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Spark Plugs

Old 05-22-03, 11:27 PM
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Question Spark Plugs

Burning up plugs after two races.....any suggestions?

Her engine is nothing too special as the class we run in does not allow many modifications to the engine. She has a 12A carb. engine with '85 manifold. We have used cheap and top of the line plugs but she is eating them up after a race weekend.
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Old 05-26-03, 12:37 PM
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what plugs are you running? Hotter plugs will burn hot, but run the motor cooler. IF you are running hot plugs with too lean of a mixture, the plugs will burn so hot they will actually burn themselves up. SRX7 has almost the same rules as what you are describing (stock motor, carb, etc). what fuel pressure are you running? and how is your timing set?
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Old 05-26-03, 10:44 PM
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try running an 11 heat range plug of choice and timing no more than 24*. good to check egt or AF ratio.
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Old 05-29-03, 12:56 PM
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no more than 24 lead and 16 trail.... even that burns up motors. BUT........ we be racin'
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Old 05-29-03, 01:20 PM
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with proper engine tuning 24* should be fine and not damage the engine. running a colder range of plug will help.
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Old 05-29-03, 07:10 PM
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the combination of 24/16 timing and 1.5 - 2 pound of fuel pressure, and running hot.... burns up motors after about 2-3 seasons.
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Old 05-30-03, 08:29 AM
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Thank you everyone. I going to try your sugestions for my next race.
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Old 05-30-03, 10:15 AM
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the combination of 24/16 timing and 1.5 - 2 pound of fuel pressure, and running hot.... burns up motors after about 2-3 seasons.
this is not what I would call a properly tuned engine.
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Old 05-30-03, 12:49 PM
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maybe not, but thats what SRX7 drivers with years of experience, dyno time, and experimentation call it.
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Old 05-30-03, 02:28 PM
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I see this is a bit of a jab at someone else then? be careful with so called experts(me included) and verify the "hot setup" on your own. good luck with your engine "tuning".
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Old 05-30-03, 07:21 PM
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ok, this isnt getting anywhere and i really dont wanna fight but.... isnt it a known fact these engines make the most power running hot and lean? assuming stock ports, manny, carb.
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Old 05-31-03, 12:12 AM
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sorry, not in my experience. but if you can afford the tear downs and it is working keep doing it.
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Old 05-31-03, 01:42 PM
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well thats what i meant by "we be racin".... it will drastically decrease the life of the motor to the point where it will only last 2 seasons. but its all the price you pay to be competetive with the top drivers.
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