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- Newsgroups: rec.autos.tech
- Path: sparky!uunet!destroyer!cs.ubc.ca!newsserver.sfu.ca!sfu.ca!jimd
- From: jimd@fraser.sfu.ca (Jim Davies)
- Subject: Re: Gasoline differences?
- Message-ID: <jimd.724272848@sfu.ca>
- Sender: news@sfu.ca
- Organization: Simon Fraser University, Burnaby, B.C., Canada
- References: <39670094@hpcc01.corp.hp.com> <39670095@hpcc01.corp.hp.com> <1992Dec9.200724.15532@osf.org>
- Date: Sun, 13 Dec 1992 18:54:08 GMT
- Lines: 62
-
- 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.
-
-
- 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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