TRW 2211 pistons

[Timothy B.]

I have a OLD set of TRW pistons that have the stamping 2211 inside and I can't seem to find specs on them. I don't know if the pistons were modified but the rods are full floating with these pistons. If someone has a old book I would appreciate any info.

Thanks very much, Tim Barbieri

[Duke W.]

Re: TRW 2211 pistons

Very high compression 327 - 1.675" compression height, .325-380" dome, 14.6-16.8 cc net dome volume (depending on diameter), sold with either pressed or floating pins

CR around 12:1 with 64 cc chamber, nominal deck height, and .038" head gasket - a little over 10:1 with a 76 cc chamber

Duke

[Timothy B.]

Re: TRW 2211 pistons

Thanks Duke, Is it OK to clean them with a glass beader there slightly used and have been sitting for some time?

[Duke W.]

Re: TRW 2211 pistons

No I would not glass bead them. If you plan to reuse them maybe dressing the skirts with Scotbrite is as far as I would go, scrape carbon off the crowns, and clean the ring gaps with a ring gap cleaning tool.

Skirts have a very specific surface finish that is designed to retain oil and glass beading this surface will alter it - very likely for worse.

The domes can possibly be turned down to reduce CR. Depends on whether the dome just adds to total crown thickness or not. You can tell by looking at the bottom side of the crown. If its contour is fairly flat, the domes can be turned down. If it bottom surface follows the dome contour, then turning the dome down my leave insufficient crown thickness.

Duke

[Clem Z.]

bead blasting the TOPS ONLY will help carbon

form to the top which will generate more HP by forming a barrier layer to hold the heat in the combustion chamber. not as good as a thermal coating but it helps. never bead blast the ring grooves.

[Timothy B.]

Re: bead blasting the TOPS ONLY will help carbon

I think I will just soak in gunk and use scoth brite pad lightly. They are in very nice condition with little wear, probably build a heck of a motor with the right heads and cam.