MTFCA Forum

Engine in for a re-build, fitted with pistons from?? So what do you do if piston travel is too long and surpasses the deck. simple, just leave the top rings out.

Best guess: 292's

Wouldn't 292s be post-split skirt era?
( Do not order; the part will not fit.)

Installing some new T aluminum pistons is the way I would go. What kind of rods are in it?
It’s got later valves which is good.

I’ve heard of using 292 pistons. But what is the purpose. More compression or? Just wondering.

Looks like the top ring has been removed and its just a carbon groove now. The 292’s (Y-Block) debuted in 1954 and replacement aluminum T pistons may not have been available at that time. We all assume that modifications are current, but these type of swaps have been going on since the steam days. I have seen plenty of strange “fixes”, some pretty slick and others have Bubba’s QC stamp.

How bad are the cylinders scored from the carbon?

Hi Frank,
What doe's the rest of the engine look like? My brother-law has a A crank engine that has what looks like the same pistons. They have all the
rings on them so I think they come up evan with the deck. That would mean it has kind of low compression?
Craig.

A longer stroke would restore some lost compression with a flat top piston. Maybe they are Model A pistons. (?) Flat top pistons with a Ricardo head would work very well.

I have an A crank motor with 292 pistons. The top ring goes right to the deck edge. My block is stock height, or so.
In pix #2, it appears your block has been decked a good 1/8". This would explain the need to omit the top ring.
If I were going to re-use those pistons, I would remove the upper ring edge & chamfer to reduce the carbon collecting in the top land.

It's a 1916 and still with all DB rods and mains caps. the bore has been taken out to 3-7/8". The T hasn't been started for 25 years as it needed to be towed to get it started when cold, only had about 15psi per cylinder. I'd say it was done in the 60's as the head gasket still has the price on it in our old currency which changed in the mid 60's. Everything is a mess of excessive clearances and would require major dollars to repair back to specs. Surly a shade tree job in the first place as can be seen the piston skirt cut is facing the thrust side of the bore as well.
I have a far better block for this job. The T it's self is a very nice Canadian touring.

I have the same overborne on a 19 block. I was told at that big an overborne the pistons were likely Dodge Phoenix pistons, all they could get at the time. Otherwise resleeve back to standard and use available pistons

Allan from down under.

Yes Allan, sleeving was first option until the expense of other repairs, some crazy size valves in it, 7/16" stem + worn as well.