Board index Flathead Power-Technical Questions, Answers, and Suggestions Big Twin Flatties Pistons

Pistons

Moderators: Curt!, Pa

Post Thu Jul 09, 2009 11:39 am

Posts: 7
Has anyone ever tried Briggs and Stratton pistons in a flattie. I removed one from a 10 hp riding mower, miked it, stuck it in a 13 fin jug, looks like it would work in a stroker with the deck height. In the briggs engine, it is running in an aluminum cylinder (no liner) with steel rings. From my calculations, stroke would be about 4 7/8. Whadja think?

Post Thu Jul 09, 2009 1:05 pm
panic

Why do I bother to ask questions, when no one reads anything?
Last edited by panic on Fri Jul 10, 2009 9:11 am, edited 1 time in total.

Post Thu Jul 09, 2009 10:00 pm

Posts: 391
Why bother when U pistons are available??
Robbie

Post Fri Jul 10, 2009 6:19 am

Posts: 1671
Location: Interlaken, NY USA

Having built a couple of BT strokers, I know I stopped at 4.5" stroke because of the difficulty of coming up with a stroker piston for longer strokes. I Might have gone further if I'd known the Briggs would work. Ah, the road not taken.(The faster road not taken)
DD

Post Fri Jul 10, 2009 1:43 pm

Posts: 7
I forgot to mention that the wrist pins were the same as Corvair, with easy circlips to install. Why use these rather than aftermarket Jap or Chink recycled Alpo cans? PRICE QUALITY, etc. As easy to install as Keith Black Corvairs. I have no idea on how piston to wall clearance should be set up. Eventually, I'm going to try them, so I guess my motor will be the Guinea Pig if no one beats me to it.

Post Fri Jul 10, 2009 1:49 pm

Posts: 7
Frankenstein wrote:
Having built a couple of BT strokers, I know I stopped at 4.5" stroke because of the difficulty of coming up with a stroker piston for longer strokes. I Might have gone further if I'd known the Briggs would work. Ah, the road not taken.(The faster road not taken)
DD

Evo (3.5 060 over ULH) Corvair, etc is all I have dealt with, as far as pistons for the big 80 go. What have you tried?

Post Fri Jul 10, 2009 1:51 pm

Posts: 7
panic wrote:
Why do I bother to ask questions, when no one reads anything?

Please explain. I'm kinda dumb, living in a garage full of motorcycles

Post Sun Jul 12, 2009 2:21 am

Posts: 93
Location: Norway
Can you messure bore, compression height and piston pin diameter for this B&S-piston? And engine type/serial-number might be useful.

VW 1600cc piston might work for someone too. Bore 85.5mm, compression height 39.4mm and piston pin diameter 22mm. Availiable in both cast and forged for very reasonable money.

Never mind the panic!
Torstein

Post Sat Sep 05, 2009 9:23 pm

Posts: 197
Location: Bucktown, PA
I have some standard bore NOS ULH Pistons if that would help.


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