View Full Version : ...Twin Carb MPG Debate...
ok lads,
how much MPG (miles-per gallon) do you average with your twin carbs ?
how much ? worth of fuel to you put in per week ?
thinkin about getting a set of weber 40's for my next car but I'm thinking about fuel economy as its gunna be used everyday to go back and for work etc. I don't want to be spending ridiculous amounts of ? on petrol tbh as I'm working part-time
I've already got a 32/34 Weber sitting here...will that be a better compromise between performance and MPG bearing in mind I will be tuning the 1300 engine
?
Theres nothing to debate, it's a myth that twin 40's give crap mpg. You will probably lose out on a couple of mpg, but thats it. Anyway, it's down to how you drive the car and how well set up the carbs are in the first place. Unfortunatley cabs give you extra power, and with that extra power you tend to drive the car harder, thus using up fuel quicker because your driving the car harder.
Also, if your wanting to make performance enhancing modifications to your car, you shouldn't be worrying about mpg. It's swings and roundabouts. You can drive a car with 40's at low revs and not push the car and keep up good mpg, but lets face it, you're not going to be driving around at 3000rpm after you've shelled out for carbs and engine work. You're spending the money in order to make the car faster. To make the car faster you need to drive it harder, to drive it harder, you will use more fuel.
I feel like I've repeated myself, but I've lost count the number of times this sort of post has cropped up.
Jim
dan_mk1
29-06-04, 12:05 PM
i think the question is more if you can resist from putting your foot down? its easier said than done! like jim said...it depends on how you drive the car....
Once mine is all rebuilt i'm gona have to run the engine in for 1000miles+drive it very nicely. So once its rolloing roaded i think my foot is gona suddenly become very heavy....... :D
if they are set up correctly mpg isnt an issue. Mine averages 30mpg under 'general' driving conditions, this can be upped if drive very carefully but for the same reason as jim pointed out, it wasnt built for that reason so will never get driven such a way.
Snowface
29-06-04, 06:21 PM
i average 35mpg on a weber 32/34 when driving normally and pretty much the same when driving hardish.
I keep the rev's fairly high (2.8-4k) when driving 'normally' due to the Kent ast2.
obviously the greater the capacity the more mpg (1600 T40 will do less than 1300 T40) so may be good to quote capacity aswell as mpg.
quite a few don't get their carb's set up propper so i guess thats where the horro stories about mpg come from.
Philsutton
29-06-04, 06:25 PM
mine was p**s poor but then again i drove it like it was built for
i usually get around 220miles to a tank full. thats about 28mpg.
hmmm..i think i could live with that...
giving it some then benji ?
or granny driving ?
i have a company van with free diesel, what do you think the nova gets used for :twisted:
Nova13SRacer
29-06-04, 10:03 PM
if you buy the t40's u will boot it there is no doubt about it. when i got mine 2 years ago i drove off the forcourt like a granny in a honda. then got up the road a nailed it and they havent really gone steadaly since . well not till this engine when i found out the bottom end had gone then a valve droped but thats a different story. jim i want u on the strip when its al run in. gettin the new engine very soon. packing a punch aswell
spec? it must be good if you feel you can rival jim's
Nova13SRacer
29-06-04, 10:08 PM
gettin a fully tuned all steel race engine. so i feel i can rival jim the engine has done 3 meets. plus its cheaper than a recon engine :lol: i cant wait till the end of the month to get it.
it all depends lol my mate has twin 40's on a 1.6 and his is a bit funny with petrol. he does drive a bit hard i think
spec? it must be good if you feel you can rival jim's
what is Jim having done then ?
Why is everyone wanting to rival me? lol. Dan's the one with the quickest N/A 1.6. Mines not even been started yet, lol.
Jim
I dont want mine to rival anyones i just want a quick 1600 :D
BigRuss
30-06-04, 12:22 PM
All steel 1600, cheaper than a re-con :?: :o :?:
First of all the only all steel 1600cc Vauxhall engines are the ones fitted to the current JWRC spec S1600 Corsa kit cars, they are ?20,000:00p plus :o .
