moregrip

iTrader: (8)

Need a sanity check on my math:

Since there are "stocked" pistons made for a 4" stroke Crank using a 6.125" Connecting Rod.

Shouldn't I be able to run those pistons with a stock stroke crank(3.622") and a 6.314" connecting rod or there abouts?

Okie5.3

iTrader: (1)

right on the money, assuming a measured DH of 9.245". you'd be looking at what a 71% rod/stroke ratio.

moregrip

iTrader: (8)

cool, thanks for the math check

TurboGibbs

iTrader: (6)

You could run a 4.8 rod (6.285) and deck the block .030 and have the same thing for a lot less money.

vanillagorilla

iTrader: (1)

To tell where the piston will wind up in relation to the deck, I always use deck height-1/2 stroke-rod length-comp height. + number= out of the hole, - number= in the hole, 0=zero deck.

So with the two compression heights being the same:
9.245"-2.00"-6.125"-X=9.245"-1.811"-6.314"-X

You are correct sir, but where are you going to get a rod with that exact length? Custom? Titanium perhaps?

TurboGibbs

iTrader: (6)

That is why I suggested the 4.8 rod.
A custom set of pistons and stock rods would be a lot cheaper than pistons and custom rods of course as well.

vanillagorilla

iTrader: (1)

Those would put him about 0.029" in the hole, assuming the off the shelf stroker pistons are at zero deck with the 4" stroke/6.125"rod combo. It'll drop his compression ratio quite a bit too.

mattrem

iTrader: (7)

The 4.8 uses a longer rod? interesting.

Okie5.3

iTrader: (1)

that would leave him with a CH of only .93". that would make for a lightweight piston that's for sure. wouldn't you run into some piston rock unless tolerances were dead nuts on???

TurboGibbs

iTrader: (6)

See post #4.

"wouldn't you run into some piston rock unless tolerances were dead nuts on???"

The length of the skirt controls that.