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Not sure on the maximum but just adjusted mine from 2 > 9 deg BTDC with great results, doesent surge and nearly stall at start up as it previously did, runs cooler and returns under 13 ltrs per 100 klms on the highway, not sure how much further to go before it starts to ping. Interested to know also.
Sparky
9 degrees BTDC is usually good without pinging.
If you add more take it for a run and give it heaps at lowish revs to make sure it doesn't ping.
Some engines will take up to about 12 or 13 BTDC.
Regards Philip A
I have been running mine at 12 deg for the last 12 months with no pinging. I haven't tried advancing it any further as its running really well. I would say that this was the single biggest improvement i have found in the running of the engine and economy .
Philip
Is it a case of advancing as far as possible for best results IE 10 or 11 if no pinging. Mine certainly runs cooler, when working hard in sand in low range the electric fan would normally cut in after several minutes, with the advance to 9 BTDC the fan hardly ever kicks in, also reduced fuel consumption by about 1 ltr per 100 klms and best of all no stalling on startup.
Well yes with reservations.Quote:
Is it a case of advancing as far as possible for best results IE 10 or 11 if
no pinging.
The vacuum and centrifugal advance are very crude devices. You are increasing total advance at full throttle by increasing static advance.
It is far better to have a computer generated "vacuum" advance curve to increase light throttle advance but leave total advance alone, and the engine can take much more light throttle advance. This is what improves fuel economy.
The centrifugal advance is very slow on these dizzys only going to full advance at 4000RPM.
If you advance too much and in the unlikely event that you held full throttle with high load over 4000RPM,( say heavy caravan up a long hill) there is a risk of quickly melting a piston with too much total advance.
Regards Philip A