clutch 9 inch vs 11 inch

[rotorwrench]

Originally Posted by pooch

Does the throw out bearing sit in the same place out from end of crankshaft on both the 9 inch and 11 inch ?

Ie, are the flywheels the same thickness and when clamped down, are the fingers in identical positions ?

The flywheels are just drilled differently. There is no other difference unless you are dealing with earlier type flywheels. The T/O set up should also be the same.

[pooch]

Thanks so far for answering all my questions.

The last flathead I had was in 67 and I never had to go inside that one.

Flogged it around as a kid and nothing ever broke.

It has been said to remove the outer flywheel lip on the 9 inch flywheel.

I guess this is just for less weight and no other reason ?

How many pounds would it reduce it by ?

And once the flywheel was in the lathe, is it good to shave some more weight off and where from ?

Fenderless A roadster so not much weight to haul.

[JSeery]

It is not totality about the weight, it is about weight at a distance on a rotating mass. The inertia changes as the rotational weight changes. What is changing is the ability to accelerate, the less mass the less inertia and the faster the acceleration. Like wise the more mass on the outer edge of a rotation mass the greater the inertia and the slower the acceleration (or any change in the rotational speed).

If you are interested in a stump pulling truck or getting a heavy car started from a stop a lot of inertia in the flywheel is helpful. If you are interested in overall acceleration and the vehicle is fairly light, then a lot of flywheel inertia is not helpful. It is going to try and keep the driveline at its current speed and resist acceleration.

[robert dick]

i have found that taking a few lbs. off a 9" wheel and useing 10" springs in my 9" presure plate workd great

[nospartsman]

Does anyone know if Fort Wayne clutch has any use for flathead pressure plate cores? Or F W clutch phone #.

Got the phone from google.

[richard crow]

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call fort wayne clutch ask if they can make the 11 to be to feel ligher this way you wount need to drill fly wheel & buy a 9" clutch assembly it,s not ez to find a clutch thats not made in china

[flatheadmurre]

You can always change the springs to get less pressure.
Taking away some rotating mass needs machining and a smaller clutch.

[Walt Dupont--Me.]

Originally Posted by nospartsman

Does anyone know if Fort Wayne clutch has any use for flathead pressure plate cores? Or F W clutch phone #.

Got the phone from google.

Call F W Clutch, talk to Kerry, he will tell you if they need Pressure plate cores. He has built a lot for me. 1-800-258-8243 Walt

[Walt Dupont--Me.]

Originally Posted by richard crow

call fort wayne clutch ask if they can make the 11 to be to feel ligher this way you wount need to drill fly wheel & buy a 9" clutch assembly it,s not ez to find a clutch thats not made in china

I never use China clutch and PP, that why I get all mine from F-W-Clutch. Walt

[CSArno]

Originally Posted by Walt Dupont--Me.

The aluminum wheel with the steel insert is nice for real light car 12#, but expensive, It's a lot cheaper to turn down a stock wheel to about 20# and have it balanced. If you use a real light wheel in a heavy car it's hard to take off up hill, you have to rev the engine. Remember a Model A engine has a 65# flywheel and 40HP, if the engine dies you can ride home on the flywheel. Walt

Walt,
How much did you tell me you turned down a model A flywheel once? You said you weighed the shavings..

[Walt Dupont--Me.]

Originally Posted by CSArno

Walt,
How much did you tell me you turned down a model A flywheel once? You said you weighed the shavings..

I had my Model A wheel copped down to 35# and redrilled for 9in. pressure plate, The clutch pushed so smooth compared to the stock Model A, of course my 31 rumble seat coupe, I built a B engine, hi compression head, bored .060, B trans with 41-48 gears, 3:54 rear gears, cruises 60-65 mph, I cruise 55-60 usually, at 55 mph turns 2300 rpm, listening to my country CD,s up in the ceiling. Walt OH, F-1 steering box, 48 brakes, 16in. Michelan tube type tires tires.