<div dir="ltr"><div class="gmail_default" style="font-size:small">I use stock TR rear brake shoes with my OEM datsun Z drums and had no cracking problem in two seasons of racing. But since I upgraded to the 7/8 inch bore rear wheel cylinders this year, I have a lot more rear brake and now see bluish spots around inside of the lining probably from overheating. Way more brake dust in the drums now.</div><div class="gmail_default" style="font-size:small"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jun 26, 2017 at 10:08 AM, Spitfire Racing via Fot <span dir="ltr"><<a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Depending on the friction coefficient of the brake shoe material and<br>
velocity/pressure there would be varied levels of heat generation. It<br>
appears heat is the causative failure component. Testing would be the only<br>
accurate way to tell. I no longer have access to the engineering labs at<br>
Cornell or we could get some numbers to compare using various compounds and<br>
speed simulations.<br>
<br>
Russ Moore<br>
Spitfire #49<br>
<span class=""><br>
-----Original Message-----<br>
From: Fot [mailto:<a href="mailto:fot-bounces@autox.team.net">fot-bounces@autox.<wbr>team.net</a>] On Behalf Of Mordy Dunst via<br>
Fot<br>
Sent: Monday, June 26, 2017 9:22 AM<br>
To: <a href="mailto:fot@autox.team.net">fot@autox.team.net</a><br>
Subject: Re: [Fot] knockoff Datsun brake drums<br>
<br>
</span><div><div class="h5">Would the brake shoe compound have an influence on the drum longevity?<br>
<br>
MDunst Headgasket.com <a href="tel:626.358.1616" value="+16263581616">626.358.1616</a><br>
Fax <a href="tel:626.628.3777" value="+16266283777">626.628.3777</a><br>
Triple R Munitions, Inc <a href="tel:626.201.9471" value="+16262019471">626.201.9471</a><br>
T FFL 6,7 SOT 2<br>
<br>
On Monday, June 26, 2017, Yellow04 via Fot <<a href="mailto:fot@autox.team.net">fot@autox.team.net</a>> wrote:<br>
<br>
My take-away is the Centric aftermarket drums are not up to the task on my<br>
car. I have yet to weigh my TR250, but I'm confident despite best efforts<br>
the car is not a lightweight. Neither is the driver! While the aftermarket<br>
drums are working for some, I'm not going down that road again.<br>
<br>
I appreciate everybody's comments, and hope everybody continues to look<br>
closely at their drums (especially the aftermarket ones) while going through<br>
their pre-race rituals!<br>
<br>
Cheers<br>
<br>
Henry Frye<br>
<br>
> -----Original Message-----<br>
> From: Greg Solow<br>
> Subject: knockoff Datsun brake drums<br>
><br>
> I believe that the drums that The Z store sells are "Centric" Brand.<br>
> We use many of their products in out shop and find that they are<br>
> excellent quality. I am currently using a pair of their drums on the<br>
> rear of my Morgan. I have scoops with cooling duct leading into the<br>
> backing plates and additional exit ventilation holes in the backing<br>
> plates. So far I have had no problems with serious cracks int he drum<br>
liners.<br>
><br>
><br>
<br>
<br>
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