Easier and more economical to sleeve and pin all eight or even just a
couple of cylinders. As far as the crank is concerned, you might
offset grind it and chrome it back to -.20.
Skip
At 10:34 AM 2/20/2011, Larry Mayfield wrote:
>I have been toying around with an idea for a new motor for my Sunbeam.
>But it would require a destroked crank to meet the displacement
>goals. I have been searching around for such cranks and they are
>pretty rare. Some are apparently used in a Nascar class somewhere
>which has a displacement limit. I know about off set grinding to
>either stroke or destroke abit. But, even with a brand new crank, I
>would not be able to get there. So, my question... I know cranks
>can be welded up and reground. But how much can that be used? If I
>wanted to take a crank down with a stroke difference of say 1/2
>inch? That seems like a LOT, lol, as it would require a 1/4 inch or
>more of buildup on the inside of the rod throw. Even if I started
>with a 289 ford crank it would still be a lot. And is that even
>doable with a cast crank? I would expect it to be ok on a forged
>steel or billet crank, though.
>
>I'd like some responses from folk who have actually had something
>like this done. Suggestions of changing motor blocks etc are not
>what I am looking for.
>
>And I am just fiddling around now. The Sunbeam may never run again
>as a race car..and that would no doubt please a LOT of people, lol...
>
>mayf
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