Bottom end dies after 3 mins. What the...???
Car = V1RR
Engine = OS TR(P)
Problem with car losing all bottom end after 3mins. Here's my story of events that lead to this happening, and might include some hints as to the problem. Its a little long i know, and would appreciate any help. Thanks in advance.
PRACTICE (Australia NSW, Eastern Creek – 26th July 2003)
The car started the day off with good all round performance, until of course, the practice laps heated up, and you guess it, another car nudged me, and my car took a tumble about 2 or 3 times, and since then, the problems started. Grrr…From that point on, and for the rest of the day, my car seemed to have an unusually loud whistling type howling noise when the motor was running.
1st 5 min heat (18 laps – 1st place for most of the race, ended up 2nd after 3 last lap)
At the start and during most of the race, the car seemed normal, with good bottom and top end. But after about the 3.5 min. mark, the car lost all bottom end performance, but once 2nd gear kicked in, top end was normal. What the…??? After taking the body off, I noticed the motor’s carburettor came loose, and had half slid out. I pushed it back in, and then retightened the nut (without locktite). I also noticed that the ‘non-screwable’ nipple on the pipe where the back pressure hose for the fuel tank was loose, and perhaps, I’m not sure, letting out a small amount of exhaust.
2nd 5 min heat (0 laps - DNS)
Pre-race practice laps were good, but when the cars were released for the warm up lap, I didn’t even get 10 metres in, since it appeared that the pre-race practice laps again loosened the carburettor nut, and the carburettor was practically out. SO…I pulled the motor off the chassis, locktited and tightened the carburettor collar tightening nut, but noticed the screw that the nut goes onto, was being pulled through it’s ‘housing channel’ (if you know what I mean). What the…??? Don’t think I can do anything about this no...??? I also pulled off the car the 1st and 2nd plastic gears, lubed the one-way bearing on the 1st gear, and also pulled the metal gears off the motor and checked the clutch spring was still tightened and the bearings on the metal gear housing were spinning.
3rd 5 min heat (18 laps – 2nd place)
No pre-race practice laps this time. Again, for most of the race, the car was handling quite well, but towards the end of the 5 min heat, the car lost all bottom end performance.
DNS…couldn’t be bothered getting frustrated towards the end of the race with no bottom end.
If any of you guys know of things I can start and check in addition to what I’ve already tried, any help would be great. Many thanks in advance