7.3s interference or non-interference engines?
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Posting Guru
Joined: Feb 2008
Posts: 1,795
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From: Lubbock, Texas
interference engine= if your timing is off or if you have a failure of the timing system (throw a timing chain, belt, or for the 7.3s-gears) the valves/pistons will contact (or interfere)
and vice versa for non-interference motors
and vice versa for non-interference motors
Hotshot
Joined: Jul 2003
Posts: 12,177
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From: Newport, WA
Photo:
On edit- the photo appears to be an IDI 7.3 but same deal on the Stroker.
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Posting Guru
Joined: Feb 2008
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From: Lubbock, Texas
no but extra points for the sweet pic! (guess who has a new PC background)
the system used the time the motor (chain, belt, gears, etc) doesn't effect interference/non-interference setup of the motor
I think they are interference motors though.....
the system used the time the motor (chain, belt, gears, etc) doesn't effect interference/non-interference setup of the motor
I think they are interference motors though.....
Mountain Pass
Joined: Dec 2005
Posts: 137
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as far as I know, all diesel engines are interference engines. Beacause of the high compression ratio, there just isn't enough space for a valve to be open when the piston is at or near TDC.
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Fleet Mechanic
Joined: Aug 2007
Posts: 1,508
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From: The boonies by Dallas OR
Big time interference.
At TDC the piston is only .020" from the head. There's just no way to not be interference with that kind of compression.
Baring a bonehead assembler, there's no way for that to be an issue. As posted above, the cam drive is gear based.
At TDC the piston is only .020" from the head. There's just no way to not be interference with that kind of compression.
Baring a bonehead assembler, there's no way for that to be an issue. As posted above, the cam drive is gear based.
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Posting Guru
Joined: Feb 2008
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From: Lubbock, Texas
dang!!! those are some super tolerances!!!
Also yea being gear driven it would be difficult to suffer a failure of the system but I was mainly wondering just to know...no real reason
Lead Driver
Joined: May 2007
Posts: 8,608
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From: Belair md
definatly interference. and the reason for the tight clearance is because unlike your gas engine with a combustion chamber in the head, a 7.3 has no chamber, the cylinder head is perfectly flat across. the combustion chamber is part of the piston
Postmaster
Joined: Nov 2006
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From: somerset KY
so are you knocking gas engines? just remember the grand daddy of our beloved powerstroke is supposed to be the old 444 loadstar gas engine.