Too much compression

[DBChoppers]

We where experimenting with our new Reverse Vortex cylinder heads with a 92% exhaust flow ratio and I think we have to much compression for this set up. We are working with GMR on our new Landslide heads maybe they will work better and lay down some magic numbers on the dyno without any damage.

[arealinvestor]

Well at least you know you have good rods that held up!!!! They don't look touched at all!!! Lol!!!

[TXCHOP]

Cast eh'...........

So, how bad was it pinging before she blew.....

[aharp]

nice piston to valve clearance

[BVBOB]

Looks like the intake valve was fly cutting its own valve relief, or cutting it on the fly as the case may be, what brand pistons, how much comp?
btw, I want to hear more about those "landslide" heads

[TXCHOP]

Bob if i were guessing, they look just like s/e high comp cast pistons....

[DBChoppers]

The intake valve hit the piston because some piston debris stuck between the intake valve and seat and yes cast pistons.

[hdryder]

Yeah they are the cast 10.25:1 se's. You can see part of the word eagle if you look hard.

[Hillside]

I'd bet the reason the intake valve was in contact, was that the piston totally collapsed, and lost stability, and was dancin' around in the hole like a one-armed paper-hanger with a case of the crabs.
I would suspect that a forged unit, may be the way to go, if setting a course into uncharted waters, but that's only me.
Looks like a real nice mess other than that.
Have witnessed forged pistons pull the top ring land, on the intake valve side on engines that either too much timing was used, or when the compression was up too much.
You can tell when machining a cast piston, that they are nothing but shiney bubble gum. Betcha' they are cracked and split, if looked at closer.
Carnage is always interesting.
Scott

[hightop]

Originally Posted by DBChoppers

The intake valve hit the piston because some piston debris stuck between the intake valve and seat and yes cast pistons.

If that was the case I would expect contact down in the relief, not at the top. The SE cast pistons won't support a 1.9 " or larger valve without increasing the radius of the eyebrow, not the depth. From the pics it doesn't look like it was done, both reliefs look to be the same size.

What size valves do these heads have? I'd like to hear more about them.

And I agree with Hillside, carnage pics are always cool, unless it's your carnage!

[johnsachs]

First rule of thumb...Valve pockets need to be SPREAD on all CAST SE pistons,dome or flat.They don't look like that was done.
Maybe the intake valve got tweeked,causing an air leak,and a super lean motor,which self destructed from detonation.Just IMO.
John

[aharp]

Originally Posted by hightop

If that was the case I would expect contact down in the relief, not at the top. The SE cast pistons won't support a 1.9 " or larger valve without increasing the radius of the eyebrow, not the depth. From the pics it doesn't look like it was done, both reliefs look to be the same size.

What size valves do these heads have? I'd like to hear more about them.

And I agree with Hillside, carnage pics are always cool, unless it's your carnage!

TRUE DAT!!!

[LE PEW]

Why are the rods and pistons facing different directions? They're not still in the bottom end are they?

[springer-]

Originally Posted by LE PEW

Why are the rods and pistons facing different directions? They're not still in the bottom end are they?

Same piston in both pictures just a different angle

[robertlee]

What I'm seeing is piston tops turning bright orange/yellow while running, then melting off due to too high compression/heat/too advanced timing. Look at the edges of the damage. Excessive heat melted the material, and it disintegrated.