Don Terrill’s Speed-Talk

the top ring won't be coming out of the top of the block!

This is a teaser!

DV

I am going to guess no rings involved. The rod looks like a stretched 70's vintage smallblock rod.

Carnut1 wrote:I am going to guess no rings involved. The rod looks like a stretched 70's vintage smallblock rod.

Charlie,

All the rings will be in the bores. You are right about the rods - 2 chopped 350 rods welded togeher.


DV

I hope that rod was x-rayed and heat treated after welding. Interesting experiment.

I always liked the longer rods, I did a small journal 391 chevy with 6" eagle H beam rods. 3.825" stroke I think, made for a very short piston with the pin in the oil ring. I really don't see how that long a rod can be made to fit a 9" deck and a 3.48" stroke. Thanks, Charlie

Hmm.... At first I was thinking grooved pin buttons, but now I am wondering if the wristpin tolerance was tight enough you could put the rings UNDER the pins. Or maybe just some grooves for O-rings, the piston and pin wouldn't get hot enough to affect some of the higher temperature O-ring material and there'd be no flow through the area so any gas there would be stagnant anyway.

the advantage of the long rod is weight saving in the piston. the ratio is 2 to 1 for 1 gram of weight you add to the longer rod you save 2 grams in the shorter piston

I would not trust it as far as I could throw it. Going to be using a .25'' thick copper gasket?

Interesting math; check me here, but an 8.1" rod and 1.74" of stroke = 9.84"; can't stay under a 9.025" OEM SBC block deck, so that's already .815" out of the deck before we consider the piston and rings?

I'm thinking it doesn't have a traditional wrist pin but rather some kind of captured ball and socket arrangement right under the Piston deck maybe theres a hole in the piston deck and the pin goes on top. I think I've got it. the deck of the Piston splits with the top cap unbolting and reinstalled after the rod and pin are in place

BigBlocksOnTop2 wrote:I would not trust it as far as I could throw it. Going to be using a .25'' thick copper gasket?

Trust me here but these rods will survive the peak rpm involved for at least 500 hours. Also no head gasket involved.

Sure...... A stock "350".

But a 350 what?

Might be a 350ci twin cylinder engine that turns less than 2000rpm.

PRH wrote:Sure...... A stock "350".

But a 350 what?

Might be a 350ci twin cylinder engine that turns less than 2000rpm.

Good try PRH but no it is a 350 Chevy block 9.025 height.
DV

I'd love to see some information about the welding job...

ive no idea how you can squeeze that long a rod in a stock 350 block without talking something like a 9.5" block with about a 3" stroke crank, maybe even a shorter stroke, and just a big bore...idk. an 8.1" rod in a 9.025deck block dont leave much room for piston pin height nor any kind of stroke on the crank.