Bob:
I was responding to this portion of the thread, in which Mike seems more
concerned with heat transfer more than the fashion image of a certain color
of the paint. Maybe I'm reading that wrong, but as different colors of
paint do not make a noticeable difference in caliper heat transfer, I was
comparing what I perceived to be Mike's issue/concern (heat transfer
affected by paint color) to something that would make a noticeable
difference (hence, my mention of aluminum calipers).
Date: Thu, 21 Feb 2002 12:47:35 -0500
From: "Mike Munson" <fasttrs@mindspring.com>
Subject: Re: Caliper Color
Is there one color that would give off more heat like a thin coat of flat
black? To help dissipate heat?
Mike Munson
Atlanta
At 10:08 AM 2/22/02 -0500, you wrote:
>On Fri, 22 Feb 2002, William Whitmoyer wrote:
>
> > I'm guessing here, as I'm not near any of my brake system books, but
> > unpainted calipers would seem to bleed off heat faster than painted
> > calipers (as long as they don't rust), but I'm not sure that is going to
> > make a difference in any fashion....big difference would be going from
> cast
> > iron to aluminum calipers, especially if you are able to use larger rotors
> > and calipers.
>
>This may all be true, but a bit off track from the initial question...
>
>The initial question was: what color should I paint the calipers?
>
>Aluminium was not being discussed.
>
I'm on the digest version, so I cut and paste emails rather than reply the
whole digest to everyone. Obviously, I cut a lot out of your message that
I thought did not pertain to my question, sorry if that offended you and I
should have been more clear. But, here, I'm really asking a question about
street car caliper temps (not race conditions) as I don't know the answer
to this one, just curious, say you are driving down a mountain or doing a
little minor sporty driving?
I do, however, understand your excellent point about under the harshest
conditions, I have to run 580-590 degree dry boiling point Motul 600 in my
track car (and ducting on a brake-intensive tracks like Mid-Ohio) with race
pads...I tried the Castrol LMA with Porterfield Street/Track pads early on
in my track exploits...boiled the fluid, the pads disintegrated into chunks
and trashed the rotors...so I can assume that my track car calipers attain
temperatures in excess of 311 degrees..that being established, that's why
I'm curious about street car caliper temperatures.
> > Doesn't 200 degrees seem low for estimated caliper temps?
>
>I would certainly hope not. If your dry boiling point for your DOT Castrol
>LMA is 311F (at least I think that's what it is), and I've _never_ had
>brake fade owing to brake fluid problems, it's safe to say the calipers
>never get that hot. I do represent the extremes when it comes to brake
>usage, owing to my racing activities.
>
>But my statement was:
>
> > But regarding temps. on the claipers themselves, they shouldn't get too
> > hot (unless there's a problem with the pistons sticking). I'm guessing
> > they stay under 200F except under the most harsh conditions.
>
>The keywords are "except under the most harsh conditions".
>
>Bottom line - don't go around testing your caliper temps. with your finger
>- you'll get burned. But the brakes run fairly cool except when you ride
>'em hard or you have a problem (like a sticky caliper).
>
>regards,
>rml
>------------------------------------------------------------------------------
>Bob Lang Room N42-140Q | This space for rent
>Consultant MIT unix-vms-help |
>Voice:617-253-7438 FAX: 617-258-9535 |
>------------------------------------------------------------------------------
William Whitmoyer
69 TR6
90 BMW iX
91 CRX Si
|