advance on cng and retard on petrol

[zackpuse]

hi all,
i have big problem when setting my gasitaly f1 cng to my 4g92 engine.
first situation on petrol i setting 9 degree btdc my engine give me a good performance.
2nd situation on cng i need to set 12 degree btdc for good performance. but my engine knocking when on petrol.
my setting cng 700 rpm n below running petrol, after 4200rpm run petrol for overtaking.
now i setting 11 degree on cng engine running good but still have problem when have cool weather, on petrol knocking when high rpm.
any suggestion to fix this problem
thanks

[Gilbertd]

http://www.aeb.it/products/timing-advance-processors

[zackpuse]

http://www.aeb.it/products/timing-advance-processors

thanks for that info. but i already ask their technical asst and result no timing advance processors suitable for my engine
any other solution
regard

[classicswede]

How have you been adjusting the timing?

[zackpuse]

How have you been adjusting the timing?

adjust the distributor refer on timing light to set btdc. just a normal method to basic timing on efi system

[classicswede]

If it has a distributor then it should be possible to use a advance processor.

[zackpuse]

http://www.autogasitalia.it/db/prodotto ... ng&id=1778

how much cost and where i can by this timing advance processor..