usually I got my engine program under control, but lately I had some VERY strange engine problems and I am running out of ideas.
Yesterday at a race, a buddy of mine had exactly the same problem and it's making us nuts.
Here is what happened:
1. Bought an LRP Team spec 3, Picco Evo2 based. Ran the engine at an indoor race in November and all was good. Beginning od May, when out outdoor season started, I strapped the LRP into my MTX4 and it ran problem free for about 5 tanks. All of a sudden, it started bogging out of a hairpin. It just would accelarate anymore. Sounded like it was too lean.
Checked everything, tank, pipe, fuel line. Checked the engine for leaks, nothing.
After it had cooled down, it started back like normal. Put the car on the track and ran for two laps without problems. Then when the engine came up to 85 -90 Celsius, it strated bogging in the same hairpin again. It just would take gas anymore and when you opened the throttle it flamed out.
Back to the pits, changed the tank, the pipe, the fuel line. put a Novarossi carb in it and sealed carb and backplate.
Still, after it reached temp, it bogged.Tried 3 different NR carbs, no change.
Then we thought it might not have enough compression, so we squeezed it slightly. No change. Checked the head clearance: 0.45 mm, as recommended by LRP and that's what everybody is running around here. We are at 500 meters above sea level.
Changed fuel,no change.
Timing of the LRP: crank opens at 30, closes at 65, exhaust 83, transfer 60, boost 57, then crank is modded, the sleeve is stock
2. Got a new Picco Evo. Broke it in, ran it on the track and it has exectly the same symptoms as the LRP Picco. Tried everything as above, with no luck.
crank opens at 30, closes at 65, exhaust 85, transfer 65, boost 57.
3.My buddy is running a NS 12 S5 which is brand new. It ran great for about 2.5 liters of fuel, before it started doing the same crap as my Piccos yesterday.Again, we tried evrything, but couldn't get rid of this phenomenon.
4. I bought a Plus 12-3 ST, which runs like a champ in the same car, with the same fuel, pipe and everything.
Does anybody have an idea what our problem could be, because I am about ready to start throwing engines a far as I can