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Old 12-13-2006, 09:39 PM   #1
turbobuick33
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Default Whats an interference and non interference engine?

I was wondering whats an interference engine? And a non interference engine?

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Old 12-13-2006, 09:46 PM   #2
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Default Re: Whats an interference and non interference engine?

Interference engines: when the timing chain/belt breaks,the pistons WILL hit the valves and bend them.

Non-interference engines: when the timing chain/belt breaks,the pistons WILL NOT hit the valves and bend them.

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Old 12-13-2006, 09:49 PM   #3
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Default Re: Whats an interference and non interference engine?

The difference is replacing your engine when the timingchain/belt breaks.

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Old 12-13-2006, 10:14 PM   #4
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Default Re: Whats an interference and non interference engine?

Quote:
Originally Posted by turbobuick33 View Post
I was wondering whats an interference engine? And a non interference engine?

An Interference engine is a type of internal combustion engine where in the event of a serious valve train failure, or a 180 degree timing error, could lead the valves and pistons to strike each other. The most common cause of this a broken timing belt, but a catastrophic timing chain failure can also bring about this situation.

The reason for this is that for an engine to work properly, the actions of the pistons and valves must be precisely harmonized. This is accomplished in three ways. In racing engines, gears may connect the camshaft and crankshaft. In street engines, that task is accomplished by a timing chain or belt. When the chain or belt is installed, the camshaft and crank must be turned so that the number one cylinder is at Top Dead Center, or when it is at the maximum of its stroke. Generally, there are timing marks on the timing gears. or pulleys to aid in this, and the gears themselves are usually keyed to prevent misalignment. However, some people do screw it up.

If the belt or chain breaks, then this relationship is destroyed, and the valves and pistons move independently. In most automobile engines, this does no serious damage. The motor simply stops running until the belt/chain is replaced and the engine retimed. Even when the valves and pistons are at full extension, a small gap remains between them. We call this a non-interference engine. But such designs are not ubiquitous, and designers seeking a small combustion chamber may produce an interference design.


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Old 12-13-2006, 10:52 PM   #5
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Default Re: Whats an interference and non interference engine?

Hmm, how many different ways can we say this?

I like 10W30's answer the Best

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Old 12-14-2006, 12:39 AM   #6
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Default Re: Whats an interference and non interference engine?

Quote:
Originally Posted by Low Saturn View Post
In racing engines, gears may connect the camshaft and crankshaft. In street engines, that task is accomplished by a timing chain or belt.
I guess that makes the 2.5L Iron Duke in my friend Kelly's old money-pit Citation a "racing engine" .

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Old 12-14-2006, 07:49 PM   #7
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Default Re: Whats an interference and non interference engine?

Quote:
Originally Posted by madpogue View Post
I guess that makes the 2.5L Iron Duke in my friend Kelly's old money-pit Citation a "racing engine" .
Or my friends old 73 Mercury Capri (2.6L) & my old 78 Mustang II (2.8L) "racing engines".
My friends 73 Capri did run 12.79 in a 1/4 mile so I cant get too sarcastic with this quote

the answers to the topic are in post 2,3,&4
post #2 good explanation
post #3 straight to the point
post #4 detailed explanation

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Last edited by mkuz13; 12-14-2006 at 07:54 PM.. Reason: dinner time

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Old 12-14-2006, 08:14 PM   #8
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Default Re: Whats an interference and non interference engine?

Is the Saturn DOHC engine interference or non?

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Old 12-14-2006, 08:17 PM   #9
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Default Re: Whats an interference and non interference engine?

Quote:
Originally Posted by acman View Post
Is the Saturn DOHC engine interference or non?
ALL Saturn S-Series engines from '91 to '02 are interference engines. Both single and twin cam.

Valve crushing goodness!

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Old 12-14-2006, 08:28 PM   #10
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Default Re: Whats an interference and non interference engine?

What engines would be non interference?

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Old 12-14-2006, 08:55 PM   #11
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Default Re: Whats an interference and non interference engine?

Quote:
Originally Posted by turbobuick33 View Post
What engines would be non interference?
Luckily for me a Chrysler 2.2L engine is non-interferance. At least the 80's version.

Mine skipped a tooth on the timing belt. One year after the guy that did the head gasket told me the timing belt was fine, and didn't need to be replaced at that time, even though the engine was sitting on his bench in pieces when I suggested it. And I drove it for like 5 months out of that year.

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Old 12-14-2006, 09:05 PM   #12
mkuz13
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Default Re: Whats an interference and non interference engine?

Quote:
Originally Posted by turbobuick33 View Post
What engines would be non interference?
86-01 Ford Escort 1.9L SOHC
Most stock over-head valve V-6 & V-8
Ford 2.3L & 2.5L SOHC

Just a few off of the top of my head

Do you have an spacific engine that you are asking about?

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Old 12-15-2006, 12:25 AM   #13
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Default Re: Whats an interference and non interference engine?

Quote:
Originally Posted by mkuz13 View Post
86-01 Ford Escort 1.9L SOHC
Most stock over-head valve V-6 & V-8
Ford 2.3L & 2.5L SOHC

Just a few off of the top of my head

Do you have an spacific engine that you are asking about?
I was just curious..thats all

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