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Master cylinder change

Posted by Michael Oritt

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Master cylinder change #1
Michael Oritt Lusby MD, USA 1958 Elva Courier	Posted: May 06, 2012 09:18PM Registered: 5 years ago Posts: 128

In order to get a bit more legroom in the Courier I am considering redoing my toebox and changing to compact master cylinders and I have a question that perhaps someone can answer:

Currently I have Wilwood 3/4" bore master cylinders model 260-3374 which are 5.56" long with a stroke of 1.10". The outlet fitting is very close to the left front wheel inner fender.

The Wilwood 3/4" bore compact master cylinders model 260-10372 are 3.36" long with a stroke of 1.12" which would allow me to move the front wall of the toebox 2" forward and still clear the inner fender.

Looking through the Wilwood website pages the only other difference I can see between the two cylinders is that while the regular cylinder has a 3/8"-24 outlet the compact cylinder has a 1/8"-27NPT outlet. I currently have a reduction fitting on the end of the cylinders reducing down to 1/8" so my question is whether or not my changing down to the compact cylinder would require any other changes to the current brake system plumbing or would have any effect on braking effort, balance, etc.

Thanks in advance--Michael Oritt

Edited 1 time(s). Last edit at 05/06/2012 09:19PM by Michael Oritt.

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Re: Master cylinder change #2
malcox Malcolm Cox Napa, California, USA	Posted: May 07, 2012 09:41PM Registered: 2 years ago Posts: 68

Hi Michael
Did you check out Tilton 75 series?
http://www.tiltonracing.com/content.php?page=list2&id=23&m=b

Body length: 3.2" (mounting flange-to-outlet port)
Outlet ports: AN-3 (3/8"-24)

I have one on backorder from Summit (for about 4 wks !)
BTW, I ordered and returned Howe Racing master cylinder, also a shorty
http://www.summitracing.com/parts/HRE-524412/
because it only came with 1/8"-27NPT outlet

Cheers
Malcolm

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Re: Master cylinder change #3
blackmgb Fred McConnell Hollidaysburg, Pennsylvania, USA 1992 Mazda Miata NA "MAC"	Posted: May 08, 2012 06:04AM Registered: 6 years ago Posts: 5,194

Malcolm, you must be ordering the 3/4" Tilton. They are out everywhere, but I've got one with 33 laps on it if you need it. grinning smiley

it was too big for me.

I really like the 75 series. Compact and easy to work with.

2012 SCCA FP MARRS Champion

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Re: Master cylinder change #4
malcox Malcolm Cox Napa, California, USA	Posted: May 08, 2012 12:14PM Registered: 2 years ago Posts: 68

Yes, its 3/4
Did you mean that this dia is too large for the MGB? what was your experience?

Thanks for the offer Fred, but I am in no hurry, it is for the 2nd vintage race MGA I am building.

BTW, if anyone wants a solid model (solidworks) of the MGA pedal box platform, with pedals, (optional Girling, Tilton, Howe) master cylinders, tilton balance bar etc, let me know, can also export IGES etc.
(yeah I know, too much computer time, not enough track time !)

Cheers
malcolm

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Re: Master cylinder change #5
blackmgb Fred McConnell Hollidaysburg, Pennsylvania, USA 1992 Mazda Miata NA "MAC"	Posted: May 08, 2012 12:30PM Registered: 6 years ago Posts: 5,194

No, too big for my preference on the Miata. I like a more Cadillac feel with my pedal.

2012 SCCA FP MARRS Champion

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Re: Master cylinder change #6
Michael Oritt Lusby MD, USA 1958 Elva Courier	Posted: May 08, 2012 12:42PM Registered: 5 years ago Posts: 128

Hey, I'm glad you guys are having a good time yacking back and forth but I DID ask a question here!

Anyway, not having heard anything and being by nature impatient I ordered the compact combo Wilwoods and assume that no changes in wheel cylinders will be necessary since the master cylinder bore remains the same. I hope I'm right--in any case I am not going to address this modification until after the Jefferson.

Best--Michael Oritt

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Re: Master cylinder change #7
blackmgb Fred McConnell Hollidaysburg, Pennsylvania, USA 1992 Mazda Miata NA "MAC"	Posted: May 08, 2012 01:00PM Registered: 6 years ago Posts: 5,194

Hey Michael, good luck winking smiley

2012 SCCA FP MARRS Champion

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Re: Master cylinder change #8
Elva Bob Bob Lembcke Florida, USA	Posted: May 09, 2012 07:58PM Registered: 2 years ago Posts: 114

Mike...

Sounds like your change should be ok. Don't see any issue with some steps in tubing/bore size right at cly. as long as everything can be matched up.

Basically, there is min. flow in these systems, so no pressure drop issues... closed system, pressure at one point will be quickly reflected through out.

Guess I'm somewhat dated on my Courier. I retained most of the original Elva pedal assembly, used AP MC/s with rear/up facing tubing outlets, and reinforced the pedal supports to keep from flexing during panics... adapted a tilton balance bar to Elva pedal. All not very ergonomic, but had the parts...just beefed up stock stuff...

Have to go look, but one of my m/c is .7 bore (think rears...leaked and had to get kit recently, not cheap from pegasus...about 26 bucks...).

Bob L.

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