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 Post subject: Clutch Actuation
PostPosted: Thu Aug 01, 2019 4:37 am 
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Joined: Mon Jan 05, 2015 8:45 am
Posts: 180
So, watching the F1 Grand Prix and videos of many of the top Production drivers, I started fantasize about some changes to my car. One of them was changing how the clutch was actuated.

If someone is running a dog-ring transmission and is very skilled in the downshifting such that the clutch is not used, the clutch pedal is just kinda in the way. Is there anything that stops one from removing the clutch pedal and actuating it via a different type of lever, say on the back of the steering wheel?

I went in search of something in the GCR to tell me know, but only came up with this:

9.1.5.i.5. Clutch assemblies, clutch linkage and release bearings are unrestricted. Carbon clutch components are prohibited.

Which indicates to me that this would be allowed (and could even allow for an electromechanical assist). Anyone see to the contrary?

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Bill H
92 Saturn SL2 - SCCA F-Production


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 Post subject: Re: Clutch Actuation
PostPosted: Thu Aug 01, 2019 5:10 am 
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Joined: Thu Feb 28, 2019 5:57 am
Posts: 74
planet6racing wrote:
9.1.5.i.5. Clutch assemblies, clutch linkage and release bearings are unrestricted. Carbon clutch components are prohibited.

Greg's Rule #3 For Writing Rules (the Roffe Corollary)* states, "If it says you can, then you bloody well can!"

However...

You are asking to change the clutch actuation system. And I don't see where that's allowed.

Am I missing a specific reference in the PCS to "IIDSYCTYC"?



*https://improvedtouring.com/showthread.php?22779-How-To-Write-a-Rule


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 Post subject: Re: Clutch Actuation
PostPosted: Thu Aug 01, 2019 6:23 am 
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Joined: Fri Nov 13, 2009 9:12 pm
Posts: 1301
Location: Cbus, OH
Greg Amy wrote:
Am I missing a specific reference in the PCS to "IIDSYCTYC"?

No, you're not, it applies in Prod too, which is why I loathe wording in the GCR that revolves around stating what you're NOT allowed to do. It's redundant, and not the point of the rulebook.

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kevin

ruckracing honda's:
'15 & '10 Runoffs FP Champion
'10, '09, & '08 ARRC ITA/ITB Champion


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 Post subject: Re: Clutch Actuation
PostPosted: Thu Aug 01, 2019 6:33 am 
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Joined: Fri Dec 23, 2011 6:59 am
Posts: 1315
Location: Spring Hill, FL.
Falls under clutch linkage IMHO.

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Mike Ogren/Protech Racing, http://www.FWDracingguide.com http://www.ogren-engineering.com/ 352.428-8983 mogren@tampabay.rr.com


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 Post subject: Re: Clutch Actuation
PostPosted: Thu Aug 01, 2019 6:58 am 
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Joined: Mon Jan 05, 2015 8:45 am
Posts: 180
Not changing the actuation system - could still use a Tilton hydraulic system. Just changing the linkage and moving it to a different location.

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Bill H
92 Saturn SL2 - SCCA F-Production


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 Post subject: Re: Clutch Actuation
PostPosted: Thu Aug 01, 2019 8:12 am 
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Joined: Sun Jan 23, 2011 4:54 am
Posts: 1963
Just a thought, but you'd have to be a gorilla to be able to actuate the clutch by hand. even with a long pedal it's some effort on my leg to release the clutch. now imagine doing that with your arm while you're trying to get off grid..

and unless there's something about your car that's very unergonomic (is that a word?), there is plenty of room in my footwell for my left leg to do rest away from the clutch pedal. when I'm not using the clutch, there's a dead pedal/footrest on the left side, and there's the brake pedal on the right for when I left foot brake.

Obviously each car and driver is different so you may not have room for your left foot anywhere but the clutch pedal, but otherwise my personal opinion is that you're attempting to solve a problem that doesn't exist. :shrug:

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Houston Region
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 Post subject: Re: Clutch Actuation
PostPosted: Thu Aug 01, 2019 8:20 am 
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Posts: 180
Agreed about area in the footwell - definitely more of a thought exercise.

Since linkage is free, why not add a servo assist to not need to be a gorilla?

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Bill H
92 Saturn SL2 - SCCA F-Production


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 Post subject: Re: Clutch Actuation
PostPosted: Thu Aug 01, 2019 9:19 am 
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Joined: Thu Feb 28, 2019 5:57 am
Posts: 74
kruck wrote:
Greg Amy wrote:
Am I missing a specific reference in the PCS to "IIDSYCTYC"?

No, you're not, it applies in Prod too, which is why I loathe wording in the GCR that revolves around stating what you're NOT allowed to do. It's redundant, and not the point of the rulebook.


How does it apply to Prod? AFAIK, it's not in the GCR (is it?), so if it's not in the PCS then it doesn't apply.

We may accept or assume that it applies, but unless it's specifically called out...?


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 Post subject: Re: Clutch Actuation
PostPosted: Thu Aug 01, 2019 10:50 am 
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Joined: Sun Jan 23, 2011 4:54 am
Posts: 1963
planet6racing wrote:
Agreed about area in the footwell - definitely more of a thought exercise.

Since linkage is free, why not add a servo assist to not need to be a gorilla?

As if prod cars aren't finicky and problematic enough, now we're adding electronic and hydraulic widgets to move a mechanical lever in the engine bay? sounds like more problems than solutions when you're at the track and this whizzbang servo doesn't want to cooperate.

...... I'm an electrical engineer and even I hate adding electronics in a race car.... ;)

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Houston Region
EP 1st Gen RX7
STU Nissan 240SX


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 Post subject: Re: Clutch Actuation
PostPosted: Sun Aug 04, 2019 11:08 am 
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Joined: Wed Oct 28, 2009 9:24 am
Posts: 854
With my mechanical engineer hat on:

A linkage is not an actuator. It transfers force and motion.

With my rules lawyer hat on, from 1st page of PCS in GCR:

9.1.5.D.1. An addition, modification, substitution or removal, must not be made unless specifically authorized.


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