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removed stock proportioning valve
#1032839
07/15/11 12:55 AM
07/15/11 12:55 AM
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Joined: Jun 2005
Posts: 163 Iowa,US
4bbl
OP
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OP
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Joined: Jun 2005
Posts: 163
Iowa,US
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I have a 67 valiant dedicated drag car. I installed strange front discs and kept the rear drums. The new master cylinder and after market porp valve are going in now. Should the prop valve be on the rear or front brakes and why? 4.50s in the front, 10.50s in the rear 11s et.
4bbl
If you can't hear it coming what's the point.......
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Re: removed stock proportioning valve
[Re: 4bbl]
#1032840
07/15/11 01:02 AM
07/15/11 01:02 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I have a 67 valiant dedicated drag car. I installed strange front discs and kept the rear drums. The new master cylinder and after market porp valve are going in now. Should the prop valve be on the rear or front brakes and why? 4.50s in the front, 10.50s in the rear 11s et.
Put it on the fronts... with skinny fronts and big rear tires you want to keep the fronts from locking up on a spike of the pedal
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Re: removed stock proportioning valve
[Re: rebel]
#1032842
07/15/11 01:13 AM
07/15/11 01:13 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
on the other side of the coin i've watched rears locking up with too much rear bias. my prop valve which did serve the fronts now serves the rears. to me, it feels more stable than it did before.
It takes very little effort to lock up a set of skinny fronts and it doesnt take alot of skidding to have them blow out.... yes I can lock up the rears but it takes a pretty big spike on the pedal
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Re: removed stock proportioning valve
[Re: Dabee]
#1032844
07/15/11 11:19 AM
07/15/11 11:19 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Mine is installed on the rear circuit. It’s been that way for years with no problems. But what Mike said about the installing on the front circuit makes sense.
One other thing when you install it on the fronts... if you lock up the fronts... you dont have steering while locked.... to me its always been a physics thing... you have 2 or 3 times the tire width over stock(even more) which can do MUCH MORE braking VS a much skinnier tire.... most guys will hit the pedal pretty hard on the top end to keep from a break out and can lock the fronts without the prop valve on them... Also if you notice that our race cars dont get the front end dive to them (due to the springs) like a street car with a nice ride rate... so we dont get the 70% front braking like a street car... also a adjustable prop valve is nothing more than a orifice to SLOW the fluid flow... given enough time it will match the other pressure(based on the orifice size its set at)
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Re: removed stock proportioning valve
[Re: jcc]
#1032847
07/15/11 09:33 PM
07/15/11 09:33 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I wonder is lack of "dive" you mentioned is caused by what? And a skinny tire half the width of a rear tire will have more traction then the wider rear tire if it has twice the weight (say from weight transfer, and the fact it is not linaer ) And the need for steering becomes pretty useless when a locked rear end tries to swap ends. I say there is not cut dry method, he should test under controled conditions for what the driver and the car needs. I am puzzled as in situation an experienced driver in a properly biased set-up would keep fronts locked long enough to blow out other then a panic situation.
Mount your front tires on the rear and tell me which has greater traction... yes it does have twice the weight per sq in but the rears have MANY times the sq inces... as for a person holding the fronts long enough to blow them... they dont know they're locked up... do it what ever way you like
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