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[chris.p]

Originally Posted by MLC Racing

So would it be ok to advance the ignition timing on my 620 by a fixed amount but not by means of a FIM thingy?

My understanding was that any messing with the ignition timing was against the rules, (I'm ashamed to admit that I haven't actually read the latest version).

To save you looking, but you should really read the rules.

Class A

1.6.31 Ignition/Engine Control System

Ignition/engine control system (ECU) may be modified or changed. Any alteration that allows the number of degrees of spark advance beyond the manufacturers standard specification is not allowed.

The use of flash memory (‘flash RAM’) for fuel injection mapping is allowed. An additional control unit to change the fuel mixture may be fitted.


Chris

[MLC Racing]

Class A

1.6.31 Ignition/Engine Control System

Ignition/engine control system (ECU) may be modified or changed. Any alteration that allows the number of degrees of spark advance beyond the manufacturers standard specification is not allowed.


So does this mean physically altering the original engine parts is a no-no?


The use of flash memory (‘flash RAM’) for fuel injection mapping is allowed. An additional control unit to change the fuel mixture may be fitted.



FIM ignition maps are ok?
As are devices to alter fuel mapping?

[skidlids]

My understanding of the rules that have been in place for some time with regards ignition timing is that it should remain standard, obviously anyone using an FIM 59U ECU could alter it easily enough and if protested may well get away with it if the equipment isn't available for checking it,

But with the AL-9000 units which I assume alter the advance over standard as they are advetised as variable advance units for improved output at low or High RPM depending on which ones are used (DP part numbers 965017AAA /96501699C also 09098/09099/09117)

http://www.visi.com/~moperfserv/ignition.htm

I would have thought anybody using them would be leaving themselves open to a £50 protest under rule 1.6.31 that as Chris points out uses the phrase.


Any alteration that allows the number of degrees of spark advance beyond the manufacturers standard specification is not allowed.

Also makes you wonder what else may have been done to an engine if these units need to be used

Out of the 2 class B bikes from Oxford I know for a fact that they are both run standard units one of which was good enough for 1m 50s laps at Cadwell

[MLC Racing]

My understanding of the rule was that ANY alteration to the ignition timing was NOT allowed, hence the use of the phrase
'Any alteration that allows the number of degrees of spark advance beyond the manufacturers standard specification is not allowed'.
I'm obviously not a qualified engine tuner but what would be the point of altering something if the rules state they should stay standard.?
Surely that means standard to the original machine spec and not ANY Ducati.!

Wouldn't advancing the ignition timing mean high octane fuels or additives and other things that are against the spirit as well as DD rules?

[NBs996]

But what is the standard specification?
Is it a fixed number, or is there a +/- that you can work between?

[skidlids]

Originally Posted by NBs996

But what is the standard specification?
Is it a fixed number, or is there a +/- that you can work between?

.The variance/tolerance of electronic ignition is normally quoted as plus or minus revs at a fixed number of degrees of adavnce.

On a 900 (haven't got my 600 manual to hand)
@1700 revs + or - 200rpm the advance is 6 degrees
from 1700 to 2600 rpm + or - 300rpm the ignition timing advances progressively to 32 degrees and can be checked with a strobe against the timing marks on the flywheel

[Ghost]

Originally Posted by skidlids

.The variance/tolerance of electronic ignition is normally quoted as plus or minus revs at a fixed number of degrees of adavnce.

On a 900 (haven't got my 600 manual to hand)
@1700 revs + or - 200rpm the advance is 6 degrees
from 1700 to 2600 rpm + or - 300rpm the ignition timing advances progressively to 32 degrees and can be checked with a strobe against the timing marks on the flywheel

So whats all the fuss, if anything is strobed and reads in the region of 32/34 degrees of advance. thats ok.

Going over that you need some good fuel to prevent detonation.
Look at the bikes no one is streets ahead so lets just get real.

We have had the humped pistons and big valve heads. We need something really radical now in the same guise as a normal motor.