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Author
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Topic: Supercharger on a Stroker
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66project
Journeyman Posts: 25
From: Abilene TX USA
Registered: Jan 2003
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posted 04-14-2003 12:50 AM
   
As I build up my 347 stroker, I'm thinking of adding a Paxton Supercharger. Will a stroker engine take the extra stress caused by a supercharger without cutting it's life in half? I don't mind if it only cuts the life a little (I know it will!), but I've already spent enough on the engine that I don't want it to die at 40K miles! Any thoughts on this??
..and the only reason would be to show up those new Vettes at the light (ie not quite worth having to rebild the engine in a couple of years)!!------------------
'66 Coupe Frame Up In Early Stages
347 Stroker, Tremec 3550, 9 inch rear, 4X power disk brakes, coil over front suspension, rack and pinion steering, side exhaust, leather interior
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68 S-code GT
Gearhead Posts: 1175
From: Sayreville, NJ, US
Registered: Mar 2000
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posted 04-14-2003 07:36 AM
Another thing that might limit the use of the super charger is your compression ratio! You might run into problems if it is too high.
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V8 Thumper
Gearhead Posts: 3603
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 04-14-2003 08:43 AM
quote:
Originally posted by 66project:
Will a stroker engine take the extra stress caused by a supercharger without cutting it's life in half?
Sure it would. Provided of course that you choose only premium internals (forged/billet crank, rods, & pistons), spot-on machine work, an enormous cooling system, and keep the boost reasonable (>8 psi) there's no reason a wheezer can't live a long and happy life. As stated above, static c/r is key... 8.0-9.0:1 max. Piston/combustion chamber choice will be important; 3.400" stroke can make quite a bit of squeeze... you're likely looking at custom dished pistons. Really GOOD head gaskets are an absolute must. My guess for a blown 347... $10-12K if built properly 
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1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html
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blown 351
Journeyman Posts: 67
From: Seattle, Wa. 98258
Registered: Dec 2001
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posted 04-14-2003 09:36 AM
It all depends if you plan on punishing it or not.
V8 Thumper is right.
If you do plan on boosting it, i would suggest that you displace it to a 331, which gives the piston a little more ring land area and a slightly longer skirt for stability.
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bill haab
Gearhead Posts: 161
From: south bend in.
Registered: Oct 2002
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posted 04-14-2003 08:42 PM
From what my engine builder told me you have to build the engine for the paxton.
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n2oMike
Gearhead Posts: 1641
From: Spencer, WV
Registered: Jan 2001
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posted 04-14-2003 11:17 PM
Using power adders, it's easy enough to exceed the stock block's power capacity at the stock stroke. Stroking the assembly puts more stress on things and reduces the amount of power the block can safely deal with.I wouldn't recommend boosting a 347 very much if the stock block is going to be used. If so, I'd probably fill the block and use a good girdle... then hope for the best. I'd either use the stock stroke, or go with a 331. I've not really been all that impressed with most 347's. Of course you could just build a 408, (the 351W block is MUCH stronger, and has beefier 1/2" head bolts to keep the gaskets in place) and have just as much or MORE power than a blown 302 based engine. It would also cost significantly less since you woulndn't need to buy a supercharger... Then if you still weren't satisfied, nitrous would definitely push the engine into the 'scary' category.  At least, that's what I would do. Good Luck! ------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220
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steve'66
Gearhead Posts: 6768
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 04-14-2003 11:49 PM
quote:
Originally posted by n2oMike:
Of course you could just build a 408, (the 351W block is MUCH stronger, and has beefier 1/2" head bolts to keep the gaskets in place) and have just as much or MORE power than a blown 302 based engine. It would also cost significantly less since you woulndn't need to buy a supercharger... Then if you still weren't satisfied, nitrous would definitely push the engine into the 'scary' category. At least, that's what I would do. Good Luck!
Mike, I agree, most of the little motors that we race with are 331/347s and run like our old 351w did. (low 12s) One of our buddies has a paxton on his and runs low 11s. Our 408w runs mid 10's with no power adders and a fairly mild roller cam. With a shot of juice we're talking low 10/high 9's with about the same investment as a stroked "little" motor on juice. Ford got it right when they stroked the 302 to 351 with the 351W block. No offense to the 289/302 engines, it's just that the 351W's block is awesome and much better than a 350 ci sbc.  SteveW
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66project
Journeyman Posts: 25
From: Abilene TX USA
Registered: Jan 2003
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posted 04-15-2003 12:01 AM
Yeah, my next engine will be a 351 for sure...but I have the 347 stroker mostly assembled, with the 302 bell housing/flywheel/clutch, heads, manifolds, etc etc...in other words, I'm too far along to make such a costly change of mind!
From what's been said, I think I'll forgo the extra boost for now. That'll give me something to do in 10 years!
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