I am looking to buy bike carbs/throttle bodies for my mk2 coupe s. I know ther has been other posts on the subject but wondered if anyone who runs bike carbs/throttle bodies had any advice on what to buy and what to expect for your money. How much you looking at price wise from the car being completely standard (eingine, manifold, exhaust etc) to actually running with the bike carbs/throttle bodies? Any help or advice will be greatly appreciated!!

cheers

Well, you're looking at £300+ for a set of bike carbs/correct jets/manifold and RR setting up.... Worth every penny though.. you'll notice a huge difference and the noise is awesome! Throttle bodies are somthing i don't know much about, apart from they are VERY expensive

£300.....i thought it would be much more than that for something basic....i will have the money to do it right i just wanna know which carbs or throttle bodies are best for the job......can't wait for some real engine noise all i have at the moment is exhaust rattle Going to get that sorted ASAP though sounds real bad

Throttle bodies are somthing i don't know much about, apart from they are VERY expensive

What? my 1,3 throttle body for my 1.05 was £15 from a scrappys lol

Honda CBR600 carbs are ideal usually £30-50

i don't understand where you get the jets for the motorbike carbs? Anyone know?

speedfreak - what you on about mert? your on about a single carb, not 4 individual ones

Yeah £250-300 sounds about right unless your going to diy. I hope you know theres a difference between throttle bodies and carbs? throttle bodies run injection and you will require a proggramable ecu program such as mega squirt. common to both throttle bodies and carbs though is the following, you will need a throttle cable linkage, a custom inlet manifold, trumpets, socks or air filters, the fueling will need adjusting and adjusting as a whole on a rolling road to get the most out of them, they will also require new jets. So i would say £250-300 is a fair guesstimate....You will only see some real good gains with port and matched gas flowed head.

hope this helps.

i knew there was a difference between the two i just wasn't sure exactly what it was. I mean i am looking at the best way to spend my money. I would pay more if throttle bodies are a much better way to go. The money isn't too much of an issue and i am not trying to do it on any sort of a budget and would rather be getting the best from it than do a bodged DIY job. Just wanted to see what other people were running and how well it works and the rough cost. Are most of the parts you need easy to source? I have read all the oither threads i can find on here regarding motorbike carbs etc. All replies have been good help though, keep em coming. Any links, books, manuals or any other info is greatly appreciated.

Cheers

speedfreak - what you on about mert? your on about a single carb, not 4 individual ones

Oh i seem to have misunderstood, sorry. Are you on about 4 seperate bike throttle bodys then?

i don't understand where you get the jets for the motorbike carbs? Anyone know?

If the size is too big, then you fill them with solder and redrill them. If they are too small, then just drill them larger. You need a session on a rolling road with a knowlegeable person though. You can't just guesstimate them.

You can gat a dynojet kit for motorbike carbs that consists of different sized jets and needles to allow it to be set up to whatever mods you have on your bike so that would be the best thing to get, any motorcycle dealer can get them or you could get them off the net. Either that or go into your local bike dealer and ask is they have a selection of jets for a CBR600, they might have ones left over from a customers dynojet that theyd sell you.

I have a set of Throttle bodies off an R1 for sale if your interested PM me. I ran my polo gt on bike carbs i used gsxr600 carbs on a manifold that any local engineering company will make (just consist of 4 tubes with flanges welded on them) the cost of the carbs on the manifold was £140 then fitted them myself. As you are running a mk2 on them it should be fine on the mk3 you need to get a mk2 fuel pump and a vacuum advance dizzy. The power increase is something else as is the noise but if you are going to use it daily so is the fuel consumption. Driving normally you are getting around 15-20 mpg MAX. Nailing it you get about 6!!!. Put it like this i bought my vento vr6 afterwards and its cheaper to run even if i nail it. Also once fitted your have to get them set up on a rolling road there are loads of ways your can set them up at home but tried them and nothing was as good as the rolling road. The cost was only about 60 quid to get them sorted and it was immense afterwards but agian you need to get them set up every 6 months for perfect running all the time. I would say they are worth every penny if you are using the car occasionally but for every day use they are a little bit too expensive. But if you used motorbike throttle bodies it would cost more as you would need to buy some sort of management for them but in the long run it would be cheaper as they are more efficient you also get more power than you do from the carbs PM me if your interested in the R1s the price is rather suprising.