If You are referring to a 1600 8v, there is no such thing as an all steel one of those on the planet. Trust Me on that.
Babbsy,
I'm not calling You a liar I am merely fore warning You that You might be giving good money for something that is not what You think it is. Ask for reciepts, contact the guy who built the engine etc...
Barney,
As the other wise people have already said, if driven moderately You can get good MPG out of twin 40's. Especially on a long run at say 70 -75 on the motorway. But remember Abingdon, I bought ?60 of petrol and came home with 1/4 of a tank and all the Jerry cans were empty. The rally was 88miles long so that's about 1.5 miles per pound. 6mpg :o :o
Jim,
I'm glad everyone goes on about Your car/engine and Dan's, that way they won't see Me coming will they? I will be at a meeting this year, I promise 8)
Nova13SRacer
30-06-04, 07:59 PM
bigruss the engine im buyin it off used to race it before having a rather nasty accident plus who said it was a 1600 :?: :?: :?: i certainly didnt.
the engine that i am gettin is a 1.3s in full race trim. everybody no's the 1.3 was the fastest engine they built 4 the nova and in full race trim its going to be pushing 120 at the wheel so bout 140 at the fly i reckon.
Ill be gettin it on the rolling road begining of october when the full stainless goes on.
the works.
lol, ok....like what ?
the engine that i am gettin is a 1.3s in full race trim. everybody no's the 1.3 was the fastest engine they built 4 the nova and in full race trim its going to be pushing 120 at the wheel so bout 140 at the fly i reckon.
lol, Russ is pushing over 160 brake mate.
whats been done to your 1.3 engine altogether mate ? got a spec on it ? how much it costing you ?
Barney,
As the other wise people have already said, if driven moderately You can get good MPG out of twin 40's. Especially on a long run at say 70 -75 on the motorway. But remember Abingdon, I bought ?60 of petrol and came home with 1/4 of a tank and all the Jerry cans were empty. The rally was 88miles long so that's about 1.5 miles per pound. 6mpg :o :o
yeah mate, mad that was! mind you I aint quite gunna be running the spec you are :D :wink:
i'll be arite coming back and for Bridgend then mate with the forties
Nova13SRacer
30-06-04, 08:13 PM
its costing me nothing to get the engine done cos its all done just sat in a garage waitin to be used. Its bin out of the car 4 about 3 months. the engine is costing ?900 including fittin. to ave got the engine built to the same standard it would cost me bout ?2500 so im gettin a bargain i think
ok...whats been done to it then (if its in full race trim) ?
Nova13SRacer
30-06-04, 08:32 PM
all steel pistons solid lifters and retainers port polish lighten balance big piper cam (think its piper) my t40's conrods all done valve seats polished out. will get a full tech spec on monay when i can get down to the garage and will post it on here under a new post
Jim,
I'm glad everyone goes on about Your car/engine and Dan's, that way they won't see Me coming will they? I will be at a meeting this year, I promise 8)
LOL, I know Russ :) You'll kick all our asses :) Theres also Mike Oxford to consider. I heard he ran a 15.02 1/4 just before PV :?:
Best time I ran was a 15.28, so really people need to be looking at Mike Oxford and Dan and yourself if they want to achieve the fastest N/A 1.6 8v.
Jim
if i can get 6mpg ill be impressed lol
i can get 6.9 out of the omega if i try :D
the nova well. to be fair i dont care how much it will use.
jkhilton
30-06-04, 10:20 PM
in my evo, if I drive carefully, I get around 200-210 miles from a full tank (?35-?40), but if I drive it how it should be driven, then I get around 100miles for a full tank!!! :lol:
in my evo, if I drive carefully, I get around 200-210 miles from a full tank (?35-?40), but if I drive it how it should be driven, then I get around 100miles for a full tank!!! :lol:
:o how big's the tank? 60 liters? the nova one is only 40 and i get 200 mile's from that
everybody no's the 1.3 was the fastest engine they built 4 the nova.
the 1600 is the fastest nova engine. the 1.3 sport engine had a cam and t40's, stick them on a 1600 then that will be faster.
