Mon Jul 08, 2013 3:56 pm by Admin

For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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Throw out bearing travel (how much is enough)

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Throw out bearing travel (how much is enough)

Post  speedsterman on Wed Nov 28, 2012 7:56 am

Hey Folks
I have measured my throw out bearing travel at about 1/2 ". The clutch disc does disengage from the pressure plate. Not by much, but it is loose. I am running stock pressure plate and throw out from '99 camero, stock 944 rebuilt clutch master.
Should I put in a larger master to get more travel or wait and see how it works with engine running (about 2 months off) ?
I don't want to increase my pedal force with a larger diameter master if I don't have too. I know most of you guys are running bigger clutches but I am just building a driver (for now).
Thanks for any help,insight.


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Re: Throw out bearing travel (how much is enough)

Post  xschop on Wed Nov 28, 2012 9:12 am

13/16" Wilwood. From experience the Factory PP fingers are taller than the Centerforce PP finger and require more throw/MC volume.

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Re: Throw out bearing travel (how much is enough)

Post  spence on Wed Nov 28, 2012 10:14 am

With the clutch pushed in, reach up inside the torque tube bellhousing and try to spin the shaft. If it spins freely you're good.

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Re: Throw out bearing travel (how much is enough)

Post  Porch on Wed Nov 28, 2012 10:19 pm

I would say to go ahead and do the clutch master now, while you have the slave out of the car (which makes bleeding a lot easier). Even for a daily driver with a stock clutch the Porsche 3/4" master just isn't enough.

I have a 7/8 and it's a bit much, i think you could get away with a 13/16 as xschop said. I have a CNC brand and it's very nice--i wore out two of the "compact" Wilwood/Tilton ones in the 30k miles or so that i have on the car.

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Re: Throw out bearing travel (how much is enough)

Post  speedsterman on Thu Nov 29, 2012 1:35 am

Thanks for the help. I will go ahead with the 13/16 wilwood master. Does anyone recall the part number for the master that ya'll are using with your cars?


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Re: Throw out bearing travel (how much is enough)

Post  Rich L. on Thu Nov 29, 2012 1:35 pm

1/2" should be enough travel. But something I notice is that while I get that much with a fresh bleed of the clutch hydraulics, after a session or two of hard running on the track I'm down to more like 1/3" and that's not enough to get good release of the clutch disc. I end up getting a lot of gear clash on up shifts. So I've been having to bleed my clutch in the paddock a couple times during a track day.

I'm running a 1" compact Wilwood master in a Tilton pedal box. The slave has the proper casting number and I've got a remote bleeder on there. It's a complete SPEC clutch package with the shim installed after getting all of the correct measurements. When the gear clash develops, I notice that my clutch pedal is not fully returning. I can lift it up but then the first bit of it's travel is very easy and clearly does nothing underneath. It's like the slave cylinder is hanging up and not fully returning into it's seat. Giving it a quick pressure bleed fixes it.

Also of note is that I get brackish fluid out even after just 1 hour of use. This seems to be common or even normal for the LS1 slave cylinder.

Any ideas how to clear this up?

Rich L.

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