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Jacks
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Joined: July 15, 2006
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Location: San Clemente, Ca.
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PostPosted: Sat Dec 06, 2014 9:41 pm    Post subject: Reply with quote
GTV wrote:
Jacks wrote:
GTV wrote:
6mm seems a bit too much for me, unless you are also going for a longer rod?
I like this idea. If a Okrasa/WW stroker crank of 69.5 is used in place of the stock crank, the throw will be in increased by 5.5mm, (I dont have my #s at hand) a close match for compression ratio. A little trimming of the barrels maybe... Good for 356 crank ( 74mm) too.


Not exactly. Think about how the crankshaft is designed. When the stroke is increased by 5.5mm, it pushes the piston up an additional 2.75mm and pulls it down an additional 2.75mm. A 6mm shorter crown will need a 12mm longer crank. Or a longer rod.
And that's where a little trimming of the barrels come in. Idea
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GTV
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PostPosted: Sat Dec 06, 2014 10:30 pm    Post subject: Reply with quote
3.25mm is more than a little Wink
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Jacks
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PostPosted: Sat Dec 06, 2014 10:52 pm    Post subject: Reply with quote
Well, I've trimmed cylinders more than .250" for certain custom applications in the past. I won't bore you with the details Cool
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henry roberts
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Joined: February 24, 2003
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Location: australia
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PostPosted: Sat Dec 06, 2014 11:22 pm    Post subject: Reply with quote
oldturtle22 wrote:
I own a dyno shop


hi chris, my name's henry, I'm your new best friend. Laughing
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