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Old 06-10-2006, 12:42 AM
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Stp Engine Cleaning Crap..good Or Evil???

I just wanted to know if these engine, fuel, and oil additives are really all they are cracked up to be??? I put some in my chev 305 and i think it screwed up my spark plugs... did I just pour car poison into my fuel tank????

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Old 06-10-2006, 02:24 AM
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The general concensus on the topic of most additives is that they are a waste of money. I personally havent used an STP product that seemed to do anything useful. There are a lot of topics on this board about this and I suggest doing a search to learn more.
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Old 06-11-2006, 05:52 AM
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In my old days we revved the engine up and poured a bit of water down the carb to clean out the carbon in the exhaust chamber. We had one old chevelle driven by an old feller and man the crap that came out of the exhaust was unbelievable. It works but must be done very gradually. This is the only thing that I think has ever worked to clean the internal combustion chamber without taking the engine apart.
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Old 06-11-2006, 06:53 AM
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For the most part pour in additives are a load of cra%. They are designed to work on your wallet more than your engine. Water applied conservatively into a running engine is more effective than anything at removing carbon deposits. Have you ever seen an engine that has had a blown head gasket? That piston top looks almost brand new as the water has cleaned it off.

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Old 06-11-2006, 09:13 AM
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The only "additives" that I have had good results with are:

- Seafoam
- CD-2 FI/Carb cleaner (made by the PB Blaster people)

The Seafoam is used like you would use water down the carb. You run the engine, pour some down the carb. And then you shut it down. After five minutes, restart the engine and watch the junk fly out of the pipes. Works pretty good, but not sure if it works any better than water.

The CD-2 has been a real help with motorcycles I own. My Triumph had developed a slight stumble on take off and would run a little rough at steady speeds around town (40mph and below). Those problems are now gone after treating the last tank. I also used it earlier this season on a Yamaha I bought and resold. The owner stored it with no Stabil and the carbs were gummed. It did a nice job of un-gumming the carbs and save me a lot of time while I was prepping it for resale. I hate synching 4 carbs....
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