Rob

Cheers rob you just put me off bike carbs!! :) I was considering them for my daily & can't afford worse fuel consumption at all.. Looks like I'll get a twin choke Webber.

Cheers rob you just put me off bike carbs!! :) I was considering them for my daily & can't afford worse fuel consumption at all.. Looks like I'll get a twin choke Webber.

Twin choke webber conversions rock.

Rob

15-20mpg seems abit wrong to me

wow petrol consumption is a bit suprizing....especially after you read some of the other threads on bike carbs. Good to know though. Won't be running the car as a daily run about but if throttle bodies are that little bit better i would rather pay more. More complicated and more money ......sounds good to me lol. All the help much appreciated and i may be interested in the carbs anyhow. Will PM you lter. cheers

Individual throttle bodies usually hold all, if not more, power advantages than carbs but one of their better features is fuel economy. When you aren't nailing it, mpg shouldn't be much worse than standard because they are so much more efficient. 15-20 mpg is definately a bit wrong, something can't have been set up right.

And a pair of twin choke Webers won't see you above 30 mpg.

Yeh 15-20 mpg does sound pretty bad. Surely can't have been running right. I've got twin 40's on mine and a 268/268 cam and I get about 35 on a run, if i absolutly rag (and i mean at 7k in every gear) the worst iv'e got is about 25 i reckon. But all engines are different, how theyv'e been driven wear on the rings and bores etc...

Rob,i dont know what you're talking about. Anything less than 30mpg from a 1300 means the engine is running rich,or the fuel delivery is inconsistent - bike carbs squirt precisely the right amount of fuel into each cylinder independently,thus being more efficient than a single carb/injector. Yours must have been in a right state,spraying unburnt fuel out the exhaust. My MK2 CoupeS has CBR900F bike carbs with 150 jets feeding a 1600cc lump,and despite eating hot-hatches for breakfast,it will tour over 100 miles on £10 worth of fuel - its as economical as the old Pierburg-fed 1300 was. Pictures are in a topic in this thread called 'Bike carbs - i need to learn' and the whole conversion cost me £50. I used the original throttle cable,with 4x random flanges/1.25" washers/6" long suction hose as a manifold. You can use jets for a weber,they fit,and cost less than £2 from Burton Engineering. They're simple to adjust,and once adjusted they've stayed true. Hey,maybe i just got incredibly lucky.. Bike throttle bodies (injection) would be even more efficient and accurate if re-mapped correctly,but I've not yet looked into them.

Have you got any idea on power output Mikey? I'm pretty interested in a bike carb or throttle body setup, and the economy you're getting is probably one of the main factors, but power would be good too

The rolling road that you apparantly need hasnt been visited,so i dont know. Its about as fast as a Lupo GTi on standard 138 jets,but it was running a bit lean. I only had a 1.5mm drill bit,so i could only take them to 150s,though one of the Bogg brothers told me i really needed to go 165 to get the best out of it. Still,150s proved mental - and killed my perfectly good gearbox within 100 miles.. I estimate about 120bhp as a conservative guess,but thats really off the top of my head,and its possibly far more. Its less than half the weight of a Golf R32 though,so the power2weight ratio is higher than the Golf's at a good 170bhp per ton. Which is all you need really,if you just use it for normal daily use.

Instead of bumping it,here's the link for pictures and more info on mine.. http://www.clubpolo.co.uk/forum/index.php?showtopic=65310 Three pages,i think - the first is info,second pictures,and the third is just off-topic stylee unfinished business.. :-D

Cheers rob you just put me off bike carbs!! :) I was considering them for my daily & can't afford worse fuel consumption at all.. Looks like I'll get a twin choke Webber.

:lol:

Even worse. My mates just got his 8v GTI running on twin choke dellorto 40's, mpg is down noise and power is up :-D

Totally ate a citroen c2 vts the other day!! Mind the head and inlet has been ported and matched and it has a high lift camshaft.

The twin choke weber narrow lane is talking about is completely different to dellorto 40's. The weber is a down draught, delorto 40's are similar to bike carbs, side draught.

Yeah, that is wrong, you need to get your car set up properly!

I'm on twin 40's which are reputidly bad MPG, but i still get around 25mpg however i drive, and they havn't even been set up by anyone but me, a 16 year old boy