RE: New (to me) internet myth
Unfortunately I have a few more than I need too, that just means I have more to experiment with porting on:), Next I am going to make a pop-up piston and see how that works out. Messing with chainsaws is pretty addicting too.
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RE: New (to me) internet myth
+1
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RE: New (to me) internet myth
ORIGINAL: aussiesteve I didn't have a need to mention the final measurement / acceptance because I was referring to how the majority (by numbers sold) of RC engines are made (In china mostly). - there they set up for an approximate size, then use pretty much everythign that comes off the line. A REAL cylinder is made slightly differently. Casting Rough Machining Finish Machining (with a different cutting tool to what was used in the Rough Machining) Inspection for acceptance / rejection Plating / Coating (Either Electro-plating of multiple metallic layers with a Chrome alloy as the final run - or with a Silicon Alloying coating such as Nikasil) Inspection for acceptance / rejection Final Grinding to size Finish Honing with fixed hone tooling Final measurement Acceptance or rejection Grading. Pe - the beauty of such manufacturers as MVVS is that the product is consistently great from one engine to the next - it took me a while to really ''get'' that but once it is experienced, it sure is a nice thing. |
RE: New (to me) internet myth
I believe the pinking of the cylinders happens when the solvents used are exposed to high temperatures
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RE: New (to me) internet myth
ORIGINAL: Truckracer ORIGINAL: blikseme300 Off to go make some popcorn and grab a soda. Be right back as this is going to be interesting.:D Bliksem Good information to be had from the people here that know their business. I might not be a youngster but I appreciate any information about the things we use in our obsession. Live and learn. Bliksem |
RE: New (to me) internet myth
Chain saws = work
But I do love my Lil Husky though:D |
RE: New (to me) internet myth
ORIGINAL: blikseme300 ORIGINAL: Truckracer ORIGINAL: blikseme300 Off to go make some popcorn and grab a soda. Be right back as this is going to be interesting.:D Bliksem Good information to be had from the people here that know their business. I might not be a youngster but I appreciate any information about the things we use in our obsession. Live and learn. Bliksem |
RE: New (to me) internet myth
ORIGINAL: RTK I believe the pinking of the cylinders happens when the solvents used are exposed to high temperatures |
RE: New (to me) internet myth
ORIGINAL: aussiesteve This is because the majority of the engines that are bought nowadays have a very basic manufacturing technique used. Teh cylinders are molded on a mandrel, chemically cleaned, flame plated with Chrome then the final surface finish is achieved with a basic hone unit. That technique results in bores that are neither parallel nor round. They are however cheap to produce that way and they will allow the engine to run. What they do not allow is good ring sealing so power is lost. I'm curious if the DLE bore is indeed machined or just a very good plated as cast example. Can you shed any light on these two examples of cylinders? |
RE: New (to me) internet myth
ORIGINAL: Truckracer ORIGINAL: blikseme300 ORIGINAL: Truckracer ORIGINAL: blikseme300 Off to go make some popcorn and grab a soda. Be right back as this is going to be interesting.:D Bliksem Good information to be had from the people here that know their business. I might not be a youngster but I appreciate any information about the things we use in our obsession. Live and learn. Bliksem No matter the subject, if you post your opinion in a car forum, there will be a 12 year old telling you you're wrong because "so-and-so" says so. I've learned more constructive information in the past year than I learned in the first 14 years of running rc cars. Sorry I was off the subject a bit.. Keep on sharing the good stuff! My brain still has a little room for improvement yet (and I too have a chainsaw or two..). |
RE: New (to me) internet myth
ORIGINAL: Truckracer ORIGINAL: RTK I believe the pinking of the cylinders happens when the solvents used are exposed to high temperatures |
RE: New (to me) internet myth
3-W puts something in the metal on purpose thats turns pink so they can tell if the engine has been abused. They can even tell what the temp was by the shade of pink. Stops a lot arguments about "I didn't do anything wrong". Never heard that DA does the same thing. Dennis
