Clutch Help

John Lang · 07-18-2009, 03:12 PM

A friend that I help has a 63 Corvette Gran Sport clone , one of those Road Racer things! He is haveing clutch trouble as in it is starting to slip. He doesn't have any oil leakage problems, it's adjusted right,and only about 400 mi of pretty hard driveing ! It's got a 572 Chevy Crate motor, the720hp version, with a 5 spd, and a 4.10 rear gear! The tires are some road race stickys, about12" wide, the car weighs approx ,2400 # w/driver, and it now has a Centerforce clutch thats starting to go away ! I suggested a dual disc, I just didn't know about brands ,or who to see ! Anybody got any Ideas ? The car is mint and it's been to Bloomington several times , just to screw with some of the judges ! Thanks in advance , John

Bill Belden · 07-18-2009, 04:54 PM

Advanced Clutches
Call Rob Youngblood: 208-880-6214
Advancedclutches.com

Alan Roehrich · 07-19-2009, 09:12 AM

That car shouldn't need a trick clutch. But I don't think anything Centerforce has is up to the task. I'd be looking at a Borg & Beck / Long style pressure plate with some centrifugal assist, and a sprung hub paddle clutch, probably 6 pucks, with a moderately aggressive friction material.

John Lang · 07-19-2009, 02:16 PM

Thanks for your help ! I will tell him as he is also an old fart, and loves his toys ! He does get kind of nuts at times ! We have Road America, at Elkhart Lake, just 24 miles away, but most times he plays on the side cty rds, Thanks........... John I,m more of a Mopar person but jeez does that thing fly ! He is also got a 65 Corvette coupe, with i think they call it an LS7 ? Its a 427 sb with a dry sump etc. Some other time !

Jeff Lee · 07-20-2009, 01:11 AM

There are several dual disk units from just about any seller that would probably be appropriate for this application. Any would depend on the level of work the guy wants to put into it (is this track only?). A dual disk diaghram unit would be the easiest to set up (just bolt it in) and if he's not into setting records for lap times and just wants to go have fun, it should be fine IMO. But if he has sticky track tires and is putting a big load on everything, it could break parts and or loose traction (could cause a wreck) just like a drag car. You can adjust the slippage on a diaghram clutch by increasing the installed height. I would suggest a data logger is a necessity if he's looking for that level of tuning.

Troy Henderson · 07-20-2009, 08:29 AM

If your serious about finding what the clutch capacity of his application would need to be Patrick Hale makes some nice software..

http://quarterjr.com/clutch_pro.htm

07-18-2009, 03:12 PM	#1
John Lang Member Join Date: Oct 2003 Location: Sheboygan Wi Posts: 391 Likes: 0 Liked 6 Times in 2 Posts	Clutch Help A friend that I help has a 63 Corvette Gran Sport clone , one of those Road Racer things! He is haveing clutch trouble as in it is starting to slip. He doesn't have any oil leakage problems, it's adjusted right,and only about 400 mi of pretty hard driveing ! It's got a 572 Chevy Crate motor, the720hp version, with a 5 spd, and a 4.10 rear gear! The tires are some road race stickys, about12" wide, the car weighs approx ,2400 # w/driver, and it now has a Centerforce clutch thats starting to go away ! I suggested a dual disc, I just didn't know about brands ,or who to see ! Anybody got any Ideas ? The car is mint and it's been to Bloomington several times , just to screw with some of the judges ! Thanks in advance , John __________________ John Lang 365 STK, SS

07-18-2009, 04:54 PM	#2
Bill Belden Member Join Date: Jun 2002 Location: York, PA Posts: 241 Likes: 0 Liked 1 Time in 1 Post	Re: Clutch Help Advanced Clutches Call Rob Youngblood: 208-880-6214 Advancedclutches.com __________________ Bill Belden Retired Stock Eliminator [emailSTK1100@comcast.net[/email]

07-19-2009, 09:12 AM	#3
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,090 Likes: 1,534 Liked 1,758 Times in 398 Posts	Re: Clutch Help That car shouldn't need a trick clutch. But I don't think anything Centerforce has is up to the task. I'd be looking at a Borg & Beck / Long style pressure plate with some centrifugal assist, and a sprung hub paddle clutch, probably 6 pucks, with a moderately aggressive friction material. __________________ Alan Roehrich 212A G/S

07-19-2009, 02:16 PM	#4
John Lang Member Join Date: Oct 2003 Location: Sheboygan Wi Posts: 391 Likes: 0 Liked 6 Times in 2 Posts	Re: Clutch Help Thanks for your help ! I will tell him as he is also an old fart, and loves his toys ! He does get kind of nuts at times ! We have Road America, at Elkhart Lake, just 24 miles away, but most times he plays on the side cty rds, Thanks........... John I,m more of a Mopar person but jeez does that thing fly ! He is also got a 65 Corvette coupe, with i think they call it an LS7 ? Its a 427 sb with a dry sump etc. Some other time ! __________________ John Lang 365 STK, SS

07-20-2009, 01:11 AM	#5
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 3 Times in 3 Posts	Re: Clutch Help There are several dual disk units from just about any seller that would probably be appropriate for this application. Any would depend on the level of work the guy wants to put into it (is this track only?). A dual disk diaghram unit would be the easiest to set up (just bolt it in) and if he's not into setting records for lap times and just wants to go have fun, it should be fine IMO. But if he has sticky track tires and is putting a big load on everything, it could break parts and or loose traction (could cause a wreck) just like a drag car. You can adjust the slippage on a diaghram clutch by increasing the installed height. I would suggest a data logger is a necessity if he's looking for that level of tuning. __________________ Jeff Lee 7494 D/S '70 AMX

07-20-2009, 08:29 AM	#6
Troy Henderson Member Join Date: Jul 2006 Location: Kansas City Posts: 404 Likes: 126 Liked 120 Times in 37 Posts	Re: Clutch Help If your serious about finding what the clutch capacity of his application would need to be Patrick Hale makes some nice software.. http://quarterjr.com/clutch_pro.htm __________________ Troy Henderson Henderson Race Shop LLC 816-520-5389 www.hendersonraceshop.com

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode