speedyxjs
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| posted on 4/3/09 at 08:24 PM |
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Carbs - Which ones to buy?
Im looking at SU carbs on fleabay but have noticed there are different types.
Im planning on modifying my current (EFI) manifold to use on my 3.6 and wanted to make sure that getting twin SU's off a 4.2 Series 3 XJ would
be up to the task 
How long can i resist the temptation to drop a V8 in?
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James
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| posted on 4/3/09 at 11:00 PM |
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Your fuel economy is going to be bad enough... don't you want EFI to maximise it?
Cheers,
James
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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02GF74
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| posted on 5/3/09 at 08:13 AM |
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what's the engine, make/model./year - I have SU books so can take a look and tell you what was fitted at factory.
from memory the 6 cyl jags had twin 2 inch SUs, I think the E-type had triple 2 inch.
oh, just remembered, go over to burlen.co.uk - the peeps who took over SU - they have online application page where you can enter ^^^^ info. - saves
me remembering and looking in my books - it may be more up to date too.
[Edited on 5/3/09 by 02GF74]
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britishtrident
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| posted on 5/3/09 at 08:24 AM |
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I don't think it will work
(1) Jag SU carbs have no cold start facility, so you would need to fit the electrically operated SU cold start enrichment carb and its thermal switch.
(2) Your manifold won't be water heated so the above won't work properly.
Megasquirt or micro squirt it.
[Edited on 5/3/09 by britishtrident]
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speedyxjs
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| posted on 5/3/09 at 09:01 AM |
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The engine is a 3.6 AJ6
I want to have it on carbs as it looks so much nice imo.
Fuel economy??? Who cares, the car wont be used much anyway (plus i have a 50l tank  ). Anyway, i want to encourage global warming so i have nice
weather to drive in
ETA - i thought about megasquirt for it (i read that some bloke up north megasquirted a 4.2 Etype and is getting 48mpg combined  ) but it looks quite
expensive, confusing and teh horror stories i have read about locostbuilders trying and failing to set it up.
[Edited on 5-3-09 by speedyxjs]
How long can i resist the temptation to drop a V8 in?
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britishtrident
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| posted on 5/3/09 at 09:57 PM |
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Sorting out a Mega Squirt is nothing compared to trying to find the most suitable SU carb needles ---
[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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paulf
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| posted on 5/3/09 at 10:31 PM |
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You could always use the SUs as throttle bodys and discretely fit a set of injectors.
It is much easier to set up injection with an AFR meter and PC than having to guess at different needles and springs etc.
Paul.
quote:
Originally posted by speedyxjs
The engine is a 3.6 AJ6
I want to have it on carbs as it looks so much nice imo.
Fuel economy??? Who cares, the car wont be used much anyway (plus i have a 50l tank ). Anyway, i want to encourage global warming so i have nice
weather to drive in
ETA - i thought about megasquirt for it (i read that some bloke up north megasquirted a 4.2 Etype and is getting 48mpg combined ) but it looks quite
expensive, confusing and teh horror stories i have read about locostbuilders trying and failing to set it up.
[Edited on 5-3-09 by speedyxjs]
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coozer
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| posted on 5/3/09 at 10:37 PM |
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What about bike carbs? Same principle as SU's but easier to setup and better mpg...
1972 V8 Jago
1980 Z750
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ss1turbo
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| posted on 6/3/09 at 07:04 AM |
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quote:
Originally posted by coozer
What about bike carbs? Same principle as SU's but easier to setup and better mpg...
It'd look like the underbonnet of a TVR Speed Six..
The injectors-inside-carbs has been done a couple of times by people who want the "factory" look. Think there's an MGC somewhere
that had a pair of SU's as throttle bodies, but port injection. A nice tidy cover over them and you'd think it was carb'd unless
you looked very closely.
The only HS8's i can think of with a cold start/choke on them are those from a Rover 2000TC (robbed for many a Dolomite Sprint). Jag and
RollsRoyce ones came with an AED (effectively an additional, very rich carb which chucked even more fuel in when cold) from memory.
I'd keep injection, but try and hide it; then use a couple of SU's just to throttle the air...
Long live RWD...
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speedyxjs
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| posted on 6/3/09 at 08:48 PM |
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Ok, what bike carbs are best?
How long can i resist the temptation to drop a V8 in?
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