[DeTomaso] The 351C Fuel Pump Chronicles

[Tomas Gunnarsson]

What's a CV 5 valve?

Tomas

----- Original Message ----- 
From: "Charles Engles" <cengles at cox.net>
To: "'De Tomaso List'" <detomaso at poca.com>
Sent: Saturday, December 20, 2014 8:24 PM
Subject: [DeTomaso] The 351C Fuel Pump Chronicles


Dear Forum,

 

 

                           As I have mentioned, the supply of high performance mechanical fuel pumps for the Cleveland from Holley and Edelbrock has dried up.

 

                           A recent dyno test showed that my nearly new Holley pump was anemic.   I sent it to John Christian for a fix.   JC decided to ever so slightly re-engineer it.

 

                         He removed the  lower part of the pump; made an adapter ring that permitted bolting a CV 5 valve body to the Holley main.   This modification does nothing for the absolute volume of each pump action, but it does increase the efficiency of each stroke.       It pumps one gallon at 2 psi in 38 seconds.  That is enough fuel to support approx 1100 hp.   The flow would be slightly less at higher pressures.

 

                          I am not running 1000 hp engines, but I might need another hipo fuel pump for another engine.   If you have a dead or unwanted Holley hipo fuel pump, then I would be keen to have it.

 

 

                                        Warmest regards,  Chuck Engles

 

PS: also looking for unwanted dead Pantera tachometers……..

                            

 

 

 Dear Dr. Engles, Yes there are a couple new parts involved. The adapter ring allows me to marry the CV 5-vavle body to the Holley main. This mod does nothing for the absolute volume of each pump action - instead it increases the efficiency of each stroke. I did not test the pump as received - someday I will take a 'stock' Holley pump (if I ever get another one from somebody) and run it on the engine like in the pictures. What I *CAN* tell you is that I ran the pump to verify that  A: there were no leaks and B: it pumped a reasonable volume. I ran the engine at 3000 rpm and measured the flow at ~2 psi. I did it twice to make sure I didn't get a false indication the first time. 

$$$$$$$$  I think you should be reimbursed for the work.   New parts, machining, not only "fixed", but improved.  Let me know.





Basically it pumps one gallon (at 2 psi) in 38 seconds. That is enough fuel to support ~1100 Hp. I suspect the flow will be slightly less at higher pressures. I also ran the pump 'dead headed' and it was right at 7 psi. 

$$$$$$$$  Well, that should be adequate.





I encourage you  to share this story with your Pantera brethren. As you know - it drives me crazy to see good hardware just put on a shelf or discarded when all it needs is a little good sense engineering. 

$$$$$$$$$   How much do you want me to share?   Do you want to be spotlighted as the guy to rebuild and improve the old Holley 351C fuel pumps?    I can keep it very low key or with full details.

 

J.C. (I have another with ball bearings in the pump arm pivot and a fitting in the atmospheric pressure port so I can use it on 'boosted' engines) I think I had sent you pictures 

$$$$$$$    I tumbled onto the ball bearings in the fuel pump eccentric  trick part that *you* came up with decades ago.  I don't think I have seen a picture of the pump you describe above.    






                     Warmest regards,  Chuck Engles






___________________________________

 

From: Charles Engles <cengles at cox.net> 

To: 'John Christian' <uniquengines at sbcglobal.net> 

Sent: Thursday, December 18, 2014 8:18 PM 

Subject: The Fuel Pump 

 

Dear JC, 

  

  

                        I went over the pictorial story during dinner.   Wow.  

  

1)        Scenes from PRI-South Lyon have remarkable similarity to PRI-Nichols Hills 

2)       You appear to have significantly modified  the Holley rather than just “fixed it”! 

  

  

                             Warmest regards, Chuck Engles 

 

 




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