The Ordeal of the Camshafts - Page 3 - LotusTalk - The Lotus Cars Community
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post #41 of 45 (permalink) Old 10-13-2017, 11:52 AM
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This is kind of a late addition to this but Since they started reducing the amount of ZZDP (zinc) in motor oil that was it for engines with sliding high pressure parts (like the 2ZZ has). if using an additive that contains zinc bothers you use one that had inert property’s (like boron) there are several on the market Archoil has one AR9100 friction modifier you have to add it with every oil change though.
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post #42 of 45 (permalink) Old 10-17-2017, 12:31 PM
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Not really.... the cam is considerably harder than stock and these blanks and cams tend not to wipe on the bigger "stage X" cams.... that said, there are obviously no guarantees. The system is obviously flawed from the onset. Guaranteed not to wipe comes with the Ferrea solid roller rocker, but that's not for everyone.... These intake cams will improve the durability but not cure the inherent design flaw in the head...

Cheers,

Phil
I've read a number of these wiped cam threads and I thought the consensus was we didn't know what the cause is. But you seem to be saying here that it's a defective head design. If so, what's the defect. And wouldn't this mean that all 2zz engines, or at least all of them in our cars, will fail (all have the same head design)?

The last post mentioned lack of zinc in the newer motor oils. I thought this was only a problem for older cars designed to run on non-synthetic dino oil?

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post #43 of 45 (permalink) Old 10-17-2017, 12:46 PM
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I trust Phil a lot. But, I don't know about the design flaw in head at all.

Note that cam probs were rare among Toyotas with this engine.

5-30W oil, no oil coolers. (I asked a Toyota engineer friend.)

I saw a few engine builders stress to not engage cam switchover until 20 or so minutes after coolant was fully up to temp.

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post #44 of 45 (permalink) Old 10-17-2017, 02:48 PM
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I suspect it depends on how one defines the word "flaw".... to me, it's a terrible design from several angles... But hey, it's what we have, so we live with it....

That said, Yamaha, could take a few queues from Honda on the VVTL concept. Honda's is MUCH more robust and FAR less finicky... lighter too... less complex... and, and, and...

Again, it's what we have... I'm not into swapping motors in it because at some point it's just not a Lotus no-mo... but the 2ZZ isn't ever going to be a legendary motor, IMHO... and there are very good reasons for that...

-Phil


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post #45 of 45 (permalink) Old 10-17-2017, 03:31 PM
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Yep, it's a combination of problems with our motors.

The 2zz's oil pump does cavitate pretty bad at higher RPMs. Consider also that our cars add about 27 feet of oil line for coolers up front which strains ideal oil pressure (not a problem for the Celica crowd). Now add overcooled oil and an aggressive driver to the mix and it's no surprise that we see more wiped cams than the Celica owners.

I'm still not sold on our intake cams being faulty from Toyota. I inspected my intake cam two years ago when I installed a single rear oil cooler. The lobes checked out fine for 11k miles, but others here with similar or even less mileage already had scoring and flat spots. I'll be inspecting my cams again in the coming months to see how they've held up.
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