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Best Opti????

Old 02-11-2019, 09:01 AM
  #16  
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Re: Best Opti????

I got pretty lucky,I think. A local dealer had a brand new GM Opti, in the box covered with dust on his shelf. He was glad to finally get rid of it and gave us a good deal on it. It’s a vented one so we replaced the original line with new line and sealed everything up. New water pump too.

this is on my 94 Buick Estate Wagon.
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Old 02-11-2019, 09:31 AM
  #17  
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Re: Best Opti????

Wasn't Delphi actually part of GM until it was spun off? I always considered their stuff to be OEM even if it wasn't branded ACDelco. Regardless, it seems they haven't been manufacturing optis for a few years now. I don't think I ever saw a remanufactured Delphi, unless they were doing them for ACDelco.

I bought a couple of spare ACDelco/GMPP units several years when Summit was clearing them out. I guess I'm glad that I did.

Last edited by BTC; 02-11-2019 at 09:34 AM.
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Old 02-13-2019, 09:00 PM
  #18  
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Re: Best Opti????

Bentwings BTC If ever your optispark goes bad, for whatever reason, there is a guy on ebay who refurbishes only genuine OEM optisparks with the Mitsubishi sensors. He goes by the name berrington1.
https://www.ebay.com/itm/Optispark-reconditioning-service-with-data-that-it-works/322692854278?epid=2211552581&hash=item4b21fe3206:g :Tj0AAOSwVm5ZARQg:rk:1f:0#rwid

I figure it is a way to help preserve your OEM optispark if the sensor is not what failed on it and it helps small-time business people who can contribute to the classic car industry and keep our cars running well beyond their expected lifetime. I certainly will fight to keep my LT1 bird going strong into the coming decades, so long as the New Green Deal doesn't force me to part with her...
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Old Yesterday, 11:43 AM
  #19  
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Re: Best Opti????

Phoenix and all,

I like what Berrington1 is doing with his rebuilds as well (though I do not have one on my car). He claims to be a 20 year veteran test engineer and given his test bench photo and what he is testing I don't doubt his claim.

He is heating the unit while it is on the scope which may be very important. I used to work in a semi-conductor reliability department and we saw a lot of returns and problems with devices that tested good at room temp but then failed at elevated temperatures; usually due to stresses induced by different rates of expansion in the device packaging or the printed circuit board material. Berrington claims to be bringing the opti up to 180F operating temperature and is verifying that the outputs are not degrading at temperature.

He also claims to be seal testing the units which (if true and done correctly) is a big difference from the less expensive new unit sold at Summit (the last time I bought one anyway). The Summit unit did not have a sealed rotation input bearing and would not give me any vacuum reading when I pumped it with my mini mighty vac tool.

Last edited by squarehead; Yesterday at 05:18 PM. Reason: spelling
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Old Yesterday, 12:02 PM
  #20  
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Re: Best Opti????

I should find my factory opti and send it to him for a rebuild. I don't know what I did with it when I replaced it, but I don't believe I would have thrown it away. The one I replaced it with is supposedly an ACDelco that I bought off of someone on this site many years ago. It's got about 500 miles on it and I bought a couple from Summit Racing back when they were clearing them out in 2012-2013. I don't think I need another opti, but I guess you can never have too many.
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Old Yesterday, 01:04 PM
  #21  
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Re: Best Opti????

Originally Posted by BTC View Post

I don't think I need another opti, but I guess you can never have too many.
LOL!

I think that Berrington1 pays a bounty on old original Delco units so it might be worth your trouble make the search.
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Old Yesterday, 02:36 PM
  #22  
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Re: Best Opti????

45 year electrical test engineer here. A photo of my Opti test setup in 2015. The Opti is mounted in the plywood box. A DC motor is used to spin it at varying speed: A 150 watt incandescent light bulb is used for temperature setting and a temperature control keeps the temp at a preset level.The supply current and waveforms are monitored continuously. A PC is attached and will log the time of loss of either Hi or Low res signal, or dc supply current.


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Old Yesterday, 05:17 PM
  #23  
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Re: Best Opti????

Hi GaryDoug,

Have you checked out what Berrington1 is doing with the opti rebuilds on eBay? What do you think?

The photo of his test rig will look familiar to you!
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Old Yesterday, 06:53 PM
  #24  
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Re: Best Opti????

He is about 4 years behind me ;-) See this one in 2014 with a hair dryer:
And this post #10 in this topic in 2015 using a portable heater:
https://www.camaroz28.com/forums/lt1...talled-877594/

In both cases I found the heat soak to be inadequate unless the Opti was placed in a chamber. Otherwise the heat did not soak evenly. I purchased one very cheap Opti on eBay just for evaluation and it has held up so far to this type of bench test, but I would never use it in a real engine as that environment is far more stressful. In other worlds I don't think his test is enough. Nor is mine.

But I normally do not repair these. I have done only 5 so far just for friends. Only with one was I not able to repair it, and it was a real OEM version with a bad amplifier board. The amplifier board is hidden under the the metal plate opposite the optic sensor.




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Old Yesterday, 10:09 PM
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Re: Best Opti????

Thx for posting.
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Old Yesterday, 11:20 PM
  #26  
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Re: Best Opti????

Too bad my original got trashed before I knew about the rebuilds possible. I think I’ll hit the U Pull in the spring after the snow goes away and see if I can find another OEM unit to get rebuilt just in case. I’d really like the new one to go a 100k. The car will probably be done in by then.

I really should also look for another wagon. Buy it and store it. That way I’ll have a car until they take my keys.LOL
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