John Hamilton John Hamilton Navarre, FL (23 posts) Registered: 10/28/2009 11:18PM Main British Car: 1965 MGB 1840 cc MGB |
4.0 crank grinding
Just wondering if I can turn down a 4.0 crank from 2.185" down to 2.1" so I can use Chevy rods? Will this compromise strength in a 7000 RPM race motor?
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6500 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: 4.0 crank grinding
Shouldn't
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minorv8 Jukka Harkola (271 posts) Registered: 04/08/2009 06:50AM Main British Car: Morris Minor Rover V8 |
Re: 4.0 crank grinding
My stroker crank has TVR sized rod journals (narrow) and the rod big end width is 19,4 mm ( just over 3/4"). They needed a bit more machining. Also the bearings had to be machined narrower.
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: 4.0 crank grinding
Hi John, First off, you have verified all manner of components to get you max power at 7k rpm. ? If so, by all means, 2.100 journals. Don't assume taking .050" off each side of big end of rod will put end, in center of bore . Use bigger fillet on journals, if possible. If 3/8" bolts, use AP 2000.
What is your hp. level ? Don't expect your cast iron crank to live many happy racing miles, at hi hp. and rpm. Good luck, Art. |