 Identifying 19mm and 17mm master cylinders |
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| jamara |
 Dec 6 2006, 05:57 PM
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#1
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Member  Group: Members Posts: 63 Joined: 27-February 06 From: LA, CA Member No.: 5,645  |
I just bought what was advertised as a 19mm master cylinder off EBay. I got it last night in the mail and I believe it is a 17mm. Thing is, there is a 17 stamped (cast) onto the neck and a smaller 19 cast onto the underside of the body. So, which is it? I need to contact the seller and let them know they sent me the wrong one. But first I want to make sure I know what I am talking about.
Also, out of curiosity, is possible to convert a 17mm to 19mm by having a machine shop bore out the inside 2mm. I know a 19mm piston would need to be procured. Just wondering. Thanks! |
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| TravisNeff |
Dec 6 2006, 06:00 PM
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#2
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914 Guru Group: Members Posts: 5,082 Joined: 20-March 03 From: Mesa, AZ Member No.: 447 Region Association: Southwest Region 
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That would be a 17mm master Cyl.
I have never heard of anyone boring out an MC but I don't see how that would be impossible, I wouldn't do it though. |
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| davep |
Dec 6 2006, 06:33 PM
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#3
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914 Historian Group: Benefactors Posts: 5,225 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada  |
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| Borderline |
Dec 6 2006, 10:01 PM
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#4
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Senior Member Group: Members Posts: 720 Joined: 8-February 05 From: San Juan Bautista, CA Member No.: 3,577 Region Association: Northern California |
I could use a 17mm MC! Is it gud? How much did you pay for it? (IMG:style_emoticons/default/smile.gif)
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| michel richard |
Dec 7 2006, 06:34 AM
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#5
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Senior Member Group: Members Posts: 1,291 Joined: 22-July 03 From: Longueuil, Québec Member No.: 936 |
Usually, if it says "17" on the master cylinder, it's a 17 mm part. On the other hand, if it says "19" on it, it usually is a 19 mm part.
and if you want to know where this is coming from, check the following thread: http://www.914world.com/bbs2/index.php?showtopic=65307 (tongue in cheek, of course) |
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| davep |
Dec 7 2006, 08:58 AM
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#6
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914 Historian Group: Benefactors Posts: 5,225 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada |
QUOTE(jamara @ Dec 6 2006, 03:57 PM)  Also, out of curiosity, is possible to convert a 17mm to 19mm by having a machine shop bore out the inside 2mm. The MC's may be marked in mm, but they are most definitely an inch part. You would want to bore it out 1/16". On the other hand, I don't know if the bore is exactly the inch size, the piston is the inch size, or the average is the inch size. The size marking is on the neck that fits inside the pedal cluster. All other marks are just casting info, and must be ignored. You definitely got a 17mm part. |
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| tyler |
Dec 7 2006, 09:24 AM
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#7
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Member Group: Members Posts: 335 Joined: 24-September 03 From: southern california Member No.: 1,192 |
I'm having trouble finding a 19mm for my 911 upgrade. I thought it should be a 19mm from 1970-1973 911S but some of them seem to indicate there's a power booster. I'm also not fussy about an ATE instead of a Rabestos.
Anyone got a source for the right one? |
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| davep |
Dec 7 2006, 11:43 AM
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#8
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914 Historian Group: Benefactors Posts: 5,225 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada |
I'm pretty sure the power booster versions did not come as early as 1973. Pelican and others sell the correct one. They are easy to find, just not cheap anymore.
Rabestos? OMG |
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| jamara |
Dec 7 2006, 12:13 PM
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#9
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Member Group: Members Posts: 63 Joined: 27-February 06 From: LA, CA Member No.: 5,645 |
Thanks for all the feedback. I am quite certain this is a 17mm part as has been confirmed here. I am sure the seller is a stand up guy so I have requested a refund.
QUOTE(Borderline @ Dec 6 2006, 08:01 PM) I could use a 17mm MC! Is it gud? How much did you pay for it? (IMG:style_emoticons/default/smile.gif) Borderline, this unit really needs a rebuild and I paid as much for it as I would have paid for a rebuilt 17mm. So, no economy here. Thanks! James |
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| 914Sixer |
Dec 7 2006, 08:31 PM
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#10
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914 Guru Group: Members Posts: 9,040 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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The power boost did not come on line until the 74 911. The pedal assembly changed at the same time.
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| Hammy |
Dec 8 2006, 01:13 AM
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#11
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mr. Wonderful Group: Members Posts: 1,826 Joined: 20-October 04 From: Columbia, California Member No.: 2,978 Region Association: Northern California |
QUOTE(jamara @ Dec 6 2006, 03:57 PM) I just bought what was advertised as a 19mm master cylinder off EBay. I got it last night in the mail and I believe it is a 17mm. Thing is, there is a 17 stamped (cast) onto the neck and a smaller 19 cast onto the underside of the body. So, which is it? I need to contact the seller and let them know they sent me the wrong one. But first I want to make sure I know what I am talking about. I believe the MC size is on the neck. When I took out my old busted MC it had 19 stamped on the bottom middle. But on the neck was the 17. I guess the 19 was a number/code for something else? |
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