MP4 refers to "interference" engines that is...

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`lag

the pistons and valves don't clear each other, so if the belt were to snap well yeah, they'd maybe totally destroy the engine. ButI know nothing about Porsches. ** Edited by `lag at 5/13/2026, 12:10:17 PM

Posted: 05/13/2026 at 12:09 PM ET

(In response to this post by Brown Water)

Thread Replies (10)

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Timing belt; age or mileage? My Porsche 944 had it's timing belt replaced -- Galenahokie May 13, 2026 at 10:53 AM ET

Galenahokie • 05/13/26 10:53 AM ET

I wouldn't think it would be a problem... -- `lag May 13, 2026 at 12:15 PM ET

`lag • 05/13/26 12:15 PM ET

Looks pretty good from here. -- PhotoHokieNC May 13, 2026 at 04:15 PM ET

PhotoHokieNC • 05/13/26 04:15 PM ET

If you're curious, have a shop check its condition to see if there's any... -- EDGEMAN May 13, 2026 at 11:20 AM ET

EDGEMAN • 05/13/26 11:20 AM ET

By the time they get the belt covers off, it's not that much more labor to -- Galenahokie May 14, 2026 at 09:53 AM ET

Galenahokie • 05/14/26 09:53 AM ET

That was going to be my advice, too. -- MP4VT2004 May 13, 2026 at 11:34 AM ET

MP4VT2004 • 05/13/26 11:34 AM ET

It is most definitely an interference engine.** -- Galenahokie May 14, 2026 at 09:55 AM ET

Galenahokie • 05/14/26 09:55 AM ET

What's the worst that can happen, it snaps and he needs a new engine?** -- Brown Water May 13, 2026 at 11:23 AM ET

Brown Water • 05/13/26 11:23 AM ET

MP4 refers to "interference" engines that is... ◄ -- `lag May 13, 2026 at 12:09 PM ET

`lag • 05/13/26 12:09 PM ET

Well... -- EDGEMAN May 13, 2026 at 11:32 AM ET

EDGEMAN • 05/13/26 11:32 AM ET

I'd wager mileage is the bigger factor. Unless the belt is 30 years old.** -- Brown Water May 13, 2026 at 11:13 AM ET

Brown Water • 05/13/26 11:13 AM ET