1LikesArgus USA Engines Thread
08-18-2011 | 01:15 PM
#856
So I changed the front bearing and no more problems now. Needles are where they are supposed to and engine idles great and can run continually for the full tank. With an EFRA 2081 I am getting great power thought-out and 11 min out of a truggy tank.
I do have a question though. My engine is a modified Argus so does that mean that it will go through bearings faster because of the modifications on the crank shaft? What I mean by that is that since material is removed from the crank it causes the engine to be dynamically unbalanced thus creating more vibrations. You should also know that the crank is off my 1/1000ths at the tip which makes it 2/1000ths all the way around, I wonder if that has something to do with it.
Let me know your thoughts on this one please.
I do have a question though. My engine is a modified Argus so does that mean that it will go through bearings faster because of the modifications on the crank shaft? What I mean by that is that since material is removed from the crank it causes the engine to be dynamically unbalanced thus creating more vibrations. You should also know that the crank is off my 1/1000ths at the tip which makes it 2/1000ths all the way around, I wonder if that has something to do with it.
Let me know your thoughts on this one please.
So, it all depends on where and how much weight was removed from the crankshaft.
A lot of engines have a small amoount of variance from end to end on the crankshafts I have seen. From any different manufacturers. So a small amount I would not worry about.
Lance
RcRenew
08-18-2011 | 05:47 PM
#857
Tech Addict
Joined: Aug 2008
Posts: 589
From: Bakersfield ,CA
same thing with me im fine for a coupe of tanks then 5 to 6mins of racing flame out.Its happen to me with two different 97t.Im changing brands
08-19-2011 | 01:48 AM
#858
Tech Addict
Joined: Feb 2008
Posts: 712
MMM i've been running the 97t from the start have put about 8 litres through both my motors and not had a problem idle nice and steady and everything strange???????
08-19-2011 | 07:09 AM
#859
Tech Initiate
Joined: Jun 2011
Posts: 29
Interesting about the plug comment.
Before my issues with the engine (replacing the front bearing) I run the O’Donnell, but now I'm running the OS P3 super hot plug and it works great with super low idle.
I remember reading something like once you go with OS plugs you cannot go back to O’Donnell, or Dynamite plugs. Something to do with the OS having bigger thread than the other plugs so it ends up stretching-out the cylinder threads causing it to compression leak? Is that a fact or an opinion?
Before my issues with the engine (replacing the front bearing) I run the O’Donnell, but now I'm running the OS P3 super hot plug and it works great with super low idle.
I remember reading something like once you go with OS plugs you cannot go back to O’Donnell, or Dynamite plugs. Something to do with the OS having bigger thread than the other plugs so it ends up stretching-out the cylinder threads causing it to compression leak? Is that a fact or an opinion?
08-19-2011 | 01:13 PM
#860
Interesting about the plug comment.
Before my issues with the engine (replacing the front bearing) I run the O’Donnell, but now I'm running the OS P3 super hot plug and it works great with super low idle.
I remember reading something like once you go with OS plugs you cannot go back to O’Donnell, or Dynamite plugs. Something to do with the OS having bigger thread than the other plugs so it ends up stretching-out the cylinder threads causing it to compression leak? Is that a fact or an opinion?
Before my issues with the engine (replacing the front bearing) I run the O’Donnell, but now I'm running the OS P3 super hot plug and it works great with super low idle.
I remember reading something like once you go with OS plugs you cannot go back to O’Donnell, or Dynamite plugs. Something to do with the OS having bigger thread than the other plugs so it ends up stretching-out the cylinder threads causing it to compression leak? Is that a fact or an opinion?
08-21-2011 | 02:51 PM
#861
Anybody run a 14/50 gear mesh instead of the 13/50 setup in a Losi with the A52 ? I love the bottom and mid in this thing just trying to get some more top. If it means I sacrafice a little bottom to get the top thats fine as these have plenty of bottom anyway.
08-21-2011 | 05:36 PM
#862
IN buggy i run 14/48. Truggy i think 13/48 would be better then 14/50.
08-21-2011 | 07:43 PM
#863
A buggy that gearing sound s fine. Thats a 3.42 ratio lots of top and very little bottom. Thats what you need in buggy. I run on a fairly large track for summer racing. I need some top at the end of the straights which the Argus seems to lack. It has plenty of bottom. Running a 13/48 would be a 3.69 ratio not as much bottom and probably still not the top I want to see at the end of the straight. The 14/50 would be a 3.57 ratio which would seem to suit my driving style the best i have a heavy finger. I would lose some wheel spin coming out of the turn, have more top at the end of the straight and the added benefit of better run times.
08-26-2011 | 06:26 AM
#867
myself i found the 2058 to be the best....But that is on my own modified version....On the ground I like the 2081 better then the 3033 .....it has more snap on the trigger....
08-26-2011 | 01:12 PM
#868
Tech Addict
Joined: Aug 2003
Posts: 526
From: PA
Hey Neal are you saying that's a "tuned" run for the stock engine? The power dips usually means the engine is still rich on the mixture when it's wavy like that with good peak power. When tuned you should be able to smooth the curve out with less peak power. Can you show us the cylinder temps or EGT with each run? The big drop at 28,000rpm usually happens with a spun rod bushing; bad bearing, piston and sleeve seize, or even from being rich and causing vibration. If you graph the temp with the rpm curve you can see what the cylinder temps are doing at those points.
08-26-2011 | 01:40 PM
#869
Hey Neal are you saying that's a "tuned" run for the stock engine? The power dips usually means the engine is still rich on the mixture when it's wavy like that with good peak power. When tuned you should be able to smooth the curve out with less peak power. Can you show us the cylinder temps or EGT with each run? The big drop at 28,000rpm usually happens with a spun rod bushing; bad bearing, piston and sleeve seize, or even from being rich and causing vibration. If you graph the temp with the rpm curve you can see what the cylinder temps are doing at those points.
