Discussion
jith said:
Jaguar steve said:
Huntsman said:
These look right to convert an AED car to a manual choke?
http://www.ebay.co.uk/itm/Rover-P6-2000-TC-CARBS-/...
Unlikely Rover/Triumph compatible variable jet carbs will even fit a XK manifold as IIRC the choke sizes and mounting stud pattern will be different, and even if they do actually bolt on they almost certainly won't be calibrated to accurately fuel a bigger capacity engine at part throttle nor will they be able to flow anywhere near sufficient air at wider openings. Different carburettors and engine vacuum conditions will also affect accurate vacuum ignition timing advance and retard.http://www.ebay.co.uk/itm/Rover-P6-2000-TC-CARBS-/...
If they are going dirt cheap it might be worth a punt just to see if it's possible to swap the manual choke components over - although I doubt it'll be possible - or make modifications to the original XK carburetors to get some form of manual operation working but you mess with air/fuel ratios and swapping or modifying carburetors at your peril and there's always the risk you'll end up running way too lean in certain conditions which eventually will kill your engine.
Without a proper rolling road set up and accurate exhaust gas analysis personally I'd not take the risk of running anything but the original carbs.
Edited by Jaguar steve on Monday 11th April 20:06
Ben, those carbs are identical to the one I converted last year and they are a steal at 50 quid. The only difference when these are fitted to a Rover is that the float chamber is on the same side of the carb body. This makes no difference whatever to the performance of the carbs.
The jets are identical to those in the Jaguar, but you have to use the needles from your old carbs to get the jetting correct. They are a straight fit onto the existing manifold and all you have to rig up is return springs and choke cables. There is a separate cable for each carb and they join together with a small junction box in the Rover. I usually contact Wadhams and buy a new Rover 2000 twin cable to make a job of it. Failing that you can use the twin cable setup on the S1 XJ12 if you can get your hands on one. Your original air cleaner also goes back on perfectly.
All you have to do after that is blank off the air intake on top of the manifold for the AED unit.
After you do this conversion and drive the car you wonder why the hell Jaguar bothered with the AED setup, believe me.
J
I wish I'd known that 25 years ago after spending a couple of Saturdays scrabbling round breakers looking for parts to do the same thing. I concluded with the pile of carb bodies and linkages I collected it just couldn't be made to work and even if it could the recollection of detonation melting piston crowns through entirely my own fault when I'd been playing round with mixtures and timing on modified engines put me right off further and I went down the AED overhaul and manual choke conversion route which worked well enough.
Good to hear for the OP there's a way round adapting AED carbs to fit a manual choke as that'll be the best long term solution.
Jaguar steve said:
You learn something everyday
I wish I'd known that 25 years ago after spending a couple of Saturdays scrabbling round breakers looking for parts to do the same thing. I concluded with the pile of carb bodies and linkages I collected it just couldn't be made to work and even if it could the recollection of detonation melting piston crowns through entirely my own fault when I'd been playing round with mixtures and timing on modified engines put me right off further and I went down the AED overhaul and manual choke conversion route which worked well enough.
Good to hear for the OP there's a way round adapting AED carbs to fit a manual choke as that'll be the best long term solution.
See my other thread, I think the best option might be a 4.2 injection motor from an S3...I wish I'd known that 25 years ago after spending a couple of Saturdays scrabbling round breakers looking for parts to do the same thing. I concluded with the pile of carb bodies and linkages I collected it just couldn't be made to work and even if it could the recollection of detonation melting piston crowns through entirely my own fault when I'd been playing round with mixtures and timing on modified engines put me right off further and I went down the AED overhaul and manual choke conversion route which worked well enough.
Good to hear for the OP there's a way round adapting AED carbs to fit a manual choke as that'll be the best long term solution.
I think the car has a pair of HS8's, its a 2.8ltr car, so are they 2"? I guess I need to check.
I got muddled and asked the seller to confirm they are HD8's which he has, so I'm not sure which they are.
I need to spend some time familiarising myself with what's under the bonnet.
Huntsman said:
Jaguar steve said:
You learn something everyday
I wish I'd known that 25 years ago after spending a couple of Saturdays scrabbling round breakers looking for parts to do the same thing. I concluded with the pile of carb bodies and linkages I collected it just couldn't be made to work and even if it could the recollection of detonation melting piston crowns through entirely my own fault when I'd been playing round with mixtures and timing on modified engines put me right off further and I went down the AED overhaul and manual choke conversion route which worked well enough.
