Chris White

Very uncommon....and I have soem bellhousings here if you need one!

ajrlredondo

I have seen here in Spain two bell housing failures on 968 cup cars. The references of the 951 and the 968 bells are differents. I use a 951 cup car and no problems until now. But is not a rare failure!!

elargentino

This thread is of interest to me.
We have some saying rare and some saying not rare.
I have not seen it, and I have worked on 1 or 2 951's in my life.

Mr. Redondo - what are the circumstances please, surrounding these clutch housing failures?

ajrlredondo

I have seen these failures on 50 minutes races cars, but always on 968 cup cars, not in 951´s. The reference number for these parts are different, so I think it must be stronger the 951 clutch housing.

Chris White

The 944 and 968 bellhousings are very different –the 968 is a two piece bellhousing designed for quick clutch changes. I would not be surprised if the 968s that are having failures have swapped out the dual mass flywheel for a ‘regular’ flywheel.

Voith

Later bellhousings are made with thinner walls wich does contribute to weight saving, but are desintegrating because of it. Use 944 na bellhousing from arround 1986 and it will be a little heavyer but it wont fell apart like later ones do.

flipo

i was told that the NA bell housing is different from the 951 one ,the location of the starter is said to be different because of the larger starter gear.

Can anybody confirm this???

elargentino

Yes, I can.
There is a 4R and a 2R - just going from memory.
But you want to make sure you don't use the wrong one - it will happy as hell to bolt on there perfectly, you only find out when its too late. And you will want to light yourself on fire and jump off a skyscraper.

Voith

I have both and they seem 100% same only na is visually part that is higher quality.

I'll check the starter hole tomorrow.

elargentino

I am NOT guessing, my friend.

Voith

I belive you. I'll still check however since I was shure they are the same till now.


If I understand this, the starter gear is bigger and flywheel is smaller on na?

elargentino

It places the starter VERY slighlty off-kilter, and makes a horrifying noise that you will never forget - because it comes at the same time as your realization that your are doing essentially the entire clutch job over again.

Voith

Ouch.

Voith

I dont see any difference. 951 part is visually lesser quality casting, half of kilogram lighter and has thinner walls. But thats it.

Can you tell me exactly what else is different?










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elargentino

I already told you.
Its very slight.
It comes from the different ring gears from NA to turbo.

The fact that you went through this trouble to question me makes me HOPE you don't believe me.