mookaloid
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| posted on 20/9/10 at 12:00 PM |
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B series Bike carbs
A mate of mine has an MGB with knackered SU carbs.
Do we think it might be a reasonable option to fit a pair of bike carbs or are there other options?
Can't use 4 carbs as the inlet ports are siamesed like the A series.
Cheers
Mark
"That thing you're thinking - it wont be that."
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blakep82
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| posted on 20/9/10 at 12:09 PM |
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think bike carbs is a reasonable idea 
can't remember what the mini ports were like, but wouldn't that cause a problem with bike carbs? might need some strange and clever
manifold design?
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atspeed racing
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| posted on 20/9/10 at 12:36 PM |
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Bike carbs are complicated SU,s. Both do the same job. The reason people are using bike carbs is that they come bolted together with there own
linkage, SU carbs do not. However, there are manifolds and linkages for the Mini/SU combination easily available for you.
Use the SU. Infact I would recommend a single 1 3/4 SU carb for all road use. This carb will give enough BHP for most ROAD car use, and give very good
MPG.
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bartonp
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| posted on 20/9/10 at 12:41 PM |
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Rebuild kits for the SUs.
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mookaloid
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| posted on 20/9/10 at 01:11 PM |
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quote:
Originally posted by atspeed racing
Bike carbs are complicated SU,s. Both do the same job. The reason people are using bike carbs is that they come bolted together with there own
linkage, SU carbs do not. However, there are manifolds and linkages for the Mini/SU combination easily available for you.
Use the SU. Infact I would recommend a single 1 3/4 SU carb for all road use. This carb will give enough BHP for most ROAD car use, and give very good
MPG.
The engine in question has had a bit of tuning work and runs an uprated cam. Do you think the single 1 3/4" SU will still be enough to replace 2
x 1 1/2" SU's - it is a 1800 B series not an A series mini engine.
The 2 bike carbs idea was mainly for cost reasons (obviously I would need to pick some decent sized ones and lose 2 carbs off the bank of 4)
A single weber 48 is probably the way forward but it is very expensive...
Cheers
M
I think the current carbs are beyond a rebuild kit 
"That thing you're thinking - it wont be that."
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r1_pete
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| posted on 20/9/10 at 01:15 PM |
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How about something off one of the big twins, they tend to be a larger choke size...
What is wrong with the SUs
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mookaloid
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| posted on 20/9/10 at 01:39 PM |
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the SU's are just worn out - pistons, spindles everything really
[Edited on 20/9/10 by mookaloid]
"That thing you're thinking - it wont be that."
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atspeed racing
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| posted on 20/9/10 at 01:46 PM |
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Use a single SU.
This will give you all the power and drivability you will need for a road car, even with a camshaft. We have fitted many of our customers with this
setup and all are pleasantly suprised at the result. Even with a camshaft the "A" series will not pull peak power much beyond
6000/65000anyway.
Use the one from a Metro 1300 with a good inlet manifold and an LCB.
It works, I have proved it.
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mookaloid
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| posted on 20/9/10 at 02:09 PM |
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quote:
Originally posted by atspeed racing
Use a single SU.
This will give you all the power and drivability you will need for a road car, even with a camshaft. We have fitted many of our customers with this
setup and all are pleasantly suprised at the result. Even with a camshaft the "A" series will not pull peak power much beyond
6000/65000anyway.
Use the one from a Metro 1300 with a good inlet manifold and an LCB.
It works, I have proved it.
Not sure you have understood that this is a 'B' series engine are you saying that this is the answer for the MGB?
"That thing you're thinking - it wont be that."
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atspeed racing
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| posted on 20/9/10 at 02:24 PM |
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Think I will delete all my replies to you.....sorry.....
For this set up, you would need a 2inch SU from a Jag to get any benefit, but the twin
1 1/2 would be a good set up for the 1800MGB. We have tried the 45DCOE on the MGB without much success. It would appear that the MGB prefers SU carbs.
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westf27
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| posted on 20/9/10 at 02:44 PM |
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How about using the bank of four bike carbs and doing a two into one manifold to bolt to the original manifold.Not sure whether there would be enough
vacuum to pull through two carbs.
555
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atspeed racing
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| posted on 20/9/10 at 03:11 PM |
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I think the bank of 4 carbs could work, at the end of the day the carb will only open to what it needs. Although it has 2 inlet ports it is still
1800cc.
Could work. But there already is a manifold made for the 1800 "B" series.
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jacko
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| posted on 20/9/10 at 04:36 PM |
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Mark
Bogg brothers do a manifold for mini's and use 2 r1 carbs they remove the 2 middle carbs from the 4
there may be a photo on there web
Graham
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snapper
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| posted on 20/9/10 at 05:13 PM |
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There were manifolds for the B series that used twin 40's i.e. Two chokes into one siamesed inlet port, no reason why you could not make an
inlet manifold like that
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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snapper
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| posted on 20/9/10 at 05:20 PM |
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Looking at my MGB performance book they used 1 weber 45 or 48 or split webers, there was also a 32/36 DGV conversion and if you google MGB manifold
someone has done a twin throttle body conversion
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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