383stroker dieseling at 2 degres - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-04-2010, 10:59 PM
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383stroker dieseling at 2 degres

Changed timimg from 2-4-6-8-degres base,no vac. advance at this time.Shut off at 900 rpm still diesels. Carb not fat, not bleeding over, went to colder plug. cam 108+4 hyd total lift .489-489. alumin. heads,tried different carbs ,jetting and distributors. Not running hot. No carbon builbup on plugs. New build less than 50 miles. Running 87 octane. Compression ratio 9.8 to 9.9. Any help appreciated. Working with for two weeks.

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Old 05-05-2010, 12:09 AM
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Try more initial timing, say 12 to 14 degrees. Watch total timing. Do a search here for some timing advice, I've got a blower motor and us much more timing than you would want to use.
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Old 05-05-2010, 12:27 AM
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Your compression is too high for 87 octane, you need 91-93
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Old 05-05-2010, 01:15 AM
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Can someone explain to me how timing has anything to do with dieseling? Isn't the ignition OFF after you turn the key in the off position, therefore no spark is going to the plugs.

Try the higher octane fuel i bet it helps at least a little bit.
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Old 05-05-2010, 04:35 AM
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Quote:
Originally Posted by ericnova72
Your compression is too high for 87 octane, you need 91-93

not arguing with you here, but my 350 has 10:1 and it runs fine on regular gas. should be fine with aluminum heads.maybe cam is a little different?
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Old 05-05-2010, 06:10 AM
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needs higher octane. a colder thermostat may help too.
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Old 05-05-2010, 02:53 PM
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I'll go with the higher octane opinion 92 minimum

Is the carb running lean? I think lean will cause this.

Ignition timing should have no effect except for causing pinging. I have my 383 stroker at something like 18' initial timing.
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Old 05-05-2010, 03:13 PM
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My 355 did the same thing till I advanced the timing to 16 deg.Kept trying to retard timing with ill effects.
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Old 05-05-2010, 03:14 PM
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Dieseling is most likely caused by glowing red hot valves, a lean mixture is just one cause of excess heat in the combustion chambers/valves,Valve timing ( camshaft)could also be a factor,Its time to recheck everything, best of luck and maybe you will keep us informed when you solve the problem.
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Old 05-05-2010, 03:49 PM
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incorrect timing can cause combustion chamber temps to rise causing dieseling, the higher octane will help but she gonna need more timing as well, just finishing building 383 w/aluminum heads for a friend, started at 12 degrees with 91octane it dieseled like nobodys business, recurved distributor to prevent excess total timing and set initial at 19 and it is strictly mech advance, still running 91octane runs 10x better and no dieseling
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