edcobb
Part of things
Yellow=Faster
Posts: 167
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Got to be a few of you using bike carbs on here! lets see your pics and thoughts.... Have done a few conversions on various cars, happy with the results.. Will be putting a set of R6 carbs on the pinto when i collect the escort so will update with pics then..Heres a few of my pics from various projects.. 106 - 1.6 8v R6 Carbs XR2 - 1.6 8v Fazer carbs - first one i did two years ago on my xr XR2 - 1.6 8v Unknown carbs BMW M40 1.6 - GSXR carbs never finished this.. started it then got distracted by big engines.. cheers
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1980, 20valve Mk2 escort 1986, Mk1 Mr2
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Mr S
Posted a lot
10-4 Good buddy.
Posts: 2,654
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I could show you mine, but they're all attached to my bikes, so wouldn't be that interesting
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Suzuki GSXR1000 K2 BMW R1150GS BMW K1200RS Chevy K5 Blazer Chevy Suburban LT Jaguar XKR
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AHHHAH. I'm going to be fitting bike carbs to my TU3S engined 205 soon... any closer pics of your manifold? These 40mm mikunis to be exact!
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Last Edit: Mar 5, 2008 21:44:56 GMT by Adam
1997 TVR Chimaera 2009 Westfield Megabusa
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edcobb
Part of things
Yellow=Faster
Posts: 167
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AHHHAH. I'm going to be fitting bike carbs to my TU3S engined 205 soon... any closer pics of your manifold? These 40mm mikunis to be exact! Sorry mate, i don't have any more pics of the tu one.. If you are bike carbing yours my suggestion is that you get rid of youre head, and fit a 106 rallye head and cam, then bike carbs on that.. You then have a much better head and cam, then you can put your distributor housing into the rallye head. This is what i did on my 205 rallye but with 40s.. Its a simple bolt on affair. You will have to block the injector ports on the head but this can be done using just a fuel rail and injectors or just make up some little blanks.. This combo on the 1400 makes a lovely little engine. I will be going back home to devon on the bank holiday weekend and think i have a head and cam still somewhere so i will try and dig it out for you! cheers
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1980, 20valve Mk2 escort 1986, Mk1 Mr2
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I'd love to fit a 106 rallye head and cam, and if you've got one going spare..! How much do you want for them?
Adam
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1997 TVR Chimaera 2009 Westfield Megabusa
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rob0r
East of England
Posts: 2,743
Club RR Member Number: 104
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Lets see your bike carbs!rob0r
@rob0r
Club Retro Rides Member 104
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BMW M40 1.6 - GSXR carbs never finished this.. started it then got distracted by big engines.. Any better pictures of this? How much gain were you expecting over the M40 with standard injection? Cheers
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E30 320i 3.5 - E23 730 - E3 3.0si - E21 316 M42 - E32 750i ETC
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edcobb
Part of things
Yellow=Faster
Posts: 167
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1980, 20valve Mk2 escort 1986, Mk1 Mr2
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[stoopid question] whats the differences fitting-wise and what are the advantages of doing this over fitting normal carbs like twin 40`s etc? [/stoopid question]
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1986 Panda 4x4. 1990 Metro Sport. 1999 Ford Escort estate.
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slater
Club Retro Rides Member
Posts: 6,390
Club RR Member Number: 78
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Lets see your bike carbs!slater
@slater
Club Retro Rides Member 78
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Cost mainly, twin 40s are mega overpriced cous old men like to stick them on their fords and rememeber what it was like in the 70s.
Bike carbs are more modern/refined/compact/cheaper
Fitting involves making a simple manifold and modding a throttle cable then a session on the rollers to get the jetting 'right'.
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edcobb
Part of things
Yellow=Faster
Posts: 167
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Just like slater said!
When you think about it, webers etc are based on a 50s, compromised design, Bike carbs are designed by geniuses with computers,haha when setup correctly will be far supperior at providing the right amount of fuel accross the rev range.. And they are cheeeeeeep ;D
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1980, 20valve Mk2 escort 1986, Mk1 Mr2
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redgt2
Part of things
praise the lowered!
