I have had decent success with OEM stuff up to 6500 rpm with the occasional 7
grand. I wouldn?t risk above that without going to better stuff. I do believe
that the cost accountants have done more to damage the reliability of the parts
in everything we use than can be assessed. When they get it right great, but
off by a little bit and reliability goes out the window.
I?m in the construction equipment dealership world. We see this constantly in
new models of tractors. The cost rationalize the ne w designs and miss. All
sorts of failures of the new designs then get fixed with product improvement
programs until the design will hold up.
Bob
From: Fot [mailto:fot-bounces at autox.team.net] On Behalf Of Brad Eells via Fot
Sent: Friday, December 22, 2017 1:34 AM
To: Rich Hahn
Cc: fot
Subject: Re: [Fot] clutch disc blow-up picture
Interesting...the Spitfire I have acquired was running the stock clutches
available in the 1970's, ran hard (above 8000 rpm with a 1300), won lots of
races but did not report any clutch failures in the copious notes I have.
Of course, I don't know how often the clutch disc was being replaced. He had
three gearboxes, all with different ratio or overdrive set ups and had them in
and out depending on the track he was racing.
Wonder if the disc manufacturing is not of the same quality it was 40 years
ago??
Brad Eells
Chino CA
#35 DP 1962 Triumph TR4
#76 FP 1969 Triumph Spitfire Mk3
1965 Triumph TR4A IRS...for the road!
On Thu, Dec 21, 2017 at 6:27 PM, Rich Hahn <putinbaytr3 at yahoo.com> wrote:
Stock Spit clutches even current heavy duty ones won't stand up to 7000 RPM. I
don't know if its the state of materials used today due to EPA regs but I
ripped to pressure plate side friction material off a brand new one in less
than 20 laps. Finally went to a custom Quarter Master racing clutch and
hydraulic release bearing which removed the release bearing and operating lever
from the system. Took some fabrication and experimenting but solved the problem
On ?Thursday?, ?December? ?21?, ?2017? ?08?:?33?:?44? ?PM? ?EST, Brad Eells via
Fot <fot at autox.team.net> wrote:
Ted,
Is there a Spitfire version of this disc?
Thanks!
Brad Eells
Sent from my iPhone
On Dec 21, 2017, at 4:27 PM, Doug Mitchell via Fot <fot at autox.team.net>
wrote:
Torn the center out of more discs than I care to remember. Second (and last)
time I ran race tires in an autocross I really destroyed it. This on a 'stock'
street Spit.
On Dec 21, 2017 7:09 PM, "fubog1 via Fot" <fot at autox.team.net> wrote:
Y'all ain't blowed one up good unless there's shrapnel out of the
bellhousing...!
Yes Merry Christmas!
Glen
-----Original Message-----
From: Joe Boruch via Fot <fot at autox.team.net>
To: fot <fot at autox.team.net>
Sent: Thu, Dec 21, 2017 6:02 pm
Subject: Re: [Fot] clutch disc blow-up picture
A stock clutch came apart for me at an autocross about 25 years ago and looked
about the same as the one that Ted sent. I don't recall if it was a DNF. It
was a street car that I drove to the autoX. Had to get a friend with a trailer
to give me a tow home. Merry Christmas! Joe(B)
From: Bill Tobin via Fot <fot at autox.team.net>
To: "Ted Schumacher" <tedtsimx at bright.net>, "FOT" <FOT at autox.team.net>
Subject: Re: [Fot] clutch disc blow-up picture
Date: Tue, 19 Dec 2017 20:28:09 -0500
I have one quite like that. Gave out after turn 11(last turn) on the last lap
at the Glen a while ago.
Coasted across the finish line, got the checker, and parked just before turn 1.
Wasn't a DNF! Did get towed in though.
Dick Stockton helped push the car into my trailer. When it was in an I was
looking for a block, Dick yelled "Put it in gear!" Smart a$$
Merry Christman and Happy New Year to all.
Cheers, Bill
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