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Old 06-02-2005, 02:05 PM   #1
jarvisx2000
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Interference engine

I have seen several posts about people asking whether or not there engin is interference or not. I was just wondering what that means.
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Old 06-03-2005, 02:06 PM   #2
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The term refers to the valve train and whether or not the valves would hit the piston if they were in their most open position when the piston is at the top of its stroke. If they would hit the piston, then the engine is termed an interference engine.

With an interference engine, it is much more important to follow the maintenence procedure for the timing belt. If you do not and the timing belt breaks, the valves will stop in whatever position they are in (some open and some closed) but the pistons will keep moving because they are connected to the transmission and the momentum of the car will keep driving them. When the pistons reach TDC in the cylinders where the valves are stuck open....well, now your looking at replacing valves and perhaps pistons depending on how hard the hit is.

Normally you do not have to worry about that on a non-interference engine.

Hope this helps.
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Old 02-16-2006, 06:54 PM   #3
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it means how tite the pistons fit inside it
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Old 02-16-2006, 08:02 PM   #4
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so like if a piston fits really loose, like 1/2 on each side of the cylinder wall, then is it interference AUTOPRO?
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Old 02-16-2006, 10:20 PM   #5
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Originally Posted by carls47807
so like if a piston fits really loose, like 1/2 on each side of the cylinder wall, then is it interference AUTOPRO?
pistons cant be that loose the engine will run bad
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Old 02-16-2006, 10:29 PM   #6
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Quote:
Originally Posted by AutoPro
pistons cant be that loose the engine will run bad
Just proves you know nothing about cars...If you'd read the posts above, in an inteference engine, when the pistons are at TDC and the valves are fully open, and contact is made between the two, it's interference...

If the pistons did not fit perfectly against the walls, the combustion won't have much of an effect, and might stop the car from running...
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Old 02-16-2006, 10:35 PM   #7
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Wrong too. The valves aren't fully open at TDC. They are driven fully open at their centreline angles and with inertia fully open a little after that.

I like the loose piston fit explanation, tongue in cheek though it must be.
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Old 02-16-2006, 10:40 PM   #8
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Wrong too. The valves aren't fully open at TDC. They are driven fully open at their centreline angles and with inertia fully open a little after that.

I like the loose piston fit explanation, tongue in cheek though it must be.
Clean out your inbox lol
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Old 02-16-2006, 10:44 PM   #9
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Done.
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Old 02-16-2006, 10:52 PM   #10
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Quote:
Originally Posted by Wally
Wrong too. The valves aren't fully open at TDC. They are driven fully open at their centreline angles and with inertia fully open a little after that.


Actually, Wally, he's right. He's not talking about them contacting during normal operation when the valves move independantly of the pistons. He's saying that if, for example a cam drive breaks, and the valves are HELD fully open, the piston will hit them when the piston tries to reach TDC. In a non-interference engine, the piston can rotate through TDC with the valves fuly open and they will not contact them.

AutoPro, how long did you say you worked on cars, again? This is a basic question that an ASE certified mechanic shouldn't get wrong.
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Old 02-16-2006, 10:55 PM   #11
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nevermind you i bet you dont even know how to work on a car engine

i bet you drive a girly neon to girls car
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Old 02-16-2006, 10:56 PM   #12
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nevermind you i bet you dont even know how to work on a car engine

i bet you drive a girly neon to girls car

Nice comeback. So why was an SAE mechanic like youself wrong about what an interference engine is? It has nothing to do with how tight the piston is.
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Old 02-16-2006, 10:57 PM   #13
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nice girly car in your picture buddy
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Old 02-16-2006, 11:00 PM   #14
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nice girly car in your picture buddy

How is a traditional, collectable sports car a girly car?

Oh, wait, you've been proven wrong, and you have no intelligent comeback except continue to prove how ignorant and small brained you are. That car is merely the latest in a string of over a hundred cars I've owned and restored/built. I doubt you'd be able to work on ANY of it without being a complete f*ckup.
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Old 02-16-2006, 11:02 PM   #15
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i owned more cars than you and i never owned a girly car like that do you own a neon to
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