formulafastfoot

ok so my car is a 89 firechiicken formula 89 tpi 350 mostly stock ive had bad vavle guides seals for about 50,000 miles and im wondering about carbon biuld up and whats the best way to clean the inside of the motor from the inside without taking the heads off i also run on 93 always so if you could help out i would be thankful

Vader

There are a couple of factors involved. While you may have excess carbon from some oil burning, there may also be deposits from the fuel additives frequently used in higher octane gasoline blends.

Short of removing the heads and mechanically removing any accumulation of deposits, water injection can do an excellent job of cleaning chambers. When ingested into a hot combustion chamber, the water explodes into steam and softens the deposits that may be there.

This should only be done with a fully warmed engine, and water needs to be metered into the intake slowly so that adequate water vapor is present to allow cleaning but the volume of liquid water is not so great that it can get into the chambers as liquid and potentially cause damage (hydrolocking). Don't increase the engine RPM any more than necessary to keep the engine running, since the amount of time the steam remains in the chambers will be increased if the engine is running slower.

As for adding cleaners to the fuel tank to help clean chamber deposits, I try to avoid those since anything that gets to the chambers has to travel through the injectors. Water and fuel injectors is not a good combiination, which is why SeaFoam should NEVER be used in the fuel of an injected engine.

91GTABird

I have added Seafoam to my brake booster for some time now. Seems to keep the plenum haflway decent. I also spray my Air Filter with alittle water steadily when i wash the car. Im assuming thats a way of metering the amount of h2o that enters the engine.

I wasnt aware of what Vader posted above. Thanks for the info though.

305TA85

this is more to Vaders post, if you read this again I know that the water injection is an old timer trick, it is like using tranny fluid to loosen up your ticking valvetrain, but I was told that these have not been used in fuel injection because it may fault the o2 sensor and the car will run really rough until the alien fluids are out of the engine .

Red Devil

How in the world do you propose that the O2 sensor differentiates between combustion formed water and injected water?!? If you 'heard' it, don't share it, if you 'know' then you can. The only thing that may happen is the sensor getting mucked up and that possibility decreases with a warmed motor as Vader suggested.

You aren't supposed to use tranny fluid anymore. The old trick was to spray/dribble water or tranny fluid down into the carb. If you use tranny fluid you have the potential to foul the O2 and plugs with the tranny fluid.

The problem the poster is going to have isn't necessarily in the combustion chamber. He likely has some nice crud on the backside of his valves and while commercial products like Techron do a measurable job at decreasing those deposits, there is no 'simple' way or removing them.

Dyno Don

iTrader: (7)

There is a product that GM has called X66P that will do the job of removing those nasty deposits on the back of the vavles and the carbon in the cylinders.

MdFormula350

Gm has top end cleaner, i bought a spray can of it and a regular can of it, i need to use it on my 01 ws6, might as well do the formula well.

Lo-tec

I would use the GM top engine cleaner you pour in. You rev the engine up as you pour the whole can in slowly, and then it either dies or you shut it off. Let sit overnite, and it eats up the carbon in the combustion chamber. Makes some really cool, stinky smoke when you fire it up the next day.

MdFormula350

yeah from searches on other sites, it goos to change the oil at the very min. so i have to wait alittle longer.