Piston Rod Failure

[Mitsuboyee]

Ok so I did a compression test and it came up 100psi across the board. There was never a lack of power or smoke out the tail pipe...My coolant temp was always up there under boost. I was thinking since I recently installed a new big turbo 60-1 maybe there's just more heat being made under boost. Bare with me I am new to this. SO after taking the head of the car the piston from the top while still in the block looked in tack. I took of the oil pan gave it a crank check and it moved about a little just barely. I remove the #1 piston the bearings looked worn... I remove the #4 ...The rod came out like a banana.

I would like to know how did that happen and how the hell my motor was still making power under these conditions.

I need direction now to get back to the track for spring... I am leaning toward a 1G block but using my 2g Head its ported. Buscher has a bullet proof block with pistons and rods for $3000, or should I just get a stock block and build it...Please someone Help me think...

Look at the pics...of the cranage..

 

[psychlow]

Well, that's certainly not a very drastic bend. I've seen much worse!

As long as you still have some compression, you can still make power. In your case, your rings would still seal just fine, so you weren't leaking combustion pressure down past the rings. Your lack of compression came from the piston not traveling to the top of the bore.

You just ended up with a 6:1 compression ratio or something like that (way too lazy to calculate it right now). Seems odd that all cylinders would be 100PSI, though - are you sure the timing was correct?

 

[blackGSX2g]

Well, that's certainly not a very drastic bend. I've seen much worse!

As long as you still have some compression, you can still make power. In your case, your rings would still seal just fine, so you weren't leaking combustion pressure down past the rings. Your lack of compression came from the piston not traveling to the top of the bore.

You just ended up with a 6:1 compression ratio or something like that (way too lazy to calculate it right now). Seems odd that all cylinders would be 100PSI, though - are you sure the timing was correct?

Yea, at least it didnt' break off and destroy your block. At least you can salvage it still.

The compression does seem odd...its about 78psi shy of normal. Check the timing and chec to see if you have any bent valves.

 

[Mitsuboyee]

ok so my pistons are bad do i go get a 1g motor?

 

[psychlow]

Yeah, I'd start thinking about a 6-bolt swap, especially with a 60-1.