AP Racing 2-pot caliper images - Page 2 - LotusTalk - The Lotus Cars Community
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post #21 of 32 (permalink) Old 01-13-2017, 09:47 AM Thread Starter
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OK, ok - enough discussion about piston size.

In case anyone needs replacement bleed screws, these pieces from Pegasus Racing (P/N 3266-03) fit just fine. They're M10x1.0, 1.25" long. I'm replacing mine because the sacrificial zinc coating had corroded away, exposing the carbon steel beneath.


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post #22 of 32 (permalink) Old 01-13-2017, 09:59 AM
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Would you be so kind to explain to us all why the only dimension on that drawing in "inches" is the piston diameter if that was not the piston diameter?
From the drawing
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1.75" ( Ø44.45mm)BORE REF.
"BORE REF" refers to the Bore diameter naming convention, as @exigegus and @Formulabob mentioned, and also the O-ring size. O-rings are not sized to be exactly the same diameter as the piston... or else they wouldn't work. The AP O-ring part document http://www.apracing.com/drawings/cp4...Temp%20SIB.pdf lists parts in " and mm, since the O-ring suppliers have specified them this way. If the Bore were exactly 44.45 mm [1.75"], then the piston could not be 44.5 mm as AP specifies. It's a naming convention that AP apparently specifies these particular pistons as 44.5 mm, the bores as 44.45 mm [1.75"], the o-rings as 1.75" and the calipers as 2x 1.75" Radial Mount

You were jumping on the OP and being pedantic. My intention was to show you how pedantic you were being.

Most people are able to figure out that if they measure a piston at 44.41mm and the closest thing the manufacturer offers is a 44.5mm... Then that's what they'll order...

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post #23 of 32 (permalink) Old 01-13-2017, 10:14 AM
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Originally Posted by Vulcan Grey View Post
From the drawing


"BORE REF" refers to the Bore diameter naming convention, as @exigegus and @Formulabob mentioned, and also the O-ring size. O-rings are not sized to be exactly the same diameter as the piston... or else they wouldn't work. The AP O-ring part document http://www.apracing.com/drawings/cp4...Temp%20SIB.pdf lists parts in " and mm, since the O-ring suppliers have specified them this way. If the Bore were exactly 44.45 mm [1.75"], then the piston could not be 44.5 mm as AP specifies. It's a naming convention that AP apparently specifies these particular pistons as 44.5 mm, the bores as 44.45 mm [1.75"], the o-rings as 1.75" and the calipers as 2x 1.75" Radial Mount

You were jumping on the OP and being pedantic. My intention was to show you how pedantic you were being.

Most people are able to figure out that if they measure a piston at 44.41mm and the closest thing the manufacturer offers is a 44.5mm... Then that's what they'll order...
Nope...wrong again. It is NOT a naming convention, it is the nominal design size.

Whoever said that island life is great was never committed to Alcatraz...
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post #24 of 32 (permalink) Old 01-13-2017, 10:18 AM
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Compliments of your AZ counterpart, Mr. Zust:
Do you have those installed on your car? Have you had them in long enough to have had to change your brake pads yet? It would be very interesting to see the back of the brake pad after some use...

Whoever said that island life is great was never committed to Alcatraz...
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post #25 of 32 (permalink) Old 01-13-2017, 11:46 AM
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Do you have those installed on your car? Have you had them in long enough to have had to change your brake pads yet? It would be very interesting to see the back of the brake pad after some use...
We've been using these pistons for years in some pretty intense braking. Not sure how many sets we've sold over the years. It's easily triple digits. Whatever implication you're attempting to make is unfounded, JJ.

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post #26 of 32 (permalink) Old 01-13-2017, 11:58 AM
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.., JJ.

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post #27 of 32 (permalink) Old 01-13-2017, 02:53 PM
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Whatever implication you're attempting to make is unfounded, JJ.

Phil
I thought the same thing when MGK came on the scene but I am just not sure. Can the mods check ip addresses? Not definitive as ip's are easy to cover up.

On the subject of BOE's SS pistons, I have been running them for a few years and they have been fine.
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post #28 of 32 (permalink) Old 01-13-2017, 03:21 PM
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I thought the same thing when MGK came on the scene but I am just not sure. Can the mods check ip addresses? Not definitive as ip's are easy to cover up.

On the subject of BOE's SS pistons, I have been running them for a few years and they have been fine.
Way ahead of you there.

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post #29 of 32 (permalink) Old 01-13-2017, 08:14 PM
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Oops…it looks like I stepped on somebody’s toes or sore spot by accident. Or there’s some history going on here. Photos aren’t allowed to be requested here? Did I miss something in the regs?

Whoever said that island life is great was never committed to Alcatraz...
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post #30 of 32 (permalink) Old 01-22-2017, 02:14 PM Thread Starter
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Photos aren’t allowed to be requested here?
Haven't used these pistons before - no feedback yet.

Brakes are painted, reassembled and system bleeding underway:


I used VHT caliper paint... which even after baking at 200 F per the instructions doesn't seem to have adhered to the AP racing anodize finish very well. I had a few scars on the calipers from wheels weights hitting due to poor placement on 15" wheel barrels. The scars and file clean up work meant anodize was missing in some areas, which necessitated a new finish, i.e., paint. We'll see how it holds up.

Yes, the original brake lines are still in place. After reading about the install hassle - I opted to wait until the next time I have the front clam removed.

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post #31 of 32 (permalink) Old 01-22-2017, 02:29 PM
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I think the calipers look good. VHT is a decent product.

The problem I have with some caliper paint kits is that usually the calipers look like someone took a bad paintbrush to them.

San

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post #32 of 32 (permalink) Old 11-21-2018, 12:24 AM
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Hi, someone can tell me the length of the piston? Tks.
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