SU Carburettor
#1
SU Carburettor
I am putting a carby kit through my twin su carbies in a 65 3.8 S Type. The kit I got is CRK217 . My carbies fitted to the car are different from drawing in kit and manual . Mine do not have this diaphragm.
MAIN JET AND DIAPHRAGM
MORE PRODUCT INFO
PRODUCT CODE: AUC8155
QUANTITY OF FIT: 2
Where can I find a drawing and why is mine different
MAIN JET AND DIAPHRAGM
MORE PRODUCT INFO
PRODUCT CODE: AUC8155
QUANTITY OF FIT: 2
Where can I find a drawing and why is mine different
Last edited by bendougy; 05-14-2016 at 05:11 PM.
#3
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#6
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#7
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#8
I think you have the float bowl on up-side-down there.
My Bentley has no diaphragm in it, there are two seals around the main jet, a cork one and one fibre one impregnated with graphite.
The main jet moves up and down on these seals allowing for the manual choke operation.
The mixture is also adjusted by adjusting the nut on the bottom of the carb where the choke rests up against when it is in its fully "off" position.
If someone has changed your carbs out for a different pair, it's going to be tricky to find which pair you have.
There should be an aluminum tab on the banjo bolt that holds the float bowl lid on.
The tab has the model number of the carb on it.
My Bentley has no diaphragm in it, there are two seals around the main jet, a cork one and one fibre one impregnated with graphite.
The main jet moves up and down on these seals allowing for the manual choke operation.
The mixture is also adjusted by adjusting the nut on the bottom of the carb where the choke rests up against when it is in its fully "off" position.
If someone has changed your carbs out for a different pair, it's going to be tricky to find which pair you have.
There should be an aluminum tab on the banjo bolt that holds the float bowl lid on.
The tab has the model number of the carb on it.
Last edited by JeffR1; 05-14-2016 at 08:45 PM.
#11
I've been mulling around on the SU carb site trying to find something with an H8 designation and with no diaphragm and the only thing I could find was for the XK120... ???
This of course has a manual choke, the 3.8S should have the thermostatic automatic choke and the additional starting carburetor running off the front carb.
Is yours automatic or did someone convert it to a manual choke ?
Parts for AUC 702 for Jaguar 1946 onwards XK 120 3442 cc - SU Carburetters - SU Carburetters
This of course has a manual choke, the 3.8S should have the thermostatic automatic choke and the additional starting carburetor running off the front carb.
Is yours automatic or did someone convert it to a manual choke ?
Parts for AUC 702 for Jaguar 1946 onwards XK 120 3442 cc - SU Carburetters - SU Carburetters
Last edited by JeffR1; 05-14-2016 at 09:10 PM.
#12
#13
I highly recommend that when your SU's are really worn and in need of a rebuild to NOT attempt a DIY as even all of the Z shops and performance shops send their clients SU carbs to "Z Therapy" they are the best shop to do it right and you will get carbs better than new and they can tailor the SU's with tailored jetting and other modifications for your specific needs. I have been into Z's for over 20 years and most DIY rebuilds are never close to the performance of pro's like Z Therapy. To me it is like the wood of a Jag you can get it half *** and better than it was but not where the pro's can get it to so why get aggravated and waste your time and money?
Welcome to ZTherapy.com
Welcome to ZTherapy.com
#14
#15
It looks like there is a way to adjust the mixture, but no way to choke it.
I've never seen that arrangement before.
I would either go with Primazs' recommendation, or contact Burlen Carbs and ask them.
Send them some pictures.
The only thing that I'm certain of is that someone put some carbs on your 3.8S that were not there when it was new, at least according to all the kits from Burlen.
I've never seen that arrangement before.
I would either go with Primazs' recommendation, or contact Burlen Carbs and ask them.
Send them some pictures.
The only thing that I'm certain of is that someone put some carbs on your 3.8S that were not there when it was new, at least according to all the kits from Burlen.
Last edited by JeffR1; 05-15-2016 at 04:53 AM.
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#16
I found this from Burlen.
I went through all of the Jaguar listings and this isn't supposed to fit any jaguar, but it's the only one that appears to match your picture. It's model number is simply SU H6, and it has the typical starting (choke) carb off to the side that runs off the front float bowl.
Strangely through all the searching, I found this model on the XK 120 and 140 _ which isn't supposed to be on there either.
You need to contact Burlen and sort this mess out.
Rebuild Kit - For a Single H6 Thermo Carburettor - SU Carburetters
I went through all of the Jaguar listings and this isn't supposed to fit any jaguar, but it's the only one that appears to match your picture. It's model number is simply SU H6, and it has the typical starting (choke) carb off to the side that runs off the front float bowl.
Strangely through all the searching, I found this model on the XK 120 and 140 _ which isn't supposed to be on there either.
You need to contact Burlen and sort this mess out.
Rebuild Kit - For a Single H6 Thermo Carburettor - SU Carburetters
Last edited by JeffR1; 05-15-2016 at 07:33 PM.
#17
#18
However the ones you have are a PIA to adjust the mixture, the H8's have a slot screw that's accessible from the top of the carb as apposed to reaching down below with a wrench or in you case, a flat blade stubby screw driver.
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#20
The ones on Bendougies car are H-6 (as far as I can tell after searching around, there is no letter "D" in the designation number).
The main jet has no diaphragm on Bendougies carbs while if you look closely at the ones in your screen shot, the bottom end houses a diaphragm that the main jet is attached to - his is absent on Bendougies carbs _ that in which is the problem.
If you look at the bottom end in my screen shot on post 16, you can see they are very different.
But yes, you're right, there certainly nothing to stop Bendougy from fitting some HD-6 carbs as long as he changes the main jet needle to suit the 3.8 litre displacement.
Of all the carbs that I've worked on over the years, I think SU carbs have the most variations of design _ there are way to many different models just to do the same job.
Last edited by JeffR1; 05-16-2016 at 09:31 PM.
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NBCat (05-17-2016)