10 inch vs 9 inch clutch

Unknown

the 3 37T clutches i have dismantled are all 9 inch,except for yesterdays find which is 10.When did they change over the sizes and are the flywheels,pressure plates,housings etc the same? If i put a 10 inch clutch into the 36T,am i creating problems?

Unknown

Well here goes, to the best of my knowledge the 9" clutches were used in the lighter cars with 6cyl. engines without overdrive. 10" clutches were used in 8cyl. cars,pickups, taxis, and cars with overdrives. I'm not sure if you can use the same flywheel or not, I know you cannot if your flywheel has the 3 driving lugs that fit into notches in the pressure plate. Probably the best thing is to get a 10" flywheel and as far as I know everything fits and works properly. If not , someone please jump in here and correct me. The 10 " clutch was a heavy duty option.

Geoff

You need to change the flywheel, drive plate and pressure plate. They just bolt right up. Theoretically there will be a bit more inertia with the 10" clutch, but in practice it doesn't seem to make much difference, just a slightly slower change into top gear. Steve is correct in outlining the usages of the bigger clutch. Your are not creating problems in any way by using the larger unit.

Unknown

thanks fellas,as always,your input is much appreciated

Huddy42

Skip,

Just make doubly sure the pressure plate matches the flywheel as there are several different types,been caught out with this before when guys send me pressure plates to rebuild and when returned it does not match the flywheel as they have come from different vehicles.

Unknown

This clutch came out of a 37 terra race special built by Graeme thwaites a few years ago.He raced it a couple of times at Winton and melted the rod babbit twice(methinks he didnt allow enough clearance on assembly)so he pulled the motor and clutch out and sold them to me.
He mentioned that hed bought the aluminium timing gear from sydney from Les Pendlebury,so maybe the 10 inch clutch came from there also,maybe Les remembers this car/owner.
I will use the clutch in the 36T ute as it is complete and operational,but i will need to recork it(can i persuade Les to come out of retirement? )

Huddy42

If you ask nicely kip, I'll think about it, just for you.LOL

It won't be the original cork though, as now we get a disc bonded on to the plate.

Unknown

Apparently one must only use Spanish cork,from trees grown on a south facing slope and harvested by spanish maidens in the month of Feb.Oh wait ,maybe thats Stradivaris violin varnish? i always get the two mixed up.
Much difference between the bonded sheet and the individual corks? do you cut spirals into em?

Huddy42

Yes skip they do cut spirals in them, have been doing this for 30 years, but recently changed the compound due to not being able to get the same material anymore.

SuperDave

Les,
That is something new to me..I sure would like to see a picture of the finished product.
Thanks, Dave W.

Huddy42

G'Day Dave,

I don't have any of the current ones we have done, but, these three shots are ones we did approx 25 years ago in the experimental stage, I have had many done over the years and never had a problem with any of them, I put one in the '42 just after I purchased the car from the USA in 1990 and still going strong, we used Dextron 2 in the clutch and works just fine.

Pictures 10 & 11 , I was not overly happy with the way they cut the spirals in these two early plates and the guy did get a lot better.

Picture 12 is a used one after many years service.

SuperDave

Les,
Amazing what can be done with a little thought.. A couple questions..How thick is the finished product? I had problems a long time back with discs that required two cover gaskets to be able to release the clutch. Not a lot of fun fixing that problem!!! Also, How do you deal with a disc that has loose springs? I agree Dexron works great for me. I have been using DexronIII for several years. If it works, don't fix it.
Thanks, Dave

Huddy42

Dave,
the overall finished thickness is 0.218-0.225, the thickness of the gasket is approx 30 Thou , when replacing springs I just heat the spring cover slightly just enough to remove the old spring, replace the spring with a new one, then reheat to close again, not too much heat when closing as this may soften the spring tension.