bricheun
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| posted on 2/11/06 at 06:43 AM |
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1600cc Honda - bike carbs - CVK40 or CBR600 F3s?
Engine : 1590 CC D16A6 with 272 cam.
I am going to get a manifold from Bogg Bros. Now the question is to whether to use the CBR600 F3s (35mm venturi) carbs or buy another set of R6 carbs
(40mm)..
Will the 4 X 35mm be adequate?
Any advice is much appreicated.
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oliwb
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| posted on 2/11/06 at 07:49 AM |
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I'm running zx7r's on my allegedly tuned 1600 pinto....38.5mm venturi's and they're running fine....would have thought 35 was
a little small and 40 a little large....Oli.
If your not living life on the edge you're taking up too much room!
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bricheun
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| posted on 2/11/06 at 08:49 AM |
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Thanks Oli..
The thing is I got the CBR600 F3 carbs for a bargain.
The standard dual carbs I have at the moment are the Keihin CV carbs with 2 35mm throttles. Would my theory prove correct that if I used 4 X 35mm each
port is now double the allowable flow?
Or, 1 X 35mm feeding 2 ports, but only 1 port is sucking at any one time is still 1 X 35 per port..I hope you understand what i am saying.
The car is pulling really well from 2000-6000 but sort of dies off after that, even with cam timing retarded it loses out in the higher rpm.
I hate to get the CBR600 F3s sorted out only to find it is still the same as the originial dual carbs..
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MikeRJ
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| posted on 2/11/06 at 09:50 AM |
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Compare the power output of the bike they came off to what you are expecting/hoping to achieve. This should give you an idea if they are within the
right ballpark.
You can't make carb/throttle body size much smaller simply because there is one per port. Whilst the average air flow is only a 1/4 of the total
engines requirements, the peak flow is about the same for a four cylinder engine.
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bricheun
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| posted on 2/11/06 at 10:14 AM |
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The engine in standard form is around 115bhp. With the 272 cam I am expecting around 130+..
The CBR 600 F3 were rated at around 100bhp..meaning I am well off target!..damn..
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Marcus
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| posted on 2/11/06 at 12:25 PM |
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I think you'll be alright with the F3 carbs.
Bear in mind that, if you went with a pair of Weber DCOEs, they (40s) would be running 32 - 34mm chokes.
Marcus
Because kits are for girls!!
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bricheun
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| posted on 2/11/06 at 03:38 PM |
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Right!!! It is not the thottle max opening right? It is the smallest part..I think it is 35mm, I suppose your F3s are also 35mm.
Steve at Bogg Bros said it will be ok...38..is also ok..and 40 is ok..they are able to get any carbs working :-)
Though I am in Hong Kong, I am coming back in Xmas to visit them and get the manifold fabbed up + a reject.
Great guy!
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bricheun
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| posted on 3/11/06 at 02:33 PM |
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+ rejet (typo)
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