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Old 06-28-2011, 11:05 PM   #1
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Default Motor Problems

I have an RB Xenon that I got used with my 1/8 scale. The motor is practically brand new. The pipe I have with it is a Sirio 2013 with a short header. The problem I am having is, the tune is all over place. It will have a lean bog going down the straight, but load up in the low speed areas and come off at 152 degree. Also, I went ahead and sealed the motor. In the past, has anybody had the same problems? Any help would be great.
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Old 06-28-2011, 11:29 PM   #2
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I have an RB Xenon that I got used with my 1/8 scale. The motor is practically brand new. The pipe I have with it is a Sirio 2013 with a short header. The problem I am having is, the tune is all over place. It will have a lean bog going down the straight, but load up in the low speed areas and come off at 152 degree. Also, I went ahead and sealed the motor. In the past, has anybody had the same problems? Any help would be great.
You pretty much answered the question yourself. If you have a lean bog on the straight, richen the top, and if it loads up on the infield, lean the bottom.

Start by richening the top, then dial in the bottom. Keep in mind that these motors are very sinsitive to overheating, if you're lucky yours is still fine. Its a very fast motor though, I used to have one.
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Old 06-29-2011, 12:28 AM   #3
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Bog could also rich or lean condition. How much smoke you emitting. 150 degrees it maybe rich. So lean it a 1/8 turn on your HSN, till it runs evenly. Then turn your LSN slowlyCW. Idle speed may increase, tells its lean condition. Turn LSN CCW till the idle drops. It should take up to 5 seconds for it comes to idle speed.
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Old 06-29-2011, 02:43 AM   #4
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If it is the AAC version you must keep the temp below 105 degrees celcius, a good tune will give about 90~95 degrees C
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Old 06-29-2011, 06:41 PM   #5
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You pretty much answered the question yourself. If you have a lean bog on the straight, richen the top, and if it loads up on the infield, lean the bottom.

Start by richening the top, then dial in the bottom. Keep in mind that these motors are very sinsitive to overheating, if you're lucky yours is still fine. Its a very fast motor though, I used to have one.
I started to richin up the top end about a half of a turn, it helped a little bit. By the end of the day, I had the bottom end turned out 2 and a half turns just to get the car to go half way decently. I would come in for a pit stop and go back out, there was so much smoke coming out, it was ridiculous. I just wasn't sure if this kind of motor had problems with tuning in the past or not. I will keep turning screw until I find the sweet spot.
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Old 06-29-2011, 06:43 PM   #6
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If it is the AAC version you must keep the temp below 105 degrees celcius, a good tune will give about 90~95 degrees C
I thought companies went away from this material a very long time ago?
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Old 06-29-2011, 10:49 PM   #7
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I started to richin up the top end about a half of a turn, it helped a little bit. By the end of the day, I had the bottom end turned out 2 and a half turns just to get the car to go half way decently. I would come in for a pit stop and go back out, there was so much smoke coming out, it was ridiculous. I just wasn't sure if this kind of motor had problems with tuning in the past or not. I will keep turning screw until I find the sweet spot.
Once you git rid of the lean bog, start leaning out the bottom, 1 hour at a time, until you have good smoke, but not too much.
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Old 06-30-2011, 02:14 AM   #8
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I thought companies went away from this material a very long time ago?
The RB Xenon is made by Starmotor (Sirio) and they still do use AAC. The RB comes in 2 version, the Xenon with an ABC construction and the Xenon-R with an AAC construction.
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Old 08-17-2011, 09:15 PM   #9
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Hey everyone, sorry I haven't been on here to keep anyone up to date, but I am still having motor problems with the same issues above. I was going through my motor tonight and was checking the head clearance and I came up with 1.10. Is this right? I thought this was suppose to be .30 of head clearance? Anymore help would be great.
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Old 08-18-2011, 07:17 AM   #10
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Hey everyone, sorry I haven't been on here to keep anyone up to date, but I am still having motor problems with the same issues above. I was going through my motor tonight and was checking the head clearance and I came up with 1.10. Is this right? I thought this was suppose to be .30 of head clearance? Anymore help would be great.
Thinking outside the box, if there is a leak in the tank or lines, then you may be losing fuel pressure hence leaning at top speed.
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Old 08-18-2011, 08:22 AM   #11
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Originally Posted by ChadB. View Post
I have an RB Xenon that I got used with my 1/8 scale. The motor is practically brand new. The pipe I have with it is a Sirio 2013 with a short header. The problem I am having is, the tune is all over place. It will have a lean bog going down the straight, but load up in the low speed areas and come off at 152 degree. Also, I went ahead and sealed the motor. In the past, has anybody had the same problems? Any help would be great.
Seems the LSN is too rich and HSN too lean, try to set the other way around
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Old 08-18-2011, 10:02 AM   #12
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Thinking outside the box, if there is a leak in the tank or lines, then you may be losing fuel pressure hence leaning at top speed.
I recently chased down a wandering tune on an old Nova mounted in an equally old chassis. Ended up being the fuel cap seal which had compressed and is now a "seal" in name only.

OP might also want to try a different plug if he hasn't already. How's the compression on the engine? And is it blowing plugs at all?
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Old 08-18-2011, 03:22 PM   #13
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Thanks for the sugestions. I have had 3 different guys try and tune this thing and everyone has been scratching there head. These people are all expreinced too. I thought it could be the tank, so I went and ordered one with some new fuel line. It should be here tomorrow. Back to the head clearance. Does anyone know what the head clearance should be to run 25 percent fuel? Does anyone know if you have to much clearance, would it effect the tuning? The tune on the engine is different every time I take the car out and I cant get the motor past 180 degrees.
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Old 08-18-2011, 04:02 PM   #14
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Thanks for the sugestions. I have had 3 different guys try and tune this thing and everyone has been scratching there head. These people are all expreinced too. I thought it could be the tank, so I went and ordered one with some new fuel line. It should be here tomorrow. Back to the head clearance. Does anyone know what the head clearance should be to run 25 percent fuel? Does anyone know if you have to much clearance, would it effect the tuning? The tune on the engine is different every time I take the car out and I cant get the motor past 180 degrees.
head clearance is often dependent on the altitude you are running at. Sorry I dont know the specific head clearance at sea level.
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Old 08-21-2011, 12:15 AM   #15
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Richen TOP
Lean BOTTOM
GO TO a HOTTER PLUG
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