John Schmidt
Member
Posts: 15236
a/k/a Stuffy. '99 I/S Valk Roadsmith Trike
De Pere, WI (Green Bay)
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« on: February 14, 2014, 04:35:36 PM » |
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Reworking an old '84 Std. Wing, engine swallowed a valve. Three of the four pistons are fine, but the one has a hole the size of a fifty cent piece. I'm picking up a used set of pistons with only 19k on the engine, will only use one of the pistons. I questioned the mileage and the service record bears it out, bike sat for quite a while before being run again. An accident took it out of circulation finally. I've done this before on car engines with good luck, just made certain the end gap on the rings were within specs. I honed the cylinder it's going in and will check the ring gap on this project, but see no reason to invest in new rings. Will use new a rod bearing though. Just curious if anyone has ever done that on a bike motor, in this case an old Wing four cylinder. Scarcity of parts is the leading cause of reusing the rings, unless I can find a good source. Any thoughts on this, I'd like to hear your experience.
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Challenger
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« Reply #1 on: February 14, 2014, 05:00:10 PM » |
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Ive done it many times on small engine and even on a few of my stock car engine with no problems, I usually use a ball hone to take the sharp edges out of the cross hatch before assembling. Don't know if Honda rings were plasma coated back then. If they were it might use a bit of oil eventually.
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BeeSharp
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« Reply #2 on: February 14, 2014, 05:13:20 PM » |
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That 84 was the last of the standard wings, first 1200 and fairly rare, so worthwhile putting some time into the project. I'm getting out of cyl wings, but if I found that model I would jump on it.
I would reuse rings, but I could never call myself an engine guy.
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98 Valkyrie - The Black Pearl, a fine ship-n-crew, arrr matey!
77 GL1000 The Mach5
83 GL1100 Top Gun Project
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pancho
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« Reply #3 on: February 14, 2014, 05:30:58 PM » |
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I've done it on Harleys and Moto Guzzi,s plenty of times,, like you said, hone the cylinders, check the end gap, make sure the cylinder they came out of did not have any issues. I have had good luck doing it, but always on lower rpm motors.
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The most expensive things you will purchase, are those things you would not have needed if you had listened and obeyed.
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salty1
Member
Posts: 2359
"Flyka"
Spokane, WA or Tucson, AZ
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« Reply #4 on: February 14, 2014, 06:02:44 PM » |
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Hope you find a source for the rings John. For a seasoned mechanic like yourself to reuse rings, they must be hard to find.  |
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My rides: 1998 GL1500C, 2000 GL 1500CF,2006 GL 1800 3A   |
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John Schmidt
Member
Posts: 15236
a/k/a Stuffy. '99 I/S Valk Roadsmith Trike
De Pere, WI (Green Bay)
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« Reply #5 on: February 14, 2014, 06:30:08 PM » |
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Hope you find a source for the rings John. For a seasoned mechanic like yourself to reuse rings, they must be hard to find. I believe they're available, just not in large numbers and the various oversized sets are even more scarce. I'm waiting on the used set of pistons/rods and will be looking for a source for rings and bearings. Sometimes I wonder why I started this darn project.  |
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art
Member
Posts: 2737
Grants Pass,Or
Grants Pass,Or
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« Reply #6 on: February 14, 2014, 06:57:25 PM » |
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Yup, I used them on a 63 jaguar six cyl. engine. Had to switch blocks and used the internals for the good block. After machining the bores to fit the pistons and rings it worked great. That was a high performance engine.
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Attic Rat
Member
Posts: 446
VRCC # 1962
Tulsa, OK
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« Reply #7 on: February 15, 2014, 06:45:34 AM » |
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John as long as the rings look good and the end gap is with in specs. Run them they will be fine.
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The Attic Rat Performance Works
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Grandpot
Member
Posts: 630
Rolling Thunder South Carolina Chapter 1
Fort Mill, South Carolina
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« Reply #8 on: February 16, 2014, 09:10:43 AM » |
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The only time new rings will have an advantage is when you also bore the cylinder. If you aren't going to do that, used rings should work just as well. It's like going on a first date, you have to get lucky sometime.
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 Experience is recognizing the same mistake every time you make it. |
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da prez
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« Reply #9 on: February 16, 2014, 10:06:58 AM » |
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If you are not re-ringing the whole engine , then put in used rings. Remove the rings and clean the grooves. Check the cylinder for glaze or gouge. Only clean up to match the other cylinders. This should help to keep the engine in balance as far as cylinder pressure.
da prez
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