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| Home > General Chat > Dual Weber 45's on Mini - Possible? | |||||||
 106 Posts Member #: 9354 Advanced Member |
18th Dec, 2011 at 04:50:56pm
Hi everyone,
Apparently, I'm Wrong :[ |
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 12307 Posts Member #: 565 Carlos Fandango Burnham-on-Crouch, Essex |
18th Dec, 2011 at 04:52:44pm
http://uploads-preloved.com/uploads/userph...932570-826m.jpg On 28th Aug, 2011 Kean said:
At the risk of being sigged... Joe, do you have a photo of your tool? http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1 https://joe1977.imgbb.com/ |
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 1648 Posts Member #: 9038 Post Whore Carlisle, Cumbria |
18th Dec, 2011 at 05:10:38pm
as in the picture joes posted, you use a choke from each weber rather then all 4. One of then has to be chopped for them to fit on the inlet manifold. And of course a very large bulkhead box too. |
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 684 Posts Member #: 9590 Post Whore Derby |
18th Dec, 2011 at 05:12:20pm
Split webers? Not sure what size they are but 40's would be fine im sure 45s would be too big and youd just choke them down anyway. No benifit really.
Matt W
On 14th Mar, 2012 mw3 said:
Got a nice big delivery from Carl at Force Racing today. |
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106 Posts Member #: 9354 Advanced Member |
18th Dec, 2011 at 07:31:30pm
It seems a bit peculiar to use 2 webers that way; i cant understand where is the advantage when you do not utilize both webers.
Apparently, I'm Wrong :[ |
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 62 Posts Member #: 9439 Advanced Member stoke on trent |
18th Dec, 2011 at 07:44:27pm
Straightens the inlet tract to reduce the two outside cylinders from running rich. |
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Forum Mod  5933 Posts Member #: 784 9 times Avon Park Class C winner Milton Keynes |
19th Dec, 2011 at 06:22:55am
The theory of split Webers is very good but on a top notch race head they give less power than a normal 45 I seriously doubt it! |
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 7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
19th Dec, 2011 at 09:52:52am
On 19th Dec, 2011 paul wiginton said:
The theory of split Webers is very good but on a top notch race head they give less power than a normal 45 Why could this be? On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem. |
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318 Posts Member #: 9408 Senior Member Tiptree, Essex |
19th Dec, 2011 at 12:31:02pm
The reason for splitting them is because one side of a single Weber runs fractionally more rich than the other, so you get better mixture across the 2 inlet ports with split Webers, also you have double the capacity of fuel in the float chambers which reduces the chance of starvation (though I doubt it's really an issue with A series fuel consumption) www.topcatcustom.co.uk |
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 3673 Posts Member #: 9300 Post Whore Quarry Bonk |
19th Dec, 2011 at 12:34:19pm
Well, i wouldve thought that doing that, youre reducing the inlet length, which is partly where everyone seems to think webers are a 'better carb' due to the inlet length being longer than your standard inlet manifold. I'm led to believe it produces slightly better torque.
On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!! 17.213 @ 71mph, 64bhp n/a (Old Engine) |
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 580 Posts Member #: 9580 Post Whore Surrey |
19th Dec, 2011 at 01:51:05pm
2p worth - I thought it was something to do with fuel surge. Having 2 seperate carbs means there's nowhere for the fuel to go other than where its ment to in the correct mixture. |
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Forum Mod 5933 Posts Member #: 784 9 times Avon Park Class C winner Milton Keynes |
19th Dec, 2011 at 04:48:16pm
On 19th Dec, 2011 Vegard said:
On 19th Dec, 2011 paul wiginton said:
The theory of split Webers is very good but on a top notch race head they give less power than a normal 45 Why could this be? I really dont know Vegard, but we tested it back to back, also Swifty and Baldwin knew this before our testing I seriously doubt it! |
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684 Posts Member #: 9590 Post Whore Derby |
19th Dec, 2011 at 05:15:10pm
On 19th Dec, 2011 topcat said:
The reason for splitting them is because one side of a single Weber runs fractionally more rich than the other, so you get better mixture across the 2 inlet ports with split Webers, also you have double the capacity of fuel in the float chambers which reduces the chance of starvation (though I doubt it's really an issue with A series fuel consumption) The whole idea of split webers is to get a nice straight inlet to the cylinders. How does one side of the carb run richer than the other when there identical in every respect, other than being handed. I dont see how this is so? If you have trouble with fuelling you get bigger needle valves to give you more fuel flow. webers are capable of flowing a lot of fuel through the body to cope with burning methanol because you have to use 40% more methanol to produce the same power. So i doubt youll get fuel starvation. Matt W
