19mm master cylinder, from a 17 mm master cylinder! |
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19mm master cylinder, from a 17 mm master cylinder! |
bondo |
May 12 2007, 03:35 PM
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#1
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Practicing my perpendicular parking Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California |
I'm in the process of boring out a 17mm master cylinder and rebuilding it with a 19mm rebuild kit. Has anyone here ever done that?
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bondo |
May 12 2007, 07:39 PM
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#2
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Practicing my perpendicular parking Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California |
Nobody's going to tell me it can't be done? Trailblazing isn't any fun if nobody says you can't do it. (IMG:style_emoticons/default/biggrin.gif)
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sww914 |
May 12 2007, 07:40 PM
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#3
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Advanced Member Group: Members Posts: 2,439 Joined: 4-June 06 Member No.: 6,146 Region Association: None |
It can't be done.
You'll die in a mashed up ball of flames! Pox be upon you. |
markb |
May 12 2007, 07:57 PM
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#4
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914less :( Group: Members Posts: 5,449 Joined: 22-January 03 From: Nipomo, CA Member No.: 180 Region Association: Central California |
ya gonna die! ya gonna die! ya gonna die!
Just make sure you add some ss brake lines to make absolutely sure. (IMG:style_emoticons/default/biggrin.gif) Don't ya just love us locals? |
John |
May 12 2007, 08:15 PM
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#5
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member? what's a member? Group: Members Posts: 3,393 Joined: 30-January 04 From: Evansville, IN (SIRPCA) Member No.: 1,615 Region Association: None |
Why?
Why not get a boneyard 19mm and rebuild that? |
bondo |
May 12 2007, 08:19 PM
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#6
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Practicing my perpendicular parking Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California |
That's better. (IMG:style_emoticons/default/biggrin.gif)
Boneyard 19mm master cylinders aren't free... I had the 17mm laying around, and I was bored at work. I make your average CSOB look luxuriant. (IMG:style_emoticons/default/laugh.gif) |
JPB |
May 12 2007, 08:19 PM
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#7
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The Crimson Rocket smiles in your general direction. Group: Members Posts: 2,927 Joined: 12-November 05 From: Tapmahamock, Va. Member No.: 5,107 |
How ya gonna do that mister smarty pants? Are ya some kinda wize machinist dude or sumtin? Why stop at 19mm why not go 19.5mm just to be better than some of us ey? If i were that smart I'd make like a 100mm out of a 17mm thingy you are drilling your tool thingy into it like that your doing that thingy there. (IMG:style_emoticons/default/beer.gif)
It can't be done, it just can't I know it can't cuz the dude at Advanced said so. There you! |
John |
May 12 2007, 09:34 PM
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#8
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member? what's a member? Group: Members Posts: 3,393 Joined: 30-January 04 From: Evansville, IN (SIRPCA) Member No.: 1,615 Region Association: None |
Are 19 mm master cylinders bored to some strange measurement (18.7 or something)????
It sounds like your time is worth nothing. |
skline |
May 12 2007, 09:37 PM
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#9
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Born to Drive Group: Members Posts: 7,910 Joined: 26-December 02 From: Costa Mesa, CA Member No.: 17 Region Association: Southern California |
In my opinion, not that is counts for much, but why would you take a chance with something like brakes? I know I wouldnt want to chance it, what if it really cant be done and you think it's ok and you are flying and absolutely need to stop fast and it gives out? Then what? I just wouldnt do it. Again, that is just my opinion. (IMG:style_emoticons/default/smile.gif)
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SirAndy |
May 12 2007, 09:47 PM
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#10
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Resident German Group: Admin Posts: 41,636 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
In my opinion, not that is counts for much, but why would you take a chance with something like brakes? I know I wouldnt want to chance it, what if it really cant be done and you think it's ok and you are flying and absolutely need to stop fast and it gives out? Then what? I just wouldnt do it. Again, that is just my opinion. (IMG:style_emoticons/default/smile.gif) (IMG:style_emoticons/default/agree.gif) |
r_towle |
May 12 2007, 10:52 PM
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#11
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
if your a machinist minded kinda guy, and you have the tools, why not.
