Ignition timing

If the timing is drastically retarded, the engine will run hot - even to the extent of the exhaust pipes glowing red. Power output out is reduced and fuel consumption increased. However, it has to be really drastic for that to happen. Over advanced ignition produces detonation which will destroy pistons. I have my Atlas (fitted with Commando pistons) timed to 28 degrees btdc. It seems perfectly happy.

Superunleaded fuels are available ranging from 97-99 octane; Tesco's Momentum 99 being good fuel, by all accounts, although your fuel system will need to be fully ethanol-proof..... It is often used by club racers. Alternatively, or even in conjuction with, one can use octane boosters.

Ian

Several opinions have suggested setting the ignition timing to 28' btdc, due to the lower octane rating of modern fuels. What are the effects of retarding the timing on the engine? Ie can retarded timing do any damage? My bike is a '71, using a Boyer Mark 3,

cheers

Ernie

Hello for a kick off a Norton 1971 !!! what .? do you mean a Commando if so your on the wrong page you should on the page marked, Commando And Not Heavy twins , this page is for Model 7 to Atlas , sorry for having to write this .

Previously anna jeannette Dixon wrote:

Previously ernie_olivo wrote:

Several opinions have suggested setting the ignition timing to 28' btdc, due to the lower octane rating of modern fuels. What are the effects of retarding the timing on the engine? Ie can retarded timing do any damage? My bike is a '71, using a Boyer Mark 3,

cheers

Ernie

Hello for a kick off a Norton 1971 !!! what .? do you mean a Commando if so your on the wrong page you should on the page marked, Commando And Not Heavy twins , this page is for Model 7 to Atlas , sorry for having to write this .

Surely the forum manager can jump in and move the thread/conversation to the right place to keep things tidy and logical.

JS