Slide carb or diaphram carb?

[pepperami]

So your putting together a little project bike and you have two carbs that match the inlet mounting rubbers.
As said in the title, one is a diaphram and the other is a good old slide type carb.
Both come from an engine of similar capacity as the one you`ve got in your project bike.

What one would be the choice to fit and why?
Is one more responsive?

C`mon mighty BCF, enlighten me
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[The Shaggy D.A.]

Personally I'd go for the simplicity of a slide carb, easier to debug if there's a problem.
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[temeluchus]

slide carbs are simpler for the home tuner to set up so I would go for that one.
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[Fizzer Thou]

It depends on what the engine is.If you have a slide type carb,the opportunity to yank the throttle open too quickly and the engine bogs is quite high.If the slide carb has an accelerator pump on it this will help,but it does take some setting up to get the length of squirt correct.Whereas with a CV type carb,the slide will only open as quickly as the engine builds revs.If everything works okay on a CV carb then there should be no problem with performance.
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[temeluchus]

[pepperami]

I`ve got diaphram carbs on my XS400 and on my Sachs 125 and they both are a pain in the bum when they need working on.

That got me thinking about some of my previous bikes that had slide carbs= Suzuki GT 250`s, RD`s, Pursangs, & CB125 twins, none of which gave me much hassle carb wise.

They all "felt" responsive? and quicker to "pick up" when I compare them against my XS400 & Sachs125 ?
Or am I looking at past bikes with rose tinted glasses?

Is there any substance to what I`m saying?
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[temeluchus]

cv carbs can be great but again stick to slideys for home brewing. as you have experienced they are easier to work on.
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[hmmmnz]

i have both diaphragm and slide carbs for my 500cc single, ive had far better luck with the diaphragm carb, the slide carb definitely isn't as forgiving
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[Ariel Badger]

For speed on the track a slide, for reliability and steadiness on the road a CV.
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[Ingah]

[Teflon-Mike]

First question; TWO STROKE OR FOUR STROKE!
I know not of a successful application of CV carb on a two stroke. This suggests, CV carbs dont work too great on them.
If four stroke.
Single, twin or Multi?
If multi, are you using multiple carbs or manifolding?
What is the displacement of the engine?
Big engines with big slide carbs can suffer slide sticktion; botterly on a CV makes them a lot lighter aginast the large vacuum of a big pot at part throttle.
Whats the NATURE of the engine? screamer, or slogger?
Is it tuned for power or ecconomy?
Whats the desired USE? Racing, carburation can be set up digitallyl throttle's slam shut or wide open. Trials we like rather a lot more finesse in the part throttle and throttle response. On the road, tend to want some measure of both, plus ecconomy.

NOT exactly giving us much to go on here!

And you have myriad deifferent designs and arrangements of CV carburettor...... Brian Kryten, got great results ditching the Mikuni Flatslides on the Norton Rotary Racers in favour of 'old fasioned' SU carbs of a frigging Morris Monor! Press called hium a luiddite for that one AND making Spondon weld up a twin shock frame..... but he started placing bikes in races!

So WHAT is the 'Little Project Bike'? And whats the actual carbs....
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[pepperami]

WHOA! Mr Tef!
Ok I am in the process of seeking out a new project possibly? I hope? maybe? if I`m allowed? (she who must be obeyed)

And I have decided that it will be one of the following 1. a two-smoke twin, 2. a two-smoke single, or 3. a four-stroke single.

It will be above 125cc and below 400cc.
why I am asking these questions is that I want to get the best out of my project, but I do not want to go down the road of "tuning" the living daylights out of it.

I am not affraid of a two-smoke twin with two carbs or putting a different/bigger carb on a smoker that has a single carb on a manifold to two cylinders.
As for four-strokes, Im still convinced that the "safe" settings that carbs are set up with by the makers takes a bit of the pep out of the engine?.

I seek your wisdom
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[Teflon-Mike]

[pepperami]

[Kickstart]

Hi

CV carb is more idiot proof but harder to set up. Slide carb is easier to set up but relies on some care from the rider.

Unless the CV carb was pretty close to the right setting for that bike I would use the slide carb.

All the best

Keith
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