v8ian ian stewart just north of London, United Kingdom, Planet Earth (54 posts) Registered: 12/24/2009 04:06PM Main British Car: 67 Ford Cortina 3.9ltr Rover |
Re: Stroker cranks
I would think the bigger problem with the engine would be the dreaded cap walk on any pre X bolted block, my JE 3.9 has been run to silly revs, 8,2k on a missed shift, has ARP rod bolts and stock Injection rods, when I pulled the engine apart, there was clear signs the caps were moving, but the caps were still tight, I assume the problem gets worse the longer the stroke gets??
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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: Stroker cranks
Personally, Unless rules would prohibit ther use, I see no good reason not to use a x-bolted block unless you must have the increased deck height of a 300/340 or 350 block.I think the "small journal" cranks will wiggle more than later ones to accellerate the problem. Wer'e all waiting to see how "Mike's 4.02" bore holds-up. I believe 2010 is going to be "interesting", roverman.
Edited 1 time(s). Last edit at 12/25/2009 04:16PM by roverman. |
Re: Stroker cranks
On a slightly related subject, I laid the 4.2 crank in the Olds block. The only possible issue is the lack of an oil slinger. I haven't opened the gasket set yet to find out if there's a neoprene seal in there. If it's neoprene, I might be ok.
Other than that, the hole where the input shaft pilot bearing lives, that hole is flanged out a bit more than the stock 215 crank. |
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: Stroker cranks
Paul, If your using a 215 Olds full set it should have "rope" for both ends of the crank. I suggest up-grading to TR8/lateRover seals.This will require machining a suitable "counterbore" in the 215,rear main cap/block. An older style, auto cylinder "boring bar"(machine), works well for this purpose.I used to charge $50 for the mod,(old school). Good Luck,roverman.
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