The Stovebolt Site Forums The Shop Area The HiPo Shop Diesel engine pistons in a stovebolt?

I believe I've found another parts swap that might benefit people who are building up a 261 engine. Pistons that fit a Nissan forklift are very similar to ones for a 261 engine, and they're designed to be used with flanged, slip-fit sleeves so the block never has to be rebored again. The same piston/sleeve assemblies can also be used in modified 248 and 270 GMC engines with a longer stroke crankshaft. Yes, the wrist pins are way too big, but that's fixed easily by putting bronze bushings in the piston pin bosses.

www.ebay.com/itm/195096233829?

www.ebay.com/itm/403393893525

I can get 3/8" extra stroke from either the Chevy or GMC crankshafts by sleeving the connecting rod bores down to a smaller diameter, offset grinding the crankshaft, and using a connecting rod bearing for an Allis-Chalmers tractor. That brings the Nissan pistons almost to the top of the block.
Jerry

Wow Jerry.

I guess the only way to see if it is better is to throw one together.

It's on the project list- - - -already got most of the parts on hand. Just got to find time to do some whittling on a block, crankshaft, rods, etc. The upside is that after all the modifications, the rebuilding parts will be 50+ years newer than the ever-shrinking supply of original stuff- - - -and the engines will look the same from the outside. On the round track circuit we called things like that "sleepers"!
Jerry

Since a "Cadillac 261" has Caddy pistons in it, I guess in this case it can be dubbed as a "Nissan 261".

Or maybe just tell people the Nissan folks got jealous since Toyota used the 235 for a while so they decided to one-up them in displacement.

Toyota borrowed (stole?) heavily from the stovebolt engine design, but parts don't interchange. Back when Nissan went by the "Datsun" name, the 1500 CC engine for one of their 2-sesater sports cars was a direct copy of an MG engine- - - -I've swapped an MG cylinder head onto an early 1960s Datsun "Fair Lady" engine.

Those Nissan Diesel pistons and sleeves can also be used in GMC 248 and 270 engines with an altered stroke crankshaft. The 270 goes to almost 300 cubic inches with a 4 1/8" stroke and 270 blocks are a lot easier to find than 302s. I'm gathering up parts to build a 248 stroker, using rod bearings for an Allis-Chalmers tractor engine.
Jerry

Here's the Toyota Stovebolt.

It's too bad parts aren't interchangeable between the Toyota and Chevy versions. There' s a lot of aftermarket support for the Toyos.

I wonder haw difficult it would be to transplant the entire Toyota drive train into an AD truck?

Otto, I wouldn’t want to do that. I’ve worked on a Toyota Land Cruiser. What a pain!!

Yes, but they have a following like Mustangs so new parts are plentiful.

Interestingly, the first Toyota straight six was based on the 1929-1936 207cid engine rather than the Chevy 216/235cid. The later iterations of Toyota's Stovebolt were based on the 1939-1963 GMC 236cid

For the record, Toyota paid licensing fees to General Motors for the design.

There was also a Japanese version (almost a clone) of the Harley Davidson flathead V-twin motorcycle, manufactured in Japan pre-WW II. I believe it was either the 61 or the 74 cubic inch version. I saw one when I was stationed on Okinawa 1970-72.
Jerry

I've heard about that. The Japanese were known for jump starting their industry by copying proven designs. The very first Toyota produced, the 1937 Model AA, is a nearly identical copy of the 1935 DeSoto Airflow.

We are kind of veering off into Spoon territory here. If there isn't any more feedback to Jerry's original observations, maybe we should pick this up over there.