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RE: New (to me) internet myth
ORIGINAL: DadsToysBG 3-W puts something in the metal on purpose thats turns pink so they can tell if the engine has been abused. They can even tell what the temp was by the shade of pink. Stops a lot arguments about ''I didn't do anything wrong''. Never heard that DA does the same thing. Dennis |
RE: New (to me) internet myth
ORIGINAL: dirtybird ORIGINAL: DadsToysBG 3-W puts something in the metal on purpose thats turns pink so they can tell if the engine has been abused. They can even tell what the temp was by the shade of pink. Stops a lot arguments about ''I didn't do anything wrong''. Never heard that DA does the same thing. Dennis |
RE: New (to me) internet myth
ORIGINAL: Truckracer ORIGINAL: dirtybird ORIGINAL: DadsToysBG 3-W puts something in the metal on purpose thats turns pink so they can tell if the engine has been abused. They can even tell what the temp was by the shade of pink. Stops a lot arguments about ''I didn't do anything wrong''. Never heard that DA does the same thing. Dennis INTERESTING....I "cooked" the cylinders on an old 3W 140 two years ago and did not notice any "pinkening" of the cylinders. I have noticed this on DA's though. My 3W was in a Trueworthy Pitts M12. I'm pretty sure my overheating issues were cooling air related. I continued flying the plane as I tried various baffling/exit air combos. Well...before I got things worked out...the engine quit on a flight and after landing the nose of the crankcase and prop hub were still so hot that it was uncomfortable to touch for long. After cooling...the engine would restart but was WAY DOWN on power at mid to high throttle. When I pulled the jugs off...one had an area roughly the size of a quarter in the exhaust port area of the cyl wall that was missing the plating. The other cyl had a few very small spots where it looked like the plating was just starting to go. I learned on RCU that quite a ways back 3W had some issues with poor plating and/or out of round cyclinders. I'm guessing that since my engine was VERY hot...the damage was caused by that and not faulty cylinders. I'll have to find these cyls and look again at the color... On a side note...after the above incident I bought a cheap "laser/infared thermometer" and started checking both my own and others engine temps. I know this method of temp checking on engines that have just returned from a flight is not "usefull" to the engine experts but I was just playing around. I was pleased to find that the temps on my other 3W's was very close to the temps on other guys 3W's that I checked. I was usually getting ~250-280 deg in between the top cooling fins on the cyl. I only have one DA right now. Its a well used "older" 100 and the temp on that eng was ~200 deg taken right after landing. I checked a buddies and got about the same so it looks like DA's run cooler?? I know...not the most accurate method to monitor temp and many variables...cooling air, oil, prop loading... Just found it interesting though. Steve |
RE: New (to me) internet myth
You are right, not be the best way of testing, but it does give you a little insight
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RE: New (to me) internet myth
MVVS> you can sell them used for more that what you paid for them new [X(]
yee-up Jim |
RE: New (to me) internet myth
ORIGINAL: Antique A customer told me today he heard that the A stamped on top of a Sachs piston means top of the line, a D on top means industrial grade...What a CROCK...Maybe we should start a thread with all these internet MYTHS listed for newbies..We ALL know the old timers don't perpetuate these things, don't we ? :eek:;) All of the car manufacturers do this that I am aware of, any number of other industries do this as well, including the printing press manufacturer I used to work for. It is an extremely common SOP. Whatever the Letter scheme denotes on a Sachs piston, I don't know but I am sure it denotes differences in the parts that you can't just look at and see easily. |
RE: New (to me) internet myth
As stated in a previous post by Antique, on a Mahle piston, the "A" or "AB" has to do with the size tolerance
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RE: New (to me) internet myth
ORIGINAL: w8ye As stated in a previous post by Antique, on a Mahle piston, the "A" or "AB" has to do with the size tolerance |
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