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Maintenance & Repair => Mechanical => Topic started by: elbee on May 31, 2015, 05:57:24 AM

Title: Carb gets more mpg than fi, why?
Post by: elbee on May 31, 2015, 05:57:24 AM
Hey guys,

I've always been told that fuel injection is more efficient. Well my g1 got 180 before hitting reserve.  My b1h with fi got 135.

Why such a massive difference? And I rode it exactly the same way...
Title: Re: Carb gets more mpg than fi, why?
Post by: MOzZereLLa on May 31, 2015, 08:06:48 AM
Are the tanks the same capacity?

The B1 (the finest 600 ever made) has 37cc's more - they use fuel. The engine is 5%ish bigger.

I don't think there's any comparison here.
Title: Re: Carb gets more mpg than fi, why?
Post by: Carbon_ZX6R on May 31, 2015, 09:01:16 AM
Quote from: elbee on May 31, 2015, 05:57:24 AM
Hey guys,

I've always been told that fuel injection is more efficient. Well my g1 got 180 before hitting reserve.  My b1h with fi got 135.

Why such a massive difference? And I rode it exactly the same way...
What wore the mods to each of the motorcycles?
Title: Re: Carb gets more mpg than fi, why?
Post by: Alzo on May 31, 2015, 09:06:59 AM
More efficient means a bigger bang for the fuel used...not necessarily more mpg...that can be achieved by other means...gearing...camshaft timing...and so on.
Title: Re: Carb gets more mpg than fi, why?
Post by: elbee on May 31, 2015, 09:50:47 AM
they were both stock

surely 37 extra cc's doesn't account for the massive range difference?

Title: Re: Carb gets more mpg than fi, why?
Post by: Carbon_ZX6R on May 31, 2015, 10:02:11 AM
I get alot more out the f3 than I do the b1 ive had 200 od miles out of the f3 and the b1 ive had I think 150, but I hardly ride eco friendly ive emptied the tank in under 80 more than once on the road
Title: Re: Carb gets more mpg than fi, why?
Post by: WizzBang on May 31, 2015, 10:47:55 AM
Quote from: elbee on May 31, 2015, 05:57:24 AM
Hey guys,

I've always been told that fuel injection is more efficient. Well my g1 got 180 before hitting reserve.  My b1h with fi got 135.

Why such a massive difference? And I rode it exactly the same way...

Exactly ??

What about weather conditions, wind, humidty ? and then there's the route, exact same route ? if not then differences in more or less corners, type of corners, type of surface.  Then there's the actual bike making a difference, tyres, drivetrain losses etc


Too many variables to consider.


Fill up, ride, repeat.
Title: Re: Carb gets more mpg than fi, why?
Post by: Carbon_ZX6R on May 31, 2015, 11:15:01 AM
At the end of the day none of us ride sportsbikes for the mpg.....
Title: Re: Carb gets more mpg than fi, why?
Post by: David W on June 01, 2015, 07:18:16 AM
He's right though.  My fuel injected bikes all used noticeably more fuel than carb'd bikes.
Probably something to do with how FI works compared to carbs.  The SP2 drank like a fish (46 miles to reserve at Donington).