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25 MPG?!
smart51 - 6/1/06 at 03:40 PM

Is that really what a BEC will return? 25 MPG?
And that's not been "racing" driving wither, though it was certainly not the ay my mum would drive (or my dad for that matter)

I know it's been cold and that I've needed the choke to get it started but come on!


zilspeed - 6/1/06 at 03:44 PM

Does this surprise you ?

Honestly ?


OX - 6/1/06 at 03:45 PM

hehe at least your in double figures

its the low gearing high rpm and the extra weight that nails the fuel bill

[Edited on 6/1/06 by OX]


mak - 6/1/06 at 03:47 PM

I would have expected more.


graememk - 6/1/06 at 03:49 PM

i have a ride on lawn mower that does less than that and its much slower

i think you should stop moaning.


Chippy - 6/1/06 at 03:50 PM

And yet another reason to say NO to BEC.


skydivepaul - 6/1/06 at 03:50 PM

you lucky b@st@rd.


smart51 - 6/1/06 at 03:52 PM

Surprised? Not really. I was expecting about 30 though.
I guess I've been spoied by my smart. Driven hard it will "only" return 50 MPG.

Another reason not to buy a BEC? Will a similarly quick CEC do any better?


jimgiblett - 6/1/06 at 03:57 PM

I used to get 20mpg on track 30mpg on the road with a carbed R1 in my Phoenix.

This is better than my mates Furyblade.

Which on long runs was consistently 10% worse than me.

Jim


zxrlocost - 6/1/06 at 04:07 PM

Oh my god I would think 25 mpg was a god send

my Z used to do 13mpg if it liked it..I used to put 20 quid of petrol a day in for just pottering around and we figured the once that it was costing me 250 quid a week for turning the key due to age and insurance etc 19" tyres 600 pound service

beautiful car and never broke down once

the costs would have doubled if it did

chris


Jon Ison - 6/1/06 at 04:13 PM

OK, there locosts but does anyone really care about the mpg when youve got the wind in your air........

I never checked mine until i started racing it and that was only too make sure i wasn't either going too run out of juice or worse still carry too much, petrol is heavy.

1st race at Mallory last year they misprinted race length, cant remember how many laps but it was a few more than printed, 3 cars ran out and Ian Gray was chased out the pit lane with a jerry can full of petrol as was trying too top up the "purple cars" when he realised the mistake.


zxrlocost - 6/1/06 at 04:20 PM

precisely


kb58 - 6/1/06 at 04:36 PM

I bet if you removed the barn door of a windscreen, and converted to cycle fenders, you'd improve mileage a lot.


britishtrident - 6/1/06 at 04:39 PM

There was a 70s Kawasaki Mach 3 two stroke triple that did 13 mpg and that didn't vary much with engine size which istr were 250 or 500 or 750 :-)


andybod - 6/1/06 at 04:53 PM

think yourself lucky my mistubishi evo's avareging around 18 upto 21 if i drive like a grannie


phelpsa - 6/1/06 at 05:04 PM

Yup think yourself lucky, our scooby does 25mpg at a steady 70 on the motorway. Took it to the 'ring and it averaged about 10mpg

Adam


Humbug - 6/1/06 at 05:15 PM

quote:
Originally posted by kb58
I bet if you removed the barn door of a windscreen, and converted to cycle fenders, you'd improve mileage a lot.


o/t, but have just looked at the pics of your Mini, kb58, and it looks wild! Great job


steve_gus - 6/1/06 at 05:41 PM

quote:
Originally posted by britishtrident
There was a 70s Kawasaki Mach 3 two stroke triple that did 13 mpg and that didn't vary much with engine size which istr were 250 or 500 or 750 :-)


thats not quite true.....


the H1 and H2 may have been a bit juicy - and the s1 250 did a few 10s of mpg.

However, my KH250 (later S1) and the one i had in the 70's would get a heady 45mpg if driven kindly and 27 mpg 2 up at full whack.


My jag v12 used to indicate 3mpg on accelleration.....

seems that 20 odd mpg is normal for a CEC, and a bike engine that would have done 40 mpg with over twice the weight and driven hard isnt suprising to get 25 mpg.

150hp from a litre or so obviosly needs a bit of fuel when driven hard....

atb

steve


kb58 - 6/1/06 at 06:06 PM

I don't think it's the weight but that the Cd of the Locost sucks eggs. If a bike-engine were put in an aerodynamically slick car, I think most of the mileage would come back.


Peteff - 6/1/06 at 06:07 PM

My friend had a Suzuki Kettle that used to get 15mpg on a run, single figures if he used it local.


gazza285 - 6/1/06 at 06:34 PM

quote:
Originally posted by Peteff
My friend had a Suzuki Kettle that used to get 15mpg on a run, single figures if he used it local.


That was probably caused by the engine acting like an air brake.


rayward - 6/1/06 at 09:05 PM

25mpg...............

your not thrashing it hard enough

Ray


smart51 - 6/1/06 at 09:24 PM

quote:
Originally posted by rayward
25mpg...............your not thrashing it hard enough


You're not far wrong. I've only had number plates for a week. I havn't fitted a dynojet kit yest and the fuelling is a bit off at full throttle, so I'm being (almost) careful


Genesis - 6/1/06 at 09:33 PM

That mpg is to be expected...

Rather have BEC than CEC any day... besides the money you save on Road Tax is offset by the money you spend on fuel.. but think of the fun you're having at the time!


Hellfire - 6/1/06 at 10:08 PM

Don't worry, once you get it properly tuned you'll probably get about 26mpg

Ours seems to average about 20mpg. You're either quite fortunate - or simply driving like a girl. I think I know which


big_wasa - 6/1/06 at 10:47 PM

My Rf900 only just did that ,and thats without towing a car


ChrisGamlin - 6/1/06 at 10:50 PM

Its also gearing as mentioned before. A mate went to Le Mans a few years ago with his Megablade, and the combination of a 3.2 (Freelander) diff and 185-70-13" tyres raised the theoretical gearing to around 150mph, and he got nearly 50mpg from it!
I dont monitor it on the road but so far Ive found the injected R1 to use a bit more than the blade did on track, I usually get a days trackdaying (about 100-150 miles) on a tankful plus a jerry can so about 40-45L (10gal) of fuel, Ive not worked it out before but that equates to about 10mpg at worse, or 15mpg at best.


G.Man - 7/1/06 at 06:59 AM

So glad I have a 54ltr baffled foam filled tank on mine, My bike only did 30 at best.. Bikes being economical is a myth.. the power has to come from somewhere, and its fuel...


tony9876 - 7/1/06 at 12:22 PM

I had a busa engined car bored out to 1400cc and never reaaly took much notice but on a track day at oulton park I got through £60.


ChrisGamlin - 7/1/06 at 05:37 PM

Yep the busa's certainly drink more on track than the R1 / blade, my mate regularly gets through a tank plus two jerry cans on the same trackdays as me with his Megabusa


ASH3 - 7/1/06 at 05:44 PM

My trip to Le Man she well
behaved at 35mpg. just cost a mint
in Rectifiers cured that one now


kobushi - 23/1/06 at 09:56 PM

25mpg isn't bad at all...
My project will have 2 busa motors... I'll be happy to get 8mpg when pushing it wth both spiritedly ^_^

But I have an Insight to offset that (65mpg+) hehe