I knew exactly where they failed at. I don't like to guess, I want to know. That is how I got my car to run 7.41@99.35 in the eighth mile on cast T2.5 pistons in a 2600 pound car. (7.2 compression, 28 psi , 96 octane, 10degrees of timing and a 52 shot of nitrous)

But, as for the pistons ALL of them were cast. My current set of pistons are forged and i treat them with a moderate amount of respect. Not too much just enough to keep them around. Kinda like my woman!;)

[GLHSKEN]

LOL Yep, Dave has self control and a very efficient vacuum line set-up hehehe

[David Bohrer]

Everyone LUVS my way of doin' vacuum lines!

[TrrboJeep]

In the cylinder! :bump2: lol

Actually mine never melted, just cracked and broken ring lands.
(which is probably a precursor to melt down) :eyebrows:

[DUGZSHELBY]

Ive only cracked and melted two so far "2 seperate times just above the piston pin". Both were dead center of the upper ring end gap. In the future I think it wise to position the upper comp ring end gap AWAY from the valve reliefs cut into the pistons to a thicker spot. Anyone else notice this?

[Alberta_Daytona]

back side...only melted 1 so far....but im new...so I have many to destroy yet.

[shadow88]

5 of them broke ring lands, all at the back. The one that's in there now has been driven all year broken. So it may be getting a picture. All were hyperutectic.

[deuce dodge]

well add sides holding wrist pin clips.........sigh

2 melted retainer clip groove.........wham shot block............funny melted pistons........way to go eric..lol

how to drive a td.........max boost and floor it..........:)

deuce

[Stratman]

LOL, it would be a good amount of info to find out how much boost everyone was pushing at the time :)


well add sides holding wrist pin clips.........sigh

2 melted retainer clip groove.........wham shot block............funny melted pistons........way to go eric..lol

how to drive a td.........max boost and floor it..........:)

deuce

[turbovanman²]

12-20 psi, :censored: