C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

optical distributor a new thought

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Old Jan 23, 2019 | 03:46 PM
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From: Troy Al
Default optical distributor a new thought

Those who know me know I've had a history of opti failures. Here is a new angle. Every time I crack one open, I see lots of rust. Not good. Here in Alabama at just over 150 ft. ASL there's lots of humidity. LOTS! It makes the summer supper hot, and the cold in the winter just cuts right through you. I was reading a post from a guy who keeps his vette in a climatized garage. I wish I had that. What about you folks that live in Arizona, Utah, or other mid-west states with little or no humidity? Do you find yourself except from opti failures?
btw- I sent my last opti up to the opti doctor just this morning. I hope he can do magic, and fix it for good this time on my 93.

Thanks
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Old Jan 23, 2019 | 04:08 PM
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You have a 93 - that means you have the unvented opti. You need to get a vented opti - that will go a long way towards fixing the problem.
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Old Jan 23, 2019 | 04:11 PM
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Originally Posted by sstonebreaker
You have a 93 - that means you have the unvented opti. You need to get a vented opti - that will go a long way towards fixing the problem.
The optidr will fix that
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Old Jan 23, 2019 | 05:35 PM
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Did the one you send him have a Mitsubishi sensor? Did you tell him to set it up for changing to vented? Dan
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Old Jan 23, 2019 | 06:55 PM
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So you specifically asked if people who live in areas of high humidity have problems with their opti. I live a little north of Seattle. We do not have the type of summer humidity that you experience however from October through April (and some years through June) it rains here every day. Not just for a few minutes but almost 24 hours a day 7 days a week.

Over the past 14 years I've put over 100K on my 95 and really without exaggeration .... at least 50K have been driving in the rain. The car would sit outside all day in the rain at work (on the water front) and then in a non heated garage at night. Knock on wood I've had no issues with the Vented Opti on my 95. The only time the car left me stranded was when the sprag broke in the 4l60e a couple of years ago.
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Old Jan 24, 2019 | 02:23 PM
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I plan to vent the unit next time around. I hope that will help.
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Old Jan 25, 2019 | 07:10 AM
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I'm curious about the rust. Do you have any pictures?

Humidity is pretty stifling around here too, but mine have shown no signs of rust.

A good post-mortem is important with these things. When my Petris failed, I expected it to be full of oil or coolant. Nope. The bearing had so much play, it allowed the reluctor to rub against the sensor.

IMO, people spend too much time wringing their hands over the extinct Mitsubishi sensor. The double shoulder bearing used in the OEM is extinct as well. Even the latest optidoctor can't source one. The tolerances between reluctor and sensor are very tight.

If I could replace the bearing in this Petris and clean up the sensor, it would likely work just fine.


Ah, there' the rub.
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Old Jan 25, 2019 | 08:14 AM
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Dang, if it's that hard to find parts, wouldn't it be easier to switch to a distributorless system?
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Old Jan 25, 2019 | 02:37 PM
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Originally Posted by choopes
Those who know me know I've had a history of opti failures. Here is a new angle. Every time I crack one open, I see lots of rust. Not good. Here in Alabama at just over 150 ft. ASL there's lots of humidity. LOTS! It makes the summer supper hot, and the cold in the winter just cuts right through you. I was reading a post from a guy who keeps his vette in a climatized garage. I wish I had that. What about you folks that live in Arizona, Utah, or other mid-west states with little or no humidity? Do you find yourself except from opti failures?
btw- I sent my last opti up to the opti doctor just this morning. I hope he can do magic, and fix it for good this time on my 93.

Thanks
Hmm? I never considered humidity. But that could be an issue also. This makes me think the Opti's optical senor requires a "clean air" system by itself. Don't know how to remove humidity though because your looking at a more complicated sub system that might require a lot of maintenance itself.

Really the access to change the Opti's is what's making maintenance such a problem. If it had a an extension drive mounting for easier access up top somewhere replaceing the Opti would be more something to joke about than complain about. But removing the water pump and then then dampner deserves complaining.

Please let us know how your replacement Opti works out.
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Old Jan 25, 2019 | 05:25 PM
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The rust isn't all from humidity. It's from the creation of ozone inside the cap.
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Old Jan 25, 2019 | 05:44 PM
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Originally Posted by Renfield
I'm curious about the rust. Do you have any pictures?

Humidity is pretty stifling around here too, but mine have shown no signs of rust.

A good post-mortem is important with these things. When my Petris failed, I expected it to be full of oil or coolant. Nope. The bearing had so much play, it allowed the reluctor to rub against the sensor.

IMO, people spend too much time wringing their hands over the extinct Mitsubishi sensor. The double shoulder bearing used in the OEM is extinct as well. Even the latest optidoctor can't source one. The tolerances between reluctor and sensor are very tight.

If I could replace the bearing in this Petris and clean up the sensor, it would likely work just fine.


Ah, there' the rub.

the mitsubishi optical sensor holds up in the heat where the others dont.

A custom vent needs added to the 92-94 designs that dont have one to vent out ozone, carbon, and any other corrosive elements that somehow make their way in
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Old Jan 26, 2019 | 02:16 AM
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They fail out here, too.
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Old Jan 26, 2019 | 05:51 AM
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Originally Posted by dizwiz24

the mitsubishi optical sensor holds up in the heat where the others dont.

A custom vent needs added to the 92-94 designs that dont have one to vent out ozone, carbon, and any other corrosive elements that somehow make their way in
Yes, we all know this. What has that got to do with the post you quoted (mine) about the bearing failure?

No sensor holds up to a rubbing reluctor.
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Old Jan 26, 2019 | 01:26 PM
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Originally Posted by Renfield
Yes, we all know this. What has that got to do with the post you quoted (mine) about the bearing failure?

No sensor holds up to a rubbing reluctor.
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Old Jan 26, 2019 | 06:45 PM
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Originally Posted by Renfield
Yes, we all know this. What has that got to do with the post you quoted (mine) about the bearing failure?

No sensor holds up to a rubbing reluctor.
you got me. I cant address that issue.

i havent had it happen and hope not to!
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