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Author
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Topic: Fuel pump cam for 460
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Rustang
Gearhead Posts: 188
From: Dubois PA
Registered: Nov 2000
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posted 07-05-2001 06:00 PM
   
I need a fuel pump cam to get my 460 completed. (The bottom end was from a fuelie motor, so it didn't have the eccentric in it.) Will one from a 351C or a 351W work?
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Moneymaker
Administrator Posts: 11493
From: Lyons, IL, USA
Registered: May 99
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posted 07-05-2001 08:54 PM
NO! 460 and 429 385 series engines have there own style eccentrics.  ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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Rustang
Gearhead Posts: 188
From: Dubois PA
Registered: Nov 2000
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posted 07-05-2001 11:49 PM
Alex, what is the difference? A buddy of mine rooted around and found an eccentric he thought was from a 460. It is solid, unlike the two-piece ones I have laying around. But other than that it looks dimensionally the same. I think I'll wait until I pull my old motor and just use that eccentric. Thanks again------------------
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jkilroy
Gearhead Posts: 1289
From: Austin, TX
Registered: Dec 99
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posted 07-09-2001 08:41 AM
If I am not mistaken early pre 72 motors had a one piece pump cam. Those after that had two piece cams.------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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Moneymaker
Administrator Posts: 11493
From: Lyons, IL, USA
Registered: May 99
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posted 07-09-2001 03:43 PM
Jay is correct and also the thickness is different. About .100 or so. ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link [This message has been edited by Moneymaker (edited 07-09-2001).]
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Ryan Wilke
Gearhead Posts: 607
From: Stanton, Michigan
Registered: Oct 2000
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posted 07-10-2001 11:34 AM
Question for you Motor Guru's -
If an electrice fuel pump is used, then the mech. pump cam eccentric isn't needed...but would NOT installing it cause any un-balance in the cam and causing unnecessary harmonics in the timing & valvetrain?
..... I'm thinking that cam manufacturers may balance the cams via 'externally-balanced' assuming the fuel pump cam will be installed on the cam end? ------------------
The '3-Pedal Attitude' Kid
in a '69 FB w/ 306 now, but
the 460+ is coming... :D
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jkilroy
Gearhead Posts: 1289
From: Austin, TX
Registered: Dec 99
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posted 07-10-2001 03:00 PM
That is an interesting question. First, I don't believe that camshafts themselves are ever balanced. Furthermore I don't know that it would even matter give that the lifter, pushrods, rockers, valves, and the rest of the valvetrain are not. Also, the cam runs at half motor speed so even when you are buzzing down the track, shifting at 7000, your cam is "only" hitting 3500.Now there are other issues to consider. First is that the thickness of the part would have to be considered, since it would not be there. Is the part used in containing any other stuff? That kind of thing. ------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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65_302
Journeyman Posts: 45
From: Bixby, OK
Registered: Jul 2001
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posted 07-11-2001 01:24 PM
It may not apply here, but we just swapped in a new 302 crate motor and it came w/o an eccentric. Ford Motor Racing told us we could put a late model eccentric (2 piece) on it or switch to electric, it did not matter that the eccentric is missing. We opted for the electric because we MAY switch to injection later on.
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Ryan Wilke
Gearhead Posts: 607
From: Stanton, Michigan
Registered: Oct 2000
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posted 07-12-2001 05:18 PM
Jay,
I forgot about the 1/2 rpm bit,,, which I'm sure makes balance less of an issue.Regarding the valvetrain side-loading on the cam; it seems to me that the masses are much less with typical valvetrain components than the total mass associated with a connecting rod, pin, piston & rings. I suppose the timing chain located on one end throws an enormous amount of "bounce" into the cam (considering that, it's a wonder more of them don't break :eek bringing us back to the question if the fuel pump eccentric effects cam 'balance'; -- I'd say considering the chain drive, varying tension in the life of valve springs, etc. that it probably doesn't make a noticable difference.
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