Timing belts break, chain guides fail...

"Demon-Xanth knows how to operate a street." (demon-xanth) 02/08/2017 at 12:42 • Filed to: None

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The Corvair and MC12 don’t care!

For Sweden > Demon-Xanth knows how to operate a street. 02/08/2017 at 12:47

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Is the MC12 the spiritual successor of the Corvair?

RamblinRover Luxury-Yacht > Demon-Xanth knows how to operate a street. 02/08/2017 at 12:48

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Top pic: when gear whine is life.

Bottom pic: when being as stupid as the plastic cam gear on the Iron Duke isn’t in the cards... yet.

HammerheadFistpunch > Demon-Xanth knows how to operate a street. 02/08/2017 at 12:49

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Or the Toyota 1HZ

Demon-Xanth knows how to operate a street. > For Sweden 02/08/2017 at 12:50

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No, the MC12 tried to be as cool as the Corvair but failed in that it’s only a sportscar that lived in the shadow of the car it was based off of. Where the Corvair became an amphibious tank, a plane, a motorcycle, a van, a dual engined articulating off road vehicle...

TylerJ > Demon-Xanth knows how to operate a street. 02/08/2017 at 12:55

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But bearings are forever?

Die-Trying > Demon-Xanth knows how to operate a street. 02/08/2017 at 12:56

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smallblock chevy.........

bhtooefr > Demon-Xanth knows how to operate a street. 02/08/2017 at 12:59

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The Volkswagen V10 TDI also doesn’t care. And, accessory belts break, too, but the V10 TDI doesn’t care about that, either.

That Bastard Kurtis - An Attempt to Standardize My Username Across Platforms > Demon-Xanth knows how to operate a street. 02/08/2017 at 13:06

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Ford 427 SOHC. Admittedly, most of them were chain drive.

Ash78, voting early and often > bhtooefr 02/08/2017 at 13:08

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Wow, I had no idea the V10 Touareg was “direct drive.” That’s very Hipster Audiophile of them.

and 100 more > Demon-Xanth knows how to operate a street. 02/08/2017 at 13:13

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“That’s cute.”

and 100 more > RamblinRover Luxury-Yacht 02/08/2017 at 13:14

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Plastic cam gear, for real??

EDIT: I’ll be god-damned.  

Over the years, the Tech IV engine has proved to be a reliable, albeit, workhorse for owners when not pushed to its limits. All 1978-1990 Iron Duke L-4's are outfitted with a micarta camshaft gear that meshes directly with a steel gear on the crankshaft (no timing chain), a design also used by the Chevrolet inline six. 1991-92 VIN R and U engines received a timing chain. The timing gear has a tendency to crumble a tooth anytime after 80,000 miles. The cam gear simply shears a tooth at startup and the engine won’t start; because of the non-interference design of the engine, no further damage occurs. When the cam gear loses a tooth, the camshaft AND distributor stop rotating during engine cranking. Replacing the gear requires heating the new gear in hot oil and quickly installing it for a shrink(interference) fit on the cam stub. One upgrade is the use of the aluminum camshaft timing gear from a Chevrolet 250 inline six with the Iron Duke’s crankshaft timing gear.

Urambo Tauro > RamblinRover Luxury-Yacht 02/08/2017 at 13:20

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Is that whole thing plastic?

It’s probably not the same thing, and it might not even be the same material, but I remember my father telling me about his ’72 Impala’s timing failure thanks to a nylon gear. I tried to Google it, and it sounds like it was actually just nylon- coated . Still a dumb idea.

RamblinRover Luxury-Yacht > and 100 more 02/08/2017 at 13:27

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Yes. Really. Some little Fords were that way as well, and some industrial big Chevies. Some Ford big-blocks Olds big-blocks and others also used plastic on their sprockets for as a facing over steel:

Not capable of instant catastrophic failure due to the sprocket, but dropped little bits of plastic into the oil, which could clog things.

The advantage to the Iron Duke, such as it was, was that it tended to fail neutrally (non-interference engine) on shutoff, so it would work one day, and then suddenly not. Pull timing cover, replace gears, done.

RamblinRover Luxury-Yacht > Urambo Tauro 02/08/2017 at 13:30

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Yes, the whole Iron Duke timing gear was plastic. Tended to fail engine off, neutral position, so it just would refuse to start, suddenly. A couple of other engines have done that as well. As to the plastic-coated sprocket, something GM and Ford and Mopar all played with, with mixed results. Not *all* that likely to fail instantly and catastrophically, but if you jumped time too far, a problem, and flakes of plastic in the oil pickup are no bueno.

cluelessk > Demon-Xanth knows how to operate a street. 02/08/2017 at 13:35

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They make timing gear conversions for small block Chevy’s. They make a ton of noise.

aberson Bresident of the FullyAssed Committe > Die-Trying 02/08/2017 at 14:05

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that looks noisy

HFV has no HFV. But somehow has 2 motorcycles > Demon-Xanth knows how to operate a street. 02/08/2017 at 14:13

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What happens when one of those ball bearings decides it’s had enough of your crap?

Frank Grimes > Demon-Xanth knows how to operate a street. 02/08/2017 at 15:10

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porsche dont give a crap about things also

OKcarburetor > Frank Grimes 02/08/2017 at 15:23

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Except for the 924/944/968 and 928. Worst timing system ever.

kanadanmajava1 > and 100 more 02/08/2017 at 15:32

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Panhard also used plastic (actually a weird composite material called “Celeron”) gears in certain models with opposed piston two cylinder engines in 50's and 60's. Note that the gear is also double helical. The mating gear is a metal gear. 

One other interesting choice for timing gear is “three throw drive” used in 6 cylinder Bentleys (in 30's before RR bought Bentley). The system used three connecting rods to turn the camshaft. Some obscure motorcycles used similar system too.

Before this they used bevel gears and vertical axle to turn the camshaft.

Die-Trying > aberson Bresident of the FullyAssed Committe 02/08/2017 at 15:32

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it is........ those straight cut gears sound like a supercharger.....

Nauraushaun > Demon-Xanth knows how to operate a street. 02/08/2017 at 16:02

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are we talking about the same MC12

Demon-Xanth knows how to operate a street. > Nauraushaun 02/08/2017 at 18:27

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