Don Terrill’s Speed-Talk

Just for example I will use a 500 hp motor at 6000 rpm. Any Hp there to be gained using floater pins or pressed?

A performance gain would come from a pin being lighter for sure , but as I don't think any friction reduction between a pressed pin or floater could be measured on a dyno.

Not sure how floating vs pressed fit effects the pin weight?!?
Any frictional gains would typically only be measured at high rpms.

So If the pins are say 20 grams each lighter could be something there.

econo racer wrote: ↑Tue Sep 10, 2019 3:46 pm So If the pins are say 20 grams each lighter could be something there.

.0001HP.

Don't forget to add 2-3 grams for the pin-locks again.

A good cold air intake will net more power more easily.
Or a well tuned timing advance curve.

Stand on the scale and weigh yourself, 9 times out of 10 people can afford to shed some weight... Going on a diet and exercising might make a bit more difference than the weight of a piston pin, just saying...

paulzig wrote: ↑Tue Sep 10, 2019 4:33 pm Stand on the scale and weigh yourself, 9 times out of 10 people can afford to shed some weight... Going on a diet and exercising might make a bit more difference than the weight of a piston pin, just saying...

it might even make more power with a heavier pin if it made the piston more stable and retain its shape.

MELWAY wrote: ↑Tue Sep 10, 2019 5:20 pm it might even make more power with a heavier pin if it made the piston more stable and retain its shape.

Shhhh. Don’t give away all our secrets. Lol. Yep, depending on the piston design and use some times a heavier pin can help keep the piston supported.

Paul

Ok I get it there is nothing to be gained. How did you know I am fat Just 30 lbs.

You could tell by the heavy writing.
reed

econo racer wrote: ↑Tue Sep 10, 2019 9:53 am Just for example I will use a 500 hp motor at 6000 rpm. Any Hp there to be gained using floater pins or pressed?

The only gain with floating pins is that you can take them apart a lot easier and faster.

Only disadvantage I see is when the piston rocks with a pressed pin it will not rock as easily due to the roughly double contact area.. could cause more scuff/heat on the skirt.

The higher the rpm the more pronounced that would be... heavier stock pistons make it worse.

Floating it tends to let the pin move in the rod, not the piston

Many times I've seen older builds with forged pRessed TRWs that have badly scuffed skirts .. mostly due too the way to tight pin clearance.

That definitely produces unwanted heat

Opening it up to .0007 to .001 is best

I am waiting for the dyno sheets showing that a lighter pin will gain torque and the resulting HP.

paulzig wrote: ↑Tue Sep 10, 2019 4:33 pm Stand on the scale and weigh yourself, 9 times out of 10 people can afford to shed some weight... Going on a diet and exercising might make a bit more difference than the weight of a piston pin, just saying...

This.

The general health of most in a given paddock is