From: bowmanj@csn.org (Jerry Bowman)
Subject: Re: Gasoline differences?
Organization: University of Colorado Boulder, OCS
Date: Mon, 14 Dec 1992 18:31:43 GMT

In article <jimd.724272848@sfu.ca> jimd@fraser.sfu.ca (Jim Davies) writes:
>kenny@osf.org (Kenneth Crudup) writes:
>
>>In article <39670095@hpcc01.corp.hp.com>
>>mtc@hpcc01.corp.hp.com (Mark Cousins) writes:
>
>>>>Well, first off, you should ask yourself why you're using Super in that car.
>
>>>I have.  The answer is that if I don't, I get excessive pinging and
>>>detonation.  And I've don't buy the lore that mild detonation is OK -- I don't
>>>want any.
>
>>>I have gone over the tuneup very carefully, and with everything set to spec
>>>the result is too much knock for my taste.
>
>>Ok. Good- you know what you're doing. If you can vouch for the timing in your
>>car, I would then say that you've probably got carbon buildup in your
>>combustion chambers. Now, how *I* get rid of it, and how you should get rid
>>of it are probably different, as you can mess something up if you're not 
>>careful.
>
>>What I do is get some water, and start the car, and let it warm up to full
>>operating temperature. I then snatch off a manifold vacuum line, and put
>>a length of hose on it (I use something w/a narrow diameter to limit
>>water flow- I don't grab the brake booster line!). I run the engine at 2k
>>rpm, and lower the other end of my line so that it just touches the surface
>>of the water in the container (use about 1/2 quart). The engine vacuum will
>>suck the water up, and I regulate the flow, letting a little more in, but
>>being careful, as water is incompressible, and too much will blow your head.
>
>>I assume your Honda has carburation; I have to find a mani vac line 'cuz I
>>have fuel injection, but you should be able to slowly (a trickle) dribble
>>water right down the carb throat.
>
>>I've used this in the past to get rid of carbon on my Merkur.
Once you get that puppy cleaned out you might consider a water vapor injection system. They are very inexpensive and though i havent experienced the advertised increase in mileage and power i have used them on several engines and they keep the combustion chambers clean enough to eat out of.>
>
>Water, in my experience, is the best way to remove carbon. Its certainly
>superior to any of the spray type cleaners I have seen, and, of course,
>the price is right ;-) Your method sounds good to me, the only minor
>thing I would add is this: on V type engines, be sure that approx. equal
>quantities of H2O get in either side of the manifold eg spray down
>both sides of carb/injector. I often use a 1 liter dishwashing liquid
>*joy, etc* plastic squeeze bottle. With the popup top on it, gentle
>squeezing will supply an adequate amount of water. I find I have to
>regulate the throttle with my other hand to keep the rpm about 2000
>or so. As stated, water is non-compressable, so:
>engine up to temp
>firing on all cylinders
>controlled amount of water into engine
>keep revs about 2000
>Of course, after this treatment, you have to give the car a good, hard
>run. Running thru the gears at WOT is helpful, but nothing beats a good,
>hard flog in top gear to loosen up and remove the gunk ;-)
>If you wind up talking to a cop, well, dont mention my name ;-)
>
>Jim Davies
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