Somewhere in the world there is a machinist boring them out for the final sizing from the cast product...so just make sure you know the spec. It would be nice to measure a spare one that might be junk somewhere to see the proper size and the proper clearance... I bet you could check ATE and see if there is a diagram. Rich |
bondo |
May 12 2007, 11:02 PM
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#12
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Practicing my perpendicular parking Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California |
I am basing the final size on the size of the piston. I'm basically making it the same amount larger than the 19mm piston as the 17mm bore was larger than the 17mm piston. I don't remember the exact measurement, but it was less than 19mm. I'm drilling it undersize and honing it to the final size to make sure it has a good finish. If it doesn't come out perfect, I won't run it. (IMG:style_emoticons/default/smile.gif)
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TonyAKAVW |
May 12 2007, 11:18 PM
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#13
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That's my ride. Group: Members Posts: 2,151 Joined: 17-January 03 From: Redondo Beach, CA Member No.: 166 Region Association: None |
Well, I say go for it but test it out thoroughly after you've got it done and then try it out carefully, look for leaks, etc. The thing is that if its done incorrectly it should be obvious immediately.
Just be careful. And yes you will die. eventually |
burton73 |
May 12 2007, 11:23 PM
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#14
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burton73 Group: Members Posts: 3,520 Joined: 2-January 07 From: Los Angeles Member No.: 7,414 Region Association: Southern California |
The casting may be bigger on the 19mm. I bought a brand new 19mm for my 6 instead of rebuilding it. You need the size of the casting. If it is bigger on the 19mm you should not dick with this. Used 19mms can be very cheep. I have one
Bob |
orange914 |
May 12 2007, 11:42 PM
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#15
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http://5starmediaworks.com/index.html Group: Members Posts: 3,371 Joined: 26-March 05 From: Ceres, California Member No.: 3,818 Region Association: Northern California |
i'll stand in back of his work... way in back (IMG:style_emoticons/default/beerchug.gif)
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andys |
May 12 2007, 11:52 PM
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#16
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Advanced Member Group: Members Posts: 2,165 Joined: 21-May 03 From: Valencia, CA Member No.: 721 Region Association: None |
You'll have to bore it, then hone it. If you have the correct mandrel for the hone along with the appropriate sizing sleeve, then you stand a chance at success (a hand held hone is not nearly good enough). Remember, you're not trying to clean up a little bit of rust or pitting, but you are removing the radial machining ridges so the work must be correctly done. Of course you still have to determine if the 17mm casting has enough material to safely remove 2mm on the diameter.
Good luck, Andys |
bondo |
May 13 2007, 12:39 AM
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#17
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Practicing my perpendicular parking Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California |
The 19mm and the 17mm are identical castings, except for the "17" and the "19" cast into the bottom. I have a used 19mm in my other 914 and have held them side by side. (which is how I got the idea)
Personally, I'd rather have a rebuilt 19 made from a 17 than a used or rebuilt 19. You can never get the 19 as tight as when it was new, unless you sleeve it. |
TonyAKAVW |
May 13 2007, 12:58 AM
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#18
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That's my ride. Group: Members Posts: 2,151 Joined: 17-January 03 From: Redondo Beach, CA Member No.: 166 Region Association: None |
QUOTE You can never get the 19 as tight as when it was new, unless you sleeve it. TWSS |
JPB |
May 13 2007, 06:32 AM
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#19
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The Crimson Rocket smiles in your general direction. Group: Members Posts: 2,927 Joined: 12-November 05 From: Tapmahamock, Va. Member No.: 5,107 |
Are 19 mm master cylinders bored to some strange measurement (18.7 or something)???? It sounds like your time is worth nothing. Zing!! (IMG:style_emoticons/default/av-943.gif) All kiding aside though, I bet he can get a better product if he did it himself. (IMG:style_emoticons/default/beer.gif) |
So.Cal.914 |
May 13 2007, 08:28 AM
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#20
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"...And it has a front trunk too." Group: Members Posts: 6,588 Joined: 15-February 04 From: Low Desert, CA./ Hills of N.J. Member No.: 1,658 Region Association: None |
Zing!! (IMG:style_emoticons/default/av-943.gif) All kiding aside though, I bet he can get a better product if he did it himself. (IMG:style_emoticons/default/beer.gif) That or a horrable death, test it some place safe. Do you have a e-brake? |
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