goaty
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| posted on 1/11/08 at 01:00 PM |
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Bike carbs output
Hi
Can bike carbs give the same amount of power as to a set of twin 40's??
This is on a 2.0 pinto with race head and cam, will they give similar, more or less power??
I know they will improve driveability but i dont want to be loosing out on the track.
someone please hlep befor ei go and buy some.
cheers
goaty
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BenB
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| posted on 1/11/08 at 01:17 PM |
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Depends which carbs you go for!!! If you go for adequately sized carbs (ie not so small that it strangles the engine) you should get more BHP, better
MPG and better drivability than on twin Webers.
Although Webers sound great and (if correctly adjusted) can provide good performance they're ancient technology.
Perhaps think of it this way. If you lost the twin 40s and went for quad (smaller) Webers you'd get a performance boost. Then ditch the 1960s
technology in exchange for 1990s carb design and voila!! IMHO webers are best where they belong- ie classic cars (and even then only on concours 
classics).
Personally though I'd go for TBs and go EFi. When you adjust carbs unless you've extremely lucky (or prepared to spend the rest of your
life adjusting them) it's always a compromise. You'll never get the mixture right across the rev range at any load setting.
Consider that many modern EFIs are self-tuning, for £500 for an Emerald, £130 for an Innovate LC1 and a few quid for fuel pumps etc you can go EFi- no
more compromises!!! 
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goaty
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| posted on 1/11/08 at 01:24 PM |
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cool thanks for the info, i didn't really think about it it that way.
As for EFI i dont want to spend the money changing it all over as i only want this engine till next year i will have my supercharged 16v finished and
ready.
Think i will get some bike carbs, Would Fireblades be ok for my 2.0??
I will keep my twin 40's just in case i change my mind.
thanks agian
goaty
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SPYDER
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| posted on 1/11/08 at 07:09 PM |
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quote:
Originally posted by BenB
.....ditch the 1960s technology in exchange for 1990s carb design.....
The CV type carburretor was patented in 1905 by George Skinner. There really isn't much difference between CV carbs of the SU type and CV bike
carbs. They are as old as the internal combustion engine itself. ( almost)
But Ben B is right to suggest that they can give improvements over WEBERS if set up correctly.
Your 40's will have venturis inside which mean that your engine is breathing through a 32mm or up to 36mm orifice. It could be less than 30mm,
it depends on fitment.
A set of 38mm or 40mm bike carbs will breath better as they have less restrictions inside. Even 36mm ones could be an improvement.
But correct setup is everything whether using CV's, WEBERS or EFI.
Virtually any rolling road operator can get WEBERS right, but not everyone can sort out bike carbs.
Same goes for EFI. Different operators will specialize in different systems.
Megasquirt can be the most economical to fit but many operators won't touch it.
Ask your local operator if he can setup bike carbs. If he can't, Bogg Brothers can.
Fieblade carbs should be OK for your PINTO, but don't expect them to work without proper setup.
I've got loads of different MAIN jets to suit MIKUNIs. Coincidentally they are the same as WEBER jets. If you can find out what sizes you are
likely to need as a starting point drop me a U2U.
I have 40's and Megasquirt V3 on my car.
Figure that one out.
Geoff.
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BenB
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| posted on 1/11/08 at 07:26 PM |
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Yes I did realise that when I wrote it but hope no-one would notice it
It's true the CV type carbs aren't exactly super hi-tech!!!
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sonic
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| posted on 1/11/08 at 08:32 PM |
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Hello Goaty
Take it from me throw the webbers in a skip and fit either R1 or ZX9 40mm bike carbs.
I fitted them to my 1.9 205 and the diffrence was increddible.
Pulled in 5th gear at 20mph and the torgue was great,sounded fantastic and better fuel consumption.
The car started better from cold and ran alot smoother.
Another time i was watching a grass tracker on a rolling road with a very highly tuned Pinto which was just having the conversion done from twin
40's to R1 carbs and it made plus 20 bhp more and the owner was gob smacked at the change in the way it went.
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goaty
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| posted on 1/11/08 at 08:43 PM |
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cool thanks for all the info guys. I got my eye on some at the mo so will see how it goes.
thanks again
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goaty
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| posted on 1/11/08 at 08:47 PM |
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One other thing.
does anyone know of a good rr to set them up further south than bogg bros??
I am near gatwick so they are a little far really.
cheers again
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sonic
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| posted on 1/11/08 at 08:53 PM |
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Hello Goaty
Ring Steve at Bogg's and get a price for you to send your carbs and have him strip them, clean and re jet for your engine spec,after that put
them on and the car will start on the key straight away an will only require minor tweaks to make spot on,when i did my 205 i did the above and it ran
straight away spot on and when checked on there rollers it required half a turn on the mixture screw to get 100%
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goaty
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| posted on 1/11/08 at 09:06 PM |
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cool, time to sort some carbs out then.
cheers for the help
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goaty
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| posted on 2/11/08 at 05:43 PM |
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any tuners down south that are well known?
thanks
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bill132hotrod
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| posted on 2/11/08 at 08:16 PM |
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Carb tuning
Ive got a Vauxhall C20XE on bike carbs they have been to bogg brothers for an overhall and booked into Sanspeed at Bexlyheath for tuning at the end of
the week Peter is the man to talk to Ive been using him for about 15yrs he has tuned my race car every year and never had any problems.
His number is 02083034314 (Peter)
PERSEVERANCE is the word of the week. Stick with it the results are SWEET.
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goaty
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| posted on 2/11/08 at 09:25 PM |
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cool they not far from me.
I was planning on using Sanspeed or HT for my 40's but handy to know they can do bike carbs.
time to find some now
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