DeTomaso Mailing List: December 2000, Message #238

From:	ZackZ6667@aol.com
Subject:	Re: Distributor roll pin
Date:	Wed, 6 Dec 2000 13:09:59 -0500


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Well, Jack, I'm gonna halfta differ with ya...
Any race engine builder or engineer (Jack?) knows that when you start 
stressing an engine (or any other machinery) beyond its originally intended 
purpose, the weakest link breaks. And all engines and machinery have a weak 
link. When you fix that weak link and stress the engine further, the next 
weakest link breaks. It could be that this (possibly designed in) weak link 
was under designed, similar to someone designing a fuse into a circuit with 
too low an amperage. The shear pin appears to be a relatively easy fix, but 
if it's fixed too well, and the oil pump drive shaft is not upgraded, you may 
end up twisting that. The point is, the entire system needs to be upgraded 
(wasn't this your point also Jack?). Personally, based on the info I have, I 
would want to upgrade the shear pin, but still keep it as the weakest link in 
the system.

As far as the Ford big-block small bypass hose on top of the water pump:
Another safety feature! Wow! Those Ford engineers are smart! :-)

Zack


In a message dated 12/6/00 10:38:15 AM Central Standard Time, JDeRyke writes:


> snip....<I've been thinkin' about it and realized that this shear pin might 
> be a designed in safety feature. If your oil pump seizes up something has 
> to give..... In fact, if the shear pin shears, then the distr. stops 
> turning and the engine stops. This does not cause a boom, but actually 
> saves the engine from running without oil pressure...>
> Thats Microsoft-think; take a flaw and call it a "feature" instead of 
> fixing it. In fact, it probably was simply because the roll pin is cheap & 
> usually works fine if you change your oil often & drive without revving the 
> engine very high. But if you're right, lets include the Ford big-block 
> "Safety Feature": the small bypass hose on top of the water pump- when it 
> blows, it sprays on the distributor, thus killing the ignition and saving 
> overheated-engine damage! Naw.... J DeRyke
> 



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<HTML>
<BR>Well, Jack, I'm gonna halfta differ with ya...
<BR>Any race engine builder or engineer (Jack?) knows that when you start 
stressing an engine (or any other machinery) beyond its originally intended 
purpose, the weakest link breaks. And all engines and machinery have a weak 
link. When you fix that weak link and stress the engine further, the next 
weakest link breaks. It could be that this (possibly designed in) weak link 
was under designed, similar to someone designing a fuse into a circuit with 
too low an amperage. The shear pin appears to be a relatively easy fix, but 
if it's fixed too well, and the oil pump drive shaft is not upgraded, you may 
end up twisting that. The point is, the entire system needs to be upgraded 
(wasn't this your point also Jack?). Personally, based on the info I have, I 
would want to upgrade the shear pin, but still keep it as the weakest link in 
the system.
<BR>
<BR>As far as the Ford big-block small bypass hose on top of the water pump:
<BR>Another safety feature! Wow! Those Ford engineers are smart! :-)
<BR>
<BR>Zack
<BR>
<BR>
<BR>In a message dated 12/6/00 10:38:15 AM Central Standard Time, JDeRyke writes:
<BR>
<BR>
<BR>snip....<I've been thinkin' about it and realized that this shear pin might 
be a designed in safety feature. If your oil pump seizes up something has 
to give..... In fact, if the shear pin shears, then the distr. stops 
turning and the engine stops. This does not cause a boom, but actually 
saves the engine from running without oil pressure...>
<BR>Thats Microsoft-think; take a flaw and call it a "feature" instead of 
fixing it. In fact, it probably was simply because the roll pin is cheap & 
usually works fine if you change your oil often & drive without revving the 
engine very high. But if you're right, lets include the Ford big-block 
"Safety Feature": the small bypass hose on top of the water pump- when it 
blows, it sprays on the distributor, thus killing the ignition and saving 
overheated-engine damage! Naw.... J DeRyke
<BR>
<BR>
<BR>

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