KB Piston Question Options

[Dave Bell]

Anybody know how to tell the correct orientation for installing the KB Pistons? I can't tell from looking at them which direction is supposed to be facing the flywheel.

Only documentation talks about the ring gap settings... nothing on orientation.

See photos below

[Dave Bell]

Thanks for info on orientation Jake and Brett

I have the instructions about modifying the lower oil ring to clearance for the 1/16" roll pin.

After reading through their instructions again.... it looks like they want you to take off 0.065 from the "unmodified oil ring.

Rings are Hastings and the oil ring expander seems to fit nicely over the roll pin as well

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These pistons are a work of art. They came through Demello who did a 78mm crank with Chevy rod journals for me.

On my scale... supposedly accurate to 0.1 grams.... the pistons with wrist pin fall within +/- 0.5 grams of a central value of about 481 grams. Piston about 382 grams and pin 99 grams.

Compare that to a 2.0 bus piston I have laying around... 424 grams for the piston and 168 grams for the pin...

My old 1.8 pistons weigh over 500 grams and the pins are 190 grams.

That's over 30% piston and pin weight reduction compared to the 1.8L set up.

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I am in nooooo hurry... still waiting for some bearings and I have not even mocked anything up to start checking deck height.