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| Large Engines Discuss Engines Used on Giant Scale Aircraft. Gas/Glow, as long as they're big! |
Topic Review (Newest First)
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| 03-20-2014 02:03 AM | ||
| Philip Shaw |
Re: How badly is this 3W damaged? I have built and raced big block chevs for yrs , 90 mph go carts and GXRs there is nooooo way i would be running your motor with damage like that , the ring gland will be the first to go and and stick the ring , power out and probly smoke your plane into the ground. Its really to bad that the seller and the buyer could not come up with a happy middle , half and half on the bill , some of the guys i have bought from on rc canada will pull the motor down and take pics of all the internals before i will agree to buy , sadly to say dont trust any one on a used motor unless you go to there home or place of biss or if it has been sent to DA or another manufacture or 3w etc with a clean bill of health , really sorry to about your grief puts a bad taste in the hobby |
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| 03-19-2014 10:55 PM | ||
| MikeCam |
Re: How badly is this 3W damaged? Quote:
I would hazard a guess it might even go up a tad more once the rings get fully seated. Best way to do that is short full throttle runs like when testing props. 
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| 03-19-2014 03:37 PM | ||
| bradleyban |
Re: How badly is this 3W damaged? Quote:
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| 03-19-2014 03:34 PM | ||
| marksextra |
Re: How badly is this 3W damaged? Just a quick update to this thread. I was finally able to test the freshened motor against the test I did prior to sending it to AI and the results seem pretty good. I realize that rpm numbers when used to determine engine power for our usage are not always the best, but when using them as a baseline to see how the engine performs from prop to prop or to check for power loss due to damage; it seems that rpm may be better suited. If you'll remember, the 2nd expert said I should see less than 200 rpm loss because of the scored cylinder damaged. Originally I tested 3 props(Mej 32x10, Mej 32x10L, and Falcon 32x10) and 4 sets of canister mufflers. (3W L80, L90, Mtw 110k, BMBs) The best rpm I could get with the damaged engine was with the Falcon 32x10 on the MTW110K. I averaged around 5700rpm's but honestly, all the combos were close. Today I ran up the refreshed motor and tried the combos again. Today the best I got was with the Falcon 32x10 on the MTW td110K; it turned 6720! The Mej on the 32x10 ran up to 6450! I'm pleased. That's 1000rpm difference. I suppose someone could argue it was due to something other than the repaired cylinder. I would like to hear some of your opinions. |
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| 03-17-2014 05:57 PM | ||
| marksextra |
Re: How badly is this 3W damaged? Quote:
I mean, IF I had just one more picture of the engine when it was in the sellers possession showing the bolt marks on either cylinder then I could prove that the seller had taken off the cylinders before selling it. But in the end, if you know I took pictures of the cylinders hours after I received it that show the marks but think I made the marks but covered them up; then not much is going to make you a believer. If you don't believe; then you don't believe. Regarding the lawn mower: That's how I feel too. Much less in a $5000 airplane funded with disposable income. Thank you for the input |
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| 03-17-2014 05:53 PM | ||
| marksextra |
Re: How badly is this 3W damaged? Guys. I don't think you can fully understand how much all of your posts mean to me. Thank you so much. I wasn't starting to think I was crazy but it was maddening to hear that a group of guys was trying to cover this whole thing up and point the finger at me. I seriously documented everything I could about this motor from day one.(literally) I took pictures within hours of getting it and posted them online. To have the sellers friends conclude that I must have taken the cylinders off; ignored the scoring; just to cover up the inconsequential detail that I took off my own cylinders is almost incomprehensible to me. All the while they won't even consider that the seller took the cylinder off; saw the damage; and decided to sell the motor like that without disclosing it. I was stunned. Not because they didn't agree with me; but because they wouldn't follow logic with the evidence provided. I'm glad you all came to the same conclusion as me. Gerhard was right. The damage is sufficient enough to warrant replacement. With all this drama and bad memories; I have decided to sell this motor. I'm taking offers. I've got 1700 into it but all offers will be considered. |
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| 03-14-2014 02:14 PM | ||
| Old School Flyer |
Re: How badly is this 3W damaged? Quote:
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| 03-14-2014 12:18 PM | ||
| MikeCam |
Re: How badly is this 3W damaged? Mark you made the right decision to replace the cylinder. The 2 biggest factors I picked out in this whole thread is, " less then 40 flights" and the scoring on that cylinder. I would never just run an engine with scoring that bad, not even in my lawnmower.
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| 03-11-2014 03:51 PM | ||
| marksextra |
Re: How badly is this 3W damaged? So everyone on this thread says to replace the cylinder; it's damaged. Everyone on the other thread says it's not damaged and fly it 'as is'. Great. Well, I do really appreciate all the replies. I'm going to do as suggested here. It's common sense to me to ensure I do the best I can for my new 40% composite. Why fly a damaged cylinder? If the 2nd so-called expert was the guy that was fixin' 3W's for people that might be different; but he's a nobody. He's not the one that will provide me parts and do the repair if something goes wrong. I think it's wise to give AI the benefit of the doubt. He's the 3W rep, repair shop, and parts supplier. No need to isolate myself from his advice and services. |
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| 03-10-2014 04:29 PM | ||
| marksextra |
Re: How badly is this 3W damaged? Quote:
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