What kind of piston is this?

[Unitedstatesofamerica1]

 

[Tony in SC]

Without knowing the exact measurements I'll say kinda small, high compression, probably 2 cycle, dirt bike or boat. Tony

 

[mick56]

My guess is from a chainsaw. You would probably need to find some numbers on it to find out what it fits. If I had that, I would run it in my rock tumbler for a while to clean it up. Maybe there are some numbers inside the piston.

 

[Carolina Tom]

The top is popped up, which means high compression to me. Way too small for what I am familiar with... American V8 stuff.

Good luck!

 

[Tony in SC]

My guess is from a chainsaw.

With a 2" dia. could be a chainsaw. Tony

 

[tamrock]

I'm thinking it came out of a 4 stroke with a side by side OHV configuration. I'm thinking a proformace piston for maybe an MG, Triumph TR3 or 4. Most small motorcycles 4 strokes are hemisphere OHV. On 2 strokes there's no need for the high top, because of no valves in the combustion chamber.

 

[H-D 1]

Could be an air compressor piston it only has two rings and doesn't appear to have an oil ring. They usually don't use oil rings because they don't deal with ignited gases. Only air

 

[DCMatt]

I'm thinking it came out of a 4 stroke with a side by side OHV configuration. I'm thinking a proformace piston for maybe an MG, Triumph TR3 or 4. Most small motorcycles 4 strokes are hemisphere OHV. On 2 strokes there's no need for the high top, because of no valves in the combustion chamber.

Too small for an MG. I owned and maintained several of them over the years.

I always follow that statement by saying, "If you want a really great car, don't buy an MG."

But they sure are fun to drive...

 

[tamrock]

Does it have any I.D. markings on the top ??

 

[mick56]

Since there is no oil control ring, it's probably out of a 2 stroke engine.

 

[DCMatt]

Without knowing the exact measurements I'll say kinda small, high compression, probably 2 cycle, dirt bike or boat. Tony

Tony is on the right track. Here is a piston for a Yamaha 250 motorbike. It is 48mm or about 2 inches in size.

 

[DCMatt]

I'd tumble and polish it to make a cool shifter knob for my truck.

DCMatt

 

[mick56]

I'd tumble and polish it to make a cool shifter knob for my truck.

DCMatt

Ala Milner in American Graffiti.

 

[tamrock]

Too small for an MG. I owned and maintained several of them over the years.

I always follow that statement by saying, "If you want a really great car, don't buy an MG."

But they sure are fun to drive...

I just can't see that coming out of any motorcycle made with in the last 50 years. Those I've had over the years and took em apart and put em back together. I guess it would be a bit small for most car engines, but the BMC 803 has a bore of 58mm = 2.283 in., so that would be close. It looks old also. I say we need a very accurate diameter in order to pin down for sure what this possibly came out of...(This tape measure set by isn't an accurate way to determine the size)... We don't have a clue if it came out of a 1,2,3 or 4 cylinder??. If you divide the 4 cylinders out of a BMC 803 which is 803cc total displacement each cylinder would be under the cubic centimeters of a Yamaha 250 at only 200.75cc in each cylinder. Indeed there were lovers of their MG's, Triumph's and Sunbeam's in the 60's and 70's and I knew a couple fellas who always did what they could to get more out of those dinky little engines. I have had the desire to own a TR-6 after I took one for a drive once. To me, there was and still is no better, practical and powerful engine then the small block Chevy V8. I've taken a handful of those apart to beef-up also.

 

[Tony in SC]

By the looks of that rod, what ever it came from has a hole in the side of the block. Tony

 

[nhbenz]

West Bend had some small engines with a 2" bore and some of those had a very similar piston: VINTAGE WEST BEND ENGINE GOKART MOTOR PISTON & CONNECTING ROD 580 / 510 (03/03/2013)

 

[mascotwoods]

Early 2 cycle. Something like a maytag washing machine engine.

 

[tamrock]

Could be a small two stroke?? I just couldn't think of any kind of two stroke high top piston until nhbenz offered the possibility of the west bend go-cart engine. I don't know about the diameter of a two stroke Maytag engine, but I do know they weren't any good for a go-cart. A friend of mine built a go-cart with a Maytag engine he got from a farmer. The only problem was the go-cart would only move forward as long as no one was on it.

 

[Tony in SC]

I had said small 2 cycle. cmawiant mentioned Maytag, Bingo!! I have different Maytag engines apart in my shop. It's the same piston that's in a Maytag 2 cylinder model 72. It could have been used in other engines, but the model 72 is the exact match. There is one on YouTube I know, but I'll try to get a pic tomorrow. Tony OOPs I didn't look at Tamrocks post before mine, but that's a Maytag model 72

Early 2 cycle. Something like a maytag washing machine engine.