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There are 356 Speedsters with 911 six cylinder engines in them. They are very powerful but have a lot of weight in the back and it seems that some of the handling is lost.

For a Mazda rotary in a similar installation, check in the Bradleygt web site. Click on owners page. Look at ron gt2.from Hillsboro Oregon. Nice conversion.
I can see two problems with the use of a motorcycle engine in a Speedster replica:

1) A motorcycle engine does not have the kind of torque curve necessary to start an 1800 lb load from a standing start in any kind of realistic fashion.

2) The source for an adaptor plate for a VW tranny would seem to be a problem. I checked Kennedy Engineering and they do not list anything involving a motorcycle engine.
Dan, go with a 4 cyl. engine. Type I or IV. I've been trying for the last few months to make a 911 fit into a tube frame. It'll work, but the time, money & frustration of making it fit will drive you crazy - not to mention the weight distribution problems. With a type I or IV you can build up the HP to match the 911 engine & still keep you sanity.
"big time piston slap" . . . ?

How cool ! ! The last time I even HEARD that mentioned was with my old 409 Chevy. Looks like GM is still having it's problems.

Piston slap . . . Man, does THAT ever bring back memories.

"Sounds like a piston slap." I think that I may start using that saying again.
The engine is done, sitting up on the stand, all dressed up to look like a VW/Porsche product. I'll have to get some shots of it and post them soon. It's really lookin' sweet.

The shell is still a mess, but I figured out how to swap a VW IRS suspension and trans into the swing axle 356 tub, so things should be moving as soon as the weather warms up.

I do have some nice pics of the detailed and refurbished trim, dash, interior and such, along with the two doors all nicely done up . . . but that's the boring crap.
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