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Old 21st Jan 2009, 12:20   #1
wijcc
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How to tell a non-interference engine@

How can you tell if the engine in your car is an non-interference engine so if the cambelt snaps it will not damage the engine?
Thanks guys
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Old 21st Jan 2009, 12:25   #2
paradigm
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Can the pistons hit the valves if the valves are down and the piston up?

Yes - interference.
No - non interference.

Externally it would be impossible to tell. You'd either have to know or not.


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Old 21st Jan 2009, 12:29   #3
wijcc
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ok thanks, is there any online sources that can tell if the engine is a non-interference engine?
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Old 21st Jan 2009, 12:32   #4
Clarkey
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which engine and i'll tell you.

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Old 21st Jan 2009, 12:57   #5
wijcc
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1998 mitsubishi 1.6L (from carisma glxi)
1999 mazda 1.5L (from 323 lxi)

thanks
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Old 21st Jan 2009, 17:35   #6
Clarkey
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both of those are interference design.

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Old 21st Jan 2009, 18:21   #7
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Am I correct in thinking that non-interference engines therefore have less compression than equivalent engines that have interference?
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Old 21st Jan 2009, 18:28   #8
Clarkey
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that, or low lift cams.

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Old 21st Jan 2009, 19:22   #9
Dogbreath
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Originally Posted by Nebzor View Post
Am I correct in thinking that non-interference engines therefore have less compression than equivalent engines that have interference?
This is not always the case, but designing around this does tend to require compromises such as deeper piston cut-outs.
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Old 21st Jan 2009, 22:57   #10
ShakenNstirred
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Quote:
Originally Posted by wijcc View Post
How can you tell if the engine in your car is an non-interference engine so if the cambelt snaps it will not damage the engine?
Thanks guys
mine`s camchain

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Old 21st Jan 2009, 23:20   #11
Clarkey
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Originally Posted by ShakenNstirred View Post
mine`s camchain
which can still fail...

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Old 22nd Jan 2009, 05:17   #12
ShakenNstirred
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which can still fail...
true but a lot less likely, than a belt
your more likely to have a chain tensioner fail than the chain it self
you would have to be very unlucky to have a chain fail(thats why its service life can be over 200k)
or the life of the engine

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Old 22nd Jan 2009, 07:48   #13
amigafan2003
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Quote:
you would have to be very unlucky to have a chain fail(thats why its service life can be over 200k)
Tell that to 24v Cosworth owners :-)

To tell if your engine is interference, remove the cylinder head, put no.1. piston to tdc, place 2mm of plastacine on the top of the piston, place cylinder head back on and replace bolts but leave them 5mm from tight, get a spanner that fist camshaft pulley(s) and cut it in half (this is important) - now turn camshaft through 360 deg - stop immediately if the head seems to lift slightly or it suddenly gets harder to turn, lift cylinder head and see if there are any marks on the plastacine - yes - interference, no - not interference.

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Old 22nd Jan 2009, 08:07   #14
dalin80
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or have a look in autodata which will take 1/1000th of the time.

what if it was your mum that got attacked by a priest in a van?!
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Old 22nd Jan 2009, 22:06   #15
wijcc
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thanks guys
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Old 22nd Jan 2009, 22:09   #16
paradigm
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Quote:
Originally Posted by ShakenNstirred View Post
true but a lot less likely, than a belt
your more likely to have a chain tensioner fail than the chain it self
you would have to be very unlucky to have a chain fail(thats why its service life can be over 200k)
or the life of the engine
Tell that to DRZ, who had his fail on his BMW 525i.


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Old 22nd Jan 2009, 22:11   #17
Sone
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the nissan 1.5 engine in the Almera seems to have huge chain problems aswell
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Old 22nd Jan 2009, 22:52   #18
Lopéz
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or have a look in autodata which will take 1/1000th of the time.
This ^^


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Old 22nd Jan 2009, 23:09   #19
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Cut the cambelt then try and start it.

(nb. Don't do this)

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Old 22nd Jan 2009, 23:32   #20
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Quote:
Originally Posted by ShakenNstirred View Post
true but a lot less likely, than a belt
your more likely to have a chain tensioner fail than the chain it self
you would have to be very unlucky to have a chain fail(thats why its service life can be over 200k)
or the life of the engine
Not true, Escorts like to fail, the fools didn't use a siamesed chain.



You can try turning the camshaft by hand, with a piston at TDC when you have the belt off. Non interference engines tend to have 2 valves per cylinder too.


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Old 22nd Jan 2009, 23:32   #21
K.C. Leblanc
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It's probably a combination of pub talk and folklore. But I've assumed 8 valve engines are more likely to be non interference then 16 valve.

Does anyone know off the top of their head if the 2 litra 16v engine in my Chysler Neon is Non Interference.


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Old 22nd Jan 2009, 23:39   #22
mattyg
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I believe the 1.6 v-tech engine is not an interferance engine unless its in v-tech which then its very very much an interferance engine.

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