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Thread: Timing chain failure on the Dodge Challenger Reply to Thread
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  Topic Review (Newest First)
04-17-2015 11:01 AM
outflyin
Quote:
Originally Posted by 440_Magnum View Post
Metal-on-metal timing gears are pretty noisy. Think "almost as loud as a blower drive belt" noisy. The ones that were commonly used in truck 6-cylinder engines back in the 60s and 70s had a phenolic cam gear to make them quieter... but now you have a cam gear that can strip teeth just like a plastic-toothed timing chain gear.
Simple solution to the gear noise problem: LOUD exhaust!
04-17-2015 10:40 AM
19johned53 There was a few year period that A5 owners wished there was a belt, or anything else than what the factory had engineered and installed! LOL


Thankfully, the "fix" seems to be working well, as no reported failures with the new shoe and tensioner.
04-17-2015 10:12 AM
Slidd Friend had the belt in her 85 Charger. As the miles neared 80,000, I started thinking about changing it. Dammit too late, it let go a month later at almost exactly 80,000 miles. Luckily no damage or bent valves.


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04-17-2015 10:08 AM
SoCalChallengerLover
Quote:
Originally Posted by 440_Magnum View Post
Like... EVERY SINGLE HONDA with a timing belt.

Interference design engines can have higher compression, more favorable valve angles, and more efficient valve timing, so that's why the manufacturers did it. That's also why I like chains, even though they're not perfect.
I hear you , but to risk a engine failure for a little performance is crazy IMOP.
A lot of the Japanese cars are interference motors.

Also you never know when a belt will snap.

I had a 1984 FORD EXP 2 seater (remember those?) and my belt snapped at about 50,000 miles while judt cruising down the road,and the manual said to change it at 60,000......good thing it wasn't an interference motor.
04-17-2015 09:33 AM
randycat99 I'd almost say I'd take the noise over the alternative. No need for it to have to be a straight-cut gear set either, right? I'd think in this day and age it would be possible to come up with quiet(er) gear drive, when the survival of an interference design engine is on the line...
04-17-2015 09:23 AM
440_Magnum
Quote:
Originally Posted by randycat99 View Post
On an ohv design, I wonder why they don't go back to a gear to gear drive, if it's going to be an interference design...
Metal-on-metal timing gears are pretty noisy. Think "almost as loud as a blower drive belt" noisy. The ones that were commonly used in truck 6-cylinder engines back in the 60s and 70s had a phenolic cam gear to make them quieter... but now you have a cam gear that can strip teeth just like a plastic-toothed timing chain gear.
04-17-2015 09:20 AM
440_Magnum
Quote:
Originally Posted by SoCalChallengerLover View Post
One of the most idiotic designs EVER has to be a motor that will self destruct if a belt breaks!
Like... EVERY SINGLE HONDA with a timing belt.

The first generation (93-97) of the 3.5 was a non-interference design- belt breaks, you coast to the side of the road. Replace the belt, no harm done other than aggravation. It also was not prone to break, I knew a lot of people back then who went way beyond the recommended 90k mile belt change interval with no problem. The 2nd-gen 3.5 was an interference design so it can bend valves if the belt breaks, although I've only heard of a very few examples of it actually breaking. Yeah, I think its dumb, but most timing belt engines after the mid 90s were made that way.

Interference design engines can have higher compression, more favorable valve angles, and more efficient valve timing, so that's why the manufacturers did it. That's also why I like chains, even though they're not perfect.
04-17-2015 09:05 AM
randycat99 Given the context that made this discussion topic possible, chain designs can be just as vulnerable, it seems. The real issue is the "interference design" which is not uncommon in engines over many decades, and that typically comes about with high-output engines and high compression ratio designs. In an ohc design, you pretty much have to go with a belt or chain due to the proximity between crankshaft and camshafts. On an ohv design, I wonder why they don't go back to a gear to gear drive, if it's going to be an interference design...
04-17-2015 01:40 AM
SoCalChallengerLover
Quote:
Originally Posted by Slidd View Post

One of the most idiotic designs EVER has to be a motor that will self destruct if a belt breaks!
04-16-2015 06:32 AM
Harleylay Well good news is I just called dealership and timing chain recall was done last September
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