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High RPM missing on FB

Old 08-27-03, 07:47 AM
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High RPM missing on FB

I was running my Spec-7 at the Lowe's motor speedway road course this weekend, and I had problem with the engine missing really badly at high rpm in 4th.

At first I was running about 1/2 tank of gas, and I had momentary (1-2 second) power loss at about 5800 RPM when coming out of the high banking in turn 2, then no problem anywhere else on the track. I would see about 7000-7500 RPM in 4th sustained on the oval section.

Next, I ran with 3/4 tank and had no problems.

In my race, I started with a little more than 3/4 tank - no problems for 4 laps, then horrible problems starting at same part of track but never recovering. The engine would not rev past 6000 in fourth - period. No problems reving to 7500 in third in the infield section.

Seems like a fuel delivery problem, right? Any idea what would come on so suddenly? I'm running a facet pump with no regulator. Had zero problems at Nelson Ledges with this setup. I did notice that the tank was much more pressurized after a run with the higher fuel level.

Any help would be greatly appreciated.
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Old 08-27-03, 11:11 AM
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Maybe the banking let some crud in the tank collect near the fuel pickup? You said it got worse and then worse and never recovered? Sounds like a progressive failure type of thing. Your sock at the pickup may have junk blocking it now.
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Old 08-28-03, 07:32 AM
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Thanks for the suggestion, I was hoping not to have to drop the tank as a first step.

I'm not really sure that the two problems are related. The first problem I had seemed to be lack of fuel due to cornering which basically went away with higher fuel level. The top speed problem came on suddenly after 4 laps and then stayed - still could very well be the pickup.

I was wondering if it is normal for the tank to get pressurized, and if this has any benefit or drawback.
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