Good to hear for the OP there's a way round adapting AED carbs to fit a manual choke as that'll be the best long term solution.
See my other thread, I think the best option might be a 4.2 injection motor from an S3...I wish I'd known that 25 years ago after spending a couple of Saturdays scrabbling round breakers looking for parts to do the same thing. I concluded with the pile of carb bodies and linkages I collected it just couldn't be made to work and even if it could the recollection of detonation melting piston crowns through entirely my own fault when I'd been playing round with mixtures and timing on modified engines put me right off further and I went down the AED overhaul and manual choke conversion route which worked well enough.
Good to hear for the OP there's a way round adapting AED carbs to fit a manual choke as that'll be the best long term solution.
I think the car has a pair of HS8's, its a 2.8ltr car, so are they 2"? I guess I need to check.
I got muddled and asked the seller to confirm they are HD8's which he has, so I'm not sure which they are.
I need to spend some time familiarising myself with what's under the bonnet.
J
The switch wasn't quite straightforward.
The Rover carbs had different spindles that wouldn't match the linkage on the car, so we had to swap a spindle, which entails some split screws that we decided to replace.
Float bowls foul the AED tube which we had to bend out of the way.
The needles and jets needed to stay as matched pairs, but the Daimler jets we're seized in the carbs,so we had to buy new jets and needles.
We still don't have a twin choke cable fitted, it needs to run through the bulkhead which seems to be a box section in the relevant area, but we do have two cars with linkages that lower the jets and open the butterflies a little.
Removed the LPG thing on the intake and fitted an air filter which had been missing.
At the same time we fitted a new dizzy, with electronic module, new coil, leads and plugs.
Overall a vast improvement.
We're getting there.
The Rover carbs had different spindles that wouldn't match the linkage on the car, so we had to swap a spindle, which entails some split screws that we decided to replace.
Float bowls foul the AED tube which we had to bend out of the way.
The needles and jets needed to stay as matched pairs, but the Daimler jets we're seized in the carbs,so we had to buy new jets and needles.
We still don't have a twin choke cable fitted, it needs to run through the bulkhead which seems to be a box section in the relevant area, but we do have two cars with linkages that lower the jets and open the butterflies a little.
Removed the LPG thing on the intake and fitted an air filter which had been missing.
At the same time we fitted a new dizzy, with electronic module, new coil, leads and plugs.
Overall a vast improvement.
We're getting there.
My 4.2 coupe has the manual choke conversion fitted.
It replaces the top of the original AED. I wouldn't say it's a masterpiece of engineering, although the car does start easily enough but needs a bit of throttle until it warms up.
Burlen services were supposedly developing an alternative to the AED but it doesn't seem to have materialised yet.
It replaces the top of the original AED. I wouldn't say it's a masterpiece of engineering, although the car does start easily enough but needs a bit of throttle until it warms up.
Burlen services were supposedly developing an alternative to the AED but it doesn't seem to have materialised yet.
Sorry to resurrect an old topic but I just converted my car to manual choke and completely go rid of the AED.
Works perfectly. Wish I'd done it ages ago instead of persevering with the AED.
So if anyone's interested I can post some pictures and hopefully it might be a help to others.
Dave
Works perfectly. Wish I'd done it ages ago instead of persevering with the AED.
So if anyone's interested I can post some pictures and hopefully it might be a help to others.
Dave
Wheelbrace said:
Sorry to resurrect an old topic but I just converted my car to manual choke and completely go rid of the AED.
Works perfectly. Wish I'd done it ages ago instead of persevering with the AED.
So if anyone's interested I can post some pictures and hopefully it might be a help to others.
Dave
Quite right. AED is fit for the bin.Works perfectly. Wish I'd done it ages ago instead of persevering with the AED.
So if anyone's interested I can post some pictures and hopefully it might be a help to others.
Dave
You posting on this thread reminded me when I sold my Daimler 2.8 i lost the best car I ever owned.
Mine was done for me by a chum, he sunk a lot of hours into it.
I bought a pair of manual choke 2" SU's from a rover P6, but its not totally straight forward swap, I only had the choke working on 1 carb, although that was enough.
I wouldn't put the effort into it again, I would go the whole hog and EFI, although that is a lot bigger job and a lot more £££ its also a huge gain.
I bought a pair of manual choke 2" SU's from a rover P6, but its not totally straight forward swap, I only had the choke working on 1 carb, although that was enough.
I wouldn't put the effort into it again, I would go the whole hog and EFI, although that is a lot bigger job and a lot more £££ its also a huge gain.
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