Ignition advance question. - TwoWheelForum: Motorcycle and Sportbike forums
 
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post #1 of 6 (permalink) Old 11-07-2007, 01:20 AM Thread Starter
 
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Ignition advance question.

The 49 state 600 F3's have 10* advance at BTDC and the California ones have 5* advance at BTDC, will upping my advance to 10* improve my gas mileage?
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post #2 of 6 (permalink) Old 11-07-2007, 08:25 AM
 
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Ignition advance keeps the timing of firing of the plugs in line with the TDC of the revving motor. Faster it revs the sooner the plugs have to fire in order to fire when the piston is at maximum compression.

Now if the F3 (I had a 1195 49 states model) has no other changes I don't think it would effect gas mileage. Honda probably had the carbs in a leaner position for CA and/or some kind of air injection system/catalyzer in the exhaust and had to retard the ignition to keep it "in synch".

Pipe, jet kit/ air filter, and ignition advancer would have you in better than 49 states tune in a hurry...Mileage may decrease from too much WFT!

Last edited by smileyman; 11-07-2007 at 08:26 AM. Reason: add
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post #3 of 6 (permalink) Old 11-07-2007, 10:44 PM Thread Starter
 
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no catalyzer or EGR, slightly less intake/exhaust lift on the camshaft and 5*less timing including a slightly different jet in the carb.
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post #4 of 6 (permalink) Old 11-07-2007, 11:18 PM
 
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Originally Posted by ptowntsi View Post
The 49 state 600 F3's have 10* advance at BTDC and the California ones have 5* advance at BTDC, will upping my advance to 10* improve my gas mileage?
no...the bike is still burning the same amount of fuel. adjusting the timing will move the powercurve lower. leaning the fuel mixture will increase gas mileage, but will cause the engine to run hotter (use a colder plug). it will also cause pops and surges. engines run best at stoichiometric ratios.

but, properly inflated tires and slow take offs will improve gas mileage.
a high gas mileage sportbike is an oxymoron.

-a|ex
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post #5 of 6 (permalink) Old 11-07-2007, 11:23 PM
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Quote:
Originally Posted by Back _Marker View Post
no...the bike is still burning the same amount of fuel. adjusting the timing will move the powercurve lower. leaning the fuel mixture will increase gas mileage, but will cause the engine to run hotter (use a colder plug). it will also cause pops and surges. engines run best at stoichiometric ratios.

but, properly inflated tires and slow take offs will improve gas mileage.
a high gas mileage sportbike is an oxymoron.

-a|ex
but ya can get good mileage if ya ride with a lil sense to ya

I 've gotten 45mpg or so b4. But I dont have to get over 6-7krpm to get to school either like some do
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post #6 of 6 (permalink) Old 11-08-2007, 09:15 AM
 
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Yup, control your rev's and fuel mileage goes up.

I wouldn't think there would be any reason to ever mess with cams. The extra lift would only move the power further up the rev range, like the ignition advancer.
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