Posts: 863
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does anyone get carb icing issues with runnin on bike carbs...
some bikes were notorious for it...GPZ900 to name one...
and some cars with bolt on filters like to cut out a lot cos of it...
so what's the score with these?
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J.P
Posted a lot
I like to eat ice cream and I really enjoy a nice pair of slacks.
Posts: 1,175
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when setup correctly will be far supperior at providing the right amount of fuel accross the rev range.. And they are cheeeeeeep ;D Is this true though? No-one's ever cleared this up for me. The way i see carbs vs. injection is that carbs have one 'setting' (for want of a better word) of how much fuel will be delivered, decided by timing, mixture and jet settings, which is why on some highly strung carb engines you get too much fuel low end revs as a compromise for the right fuelling at the top end with your peak power. Then if i understand it right injection plus ECU and correct map the amount of fuel, timing etc are all adjusted constantly over the rev range to give the optimum settings at that particular RPM. I always assumed bike carbs were much the same as 'normal' carbs in that they had one 'setting'? Maby my understanding is wrong, could anyone clear this up? I'm maby veering away from the original topic of just pics and can start a new topic if anyone wants Also, bike carbs seem a little hyped up because won't linkages etc bend after a while, since their components are only used to the movement of a hand twisting rather than a heavy foot pushing a throttle pedal? Edcobb - Did you space your carbs out and make different linkages etc or, as it's only occured to me now, did you keep all that standard and used the silicon hose to get it to line up with the manifold? Thats all my questions for the time being
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We're talking bike carbs v webers, not carbs v injection. ;D
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J.P
Posted a lot
I like to eat ice cream and I really enjoy a nice pair of slacks.
Posts: 1,175
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Apologies, phrased it wrongly. If a weber has the one 'setting' (get me a better word) how can bike carbs be any different?
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rob0r
East of England
Posts: 2,743
Club RR Member Number: 104
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Lets see your bike carbs!rob0r
@rob0r
Club Retro Rides Member 104
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Why I took an interest in your M40, because I have this to stuff into my E21. I took interest in your M40 since this is the M42. Can anyone answer me whether or not it would be worth running the engine on bike carbs vs. standard m42 injection. The injection won't be that bad to rig up, so it's whether it will make any gains. Money's tight so I can't really change cams etc Cheers.
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E30 320i 3.5 - E23 730 - E3 3.0si - E21 316 M42 - E32 750i ETC
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I think a lot of bike carbs are varible venturi, like an SU. Webers have fixed venturis which means they have a sweet spot in the rev range where they work best and everything else is a compromise.
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edcobb
Part of things
Yellow=Faster
Posts: 167
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J.P -on the 106 i spaced the carbs, extending the finger on the linkage between the centre of the carbs. On the others i used the manifold to meet up with the carbs..
As said above, compared to webers they are great. Carbs will always be a compromise compared to injection but when you do it yourself they are so much cheaper.
Comparing them side by side to webers, I havent seen any issues with linkages bending or anything like that..
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1980, 20valve Mk2 escort 1986, Mk1 Mr2
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slater
Club Retro Rides Member
Posts: 6,390
Club RR Member Number: 78
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Lets see your bike carbs!slater
@slater
Club Retro Rides Member 78
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Sorry but that make me laugh!
The force required to open the butterflys is still the same so theres no diferance relly. Force on the stop would be greater but i don't think it would be much
Bike carbs are totaly differant to webbers in their design. Carbs don't have 'one setting' either they give to a cirtan amount of fuel for a cirtan pressure drop across the carb, then they piggy back on some odds and ends to compensate for the other stuff like tempreture (choke, bi-metalic strips etc.), throttle opening speed etc. (accel pump). The Bike carb just does it better!
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Bike carbs are a 'constant velocity' design meaning that fuel rises as airflow rises.
Once setup they shouldn't need maintaining either.
*n
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Top grammar tips! Bought = purchased. Brought = relocated Lose = misplace/opposite of win. Loose = your mum
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