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special k
Member
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Posted: Monday September 24th, 2007 11:17 am |
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Hi Guys,
What is your opinion on converting from SPi to carbs?
Is it an easy conversion, does it need to be done by a specialist or is it something that i could have ago at?
Steve
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taffy1967
Member
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Posted: Tuesday September 25th, 2007 10:36 pm |
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I don't think it's an easy task (I hear that it's virtually impossible on the Twin-Point Minis?).
But why do you want to switch to a carb?Last edited on Tuesday September 25th, 2007 10:47 pm by taffy1967 |
special k
Member
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Posted: Wednesday September 26th, 2007 09:03 am |
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Hi taffy,
The idea came about during a chat with the guy who does the work on my mini.
He said it was agood thing to do as it would improve performance and do away with the array of sensors on an SPi
In my ignorance i know no better
Spesh
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taffy1967
Member
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Posted: Wednesday September 26th, 2007 09:40 am |
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The only real way it'll improve performance is if you then modify the engine. It is common knowledge that it's far easier to get more horses from a carburettor equipped Mini, because you just fit a larger carb or twin carbs to suit the modified cylinder head or bored out engine.
Simply switching from injection to carb isn't going to make any real difference, plus you'll then need to get used to running it with a choke again.
So unless you're going to seriously modify you're engine, the only benefit will be the fact that you won't have to worry about the ECU, Lambda Sensor, Crankcase Sensor or the Catalytic Convertor, because you should be able to do away with that too.
To be honest if you're Mini isn't broke then there's no need to bother.
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DaveShreeve
Administrator
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Posted: Wednesday September 26th, 2007 10:01 am |
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| It's possible but needs thinking about before progressing. You'll also need a proper distributor - all Spi timing is controlled by the ECU. You could also have problems with emissions. Unconfirmed info in previous threads suggests if you fit an older carb engine and advise DVLA you can run to the older engine emissions, modifying the Spi motor will leave you trying to achieve the emissions without the control.
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special k
Member
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Posted: Wednesday September 26th, 2007 10:15 am |
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Thanks for the reply guys, it is certainly nothing i was intending doing, untill it was suggested, but i am in agreement that it is probably not woth doing if all is ok.
The car is showing a worrying problem tho' and i wonder if that is why he suggested it.
He said a new engine temp sensor is needed as it struggles to run when first started up, once it warms up it appears to run ok...with the exception of a little problem.
When changing up into second from first the car really struggles as if its "missing" for want of a better description...or as if there is a momentary loss of power, almost like its running out of fuel!!
If i can keep it going and get up into third its ok, but it usually stalls in second.
I had a half hour drive to do last night so it was warm when i set off back, but it still showed the 2nd gear symptom...
Any views
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DaveShreeve
Administrator
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Posted: Wednesday September 26th, 2007 08:58 pm |
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Long shot but worth as check as it's not going to cost, or if it is the fault maybe a couple of quid.
Vacuum pipe from rear of manifold, via petrol trap, to ECU can cause all sorts of odd effects especially if rubber elbows have cracked. Might also be worth checking top engine steady bushes, if there's excessive movement it may be assisting any crack to open and close.
If you get down to Sheffield drop me a PM. My Spi is off the road at the moment so if you want to try substituting the temp sensor you could try mine.
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special k
Member
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Posted: Monday October 29th, 2007 05:56 pm |
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Thanks for the advice dave and the offer of trying your sensor.
If i ever get to Sheffield and yours is still out of action i will take you up on that.
I also did'nt realise the temp sensor was a separate item, thought it came as part of the throttle body. I understand they are a real pig to get to?
Steve
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