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Jul 24, 2012 22:40:33 GMT
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Gents,
I'm just writing to ask the pro's and con's of swapping my current carb set up (38DGAS) for a bike carb set up. I've surfed the web looking at different views, so i thought i'd put the question straight to yourselves.
If any of you have experianced either set-up or has a point of view, i would valve your feedback.
Many Thanks
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sparkyt
Posted a lot
selling stuff
Posts: 1,767
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Jul 24, 2012 22:57:45 GMT
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My penny would say its going to come down to how they are going to be used
I'm told bike carbs work at the best with high flow rates as they see very high rpm on a bike but its a hole with a flap covering it not to far from an old Su .. (which work well on my moggie at very low flow rates .) .. the more I've looked in to this question the bigger the question gets .
I'd like to know the ans to this one too
I doo think twin webbers look cooler than bike carbs ...
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madmog
Club Retro Rides Member
Posts: 1,155
Club RR Member Number: 46
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38DGAS carb or Bike Carbs?madmog
@madmog
Club Retro Rides Member 46
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Pros of existing setup:
It's free - or maybe you need a rolling road to get spot on, it takes none of your time, it's a known quantity. Less rolling roads know how to set up bike carbs. Bike carbs mean getting a manifold fabricated. It already fits.
Pros of bike carbs:
Can be smoother _especially_ at low revs. Might be cheaper than say Webers particularly if you can do your own manifold fabrication. More information becoming available- not such a black art anymore. Can be turbo-charged later. Although more up-to-date than Webers they're not complicated things to pull apart and tinker with.
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Hi mate,
I've got bike carbs on my St170 engine and they work very well ;D when I first fitted them it took a long time for me to set up and get right. Now there working the engine pulls like a train ;D oh, They sound awsome!!
Stevie
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Copey
Posted a lot
Posts: 2,845
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Jul 25, 2012 10:44:13 GMT
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on my Capri i had a 2.1 pinto on a 38DGAS carb which i swapped for bike carbs...best thing i ever did, was LOADS more responsive, had more power, better noise, ran smoother, got rid of the flat spot when pulling off that you can get with a 38DGAS, also it would do 30mph in 5th, with the DGAS it didnt like doin 30 in 4th, it would judder about etc, the bike carbs actually retured better MPG too on a run and bimbling about, though if you hoof it they do like a drink hehe...oh and the induction roar...mmmmm
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1990 Ford Sierra Sapphire GLSi with 2.0 Zetec
1985 Ford Capri 3.0 (was a 2.0 Laser originally)
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Jul 25, 2012 13:13:35 GMT
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we did a 1600 cvh orion on a 1400 gearbox, cam and head work and was great fun to drive. noise was brilliant but we should have gone for bigger carbs. opened the jets out and set it up, got the air fuel ratio spot on on the rollers and still only made 110hp.
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Its not broken, its resting!
Max signature image height: 80px
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mikeymk
Part of things
'85 Polo Coupe S 1.6 16v
Posts: 931
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Jul 30, 2012 11:59:45 GMT
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I fitted bike carbs several years ago, and never looked back. More performance, better economy, better sound, and all these things were in spades. I've done a few engines, 1.4 8v, 1.6 8v, couple of 1.6 16v engines, they're superb. But you need to get them set up properly and you need to use the right size carbs - 36mm venturis are plenty for a 1.6 you want 130bhp from. Having all four cylinders trying to snatch the fuel/air mixture back/fourth in a shared 4-1 manifold is madness. It's inconsistent, slow and clumsy. I'd never run a shared carb again. Having a small carb for each cylinder is far more efficient in itself, but on top of that, flat slide bike carbs are self regulating. Unlike car carbs, a 38mm bike carb is not 38mm at low revs, even if your foot is on the carpet. They maintain high air speed at all times, so even at low revs you have high mixture swirl/atomisation through high air intake speeds in the venturi. This makes even twin 40s old and clumsy. And explains why they're inferior. Well bike carbs are far more advanced - mine are from one of Hondas finest sports vehicles sold just 12 years ago! Car carbs were history ten years earlier. Throttle response is epic, transforms the car, making it feel so alive. So absolute power figures are almost irrelevant on a road car. These are 36.5mm CBR600F-X carbs, i've had economy figures on a 1.4 i won't claim for ridicule, nor will i claim how quick a 1.6 16v was, but the noise? I'll claim it sounded better than anything i've ever heard on the cammed 1.6 8v. Showstopping sound. I tried 38s from a 900 but these were just a bit better to use.    |
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