 Caliper Question - Calling Eric, 914/4 vs. 914/6 rear |
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| bigkensteele |
 Dec 30 2013, 09:53 PM
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#1
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Major Member  Group: Members Posts: 2,197 Joined: 30-August 04 From: Cincinnati, OH Member No.: 2,660 Region Association: South East States 
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I understand that the piston diameter is larger on the six caliper, but externally, they appear to be very similar if not identical.
My question is why can't a rear four caliper be bored to the same piston diameter as the six? Not enough meat on the bone? Mind you, I understand that if it could be done, PMB probably would not have gone through the trouble to create the GT caliper. Just being curious here. |
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Replies(1 - 3)
| Steve |
Dec 30 2013, 10:22 PM
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#2
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914 Guru Group: Members Posts: 5,614 Joined: 14-June 03 From: Orange County, CA Member No.: 822 Region Association: Southern California
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It's not just the piston, the pads are also slightly bigger.
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| mr914 |
Dec 31 2013, 06:05 PM
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#3
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914 Hillbilly Group: Members Posts: 576 Joined: 11-January 03 From: Lincoln NE Member No.: 131 Region Association: None |
There is also a difference in the casting
The 4s have a couple of extra ribs |
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| Eric_Shea |
Dec 31 2013, 06:15 PM
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#4
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PMB Performance Group: Admin Posts: 19,278 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains  |
Piston - You would need 2.5mm off the edge of the dust boot flange. There's just not enough meat there to make that happen.
Pad Width - Not only the cavity but the pin spacing would need to be expanded. All sorts of issues... (IMG:style_emoticons/default/sad.gif) |
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