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> NEW Group Buy 914 Master Cylinders $110 each, GB CLOSES TODAY 11/15/17 The rest will ship by 11/2
Mike D.
post Dec 3 2015, 01:57 PM
Post #61


OK, It runs now, and pretty good too!
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I want 1 too, or 2 too, maybe. (IMG:style_emoticons/default/smile.gif)
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80cap
post Dec 3 2015, 02:18 PM
Post #62


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I also am in for one
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mbseto
post Dec 3 2015, 02:26 PM
Post #63


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I think there was another thread recently cautioning against getting a larger master cylinder with the stock calipers. IIRC, the problem was that braking becomes less progressive. My gut tells me 17mm to 19mm is probably OK, can someone share practical experience?
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Dave_Darling
post Dec 3 2015, 06:23 PM
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When you install a larger master cylinder, you reduce your "hydraulic advantage" over the caliper pistons. It's almost exactly the same effect as moving the pivot point of the brake pedal.

The 19mm M/C has 25% more area to the piston than the 17mm one does. That means to get the same clamping force at the calipers, you have to exert 25% harder, though the pedal moves 25% less distance.

Most people seem to agree that the 19mm is a reasonable swap, but going up to 23mm (which I believe the earlier thread was talking about) is a Very Bad Idea unless you are significantly upgrading the caliper piston sizes.

--DD
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mb911
post Dec 3 2015, 07:21 PM
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I would also be in for one
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Mark Henry
post Dec 3 2015, 08:14 PM
Post #66


that's what I do!
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I'm in for one for sure...maybe put me down for two.


I don't think you'll have any trouble getting rid of the extra one if I don't take it.
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7TPorsh
post Dec 4 2015, 02:33 PM
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I'd be in for a 17mm.
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PotterPorsche
post Dec 4 2015, 03:37 PM
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I'm in for 1
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Mark Henry
post Dec 4 2015, 04:04 PM
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QUOTE(7TPorsh @ Dec 4 2015, 03:33 PM) *

I'd be in for a 17mm.


If I get the jist Mikey (Mark) trying to put together the numbers for a fair size production run, so he's likely he's going to only be able to do the one size, 19mm.
19mm was likely chosen as it's the best size for a large enough production run to re-coop his investment from both the 914 and 911 crowd.
Likely he can't get the same per unit price on smaller runs for different sizes.
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jcd914
post Dec 4 2015, 04:17 PM
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QUOTE(Mark Henry @ Dec 4 2015, 02:04 PM) *

QUOTE(7TPorsh @ Dec 4 2015, 03:33 PM) *

I'd be in for a 17mm.


If I get the jist Mikey (Mark) trying to put together the numbers for a fair size production run, so he's likely he's going to only be able to do the one size, 19mm.
19mm was likely chosen as it's the best size for a large enough production run to re-coop his investment from both the 914 and 911 crowd.
Likely he can't get the same per unit price on smaller runs for different sizes.


(IMG:style_emoticons/default/agree.gif)

That is what he says back in post 38.

QUOTE(Mikey914 @ Oct 22 2015, 01:13 PM) *

QUOTE(Mikey914 @ Oct 21 2015, 11:37 PM) *

QUOTE(Porscheless @ Oct 21 2015, 09:59 PM) *

I am in....Is there a larger(23? )mm option?Is this even necessary if i do a larger engine

Possible,
I'll be discussing with Eric tomorrow. Going to see how we can optimize the program.
Mark

Looks like we are best at sticking with the 19mm for the time being. Yes we will be proceeding on these. May even make some improvements (IMG:style_emoticons/default/aktion035.gif)
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7TPorsh
post Dec 4 2015, 04:27 PM
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QUOTE(Mikey914 @ Oct 22 2015, 05:12 PM) *

QUOTE(BillC @ Oct 22 2015, 07:27 AM) *

I'd like to get one, too.

However, if at all possible, I'd prefer to get one that is the correct stock size for my '73 1.7, since I'm planning to keep it all-stock. Any chance of doing a second GB at some point for the original size?


What is the original size, anyway? 17mm?

I'll get you covered, trust me (IMG:style_emoticons/default/biggrin.gif)


Guess I should have quoted. i assumed 17mm would be covered at some point. Can't you just sleeve the cylinder down to 17mm? I obviously have no clue.

"I would gladly pay you today for a 17mm on Tuesday." (IMG:style_emoticons/default/smile.gif)
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Mikey914
post Dec 4 2015, 10:29 PM
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These will be 19mm.

Progress is that we are working on the tooling for the casting now. We have located a new ATE sample and are reverse engineering it. There are over 20 parts we will need to fabricate to make this we have 3 done at this point. Just like making a V2 rocket, but we will be doing some extensive testing on it to. It's being made with under our new manufacturing division. It will be a fully engineered part.
(IMG:style_emoticons/default/biggrin.gif)
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02loftsmoor
post Dec 5 2015, 12:06 AM
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QUOTE(Mikey914 @ Oct 21 2015, 05:22 PM) *

I'm working on having new master cylinders made for the 914's. They are going to be 19mm to crossover for the 911 also. Now you can get a quality part at a reasonable price. These are about 90 days out, but they will be a quality product, that is fully engineered, not some junk imported from China.

Who's in?

I'm in
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eric914
post Dec 5 2015, 10:34 AM
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Bossman
post Dec 5 2015, 10:54 AM
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restore2seater
post Dec 5 2015, 11:00 AM
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Future 914 copilot.
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Add 1 to the list for me.
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kid914
post Dec 5 2015, 11:43 AM
Post #77


ALWAYS lead...NEVER follow!!!!
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me likes new parts...even more when they are improved....
in for 1... (IMG:style_emoticons/default/first.gif) (IMG:style_emoticons/default/beerchug.gif)
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TC 914-8
post Dec 31 2015, 12:07 PM
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Mark I'm in for 1 if they are still available ?!?!
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Mikey914
post Dec 31 2015, 02:56 PM
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Actually not ready yet. SO no problem.
Mark
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TC 914-8
post Dec 31 2015, 06:42 PM
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QUOTE(Dave_Darling @ Dec 3 2015, 04:23 PM) *

When you install a larger master cylinder, you reduce your "hydraulic advantage" over the caliper pistons. It's almost exactly the same effect as moving the pivot point of the brake pedal.

The 19mm M/C has 25% more area to the piston than the 17mm one does. That means to get the same clamping force at the calipers, you have to exert 25% harder, though the pedal moves 25% less distance.

Most people seem to agree that the 19mm is a reasonable swap, but going up to 23mm (which I believe the earlier thread was talking about) is a Very Bad Idea unless you are significantly upgrading the caliper piston sizes.

--DD

Dave,
My car has the Brembo Boxster calipers up front, not sure if the MC was ever changed. My petal is still soft after many bleedings and purgings. You think a 19mm is a good choice? Or 23mm that came w boxters?
I have stocks w V kit in rear
Just curious

T
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