jamestziros
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| posted on 2/6/08 at 01:19 PM |
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flooded carbs
Almost finished building a locost CBR1000 but having problems with the float chambers overflowing at high revs. I am running an MGB fuel pump but
suspect, as I have read on this forum, that the pressure it delivers is too high (the pump is an interupt type).
Does anyone know what pressure a cbr1000 carb system should run at?
Would I be able to correct the problem with an off the shelf regulator?
Thanks!
James
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locosaki
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| posted on 2/6/08 at 01:28 PM |
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Hi mate,
I had to fit a bike pump to my set up (zx10) as the pump I orginally had was producing to much pressure and causing the carbs to flood.
I'm sure the bike pump runs at 2/3 psi max.
As for the regulator,I have no idea !!
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britishtrident
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| posted on 2/6/08 at 02:43 PM |
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If it was purely a fuel pressure problem it would occur at idle not high revs.
I suspect the root cause may actually be a carb vibration problem check your carb antivibration mountings are as the engine manufacturer intended.
It may also be you have fitted a high pressure pump, different springs are available for SU pumps you could try fitting spring part number AUA1449
which is avialble from Burlen Services for about £1.50 + vat & p&P
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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BenB
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| posted on 2/6/08 at 04:48 PM |
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99% of problems when running engines fitted with bike carbs go away when the proper fuel pump is fitted.
Although it should be possible to "adjust" the fuel pressure etc of a car fuel pump it's simplest just to fit a bike fuel pump.
Cheap as chips anyway....
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piggy1600cvh
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| posted on 2/6/08 at 04:57 PM |
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is this the same with a zetec engine running on bike carbs? should i use a bike pump or a car pump?
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jamestziros
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| posted on 3/6/08 at 07:45 PM |
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Cheers for the feedback chaps, I have a 1 5 psi regulator which I will try and also I will try to get a bike pump.
James
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jamestziros
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| posted on 8/6/08 at 05:54 PM |
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Chaps
I am still having problems with my carbs flooding. Here is the situation:
1. I have tried using a 1 - 5 psi regulator with the MGB fule pump - carbs still flood.
2. Tried a friends bike fule pump, he is using on a BEC 900cc fireblade - still floods.
3. Cleaned the carbs out & adjusted the float so it closes earlier than before - still floods.
The engine is set so the sump is level, even if i take the carbs off & change the anlge they sit they still flood.
I am taking the carbs to a bike place tomorrow to see what they say.
If anyone has any more ideas I'd love to hear.
Cheers
James
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