its been asked before but...

[razersedge]

ive heard twin carbs are a bitch round town and in traffic etc and i do quite a lot of town driving

 

only if they are badly set up or over fueling, mine is just like driving a normal car with a twin choke now it's been set up even with the leary cams in it, it tick's over at 900 rpm just one little splutter at 3800rpm but thats the cams just before they get to the power band (and guess where 70mph in 5th gear is ) if fuel economy is the main issue then stick with a twin choke and recondition it, if it fuel and speed bike carbs, if its having that edge on the bits of plastic off the line the 40's but it's a very thin line on the last two, if you love the sound of barking carbs then 40's every time and get some shares in bp

[antz]

is there actually much power difference in twin 40s and bike carbs?

 

if its minimal then i might get the bike ones just for the savings on fuel

[razersedge]

40's are more responsive than injection units bike carbs are a form of injection, look at the xr.3 and the xr.3i the from the original ford spec list the xr.3 was faster 0-60 than the xr.3i but the xr.3i was faster top end but i'm not sure what was faster 60-100

 

 

it depends on how you drive but i would say if you drive sensibly(most of the time) then the 40's would be better if your a little foot happy then i would say the carbs and if your foot is made of lead the it doesn't mater because you will never see 10 to the gallon ever again

[antz]

i do have a rather heavy foot

 

think i might try the 40s and see what its like

[razersedge]

good choice but i am going to post the info i was trying to find any way

xr.3 0-60 time 9.2 seconds 96 bhp 98lb toque 116mph

xr.3i 0-60 time 9.3 seconds 96 bhp 98lb toque 120mph early 3i not the 105bhp one

[antz]

theres fook all in that with the xr 3s

 

seems whatever i do im gonna get bad fuel economy and power i want.

 

problem solved.

[razersedge]

yep but the 40's sound better

[Tom]

So let me get this straight. You want a big power engine that is going to return 35+mpg?

 

Fit a turbo diesel.

 

But get this, originally i ran 40's on my pinto and after a while i fitted 45's.

 

I was getting better fuel consumption on the 45's than i ever did on the 40's

 

now work that out!!

[antz]

i dont want perfect fuel consumption. just dont want shares in bp