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E85 and Ethanol This section is dedicated to tuning with ethanol.

Injector "gunk" and E-85

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Old Sep 12, 2017, 02:31 PM   #286
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In older cars sure, but fuel systems have been designed to be chemically tolerant of Ethanol since the banning of MTBE as a gasoline oxygenate. My take from the various literature is that Ethanol being a really good solvent, any contamination along the entire supply chain up to and including the junk in your cars fuel system will be dissolved and accumulate in the injectors. I have also read that the recirculated gasses from PCV etc when coming into contact with the injectors cause an accumulation of junk. Its probably a combination of all the above and some other misc factors. Injectors get clogged all the time just running straight gasoline too so its not like its a unique problem to E85 either. Plus the stuff MinusPrevious just posted.
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Old Sep 12, 2017, 05:44 PM   #287
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MinusPrevious is correct on the primary source of the black gunk. There is evidence that PCV or EGR can contribution. Old non-ethanol compatible hose argument may have some truth, but it doesn't apply to the Evo fuel system. Its totally up to the job.
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Old Sep 12, 2017, 06:08 PM   #288
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Quote:
Originally Posted by mrfred View Post
MinusPrevious is correct on the primary source of the black gunk. There is evidence that PCV or EGR can contribution. Old non-ethanol compatible hose argument may have some truth, but it doesn't apply to the Evo fuel system. Its totally up to the job.
Im certainly not the one credited w/that analysis. The poster was a petroleum engineer type.

I did some internet searches & the PIB casual factor has been reported by more than a few experts in the field
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Old Sep 12, 2017, 07:44 PM   #289
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Yeah, I think that article has been widely referenced. I've got a copy of it in my files. :-)
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Old Sep 17, 2017, 12:39 AM   #290
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I've had a set of injectors lying around for years.
They've only been used with petrol and when it came to flow test time they were all severely blocked. 25% or so of the original flow.
After soaking in ethanol for a while (flow testing also with ethanol), most of them recovered their original flow values.


That's because petrol, even though it's a really good solvent, there's insoluble impurities in the fuel which cause blockage.
What isn't soluble in petrol IS usually soluble in alcohol.
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1450cc, 85, additives, deposits, e-85, e85, evo, fuel, gas, goo, gunk, injection, injector, injectors, ran, tips

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