On 14th Mar, 2012 mw3 said:
Got a nice big delivery from Carl at Force Racing today. |
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 6752 Posts Member #: 828 Post Whore uranus |
19th Dec, 2011 at 05:20:38pm
On 19th Dec, 2011 Vegard said:
On 19th Dec, 2011 paul wiginton said:
The theory of split Webers is very good but on a top notch race head they give less power than a normal 45 Why could this be? with a lean condition at no 1 and 4 when carbureted,,then anything that bias's the fuel flow to the outer cylinders may obviate this ,and create a more even mix across the 4 cylinders ,so making it possible to run each cylinder nearer to the best power producing mixture . a straight shot from twin webers would be pretty central to the port and so not create more fuel to the outers ,, a single weber ,with its carb ports narrower than the two inlet ports would PERHAPS bias heavy fuel droplets outwards towards the outer ports . and so create richer outers than the twin webers ,and so make more power ,since the mixture spread across the 4 cylinders is more even . a very simple explanation ,which may be nonsense ! regards robert Edited by robert on 19th Dec, 2011. Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM |
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Forum Mod 5933 Posts Member #: 784 9 times Avon Park Class C winner Milton Keynes |
19th Dec, 2011 at 05:32:36pm
As you say Robert, the theory is to get a more even amount of fuel to each port, but in practice it gives less power throughout the full rev range I seriously doubt it! |
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12307 Posts Member #: 565 Carlos Fandango Burnham-on-Crouch, Essex |
19th Dec, 2011 at 05:33:37pm
also, what length manifolds are we talking about... all the split weber ones I have seen have been short, about 4" max, On 28th Aug, 2011 Kean said:
At the risk of being sigged... Joe, do you have a photo of your tool? http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1 https://joe1977.imgbb.com/ |
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Forum Mod 5933 Posts Member #: 784 9 times Avon Park Class C winner Milton Keynes |
19th Dec, 2011 at 05:37:01pm
Admitted our testing was on shortish Longman manifolds which are supposedly the best and was tested against a 3.5" normal manifold I seriously doubt it! |
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3673 Posts Member #: 9300 Post Whore Quarry Bonk |
19th Dec, 2011 at 05:38:42pm
Part of what i was trying to explain to myself joe, The single weber has a longer inlet length than the split weber does or a single SU. Which often makes people think a Weber is a better carb as such, although its just easier to tune. Makes sense in my head at least.
On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!! 17.213 @ 71mph, 64bhp n/a (Old Engine) |
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6752 Posts Member #: 828 Post Whore uranus |
19th Dec, 2011 at 05:51:42pm
hmm , the valve to bellmouth end dimention would have to be the same to get a good test . Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM |
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684 Posts Member #: 9590 Post Whore Derby |
19th Dec, 2011 at 05:57:10pm
1 and 4 are always going to be weaker though? Because they immediately follow the inner cylinders. The charge has to change direction to flow to the outer cylinders so the cylinder filling isnt going to be as good.
Matt W
On 14th Mar, 2012 mw3 said:
Got a nice big delivery from Carl at Force Racing today. |
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 8604 Posts Member #: 573 Formerly Axel Podland |
20th Dec, 2011 at 04:21:36pm
If everything else is equal, then just an inch shorter total inlet runner length will give less power over part or even the entire useable rev range. Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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Forum Mod 5933 Posts Member #: 784 9 times Avon Park Class C winner Milton Keynes |
20th Dec, 2011 at 04:38:43pm
But torque should be higher and it wasnt Edited by paul wiginton on 20th Dec, 2011. I seriously doubt it! |
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7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
20th Dec, 2011 at 06:37:04pm
Twin 45s are easy though:
On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem. |
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4314 Posts Member #: 700 Formerly British Open Classic The West Country |
20th Dec, 2011 at 07:17:50pm
Sorry to be pedantic but these are not twin 45s:
if fact they're not even Webers Edited by Rob H on 20th Dec, 2011. Isambard Kingdom Brunel said:
Nothing is impossible if you are an Engineer |
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7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
20th Dec, 2011 at 07:33:27pm
Oops. Wrong link :) On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem. |
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