Question for today.

[GRASSMAN]

Citroen AX. MISS FIRE @ 6000RPM+
will rev to 8500 no prob normally.
Flowed head, skimmed, 3 angle valve seats, high lift cam,
vernier pully, 2 speed g/box locked diff,

High octane fuel.
New coil pack.
New leads.
New plugs.
New dizzy, cap, and rotor arm. (2 makes)
New coil pack.
New signal amplifier.
New fuel pump.
New fuel filter.
0/40 synth oil.
Fuel tank washed out.
B.T.W. running 4 bike carbs.

ANY IDEAS ?????



Racing on Sunday!!!!!!!!!!!!!!!!!!!!!!!! !!!!

[BUSHWHACKER]

Throttle position sensor?
Oxygen sensor?

[GRASSMAN]

Throttle position sensor?
Oxygen sensor?

Not used, no ECU

thanks Gman

[BUSHWHACKER]

Carbs balanced?
Fuel pressure OK?
Missfire underload or all the time?

[GRASSMAN]

Carbs balanced?
Fuel pressure OK?
Missfire underload or all the time?

1 yes.
2 flow required, not pressure.(they flood dead easy)
3 under load @ high revs only.
(usally coming out the of corners).

Thanks mate, any more? please, please please ? (BEGGING NOW)

Gman

[si tate]

A bit off topic mate, but where you racing, anywhere near home.

[Brummie]

Have the carbs got float chambers if so are they sticking also if they are SU type are the oil dampers working properly?

[Jonny77]

Is this something that has just happened or has it always been like it?
I take it the the carbs have been set up on the rollers right up to 8.5k?
Does it actually develop any usable power over 7k? I would be suprised if it did with the engine spec you have listed.
Have you tried a cooler grade spark plug?
What ignition are you using? At that sort of rpm the springs might be bouncing in the dizzy. Likewise with the valve springs.
Is this the 1.4 XU engine? originally a twin Weber?

Failing all else, blame it on being French

[darkdezigns]

sounds lik carbs are flooding on the corners to me check floats for pin holes or dampers as said above

[GRASSMAN]

A bit off topic mate, but where you racing, anywhere near home.

A bit late with my replies, sorry, been in the garage all day
getting the car ready.

Racing at Yorkshire Dales Club near Thornborough, start
at 11.00 am

[GRASSMAN]

Have the carbs got float chambers if so are they sticking also if they are SU type are the oil dampers working properly?

hi mate,
A bit late, but.
Yes, they have float bowls, all clean and free moving
don't need oil it's like a diaphram. Thanks

Gman

[si tate]

A bit late with my replies, sorry, been in the garage all day
getting the car ready.

Racing at Yorkshire Dales Club near Thornborough, start
at 11.00 am

Don't think i'll be going anyway now mate, SHE has made plans for tomorrow now.

[GRASSMAN]

Is this something that has just happened or has it always been like it?
I take it the the carbs have been set up on the rollers right up to 8.5k?
Does it actually develop any usable power over 7k? I would be suprised if it did with the engine spec you have listed.
Have you tried a cooler grade spark plug?
What ignition are you using? At that sort of rpm the springs might be bouncing in the dizzy. Likewise with the valve springs.
Is this the 1.4 XU engine? originally a twin Weber?

Failing all else, blame it on being French

Hi mate,
sorry for late reply,

Pulls all the way up.
Ignition is electronic hall effect type, no rev limiter.
Plugs are two down in temp from standard.
High lift Piper cam and high perfomance valves springs.
No it's a 1100cc TU engine, single carb type.
We do know of a 1.4 TU engine that pulled up to 10200 rpm!!!!

I'll just have keep trying, cheers

Gman

[GRASSMAN]

sounds lik carbs are flooding on the corners to me check floats for pin holes or dampers as said above

Hi mate,
Another late reply, sorry,

checked the diaphrams for holes none found, if they get
holed, it will not tick over properly, floats are OK the carbs
will overflow and dump fuel all over if damaged. Cheers

Gman

[surfenstein]

Is this something that has just happened or has it always been like it?
I take it the the carbs have been set up on the rollers right up to 8.5k?
Does it actually develop any usable power over 7k? I would be suprised if it did with the engine spec you have listed.
Have you tried a cooler grade spark plug?
What ignition are you using? At that sort of rpm the springs might be bouncing in the dizzy. Likewise with the valve springs.
Is this the 1.4 XU engine? originally a twin Weber?

Failing all else, blame it on being French

i would pull the crank sensor out and check it.could be covered in crud.edit forget that just read first post.