160 fx wrist pin

160 fx wrist pin (Full Version)

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John B -> 160 fx wrist pin (12/24/2001 7:46:08 PM)
mine went south....busted the piston rod ruined the liner, parts cost what a new one will. I s ths common ? my first big glow and was wondering if there was a reason for this, I'm positive it was not lean or rich. My 4rth OS and my 3rd piece of junk motor. Have a .28 os thats great, the others ........well. :mad: No more OS for me

Taildrager -> Trashing motors (12/25/2001 6:39:45 AM)
As I have broken more than a few race engines, there is only a few things that can cause a rod to break. Lack of lubrication, too many rpm, a rod bearing seizing, a rist pin breaking or seizing, or a flaw in the casting. Usually a rod will break when it is unloaded, or not in compression. Hydro lock while starting can also bend a rod, which will fail in short time. Is the break new & shiny, or is there a small part of the break darker in color, if so the rod might have had a hairline crack before the final break. When I broke a motor it was usually trying to get the last bit of rpm and power out of it. As I was racing it was just another bullet to be rebuilt bigger and better.

John B -> 160 fx wrist pin (12/25/2001 10:12:15 AM)
did not break the rod broke the pin, this motor was on a 120 supersportster I only had 4 flights on both. She came unglued at about 2/3 throttle on take off. At least i got the plane back. I run it a couple hundred off peak on rich side. I just seem to have bad luck with OS. think I will get a big 4 stroke for it . was runnin a 18/10 so over revving is not a issue I am sure.

SKYPILOT -> broken wrist pin (1/5/2002 11:27:26 PM)
john, 200 off peak on the ground without inflight mixture control is too lean for most fuels, if you were using the sport type fuels that usualy have around 15-18% oil, and set the needle for 200 off peak on the ground, then it was too lean once under way. was there any type of break in process done or was the eng. bolted on, set for 200 off and sent up ? not flaming you here but your post is "a little" vague in discription, completly lacking in a detailed discription and history, including, fuel, prop, breakin, tach, or by ear,etc., and all too offten the failed part is blamed, when it was in fact the user's fault, not saying you, but without all the fact's, who's to say what really happened ? . I have used os engines for years in the most hostle invirement ( ducted fans ) and have never had a part fail, i have seized them, but that was my fault in getting them set perfect ( so i thought ) on the ground only to have them seize seconds or mimiuts into the flight, and that is with special jet fuel that uses 23% oil . I am planing to use a 160 fx in a dynaflite super decathalon, and have spoke with dozens of people running this eng. who could'nt be happier with the 160. your post is the first negitive thing i have ever heard about the 160 fx and it scared me, so i ( we all ) would like to know more imfo. in detail so an imformed opinion could be made ! regards, scott

T28pilot -> Ditto (1/6/2002 1:08:05 AM)
inquireing minds want to know!:p

John B -> Coulda been me..... (1/6/2002 2:20:58 AM)
I was using byron 10% with 20% oil content. I bought the engine from a club member who had went to all 4 strokes or gassers said there was 2 gallons run through it.So, I just fut it on and flew, I could have had it lean but I really doubt it.

Fuelman -> 160 fx wrist pin (1/6/2002 7:43:14 AM)
I had a friend in the club that had the exact same thing happen with his OS 160. He was using 20% total oil (by volume, not Byrons) with an 80/20 blend. His failure occured on the 4th run (brand new motor) His first two runs were 4-stroke rich with third run (first flight) was barley breaking into a two stroke when it unloaded, forth flight same as third and it came apart about a minute into it with an 18x8 prop. Personally I've had problems with many OS engines but my problems disappeared when I started manufacturing a quality fuel with quality oils in adequate amounts. Sorry to hear you had your day ruined with that, I hope you get back in the air again. Fuelman

ShempHoward -> 160 fx wrist pin (1/6/2002 3:12:32 PM)
Send it back to Hobby Services and take advantage of the OS 2 year warranty.

T28pilot -> Good Call Shemp (1/6/2002 8:43:20 PM)
Good Call Shemp.......... Glad one of us is on our toes! :p

downunder-RCU -> 160 fx wrist pin (1/7/2002 11:27:43 AM)
I had the same problem with an ST51..it broke the moment it fired the first time. Fixed under warranty of course but it turned out that a batch of wrist pins had been left to case harden far too long. The case hardening had gone right through the wrist pin making it as brittle as glass.

PilotFrog -> O S wrist pin failure (1/7/2002 9:07:12 PM)
GOOD LUCK There is one problem here that I can see in getting it repaired under waranty. YOU ARE NOT THE ORIGINAL PURCHASER of this engine and cannot make a waranty claim as it is NOT TRANSFERABLE. I have run into a brick wall with O S on previously owned engines. They keep good records of who purchased the engines especially if through mail order from one of their retail outlets. You might have the person you purchased it from make the claim and you should get results that way. PilotFRog

Diablo-RCU -> 160 fx wrist pin (1/8/2002 8:24:40 AM)
Wristpins should never break in any model engine. I'll bet a dollar to a donut it was a fatigue failure. To determine why, it would have to be examined by a professional. Some of the likely causes are improper heat treatment , "dirty" metal, and most likely a sharp notch created during machining. It has nothing to do with the way you ran the motor. If the wristpin is not blue from heat, then it wasn't galled by lack of oil or a lean mixture. Good luck getting them to honor the warranty on a used engine. Get your buddy to send it in for you. Hopefully he kept the receipt.

ShempHoward -> 160 fx wrist pin (1/9/2002 3:48:01 PM)
Just send it back period - with an explanation of what happened. This engine hasn't been out very long and I doubt they will ask you any questions about where it came from or who the original owner was but I would NOT mention that you bought it from a friend as that would be asking for trouble. Maybe there is a growing problem with a defective batch of 160 FX wrist pins and OS might want to nip it in the bud an not have another major black eye fiasco like they had with some peeling liners. I have found Hobby Services more user friendly lately. Try it - and send ALL the parts back.

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