flex plate weight

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flex plate weight - 12/17/2007 3:40:56 PM    my77project   Posts: 40 Joined: 11/3/2007 Status: offline this goes out to my77stang in particular, but anyone else as well who knows the answer.  I know that around 80 they switched from a 28 oz flex plate to a 50 oz one.  my question is, can I take a late 80's motor w/ 50 oz flex plate and mate it to my 77 c4 transmission?  I know the flex plate effects the ballance of the engine, but I don't know what else it effects as far as the interface with the tranny etc.  help would be much appreciated here as I'm trying to figure out what option I should take w/ my engine.  Post #: 1

RE: flex plate weight - 12/17/2007 3:48:48 PM    my77stang Posts: 6878 Joined: 12/19/2006 From: Citrus County, FL Status: offline you need the harmonic balance and the flexplate to both be 50 oz. the problem is a regular 302 flexplate will not fit in the Mustang II bellhousing. So, the answer is to take your 28 oz Mustang II flywheel and have it rebalanced for a 50 oz application. I used to have one, but it got sold on ebay a few years ago. btw, you can't just use the old 28oz harmonic balance and 28 oz flexplate on the later motor. that = essploded motor (can you tell i've done this before?) (in reply to my77project) Post #: 2

RE: flex plate weight - 12/17/2007 3:56:36 PM    my77project   Posts: 40 Joined: 11/3/2007 Status: offline just curious, but why does that make an exploded motor?  (in reply to my77stang) Post #: 3

RE: flex plate weight - 12/17/2007 5:04:08 PM    my77stang Posts: 6878 Joined: 12/19/2006 From: Citrus County, FL Status: offline because it does but seriously, the rotating assembly needs a 28 or 50 oz balancer/flexplate to offset the imblance of the crank/pistons/rods so you cant just mix and match (in reply to my77project) Post #: 4

RE: flex plate weight - 12/17/2007 7:57:24 PM    mjr46 Posts: 8568 Joined: 6/13/2007 Status: offline the imbalance if not correct will make cottage cheese out of the mains..it'll cause way to much harmonics...you can buy a 50 oz flexplate for a c-4 they are cheap!!!   cost under 150.00 or even less I believe _____________________________ quote: ORIGINAL: AdderMk2 im an asshole.... deal with it (in reply to my77stang) Post #: 5

RE: flex plate weight - 12/17/2007 8:08:02 PM    my77stang Posts: 6878 Joined: 12/19/2006 From: Citrus County, FL Status: offline the problem is the II's have a smaller flexplate than used on any other 302. its Mustang II 302 specific for 1975-1978.  (in reply to mjr46) Post #: 6

RE: flex plate weight - 12/18/2007 5:13:31 PM    my77project   Posts: 40 Joined: 11/3/2007 Status: offline so can most machine shops do the reballance? (in reply to my77stang) Post #: 7

RE: flex plate weight - 12/18/2007 6:41:13 PM    my77stang Posts: 6878 Joined: 12/19/2006 From: Citrus County, FL Status: offline any machine shop that has a balancer.  (in reply to my77project) Post #: 8

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