[DeTomaso] distributor gear

[Thomas Tornblom]

2012-04-13 13:41, Mikael skrev:
> With all the detailed input, my head is spinning. My conclusion for myself
> is that since I have a cam of unknown origin, I would be a very brave man to
> use anything else than bronze and cruise around Europe this summer. I'm not
> that brave. I'll bring an extra bronze gear though.
>
> It still puzzles me why this is a problem for the aftermarket, when
> apparently the factories has it sorted, never heard of this issue for a
> stock cam/gear.

It is only a problem for some of the aftermarket.

I have a Crane steel hydraulic roller cam, with a Crane steel 
distributor gear, and when I swapped to distributorless ignition, and 
pulled the dist out, the gear looked perfect. I installed the cam 
position sensor instead of the distributor, using a new Crane gear, just 
because I was too lazy to pull the old one, and I had a new one laying 
around.

I would never accept having to replace the distributor gear regularly. 
That might be fine on a race engine, but never on a street car.

And then there's all that bronze crap moving around in your engine. No 
thanks.

Thomas

>
> Thanks for input
>
> Mikael
> -----Oprindelig meddelelse-----
> Fra: JDeRyke at aol.com [mailto:JDeRyke at aol.com]
> Sendt: 13. april 2012 10:05
> Til: will.kooiman at gmail.com; detomaso at realbig.com
> Emne: Re: [DeTomaso] distributor gear
>
> In a message dated 4/12/12 7:51:48 PM, will.kooiman at gmail.com writes:
>
>> This metallurgy discussion only applies to roller cams, right?
>> I've always assumed that I didn't have to worry about the dist gear
>> material with my flat tappet cam (CompCams).
>>
> I agree with Dan. Regardless of the cam being run, the only real 'safe'
> setup with a 351-C is to minimize the loads the oil pump applies to the cam
> gear and the one in its mesh on the bottom of the distributor shaft. The
> distributor load is trivial; its all pump load. And there are three failure
> points: the distributor gear pin, the oil pump driveshaft and finally the
> gear teeth themselves. The first two are simple to fix; there is no perfect
> fix (so
> far) for #3.
> To cloud the mix further, occasionally, an aftermarket cam of any kind will
> get its integral gear cut at the wrong pressure-angle; with such a cam, any
> gear may last only 5 miles. Yes- it's happened. My 2¢- J Deryke
>
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Real life:   Thomas Törnblom             Email:	   thomas at hax.se
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