5.4 DOHC or SOHC

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Feb 9, 2003 | 09:41 PM

CountryBoy685

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Joined: Mar 2002

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From: Grafton USA

5.4 DOHC or SOHC

Ok I know the 5.4 has a over-head cam.. but if it is a dual overhead cam does that mean that there are a total of 4 cams - 2 for each head- or just 2 cams -1 for each head-.. I am just curious and are the regular 16 valve engines or 32 valve engines.. just a crazy question that I was wondering.
Thanks for the patience w/ a newby to these motors
Andrew

2000 F-150 5.4

Feb 10, 2003 | 12:29 PM

DOHCmarauder

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From: Las Vegas

5.4 DOHC or SOHC

Quote:

Originally posted by CountryBoy685
Ok I know the 5.4 has a over-head cam.. but if it is a dual overhead cam does that mean that there are a total of 4 cams - 2 for each head- or just 2 cams -1 for each head-.. I am just curious and are the regular 16 valve engines or 32 valve engines.. just a crazy question that I was wondering.
Thanks for the patience w/ a newby to these motors
Andrew

2000 F-150 5.4

It's a fair question IMO. Think of a cylinder head as its own entity. Therfore if it's a DOHC every cylinder will have 2 cams. V engines having 2 heads would have four total cams and a W block would have 6 cams. (as a DOHC)

To confuse the issue the SOHC or DOHC setup really has little to do with valve numbers. Honda makes SOHC 4 valve motors and there have been DOHC with 2 valves per cylinder. Basically on a DOHC motor one cam operates the intake and one cam operates the exhaust weather it be 1 or 2 valves per cylinder.

However, in Ford's current line up, all DOHC engines(Cobra, Marauder, Aviator, Navigator, Lincoln LS a few V-6's) are 4 valve heads. All current SOHC motors are 2 valve with a 3 valve coming soon.

Last edited by DOHCmarauder; Feb 10, 2003 at 12:32 PM.