[DeTomaso] clutch?

Larry - Ohio Time Corp larry at ohiotimecorp.com
Mon Dec 1 09:24:29 EST 2008


John,

So simple, yet I have never read it or came up with it on my own!
Excellent advice.

Larry - Cleveland

-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of John Taphorn
Sent: Thursday, November 27, 2008 8:10 AM
To: detomaso at realbig.com
Subject: Re: [DeTomaso] clutch?

A strongly sprung pressure plate will also increase the load on the crank's 
thrust surface and bearing.  When the clutch is depressed at idle (e.g. at a

traffic light) the engines oil pressure is relatively lower and the crank's 
thrust surface riding on the center main bearing is susceptible to wear.

Due to another issue, a previous engine build of mine had only about 15lbs 
at idle and I was running a heavily sprung pressure plate from McLeod.  In 
this environment, the crank's thrust surface suffered wear.  The crank was 
replaced anyway because it was cracked which in turn damaged the main 
bearings causing the low oil pressure in the first place.  However, it did 
enlighten me as to the correlation between low oil pressure, strongly sprung

pressure plates and crank thrust surfaces.

I now better appreciate higher oil pressures at idle and never start the car

with the clutch engaged.  I wait for oil pressure to build before depressing

the clutch to spare the cranks thrust surface.

Happy Thanksgiving !

JT


----- Original Message ----- 
From: "Göran Malmberg" <hemipanter at hemipanter.se>
To: <Dickruzzindesign at aol.com>; <JDeRyke at aol.com>; <detomaso at realbig.com>
Sent: Thursday, November 27, 2008 1:35 AM
Subject: Re: [DeTomaso] clutch?


> All of these thing is of influence for selecting a proper clutch. Of 
> course, the "more is better"
> routine is not very good. A heavy pressure plate will load the leg, 
> release bearing and the
> hydraulic cylinders. Remember that the clutch cylinders has a loooong 
> throw compared to
> that of the braking system, which makes for an big difference in wear from

> heavy use.
> So no more pressure plate than needed should ever be used.
> The difference of tire grip, final drive and the like is the duration of 
> Tq in time. We could call it
> "chock loads". Hp number is not really important but Tq is. ( The Hp 
> number is Tq at a specific rpm).
>
> Goran
>  ----- Original Message ----- 
>  From: Dickruzzindesign at aol.com
>  To: JDeRyke at aol.com ; hemipanter at hemipanter.se ; detomaso at realbig.com
>  Sent: Thursday, November 27, 2008 5:23 AM
>  Subject: Re: [DeTomaso] clutch?
>
>
>  I thought that the force of a pressure plate had to be designed to 
> accomodate the horsepower and torque of the engine with the weight of the 
> car, final drive and stickiness of the tires as added influences.
>
>  I do not think that the more the better applies.
>
>  Maybe that is why there is so much discussion over clutch effort.
>
>  All the best,
>  Dick Ruzzin
>  ____________________________________________________
>  dickruzzinDESIGN at aol.com
>  920 Whittier Rd. Grosse Pointe Park, MI 48230
>  Phone: +313-824-0539 / Cell: +313-300-9558
>
>
>
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