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Author Topic:   Fuel pump cam for 460
Rustang
Gearhead

Posts: 188
From: Dubois PA
Registered: Nov 2000

posted 07-05-2001 06:00 PM     Click Here to See the Profile for Rustang   Click Here to Email Rustang     Edit/Delete Message   Reply w/Quote
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

posted 07-05-2001 08:54 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
NO! 460 and 429 385 series engines have there own style eccentrics.

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Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
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Rustang
Gearhead

Posts: 188
From: Dubois PA
Registered: Nov 2000

posted 07-05-2001 11:49 PM     Click Here to See the Profile for Rustang   Click Here to Email Rustang     Edit/Delete Message   Reply w/Quote
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

posted 07-09-2001 08:41 AM     Click Here to See the Profile for jkilroy   Click Here to Email jkilroy     Edit/Delete Message   Reply w/Quote
If I am not mistaken early pre 72 motors had a one piece pump cam. Those after that had two piece cams.

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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

posted 07-09-2001 03:43 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Jay is correct and also the thickness is different. About .100 or so.

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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

posted 07-10-2001 11:34 AM     Click Here to See the Profile for Ryan Wilke   Click Here to Email Ryan Wilke     Edit/Delete Message   Reply w/Quote
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?

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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

posted 07-10-2001 03:00 PM     Click Here to See the Profile for jkilroy   Click Here to Email jkilroy     Edit/Delete Message   Reply w/Quote
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.

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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

posted 07-11-2001 01:24 PM     Click Here to See the Profile for 65_302   Click Here to Email 65_302     Edit/Delete Message   Reply w/Quote
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

posted 07-12-2001 05:18 PM     Click Here to See the Profile for Ryan Wilke   Click Here to Email Ryan Wilke     Edit/Delete Message   Reply w/Quote
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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