JONBEE
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 posted on 30/9/08 at 06:45 PM |
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TB'S/Bike carbs on 1275 A Series
Anyone know if fitting TB'S/bike carbs to a 1275 A series has been done?
If so, what parts were used, and was it succesful?
Would think they would have to be from a fairly small capacity bike..600/400.
NB: now i'm staying with the A series in the moggie, i have a MT75 rwd gearbox from a 1990 2.0 dohc sierra. mileage is unknown, but was told it
was very good when recently purchased. £40 ovno or will do a deal with a low mileage 1300 maestro engine, preferably with the ancillaries.
message me if interested, and i'll return my mobile number, unless i can call you.
thankyou
Jon
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mr henderson
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| posted on 30/9/08 at 06:49 PM |
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A series has siamesed inlet ports. TB's are usually used in one Tb per inlet port situations.
Unless you are constrained to use an a series engine, I would look for something more modern, plenty of better engines around. A series was good in
its day, but that day is long gone
John
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COREdevelopments
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| posted on 30/9/08 at 07:18 PM |
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keep the a series engine. get a k100 bmw 16v head to go on the a series block, has been done a few times. looks fab and will give you an 8port head,
lot of work done but worth doin if you want to keep it a series. there one in the new mini mag atm.
rob
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Syd Bridge
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| posted on 30/9/08 at 07:21 PM |
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For twin carbs, look under the bonnet of an MG Midget. Done years ago.
Bike carbs, or tb's with an ecu shouldn't be much of a problem to get working. The key is to use two injectors per inlet, and fire them
180deg apart. Easily done in Megasquirt as firing bank 1 and bank2.
From the racing experience, you should be looking for diams of about 42~45 mm.
Cheers,
Syd.
[Edited on 1/10/08 by Syd Bridge]
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paulf
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| posted on 30/9/08 at 07:22 PM |
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The A series wont work with fuel injection very well due to the siamesed port configaration causing charge robbing.
Basically the charge for one cylinder is partially taken by the other one of the pair causing them to run out of balance. Rover did inject one of the
later A series Minis but i think it was either single point injection or used a complicated management system.
A few people sem to have experimented with it, so a search on the megasquirt site may find more info.Even bike carbs would be a waste , the best
conversion seems to have been a single 1.75 inch SU.
David Vizzards book on tuning the A series is a good starting point and relevant to a lot of other engines also.
Paul.
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lsdweb
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| posted on 30/9/08 at 07:39 PM |
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This has been covered before and there a few web sites that'll explain how difficult it is because of the charge robbing.
I'll try and find the links.
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coozer
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| posted on 30/9/08 at 08:11 PM |
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Ring Bogg Brothers, they will advise and are very helpful.
They will give you the definitive advise
1972 V8 Jago
1980 Z750
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lsdweb
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| posted on 30/9/08 at 08:16 PM |
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Have a look here
and Dave Walker's article here
Wyn
[Edited on 30/9/08 by lsdweb]
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graememk
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| posted on 30/9/08 at 08:17 PM |
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quote:
Originally posted by COREdevelopments
keep the a series engine. get a k100 bmw 16v head to go on the a series block, has been done a few times. looks fab and will give you an 8port head,
lot of work done but worth doin if you want to keep it a series. there one in the new mini mag atm.
rob
wasnt the k100 8v the k1100 is 16v
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JONBEE
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| posted on 30/9/08 at 08:22 PM |
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TB'S/Bike carbs on 1275 A series
Thankyou all for the info.
Please enter any other info i could use to decide what i'm going to do, but at the moment sticking to tradition with the A series.
Jon
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udo
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| posted on 30/9/08 at 08:37 PM |
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Bike carbs on 1275 A series
Been member for a while but dont post due to not actually ever going ahead with a locost but still lurk for general info.
I have fitted 2 out of 4 R1 carbs to a 1293 A series see link below
http://www.theminiforum.co.uk/forums/index.php?showtopic=39131&hl=
Previously had a weber DCOE45 on in before but the R1 carbs were a lot better for low down torque with same top end power and better economy.
Have now moved onto the BMW K1100 16v head on a 1380cc A Series as mentioned above
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Phil.J
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| posted on 1/10/08 at 07:27 AM |
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You could be more adventurous and fit the 16 valve head from a BMW k series bike engine to the A series bottom end. Not a too difficult conversion,
Google it there's lots of info.
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iank
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| posted on 1/10/08 at 08:07 AM |
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The proof that the a-series can work with fuel injection is the MPI mini, but a normal ECU doesn't work very well.
The CANEMS ecu has special programming to deal with the siamesed inlets.
http://www.canems.co.uk/siameseports.php
The other option not mentioned so far is a 7 or 8 port head casting - not cheap but both give a port per inlet.
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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MikeCapon
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| posted on 1/10/08 at 09:38 AM |
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quote:
Originally posted by graememk
wasnt the k100 8v the k1100 is 16v
Grame is right. Most of the K100s were 8V heads. The only 16v heads on 1000 models were fitted to the K100RS1 16v and the K1.
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COREdevelopments
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| posted on 1/10/08 at 06:49 PM |
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yes graeme is correct, i did actually mean the k1100. my bad.
Rob
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