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Author
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Topic: Dual Reservoir Master Cylinder Upgrade
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profalcon
Journeyman Posts: 30
From: Andrews AFB, MD
Registered: Feb 2001
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posted 02-14-2001 05:59 PM
   
Hey just wanted to say I was doing a little stock room research at my local parts store that my friend works at for a new master cylinder for my to be pro-street '61 Falcon. I kept reading about the mopar master cylinder being the hot thing and went to work in the Mopar section. I found that a '89 Dodge Aries M/C will bolt right up with minor mods. First modification - punch the mount holes out to 3/8" which is what the original has. Second take the stock plunger which has a 7/16" taper and with a file or bench grinder make it 3/8". It also has a plastic reservoir and aluminum body which gives it that trick, late model look!
Works awsome! I'll have some pictures up on my web site this weekend showing the steps I did! http://www.trawets.com/ click on the Project Falcon link. [This message has been edited by profalcon (edited 02-14-2001).]
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cpmaverick
Gearhead Posts: 1602
From: Auburn, AL.
Registered: Jan 2000
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posted 02-14-2001 08:20 PM
Cool profalcon! I actually have been looking into doing that except I have rear discs so It'll require a bit more research. Thanks for the info.
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profalcon
Journeyman Posts: 30
From: Andrews AFB, MD
Registered: Feb 2001
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posted 02-14-2001 08:36 PM
It will work with rear disc brakes also, if you want to proportion it just put an adjustable in. The total displacement of the Aries M/C is 1.3 ci if I can remember correctly. I'm going to be running 4w disc, Granada brakes in the front and Caddy Eldorado's in the rear. I talked to the folks at ECI and was told that you really don't need the proportioning v/v with 4w disc just if you are running a disc/drum setup or like me a pro-street setup, that way at the track, I can still smokem up and not be draggin' all that much brake![This message has been edited by profalcon (edited 02-14-2001).]
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cpmaverick
Gearhead Posts: 1602
From: Auburn, AL.
Registered: Jan 2000
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posted 02-15-2001 11:10 AM
How did you come up with this master cylinder? I plan on using a brake pressure guage on the OEM Versailles master cylinder and matching it to an aftermarket one. I don't want to guess because it would negate the advantage of the rear discs if I don't tap the full potential.
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profalcon
Journeyman Posts: 30
From: Andrews AFB, MD
Registered: Feb 2001
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posted 02-15-2001 04:41 PM
If you measure the diameter of the piston in the Versailles M/C and the multiplied force of the pedal (take the distance from the pedal to the pivot and the distance from the M/C link to the pivot divide the two) write these numbers down. Now take an estimated applied pressure (the pressure your foot is exerting) multiply this the the distance number. That is the applied force at the M/C. Take the diameter / 2 = radius. Radius * Radius * 3.1415927 = area of piston in M/C. Say you apply 50 lbs of force to the pedal with a distance of 13" that is 650 lbs applied to the M/C. The Aries M/C has a bore of 1" with a piston area of .785 sq ". multiply the two and that gives you about 510.25 psi at the M/C. There is really no need to use a gauge. Each wheel is going to have a piston area of X so if you wanted to know what is actually applied to the rotors just measure the diameter of the piston in the rotor, do the math for the area, and muliply that to the psi you get from the M/C and vwalla! At least this all works in theory, I work with Air Craft Hydraulics all day long and its the same principal as a hand pump. Just a thought!
PF ------------------
http://www.trawets.com
1999 F-150 4x4, 5" Superlift, 35" BFG M/T's
1961 2-dr Falcon -in work-
1954 F-100, 460, narrowed 9" [This message has been edited by profalcon (edited 02-15-2001).]
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cpmaverick
Gearhead Posts: 1602
From: Auburn, AL.
Registered: Jan 2000
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posted 02-17-2001 03:31 PM
You know, you're right. I have even done brake calculations before. I don't know why I didn't think of that, thanks!
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profalcon
Journeyman Posts: 30
From: Andrews AFB, MD
Registered: Feb 2001
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posted 02-17-2001 10:53 PM
No, problem... I believe there is a mathmatical solution to every mechanical problem... PF
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