Broken fins on cylinders

Gobusgo · « **on:** March 02, 2006, 01:13:41 PM »

I received a cylinder/piston set from an eBay seller today and two of the cylinders had broken fins. I have already contacted the seller about returning them. What I want to know is are the cylinders "usable" as in installing on an engine?
This seller has a 5-day, any reason, money-back guarantee. I am going to take advantage of the guarantee, but was just curious about the broken fin thing.

Zen · « **Reply #1 on:** March 03, 2006, 02:08:49 AM »

If the cylinder has a broken fin, you are going to have a deminished cooling ability in that area. There will be "hot spot" on the cylinder in that area . . . just how hot and exactly what it will do to the cylinder depends on the the exact size and location of the broken fin. If it's a big chunk of fin, and especially if more than one fin is broken in the same area, it will probably (at a minimum) cause the cyclinder to warp and loose compression. If it's a small chunk of fin, it might not have much of an affect at all.

If it were me and I could return it, it's a no brainer. They need to go back.

But on the other hand, if I needed to get an engine running and I had a small chunk of broken fin on one or two cylinders and I couldn't return them, I wouldn't think twice . . . I'd bolt 'em on so quick that David wouldn't have time to throw any of his old Dasher parts at me! How long will they last? There's really only one way to find out . . . :wink:

71SuperBee · « **Reply #2 on:** March 03, 2006, 06:59:16 AM »

You know zen, I really like the way you think, isn't it weird how these things can be so picky at times? I mean with cold air and fins on the cylinders? Well anyway I need to check the date on the BP8 because like it or not folks LOL here i come.. And hopefully with new shocks anyway....

Ret.Bugtech · « **Reply #3 on:** March 03, 2006, 08:30:53 AM »

Zen, I would know. All I would have to do is ask and see how long it takes you to go Er---uh ---well----uh ----er while trying to scatch your butt and changing the subject to Dasher parts. You can't lie very well.
Travis, If these are the clylinders for your van, send them back. They run hot enough without any help. Zen pretty well covered the subject.

Jason · « **Reply #4 on:** March 03, 2006, 02:48:20 PM »

Zen is a pretty Fart Smeller OOPS!!!! I meant Zen is a pretty smart feller. :lol: :lol: :lol: :lol: :lol:

71SuperBee · « **Reply #5 on:** March 03, 2006, 10:42:42 PM »

I know this is a change in the subject but Zen don't you work for Synthetic Industries? "Shaw now" If so I was thinkin about joining you up in there, I have a chance to take a day time 3 day a week job driving a truck there, I would like to work there because this would be new for me. Let me know man. I may be up there with Ol SMELLY....

Zen · « **Reply #6 on:** March 03, 2006, 11:29:10 PM »

Quote from: "71SuperBee"

I know this is a change in the subject but Zen don't you work for Synthetic Industries? "Shaw now"

Yep, I work at Shaw - Plant SI . . . formerly SI Corporation, formerly Synthetic Industries. Started there when minimum wage was $2.65 . . . and Jimmy Carter was president. Other than those few misguided years as SI Corporation, it's been a pretty good place to work.

Back to the broken fins . . . I've been known to pull beat-up, worn out cylinders out of the trash, hone them, slap new rings in worn out, scarred up pistons and use them on an engine with a practically new bottom end. I've got one that I built over 10 years ago still running in Joy's convertible. It's got to be pushing at least 100,000 miles. It still runs. It still runs good. When it gets warm it bearly has enough compression to start! It's a 1600, but I bet a good 1200 would run circles around it.

I somehow let David talk me into staying away from the toy department at Wally World for a couple of weeks and using the money I saved for a new set of pistons and cylinders the last time I built an engine for Homer. Now I won't say I'll "never" build another engine with used pistons and cylinders again . . . but if I do, it will be out of desperation.

It's not that warped cylinders (which is what ones with broken fins are going to become) don't work . . . it's that they don't work long, OR if they do work long, they don't work well. :wink:

71SuperBee · « **Reply #7 on:** March 04, 2006, 09:46:39 AM »

Well Zen, we may become a team up there. I was thinkin about it but 30 miles one way. wow. Plus I would miss BP8 that wouldn't be good. I have missed it enough.... Well acutally last year I tried to come but was too tired...

O I see how ya are zen build a engine for the "wife" out of used old parts and save the new stuff for homer, that is mean, BAD Zen very bad ZEn....Ol homer probley has a stroker engine in it by now and that poor old Joy has a worn out set of jugs on hers.. LOL....

Gobusgo · « **Reply #8 on:** March 04, 2006, 11:15:50 AM »

I wasn't going to use the ones with broken fins, just wanted some backup if the seller said something like, "Well, you can still use them, can't you?"

Got an email from him today. He said to send the broken ones back and he will send some good new ones. Am I mistaken that these are made as a set? If you mix and match ones from a different production "run", won't they be different? On the other hand, I looked at these compared to the ones I got from Joe and all the numbers were the same...production date code, weight code, etc.

Ret.Bugtech · « **Reply #9 on:** March 04, 2006, 02:24:13 PM »

Travis , More than likely they will be the same on the type-4. We had to keep a eye on the type-1 if you were swapping pistons to different clys. The normal piston size on a 1600 was 85.45 mm,but I have seen 85.47-48-49. You might run into a "running" problem if you try to cram a 85.49 into a cly. that has been "lapped' for a 85.45mm. A lot of these odd sizes were due to the different brands. This the main reason I refuse to mix them. I would let your man know what the size of the piston you have just in case. Its marked on top of the piston. There are no markings on the cly. so you don't know what size you have unless you have a inside mic. to measure it by.

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Topic: Broken fins on cylinders (Read 4037 times)

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Broken fins on cylinders

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Broken fins on cylinders

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Broken fins on cylinders

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Broken fins on cylinders

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Broken fins on cylinders

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Broken fins on cylinders

Zen

Broken fins on cylinders

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Broken fins on cylinders

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Broken fins on cylinders

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