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Author Topic: Is the 8v an 'interference' design?  (Read 2488 times)

Offline jezza16v

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Is the 8v an 'interference' design?
« on: 13 March 2009, 14:35 »
Hi all, I'm hoping to pick up a 1990 8v this weekend, its got 'fsh' but no record anywhere of a cambelt change. Its done 110k so I'm a bit worried about driving it home. I've only had 16v before and I know they smash the valves if the belt breaks, if the 8v does not, I'll take a chance and drive it, otherwise I need to sort out a trailer.  :undecided:
Thanks in advance, J.
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Offline Wayne

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Re: Is the 8v an 'interference' design?
« Reply #1 on: 13 March 2009, 15:39 »
Yes if the belt breaks you could or will damage valves
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Offline rubjonny

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Re: Is the 8v an 'interference' design?
« Reply #2 on: 13 March 2009, 15:59 »
unles modified no, its only 16v that is interferance
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Offline jezza16v

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Re: Is the 8v an 'interference' design?
« Reply #3 on: 13 March 2009, 16:23 »
Thanks RJ, bog standard 1 owner for 18 years from new.......I'll risk it then and RAC can pick me up if it breaks. I'm probably worrying too much but I bought a renault 11 a long while back & belt snapped on the long journey home & wrecked the head...ouch!
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Offline Wayne

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Re: Is the 8v an 'interference' design?
« Reply #4 on: 13 March 2009, 16:28 »
If the revs are high enough and the belt breaks it will bend valves, I have seen it happen when I use to work on them.

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Offline rubjonny

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Re: Is the 8v an 'interference' design?
« Reply #5 on: 13 March 2009, 17:09 »
i guess if enough death is been given its a risk, alsdo high lift cams will increase the risk. if sedate driving and all std head the risk is minimal.
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Offline twistedblack69

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Re: Is the 8v an 'interference' design?
« Reply #6 on: 13 March 2009, 17:39 »
Yea Ive got a high lift cam on mine (came with it, not thru choice) and the cambelt went the day after I bought it, wrecked half the valves. Was not happy, that was doing 70 on the motorway
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Offline Chris-White

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Re: Is the 8v an 'interference' design?
« Reply #7 on: 13 March 2009, 18:19 »
over 4.5k seems to be a bit more risky according to internet lands.
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Offline mattneck(Beavis)

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Re: Is the 8v an 'interference' design?
« Reply #8 on: 13 March 2009, 18:42 »
Quote from: Chris-White on 13 March 2009, 18:19
over 4.5k seems to be a bit more risky according to internet lands.

www.internetissh!t.org
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Sharpo says: (16:57:39)
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Offline jezza16v

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Re: Is the 8v an 'interference' design?
« Reply #9 on: 13 March 2009, 18:58 »
OK, now I'm really confused........Either the pistons can hit the valves when they're fully open or not (with the belt snapped that is)? I don't see why the revs would make a difference, surely its the mechanical geometry that dictates..? Or am I missing something?  :undecided:
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