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Author
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Topic: Whats the deal on this 28 and 50oz stuff ??
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bud4660
Gearhead Posts: 513
From: Mesquite, Tx. M&M #2925
Registered: Apr 2003
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posted 09-20-2004 08:38 AM
   
A friend of mine is building a 302 and was asking me why there is a 28 and a 50 oz balance and why there is a 157 and a 164 tooth flywheel. He is building from scratch and is thinking about using an AOD tranny.
So is there a good and bad with any of the choices? Dont you have to use a 164 with the AOD?
Thanks Guys
Bud------------------
1967 GT Fastback S code, C6, 4:56, tubbed, 10 point cage.
http://www.allfordmustangs.com/forums/photopost/showgallery.php/cat/500/ppuser/12578 1998 GT Convert.(sold 11/29/03)
Mesh Grille, Air Silencer Trimmed
Automatic, 3:73 FRPP Gears, Mac Girdle, Moser Axles
Griggs Sub's, Welded/Plated Torque Boxes, Strut Tower Brace, Strange 10way Struts, MM HD lower control arms, Rear air bags
ProStars 15x10 w/295/50/15, 15x4 w/P195/75/15 and ARP Studs, 9/16" spacers
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capri man
Gearhead Posts: 6417
From: doerun, ga.
Registered: Nov 2000
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posted 09-20-2004 08:56 AM
bud you got mail!! if it is a pre 1981 engine it probably is a 28oz balance. if it is a post 1981 engine it probably is the 50oz balance. also the harmonic balancer and the flexplate have to match each other and the engine. if not, you will have a heck of a vibration that could damage bearings and even break a crankshaft. (dont ask me how i know this!!!) either one of the bellhousings will bolt right up to the 302, you just have to use the approiate flexplate and converter with each one. this is always true on ford smallblocks except sometimes. i sent you an article that might help confuse you some more. good luck------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.33 @92mph 1/8
1.54 60 ft. http://community.prestage.com/Member+Pages/789.aspx [This message has been edited by capri man (edited 09-20-2004).]
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bud4660
Gearhead Posts: 513
From: Mesquite, Tx. M&M #2925
Registered: Apr 2003
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posted 09-20-2004 09:10 AM
quote:
Originally posted by capri man:
bud you got mail!! if it is a pre 1981 engine it probably is a 28oz balance. if it is a post 1981 engine it probably is the 50oz balance. also the harmonic balancer and the flexplate have to match each other and the engine. if not, you will have a heck of a vibration that could damage bearings and even break a crankshaft. (dont ask me how i know this!!!) either one of the bellhousings will bolt right up to the 302, you just have to use the approiate flexplate and converter with each one. this is always true on ford smallblocks except sometimes. i sent you an article that might help confuse you some more. good luck
Thanks Mike!! He is building from scratch, so he can go either way. He was just wondering if one is better than the other. The engine will probably be balanced anyway. He's planning on using a big shot of NOS on it from what he's telling me.
Bud
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74merc
Gearhead Posts: 1006
From: Demopolis AL
Registered: Jun 99
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posted 09-20-2004 09:54 AM
quote:
Originally posted by capri man:
either one of the bellhousings will bolt right up to the 302, you just have to use the approiate flexplate and converter with each one. this is always true on ford smallblocks except sometimes. i sent you an article that might help confuse you some more.
lol
how true!
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bud4660
Gearhead Posts: 513
From: Mesquite, Tx. M&M #2925
Registered: Apr 2003
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posted 09-20-2004 05:40 PM
He still doesnt understand the difference. Which is better?
Thanks
Bud**Glad I have an FE**
lol
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indyphil
Gearhead Posts: 2398
From: Senoia, G.A. USA
Registered: Jul 2002
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posted 09-20-2004 06:01 PM
I was lead to believe that they went to the heavier 50oz because they used heavier components (stronger). With modern aftermarket alternatives its easily possible to have your rotating assembly balanced at 28oz, or even Zero balanced. The lower the balance weights the less stress is on the ends of the crank. So its generally thought to be better to go 28oz or zero if you can (zero balance dampers and flex plates can be harder to find are often race type and expensive so often 28oz seems to be cost effective)Im building a 331 from scratch and will aim for 28oz balance.
------------------
'68 coupe, '66 289 C code
engine, edel 600cfm carb, performer intake, dual exhaust http://www.geocities.com/ottouk_77/68mustang.htm
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bud4660
Gearhead Posts: 513
From: Mesquite, Tx. M&M #2925
Registered: Apr 2003
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posted 09-21-2004 08:33 AM
quote:
Originally posted by indyphil:
I was lead to believe that they went to the heavier 50oz because they used heavier components (stronger). With modern aftermarket alternatives its easily possible to have your rotating assembly balanced at 28oz, or even Zero balanced. The lower the balance weights the less stress is on the ends of the crank. So its generally thought to be better to go 28oz or zero if you can (zero balance dampers and flex plates can be harder to find are often race type and expensive so often 28oz seems to be cost effective)Im building a 331 from scratch and will aim for 28oz balance.
I passed that on.
Thanks
Bud
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