 Brake Master Cylinder, 17mm vs 23mm |
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| LotusJoe |
 Sep 20 2010, 04:29 PM
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#1
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Europa Twink Driver  Group: Members Posts: 406 Joined: 30-November 09 From: Southern California Member No.: 11,085 Region Association: Southern California  |
I'm considering upgrading my master cylinder. I have installed the bigger BMW 320 Front Calipers and have Stock Calipers on the rear. I see from other threads that the 19mm master cylinder is a common upgrade, but what about 23mm. Automotion sells a 23mm as an upgrade, but it seem to me that it may to much for my application.
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| RJMII |
Sep 20 2010, 05:27 PM
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#2
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Jim McIntosh Group: Members Posts: 3,125 Joined: 11-September 07 From: Sandy, Utah Member No.: 8,112 Region Association: None |
More math done...
the surface area of the 17mm mastercylinder is 1.05 square inches. The surface area of the 19mm mastercylinder is 1.18 square inches. The surface area of the 23mm mastercylinder is 1.42 square inches. The total surface area of the pistons in your setup is 20 square inches. In order to move the 8 calipers the .004 to .008 inches necessary to stop your car, you would need to move the piston in the m/c the following distances for each of the m/cs: 17mm: .076 - .152 inches 19mm: .068 - .136 inches 23mm: .056 - .113 inches edit: Take note, this is the piston movement required. The pedal movement increases according to the lever formula... (note to self: measure pedal arm lengths and include in app) My personal setup has the 48mm pistons up front as well, and I really like the feel of the 19mm m/c that I have. |
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Posts in this topic
LotusJoe Brake Master Cylinder Sep 20 2010, 04:29 PM
underthetire Do a search, plenty of arguments posts about it. Sep 20 2010, 04:46 PM RJMII With the BMW calipers, the piston diameter is 48 m... Sep 20 2010, 04:48 PM
LotusJoe It would appear I'm better off staying with th... Sep 20 2010, 04:57 PM Tom_T
It would appear I'm better off staying with t... Sep 22 2010, 05:15 PM RJMII
Not necessarily,
The formula I am still workin... Sep 20 2010, 05:04 PM pcar916 The fluid volume is a key element as is the pad ar... Sep 20 2010, 05:28 PM McMark Read this classic thread.
RIP Lapuwali. Gone too... Sep 20 2010, 06:31 PM RJMII
Read this classic thread.
RIP Lapuwali. Gone to... Sep 20 2010, 06:38 PM Brett W I ran the stock front calipers on the rears and 32... Sep 22 2010, 06:44 PM bmtrnavsky I am running a 19MM Master cylinder on my car with... Sep 22 2010, 07:14 PM Todd Enlund Slight correction: Pressure in a closed system is... Sep 23 2010, 12:08 AM RJMII
Slight correction: Pressure in a closed system i... Sep 23 2010, 08:49 AM Todd Enlund
Slight correction: Pressure in a closed system ... Sep 23 2010, 12:16 PM Racer Chris
Slight correction: Pressure in a closed system i... Sep 23 2010, 11:22 AM Todd Enlund
Slight correction: Pressure in a closed system ... Sep 23 2010, 12:10 PM Racer Chris
Not since Jim edited his post and changed "p... Sep 23 2010, 01:25 PM ellisor3 I found this interesting article a while ago. It i... Sep 23 2010, 05:44 AM jhadler One of more often overlooked issues surrounding a ... Sep 23 2010, 09:34 AM RJMII blah blah blah nit pick blah blah blah.
I did th... Sep 23 2010, 01:10 PM ruby914 I have the 320I brakes and took off the 23mm MC an... Sep 24 2010, 01:05 AM |
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