333pg333

Lol, by the time I get to use a dry sumped motor I will need 5 plate custom clutch and flywheel anyway. Any and all of those options might be some time away....

ehall

You're getting to be like Rolex. All you REALLY want is to gain sympathy from building the damned car. you don't actually ever want to drive it!

333pg333

Oh but you're wrong Elliot. I want to drive the ****** so very much!! Re-crossing fingers to be out there in a week.

Duke

For my dry sumped engine I'm hoping to get a custom flywheel with 60-2 teeth. It's really the best place to have the trigger wheel and sensor there.

Sorry for your delay, you're so close now!!

Chris White

A couple of thoughts –
I am sure you know I am not a fan of the stock starter ring gear trigger system, so keep in mind that I am biased!
The Clewitt system uses a ½” mag sensor that is very forgiving when it comes to the gap, I have seen it run fine with gaps as large as .100” – on an Electromotive system. Each system has a bias towards a certain type of sensor, Haltech works much better with a hall effect sensor, Electromotive works better with a magnetic sensor – I don’t know which type works better on a Motec unit.
The stock location is more susceptible to RFI noise from the starter. It may be possible that the Motec is picking up enough noise during cranking to flag an error.
What is the position of the cam trigger home relative to TDC? The optimal position for most systems is 60-80 degrees before TDC.

333pg333

I was wondering about that type of setup Duke. What would be entailed? When one sees advertisements for multi disc clutches does this mean that there has to be a custom flywheel built each time too? Never seem to see an accompanying advertisement for those?

Duke

Yes a custom fly wheel would have to be built. But you have more headaches than that to fit a multi disc clutch. First of all it might be too tall to fit within the bell housing, second of all you need a custom release setup (so you can de-engage!)

fast951

Patrick, I sent you a detailed email. Using the 132 teeth + Cam signal, will generate speed/ref sync errors.
I had this back in the 90s on my 3L with Motec. Ignition timing did not deviate, but I did not test every possible condition.
The issue is related that you cannot divide 360 by 132. (360/6 = 60 for 60-2 trigger wheel.. or 360/10=36 for 36-1...). Unless the Motec firmware changed (possible) this is the main reason 360/132= 2.727 and Motec does not like it... My information comes from the Motec field engineers I worked with back then.

A simple solution would be to add a 60-2 or 36-1 wheels at the front of the engine. Or use 12 teeth (set screws) on the flywheel. + CAM sensor.

Paulyy

On the topic of multi plate clutches, Exedy have a twin and a tripple plate clutch listed for the 944 turbo series cars. which is quite interesting. only problem is they don't show torque ratings.

95ONE

I'm using a Tilton quad disc. 5.5" It's rated around 1000ft lbs of torque. (only because of the great deal I got on it) The Triple is rated at 750ft lbs. (What I would have used.) The twin disc is rated at 500ft lbs. (What I would suggest for anyone else) It's an on / off sort of clutch. No in between. If you try to feather it, it just burns up. There are other discs that are a little more forgiving, but they can't hold as much.

Tilton also offers a 7.5" that holds as much with only one or 2 discs. But the inertia is greater. Then there's the carbon set up, but you could buy 2 or 3 used 951s for that price.

Not that this information is much help though. All my stuff is one-off custom this and that to make it work using custom stuff. - I'm beginning to think I must actually hate myself and this is my own form of self torture.

333pg333

The Clewett has been fitted so all should work fine now. I've heard that the sensor they use is not so great. I considered if we could use the stock sensor if it could be made to reach and fit their bracket? I don't know the cam trigger position off the top of my head Chris.

Pretty sure a couple of people have investigated getting one made up. Not sure how far they got?

Thanks John. Email replied.

I didn't know that Paulyy. Be interesting to find out a little more on these?

How do you get these multi disk setups to fit Bruce?

Paulyy

on the site, (i can't copy and paste the link because it's flash not html, it'll just take you to the main page) when you search porsche / 944 / turbo in the drop down menu, it shows a lot of different options like single, twin and tripple. then the disc compounds and stuff. but no prices and torque ratings nothing.

I've spoken to a few people that sell them but they couldn't tell me any specs about them

333pg333

Thanks for the tip. Be interesting to find out about their setups including custom flywheels.

95ONE

Patrick,its a combination of research, custom chevy parts, drilling, machining, a lot of measuring, and a custom spec'd out hydraulic release bearing. Then theres the custom torque tube that will have a flange welded on to bolt to the tilton magnesium bell housing made for a chevy.

333pg333

Ahh, so it's bolt on Bruce.