The New Werks B5 .21 Racing Engine
#1486
#1487
Tech Fanatic
iTrader: (2)
Joined: Jul 2008
Posts: 786
I'm now a believer on the importance of a carb reducer. I was able to use an 8mm insert from an old engine for today's race. I had expected to lean the needles considering it was 10deg warmer and with less airflow. I ended up richening the HSN 18 hours! Ron was right on with the increased turbulence without an insert.
#1491
Tech Initiate
iTrader: (1)
Joined: Oct 2009
Posts: 22
Have had the engine for 5.5 gallons now. My friend and me have the same engine. We love this engine... I've gotton off tune a little. The engine would idle then the idle sound would drop. Then the engine would die. I had the idle gap to wide. So I went back to stock settings with the needles (flush). Closed the idle gap to just smaller than a credit card size.
It was hard for me to get the temp up to around 200F. Even after driving around for around 5-10min. Temp was around 130F-150F.
So I started to lean the bottom one hour at a time. Until I could get a steady idle. Then the engine would die...
So here is my question: Should I still lean the bottom or start leaning the high? Is this a tale tale sign the engine is going bad?
Thanks
It was hard for me to get the temp up to around 200F. Even after driving around for around 5-10min. Temp was around 130F-150F.
So I started to lean the bottom one hour at a time. Until I could get a steady idle. Then the engine would die...
So here is my question: Should I still lean the bottom or start leaning the high? Is this a tale tale sign the engine is going bad?
Thanks
Take a look at the "tuning bible" stickied at the top of the nitro offroad forum. It provides good info on, among other things, this problem (and always make sure the engine has reached working temps before tuning (if working temps are hard to reach, lean the HSN a bit)
Jacob
#1492
Tech Master
iTrader: (50)
Joined: Feb 2006
Posts: 1,298
From: Michigan, USA
Assuming you fuel tank and fuel line have no air leaks.
Set you idle gap to the credit card size. .7 or so.
With both needles starting at flush, put the car on the track and adjust the HS needle to get the top end you want. Once you get this set the LS for consistent idle. This will get you very close.
Hope that helps you.
Set you idle gap to the credit card size. .7 or so.
With both needles starting at flush, put the car on the track and adjust the HS needle to get the top end you want. Once you get this set the LS for consistent idle. This will get you very close.
Hope that helps you.
#1493
Have had the engine for 5.5 gallons now. My friend and me have the same engine. We love this engine... I've gotton off tune a little. The engine would idle then the idle sound would drop. Then the engine would die. I had the idle gap to wide. So I went back to stock settings with the needles (flush). Closed the idle gap to just smaller than a credit card size.
It was hard for me to get the temp up to around 200F. Even after driving around for around 5-10min. Temp was around 130F-150F.
So I started to lean the bottom one hour at a time. Until I could get a steady idle. Then the engine would die...
So here is my question: Should I still lean the bottom or start leaning the high? Is this a tale tale sign the engine is going bad?
Thanks
It was hard for me to get the temp up to around 200F. Even after driving around for around 5-10min. Temp was around 130F-150F.
So I started to lean the bottom one hour at a time. Until I could get a steady idle. Then the engine would die...
So here is my question: Should I still lean the bottom or start leaning the high? Is this a tale tale sign the engine is going bad?
Thanks
At 5.5 gallons I doubt your engine is spent unless it's been abused for it's whole life. So I'm going to assume that you haven't abused it and it is still in decent condition.
Setting your idle gap at a cc size is the way to go, which you did. However, at 5.5 gallons a flush setting is probably too rich all the way around which you found out because you couldn't get temps up even after driving around for a bit. If you've adjusted the low to the point where you could get a steady idle how long was it steady before cutting off? I would get the engine fired up at whatever low needle setting your at, start driving it to heat saturate the block and chassis, then take a temp reading. If you're still in the 150 F range, start leaning the top 1-2 hrs at a time. During this time do whatever is needed with the throttle to keep the engine running (blip the throttle before it reaches the point where it'd die). With leaning the HSN you are leaning the total amount of fuel available so by default are continuing to lean the fuel at idle or on the lsn. At some point with leaning the HSN, your temps will start to rise. If when getting your temps up with the HSN your idle also starts to rise, then you know you've gotten to a point where there isn't enough fuel being delivered on the LSN and you'd begin to richen the LSN. If you don't ever cause the idle to rise by leaning the HSN and you have a good idle that doesn't die, your done. Or if the idle doesn't hold and the engine does die, lean your LSN some more until you achieve a steady idle that holds.
During this excercise always be sure you're seeing smoke at the exhaust throughout the entire rpm range and have some oil residue on your body and left rear tire. If you've done all of this and still can't get a steady idle, replace your glow plug w/ a brand new one (may actual want to do this first to eliminate the possibility of a bad plug). If the plug is good, start checking for air leaks in your fuel delivery system (tank, fuel lines, exhaust, couplers). If they're all good check for leaks around the carb base, backplate, cooling head and front bearing. Do a soap bubble test...spray a small amount of soapy water/windex to see if bubbles are made, if so, there's an air leak.
I'd also compare w/ my buddy, run the same fuel, being at the same place so atmoshpheric conditions are the same and see where his needles are as a reference.
Fuel, air, and ignition is all it takes for an engine to run. Adjusting needles is adjusting the fuel/air ratio and your glow plug is the ignition. Once you initially apply voltage to it to cause it to glow, the ensuing combustion w/in the chamber keeps it hot enough to continue to provide the spark needed for continued combustion. Air leaks are gremlins which play with your fuel/air mixture and bad fuel is just that...bad.
Good luck, let us know how you make out.
#1494
TT will have a wholesale account with Werks, and be offering all Werks products directly. I can not post pricing, but I can tell you we will always be about 10% less than any other retail outlet
#1496
Joined: Mar 2007
Posts: 8,692
#1497
#1498
#1499
OK I am planning out my Losi 8ight 2.0 buggy and this seems to be the engine to go with. I see that there is an updated carb design, but amainhobbies doesn't have it in stock. Does anyone have any advice on where to pick it up?
Also from going through the thread it seems that the Orion 2013 is best all around pipe to run with this. Is that correct?
One final question. I think I may be building a Truggy in the future as well, is this a competitive Truggy motor? I figure it would be way simpler if I could run the same motor in both rigs so I can become a real expert on it.
Thanks for any advice!
Also from going through the thread it seems that the Orion 2013 is best all around pipe to run with this. Is that correct?
One final question. I think I may be building a Truggy in the future as well, is this a competitive Truggy motor? I figure it would be way simpler if I could run the same motor in both rigs so I can become a real expert on it.
Thanks for any advice!
#1500
running the stock (13t) bell in my 8T 2.0..."PROBLEM" is that with the B5 having SOOOOO much bottom end, anyone try it with a 15t bell...??? is the 2-tooth bell change to much for the B5's bottom end..??



63Likes
out of your pipe choices, in my opinion the Jp3 or 2060 will work best, Jp3 will have most power out of your choices, 2060 a bit smoother.......