Inliners International Forums General Discussion Engines 292 piston skirts

Hi All,

My machine shop ordered a set a .030 over 292 pistons for my block. I figured they would have the skirts like all the other 292 pistons I have seen, but they don't. They are the H909P Sealed Power (Hypertechnic?). Are these okay to run in a mild 292 mainly used for towing? Should I go with something else? It's not assembled yet. I know the Leo Santucci book advises against skirtless pistons for 292s due to cylinder bore stress. Any input is appreciated. Thanks.

can you post some pics of them.
with the 292 having such a large pin offset from the deck , you are limited on piston choices.

he mentions not to use pistons with the slipper skirt design. is the top ring land real thick like a stock piston? tom

http://i191.photobucket.com/albums/z280/pvgeos/Latest%20Projects/pistons001.jpg

http://i191.photobucket.com/albums/z280/pvgeos/Latest%20Projects/pistons002.jpg

Yeah, the top ring looks thick like a stock piston.

Any thoughts on this subject anyone?

Looks like it has plenty of skirt to me. But then I guess it all depends on how small a skirt area you get to before you call it a slipper.

Those appear to be the low compression OEM type piston. I don't know how mild a build you want. That piston will get you about IIRC 7.6 compression ration. It has the full dish in the top of the piston. If you want a little more compression there is a 'D' shaped dish for about 8.3, and there is a LPG piston for about 9.0. The LPG is 'D' shaped also but about half the depth. Those compression number are for a stock motor, nothing off the head or deck.

Larry

Ok, I guess I was confused on what a piston's slip skirt is. My concern was that the bottom of the piston is not completely round like other 292 pistons I have seen.

Also, does anyone have current part numbers for the LPG 292 pistons?

AFIK the LPG pistons are only available from Federal Mogul and the number is 980P.

I think what is confusing you on the skirts is the length. I'm not sure how far the skirt needs to extend under the piston pin to be considered a skirt. If that makes sense. There is a full skirt, which I believe the 909s are, and a slipper skirt. The slipper skirts are cut away under the piston pins holes.

Larry

Summit sells them. FEM-980P60 That is the number for the .060" and they have .020, .030, and .040". Summit calls these the Sealed Power/Federal Mogul LPG pistons. The dish is "D" shaped and only .150" deep as opposed to .310".
That full round dish you have, all but eliminates the quench effect.

Summit also sells the H909P and uses the name Speed-Pro Hypereutectic Pistons for them.

It has been several years, but my machine shop got the FEM980P60 pistons for me for less than I could find them anywhere else. You haven't pressed the pins in yet so I would hope the shop would get the other for you if that is the way you want to go.