Disc brakes

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Disc brakes

Postby BLS » September 12th, 2017, 12:25 am

Saw this tonight in the Oct minutes:

"FV 1. #22456 (Formula/Sports Racing Committee) Disc Brakes in FV - Member Survey At the recommendation of the FV ad hoc committee, the CRB recommends the option of disc brakes in FV. Add the following:
9.1.1.4.D. Front and/or rear brake drums and backing plate assemblies may be replaced with a disc brake conversion assembly as an option. The front spindle/steering knuckle, rear axle, axle tube, bearing housing and bearing retainer/seal assembly must remain per GCR part 9.1.1. A spacer plate or a portion of the rear caliper support may be fitted beneath the bearing retainer to replace the backing plate dimension. Any ferrous alloy, unvented rotor may be used, but must have a maximum diameter of 11.75 in. and a minimum thickness of 0.20 in. The otherwise smooth rotor may have a maximum of three pad cleaning grooves per side. Any ferrous or aluminum alloy caliper and caliper support may be used. The caliper must have no more than four pistons and weigh a minimum of 1.65 lbs. Brake pads are free. Any hub assembly may be used as long as it can be fitted with part 9.1.1. wheels. "

https://dk1xgl0d43mu1.cloudfront.net/user_files/scca/downloads/000/037/970/October2017.PrelimMinutes.pdf?1505170766
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Re: Disc brakes

Postby FV80 » September 12th, 2017, 9:06 am

WOW... things are happening ... and without ANY member input too.... at least so far. I wonder which specific parts the FVC had in mind when they wrote the rule? A caliper at 1.65 lbs seems somewhat unlikely .. even if it was aluminum. Since this is preliminary minutes, maybe the intent was to ask for a SURVEY of the PROPOSED rule? Kinda almost looks like that to me, but it says ADD THE FOLLOWING....
Maybe should read "PROPOSE TO ADD THE FOLLOWING..."??
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Re: Disc brakes

Postby FV80 » September 12th, 2017, 9:24 am

FWIW, I posted some pictures of the conversion kit I installed and tested back in '06. It was a FRONT ONLY kit that cost ~$240 delivered to my door. I don't recall the weights, but it wasn't far off of a wash. It DID require different wheels though. The newer 4 hole, 5.5 x 15" VW wheels from the ~'69 models. At that time, kits for Wide5 were at least double that cost.
http://www.wedgeracing.com/disc/discpics.htm
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Oh yeah.. it took about 5 hours of work to get it installed the first time, but only about an hour to convert back to drums after the test. I couldn't really tell any difference, but only ran it for one test session.
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Re: Disc brakes

Postby BLS » September 12th, 2017, 9:13 pm

Steve, been out all day so just seeing your comments. I thought the way it was written was pretty interesting. And timely. I guess I'll hold off on purchasing new drums and high priced shoes until I see what this becomes.
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Re: Disc brakes

Postby hardingfv32 » September 15th, 2017, 12:23 pm

I believe the goal is a well designed race setup. Calipers and discs from say Wilwood. The caliper weight is possible with $100 Wilwood calipers.

We need more information about where the hubs are going to come from. I would imagine the design is for billet CNC units. These hubs must be heavy as there is very little chance that the complete system will be lighter than the current drum arrangement. I think this would be necessary to negate any possible perception of a performance improvement.

I think the proposal is trying to be open to the full spectrum of design possibilities. The heart of the survey/member input is whether you approve of disc brakes on a FV.

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Re: Disc brakes

Postby BLS » September 15th, 2017, 10:11 pm

Brian, yes I agree, the hub is the issue. As near as I can tell, the one piece hubs that keep the track standard are both heavy and have possible strength issues. Every hub that is two piece and built to higher strength seems to have a track increase.
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