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Old 07-22-2008, 06:09 AM   #1 (permalink)
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Default Question - may be stupid = are our engines 2.4 - Interference engines?

Question - may be stupid - are our engines 2.4 = Interference engines?
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Old 07-22-2008, 06:16 AM   #2 (permalink)
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Quote:
The 2.4 Liter (148 cu. in.) in-line four cylinder engine is a double over head camshaft with hydraulic lash adjusters and four valve per cylinder design. The engine is free-wheeling; meaning it has provisions for piston-to-valve clearance. However valve-to-valve interference can occur, if camshafts are rotated independently.


So yes and no... it basically says the pistons won't hit valves, but the valves can hit each other.
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Old 07-22-2008, 06:18 AM   #3 (permalink)
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Well thank you
Yeah my friend had a laser, and the timing belt broke...bad news for him...
trashed his engine to say the least..
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Old 07-23-2008, 06:39 AM   #4 (permalink)
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Yes... no one EVER wants to pay for a timing belt...

that is until AFTER they pay for an engine.
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Old 07-23-2008, 07:12 AM   #5 (permalink)
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Quote: Originally Posted by thepowertowin View Post
Yes... no one EVER wants to pay for a timing belt...

that is until AFTER they pay for an engine.

good point....had a local who asked me what i thought he should do since he had 64k miles, i told him to replace the timing belt ASAP. He chose to ignore the advice and less than 15k miles later the belt had a few teeth eaten off by the sprockets. Fortunately for him though he wasnt driving it when it happened but for about the price of a new short block a local shop put him on the road again....with a new belt.
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Old 07-23-2008, 07:21 AM   #6 (permalink)
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It's funny... I can ALWAYS tell who has had their timing belt break. They'll call and ask how much to replace their timing belt, and when we can do it. And not complain about price at all. I remember some DOHC turbo stealths that had the same thing happen. Those were NOT cheap to fix by any stretch of the imagination. And yet, someone would think it was too expensive to replace the timing belt, and then more or less total their car w/ engine repair.
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Old 07-23-2008, 10:07 PM   #7 (permalink)
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I was under the impression, even with the possibility of the valves hitting, that it was very rare to have any damage done to the motor if the timing belt breaks.
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Old 07-23-2008, 10:17 PM   #8 (permalink)
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Quote: Originally Posted by 7055 View Post
I was under the impression, even with the possibility of the valves hitting, that it was very rare to have any damage done to the motor if the timing belt breaks.

If the belt breaks, then the cams cant rotate, thus not opening and closing the valves. So whichever valves are open when the chain goes, then they are FUBARd from collision with the pistons that are still moving. Also, whichever valves are closed are keeping air from flowing in and out of the motor.
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Old 07-23-2008, 10:43 PM   #9 (permalink)
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Quote: Originally Posted by West Palm SRT4 View Post
So whichever valves are open when the chain goes, then they are FUBARd from collision with the pistons that are still moving.

?? Pistons cannot contact valves.
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Old 07-24-2008, 07:07 AM   #10 (permalink)
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The problem would be more likely if someone had some teeth strip off which could allow it to move one cam and not the other for a short period.
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Old 09-16-2008, 05:17 PM   #11 (permalink)
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dont worry its not a stupied queston i was just wondering the same thing - im about to go to the junk yard and buy a 2.0 exhaust cam
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Old 09-16-2008, 07:56 PM   #12 (permalink)
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i broke my timing belt the other week and took out 8 valves they did contact the pistons. This is is 9.1:1 compression and bc stage 3's lucky for me i wasnt at the top of the power band it was around 5k rpm so pretty lucky
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Old 09-17-2008, 10:26 AM   #13 (permalink)
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so when does the Timing belt need to be repalced on the SRT-4? what do they recommened from the manufacture? i had a mitsubishi before my Srt, an i had do change it out at 60k miles.. I have 49k now on my 04..
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Old 09-17-2008, 11:20 PM   #14 (permalink)
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60K is pretty standard on all cars with belts. There are some with "special circumstances" that allow them to go longer (Mazda Miata has longer intervals depending on original state of sale). On 1st gen Neons it was also standard to replce the head gasket at the sametime.
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