78.4 Crank?, drop in? |
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78.4 Crank?, drop in? |
thomasotten |
Aug 8 2004, 09:23 AM
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#1
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Senior Member Group: Members Posts: 1,552 Joined: 16-November 03 From: San Antonio, Texas Member No.: 1,349 |
I have been reading about the 78.4 crank. But I can't figure out from what vehicle they came out of. The 914 2.0 had the 71, right? Is this a "drop in"?
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NoName |
Aug 8 2004, 11:51 AM
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#2
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Unregistered |
DPR makes good 78mm cranks and you can buy them (and con rods) here. If you can get the "All About Performance VW Engines, Part II" book from Hot VWs, they have a FAT Performance article on building a large displacement Type IV motor and they give some clearance numbers e.g., connecting rod to case clearance should be at least 0.040-inch and a minimum clearance of 0.060-inch between lobes and connecting rod caps. Use a reduced base circle cam. You also want a (Connecting Rod Length) / ( Crankshaft Stroke) ratio of around 1.75 or 1.8.
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