[DeTomaso] Fw: Re: Pantera fall down go boom :<(

[John Taphorn]

Chance

Great question!  I look forward to hearing opinions on the matter.  My 
observations regarding the geographic relationship of the two parts matched 
yours.  Since, I couldn't figure out how to drill the hole to enable the 
spray to hit the gear interface, I bailed on it.  I did however, debur and 
smooth the spill hole above the distributor gear with the impression that 
adequate oil would spill through that opening.  Drilling the plug looked 
like a dark art to me.

The oil spray through a .030" hole will depend on oil temperature and 
pressure.  I believe that you will get an idea by looking at how the oil 
sprays or dribbles from the oil hole of your aftermarket roller lifter where 
it feeds the trunion.  Many of them have .030" orifices.  The late Jerry 
Pentaleri made a set of .020" oil restrictors for a set of pushrods which I 
was at one time running with a solid lifter roller cam.  He had first fabbed 
a set at .030".  When I started the car with .030" restrictors and no valve 
covers to set the lash, Mobile 1 splashed the wall 10 feet from the car on 
the passenger's side.  HV pump with 75lb spring.  Then we went to .020".

Now, I am an advocate of the external oil line on a 351C!

JT
----- Original Message ----- 
From: "Chance Dorsey" <chance.dorsey at yahoo.com>
To: <JDeRyke at aol.com>; <davel at emspace.com>
Cc: <DeTomaso at realbig.com>
Sent: Friday, June 24, 2011 5:32 PM
Subject: Re: [DeTomaso]Fw: Re:  Pantera fall down go boom :<(


> Hi all,
>
> Can someone please explain this modification to me.  This week I FINALLY
> received a Rollmaster CS3130 for my 393C build.  So I'm at the point in 
> the
> assembly of the motor where I need to either make this modification or 
> pass
> on it and move on with the build.  However, looking at the layout of where
> this galley plug is in reference to where the distributor gear is has me
> wondering how this is supposed to work.  First take a look at this 
> picture:
>
> http://www.poca.com/index.php/gallery/?g2_itemId=32330
>
> Is the idea for the oil to "spray" at the gear?  If so, the oil plug 
> doesn't
> line up with the gear.  I understand that some of it may hit the shaft, 
> but
> only to be slung off by the spinning gear.  So is one supposed to drill 
> the
> hole at an angle in hopes of pointing the spray of oil in the right
> direction?  Has anyone tested a .030 hole with 50 - 70 PSI of oil pressure
> to see if it even "sprays".......OR is the oil just supposed to "dribble" 
> (I
> know such a strong word for some) down the block on the gear?  If so, what
> would this provide that the oil return hole just to the side of the gear
> doesn't?
>
> There's also the possibility that I'm completely in left field with my
> comprehension of this  (It wouldn't be the first time)  However, this is
> starting to sound like the "ole' oil return line" fix that has so famously
> followed the Cleveland around for years.  I'm not saying it's wrong.....I
> just don't understand it.
>
> Thanks,
>
> Chance
>
>
> ----- Original Message ----- 
> From: <JDeRyke at aol.com>
> To: <davel at emspace.com>
> Cc: <DeTomaso at realbig.com>
> Sent: Friday, June 24, 2011 3:23 PM
> Subject: Re: [DeTomaso] Fw: Re:  Pantera fall down go boom :<(
>
>
>> In a message dated 6/24/11 10:31:26 AM, davel at emspace.com writes:
>>
>>> My alternative is -.... a 5/8 x 1/2" UNF internal hex plug. I should be
>>> able to buy that in brass which would be drillable. Anyone know a reason
>>> not
>>> to use brass in that spot?
>>>
>>>
>> IMHO no problem with brass-   as long as the thread's the same and 
>> there's
>> enough material left in the internal hex drive to tighten the plug in so
>> the
>> plug goes in flush. Matter of fact, aluminum should work as well too. 
>> Both
>> would be much more drillable in the smaller sizes than harder steel. 
>> Going
>> too big in your spray hole simply floods the gear mesh area and might
>> reduce
>> the oil supply in that galley- which is a main lube channel for the vital
>> mains & rods. The bad effects might not show up until the revs are high
>> for a
>> long time. FWIW- J Deryke
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