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Author Topic:   top end miss
ss38k
Member
posted May 09, 2004 05:50 PM
Okay guys this is weird. Ran first race two weeks ago, and won heat 4th in main. Motor was flawless.Before next race which was 5/8/04 I put new cap rotor wire plugs on motor. Big time top end miss. Changed everything back to old stuff just to see if any of the new stuff was bad. Same thing happend. What it does is once it gets up to 5000 rpm it just flattens out wont go much about 5000 went to 5300 one or two times. The motor is always at 5800 to 6000 every lap. Even last year. I was thinking maybe the coil it was real hot when we put in the other cap at the track after the heat race. Or could be the solenoid I have one on the fire wall before stater so that I dont have to run other wires down past headers. My other though was my fuel pump. What do you all think? It will do this in the pits also run it up to 5000 on the tach and you can watch it drop right down to 4500 like right now and then slowly down to 4000 rmp. I already put a new fuel filter on the motor. At the track please help me. Thank you in advance.


Okie11m
Member
posted May 09, 2004 08:37 PM
This is probably a dumb Q.,but did ya put the ground strap back in the cap. I got in a hurry one night & did that. It will run but it will run out on the top end.


juliaferrell
Member
posted May 09, 2004 09:09 PM
OKie 11M has the fix for you. Fire bouncing all over in there I'm sure.


ss38k
Member
posted May 09, 2004 09:26 PM
yea if you mean the one on the coil yea i did . and tomorrow i will know for sure because i am going to start process of elimanation .just was not sure were to start probably the fuel pump it is last year's.


smallrock98
Member
posted May 09, 2004 10:49 PM
I had the same problem last year. LOL, what is it with that 5 grand flatten out anyway? Engine acted like it was leaning out and not getting any fuel so I changed the fuel pump but didnt fix the problem. I never did figure it out. I put in a totally different engine for this year. But if I was still running that engine my next check would be to see if the cam was getting flat.


dirtbuster
Member
posted May 10, 2004 09:50 AM
Make sure your battery is good. WE had a bad battery once and it would cause a miss at high rpms. At least make sure you are getting full voltage to your ignition.


Dixon
Member
posted May 10, 2004 12:32 PM
Take a look at the carb. Last year I had miss, tried a new fuel pump and distributor, they didn't help. Ended up being the carb. Try a different one you know is working correctly, if it still misses go back to the ignition.


ss38k
Member
posted May 10, 2004 10:15 PM
it is a new cam rock 98 3 race's on it



ss38k
Member
posted May 10, 2004 10:20 PM

hey dirt thanks. i was thinking of taking the battery back and getting a new one.but i also but a full charge on the battery the night before we went to the race. and i do have a good Alt.


way2fast72
Member
posted May 10, 2004 11:44 PM
If this is a HEI ignition? check and be sure you didnt over tighten the screws for the coil,I have seen them produce a small crack in the screw holes and give you fits trying to find it.The fire will miss fire to the screws instead of the terminals.


kurzhaar11
Member
posted May 11, 2004 11:13 AM
Kind of an open ended question......all suggestions thus far are good....I had a blown head gasket between 2 cylinder walls. Idled fine even ran 'ok' at low rpm...go to stand on it, missed and sputtered like crazy. Didn't have any oil in radiator, nor coolant in oil. Check compression.


sdracer82b
Member
posted May 11, 2004 09:00 PM
hei need s good amps and volts so battery can be it and you cant tell by just if it starts your car


driver27
Member
posted May 13, 2004 07:32 AM
check your valve adjustment, bet you got some lobes going flat.


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