you gonna be using this 'steel' engine on the road?
jim. not long back you were talking about building the best 1.6 around. dan seems to think so too, otherwise he wouldn't of reshelled the gte.
jkhilton
30-06-04, 11:27 PM
in my evo, if I drive carefully, I get around 200-210 miles from a full tank (?35-?40), but if I drive it how it should be driven, then I get around 100miles for a full tank!!! :lol:
:o how big's the tank? 60 liters? the nova one is only 40 and i get 200 mile's from that
not sure on the size, think it might be 48 litres or something, it works out at between ?35 and ?40 for a full tank of optimax.
it will be 42 liters then. that's what it cost's me. 85p a liter :o
jim. not long back you were talking about building the best 1.6 around. dan seems to think so too, otherwise he wouldn't of reshelled the gte.
lol jim's playing the game right and not blowing his own trumpet until he has run the car. As for my reshell lol, it has nothing to do with jims car. The reshell was talked about even before i had ran the gte on the pod etc when i was looking into hillclimbing/sprints, just i was such a lazy arse to get round to starting it.
ok, so...
how much is the inlet manifold for weber 40s to fit a 1.3 ?
how much is the linkage ?
trumpets/filters ?
and how much should I pay for a decent set of carbs ?
Cheers, just trying to get some price ideas
:+:
we should have a good few 'small engined' flyers on this site now...Jim's 1.6, Dan's after reshell, Skoob's, already got Russ's, CP ? or is it MC that has the 1.4 valver, etc etc...good stuff like
the next santa pod day should be good.
jim. not long back you were talking about building the best 1.6 around. dan seems to think so too, otherwise he wouldn't of reshelled the gte.
LOL Benji. Dan and I have been playing Mind games. Think of us as Alec Ferguson and Arsene Wenger ;)
I've only ever said mine would be the best as a joke. The engine hasn't even been started yet, then theres the running in of the engine. Theres still a long way to go before you'll see my car on the strip.
Also, I'm not building my car purely for speed, it's not as stripped out as it could be, I've got a bodykit on it, 16's, electric windows, etc. I'd like to think it'll be a good all rounder, nice to look at and goes well. As to how well it'll go, we'll have to see.
Jim
BigRuss
01-07-04, 10:24 AM
JIMMMMMMMMMM!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Modesty is a virtue :roll:
So when is this 1600 8v debate going to be settled then?
So when is this 1600 8v debate going to be settled then?
It'll be settled when you get your ass on the strip and show us all what a 1.6 8v can really do ;)
Jim
it is what you might call 'nippy' lol
and I only had 1st and 2nd :o :D
Nova13SRacer
01-07-04, 01:19 PM
i willbe runnin the enigine onthe road.
i paid 500 quid all in for my t40's and thats all brand spanking new a bargain i think from a guy in devon when i lived down there.
think by a rule u are looking bout 600 to 750 all before fitting and settin up
i can get 999.99 miles per gallon out the vectra :!:
Babbsy, post some pics of the engine when you go down there.
i can get that too ben :p hmm 6.9mpg to 999.99 in about 10seconds
Snowface
01-07-04, 06:11 PM
the most i've dared get on a tank is 277 miles with my current engine setup. When i had teh 1200 block in and standard cam i could get 333miles.
have you got forties Snowface ?
what else you planning for your engine mate ?
have you had it rolling roaded ?
he's got a 1.3 with a cam and carb, not t40's.(i think)
you got 40's though benji aint ya...
what else you got planned for yours then ?
rebuild, cam, better head work.
tidy...
you already got head work though no ?
seems a good 1/4 mile time with standard cam mate...
looking at Kent/Piper cam is it ?
the head i've got is a sri head ported to match a 1300 inlet and the inlet ports gasflowed, nothing major. eventually i would like a B+ or similar spec head. the cam i am getting is a piper 285. i also need some new carbs
hows that ?
won't be cheap :|
:+:
Snowface
04-07-04, 06:09 PM
i got weber 32/34, 1200 head on a rally spec bottom end.
Soon to be B+ head
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