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Re: Largest bore on a stock 318.
[Re: Moparnut426]
#645017
03/19/10 01:37 PM
03/19/10 01:37 PM
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Joined: Jan 2003
Posts: 3,505 DFW
mr_340
master
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master
Joined: Jan 2003
Posts: 3,505
DFW
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Why not put a stroker crank in it instead of the big bores? I guess if you ruin a 318 block you haven't lost much except the machining costs.
Floyd Lippencott IV
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Re: Largest bore on a stock 318.
[Re: mr_340]
#645018
03/19/10 01:49 PM
03/19/10 01:49 PM
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Joined: Jan 2003
Posts: 543 Indiana, Just Off I-70
BradD
mopar
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mopar
Joined: Jan 2003
Posts: 543
Indiana, Just Off I-70
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I've been thinking about this lately too! What to do with original forged 340 cranks? I was thinking offset grind to 1.88 and use the plentyful 6.3 rods from the used NASCAR shops. The piston weight needs to be less than 440g from what I understand from the rod makers. I believe 3.79 stroke may be doable starting with a non ground journal. Possibly use a Ford Windsor shelf piston. I already have a 3.79 mopar crank that has to have the journals cut to 2". I have used Lentz 6.20 rods. I hope to use them sometime this year.
Brad
Check out the Dorn's 69 Barracuda "Switchblade" in the Nov.2010 MCG Check out the Dorn's refurbished 36 Ford in the Feb.2011 Street Rodder
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Re: Largest bore on a stock 318.
[Re: Moparnut426]
#645020
03/19/10 02:05 PM
03/19/10 02:05 PM
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Joined: Feb 2003
Posts: 12,675 Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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Sonic test it.. I think it's a "your results may vary" deal there... I've heard of them going to 4" bores. Never a 4.04 but if it's thick enough why not?
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: Largest bore on a stock 318.
[Re: BradD]
#645022
03/20/10 10:34 AM
03/20/10 10:34 AM
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Joined: Oct 2007
Posts: 4,209 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,209
New York
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3.79 stroke may be doable starting with a non ground journal
Math: 2.125 - 1.88 = .245". Assuming zero error/perfect alignment, the maximum stroke increase is .245", or 3.555".
Boffin Emeritus
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Re: Largest bore on a stock 318.
[Re: Moparnut426]
#645023
03/20/10 10:35 AM
03/20/10 10:35 AM
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Joined: Oct 2007
Posts: 4,209 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,209
New York
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.150" on the thrust axis makes me nervous.
Boffin Emeritus
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Re: Largest bore on a stock 318.
[Re: tjmarcus1]
#645024
03/20/10 10:37 AM
03/20/10 10:37 AM
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Joined: Oct 2007
Posts: 4,209 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,209
New York
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318 3.91" > 340 4.04" Result: 85% leakdown, poor oil control, high crankcase pressure. Don't.
Boffin Emeritus
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