Re: Manual Master Cylinder bore size - Disc/Drum
[Re: Mopar72Man]
#1687695
10/19/14 12:21 PM
10/19/14 12:21 PM
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Joined: Jan 2003
Posts: 1,482 Lake Orion, MI
goldduster318
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,482
Lake Orion, MI
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I have the same setup you do in a Duster with a 15/16" master cylinder from Dr. Diff. Had a 1 1/32 before and it's a lot better. That's what I would suggest.
'70 Duster 470hp 340/T56 Magnum/8 3/4 3.23 Sure-Grip
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Re: Manual Master Cylinder bore size - Disc/Drum
[Re: Mopar72Man]
#1687697
10/19/14 12:54 PM
10/19/14 12:54 PM
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Joined: Mar 2014
Posts: 40 upper So. CA
ntsqd
member
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member
Joined: Mar 2014
Posts: 40
upper So. CA
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What calipers do you have? If OE, what is their piston diameter?
I'm using wilwood dynapro's (way stiffer than dynalites of any flavor) with a late model Mopar 1-1/16 M/C and I find the pedal effort to be just about right. This is in a '65 A body, which sets up the next question.
What is the ratio of your pedal?
This is going somewhere, so please bear with me.
I used to swerve around my hallucinations, now I drive right thru them.
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Re: Manual Master Cylinder bore size - Disc/Drum
[Re: Mopar72Man]
#1687698
10/19/14 05:39 PM
10/19/14 05:39 PM
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Joined: Jan 2003
Posts: 25,823 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,823
Rio Linda, CA
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If you have the room for the additional pedal travel, go with a 15/16".
The INTERNET, the MISinformation superhighway
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Re: Manual Master Cylinder bore size - Disc/Drum
[Re: 72Swinger]
#1687702
10/21/14 12:49 AM
10/21/14 12:49 AM
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Joined: Mar 2014
Posts: 40 upper So. CA
ntsqd
member
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member
Joined: Mar 2014
Posts: 40
upper So. CA
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Without knowing the caliper piston area and pedal ratio it is impossible to choose the m/c size. Or suggest one.
I used to swerve around my hallucinations, now I drive right thru them.
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Re: Manual Master Cylinder bore size - Disc/Drum
[Re: 72Swinger]
#1687703
10/22/14 09:18 AM
10/22/14 09:18 AM
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Joined: Jan 2003
Posts: 5,443 Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,443
Indiana
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I also use the Dr. Diff 15/16" MC with "manual" disc (OE 11-3/4") up front and 11" OE drums in the rear.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Manual Master Cylinder bore size - Disc/Drum
[Re: Mopar72Man]
#1687706
12/13/14 12:28 AM
12/13/14 12:28 AM
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Joined: Jan 2003
Posts: 28,067 Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,067
Irving, TX
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It's time for the brake math spreadsheet. http://3gduster.com/brakes.htmlI've got an updated version available should anyone want it.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: Manual Master Cylinder bore size - Disc/Drum
[Re: feets]
#1687707
12/13/14 12:47 AM
12/13/14 12:47 AM
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Joined: Nov 2004
Posts: 25,050 Texas
GoodysGotaCuda
5.7L Hemi, 6spd
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5.7L Hemi, 6spd
Joined: Nov 2004
Posts: 25,050
Texas
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Quote:
It's time for the brake math spreadsheet.
http://3gduster.com/brakes.html
I've got an updated version available should anyone want it.
Those will do for some pretty basic numbers, adding relative weight transfer and rate of deceleration will help provide some input on how those numbers relate to the world. Our FSAE spreadsheets were in G of deceleration with force varying force input that could be plotted.
Don't forget units on your spreadsheet Feets. You mention pounds as one of your inputs, the rest should be Imperial/US or some can end up with a wonky pounds-MM and not know it.
I wasn't the guy in charge of braking/pedal box however, so I'm not the guru in this field by any means.
[spreadsheet goes up to 2G, but I just cut the screenshot short]
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Re: Manual Master Cylinder bore size - Disc/Drum
[Re: GoodysGotaCuda]
#1687709
12/13/14 10:48 PM
12/13/14 10:48 PM
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Joined: Jan 2003
Posts: 28,067 Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,067
Irving, TX
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Goody, it is possible to over engineer things. I sometimes have a hard time knowing when to stop "making it better."
What I posted is a very basic spreadsheet that I cobbled together late one night. As I stated above, I have an updated version available that does have units of measure listed. However, I do not have admin access to that link so I can't change it.
The spreadsheet won't win any Formula 1 races (especially with friction as 1) but it'll be more than enough for a car on the street.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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