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Old 01-18-2009, 06:23 AM   #1
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Default What happened to my engine?

I was practicing at the track yesterday with my Mugen MBX5. The engine is an RB Concepts C5. The ambient temp was ~60f, the C5 was running ~210f consistently. I've taken very good care of that engine. I've always run it a little on the rich side. It seems to have good pinch.

It died on the track after several runs. Until that point, it was running fine, no signs of anything gone wrong. I started it up again and it slowly died. I let the engine cool for 30 minutes. I removed the glow plug and hooked it up to my igniter, it glowed like it should. I replaced it anyway. I started it again, it died slowly.

Does that symptom point to anything?

Many thanks.
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Old 01-18-2009, 06:26 AM   #2
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Check your pressure hose, I may have a pin hole in, reducing tank pressure.
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Old 01-18-2009, 02:47 PM   #3
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What you are describing sounds like a loss of fuel pressure. A sure sign is if you answer yes to either of these questions
1. the engine runs stong on a full tank; but once you reach a 1/2 tank or less, the engine runs irratic.
2. the engine will run for all/most of a tank, but the longer you run, the less you can squeeze the throttle before the engine cuts out.

Some suggested causes to check:
1. crack or leak in the tank. Check for leaks frm the lid or cracks near the hose connections or screw mounts.
2. Clogged up fuel filter. Clean & or replace fuel filter.
3. Loose back plate screws (front plate if you're engine is so designed)
4. cracked/obstructed pressure nipple on the pipe (common on heavily used pipes)
5. least likely.. a block which is beginning to crack. When the block becomes hot, the crack opens enough to cause a leak and irratic running.

Just start at the top of the list and work through all of the plausable causes.

hope this helps.
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Old 01-18-2009, 02:53 PM   #4
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i would say you have a leak...
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Old 01-18-2009, 04:18 PM   #5
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I went to the track shortly after I saw fast11970's reply. I replaced fuel tubing, but that didn't fix the problem. I was glad to replace it though, because I put some clear tubing on so I could actually see the fuel from now on.

My buddy removed the air filter and y'all may not believe this... but we found part of a shock boot in the carburetor. WTF, lol. No idea how or when it got in there. I suppose I'm lucky that it didn't get further into the engine.

Now it's running fine again .
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