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Triple SU setup help please

Started by _penske61_ , Jul 06 2014 08:24 PM

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55 replies to this topic

#1 _penske61_

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Posted 06 July 2014 - 08:24 PM

Hi, picked up a set of triple su's this weekend.

I have attached a photo, can someone please have a look and see if anything sticks out that is wrong or missing on them.

I have trolled the net but can't find many decent photos of LJ's with SU's, mainly xu1's with strombergs.

I got these to replace my twin downdraught strombergs.

Questions:

1/ Is it worth kitting and fitting these or should I just rebuild what I have?

2/ Do I have to change the throttle from linkage to cable?

3/ I can't see where to put the choke on them?

4/ Do I need to move anything, i.e. the battery?

I really want triples, (mainly for the look!), but it is a relatively mild 202, and if it is going to be $$$, then maybe I should fix my daughters wisdom teeth instead.

Any comments or tips greatly appreciated (not about the daughter)

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#2 _oldjohnno_

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Posted 06 July 2014 - 09:01 PM

It'd be much easier if we could see the photo.

It's damn near impossible to give an opinion on her wisdom teeth without seeing them.

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#3 rodomo

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Posted 06 July 2014 - 10:35 PM

Where in Melb?

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#4 _Lazarus_

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Posted 06 July 2014 - 11:04 PM

You really need a dentist who specialises in carburetors.

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#5 _penske61_

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Posted 06 July 2014 - 11:08 PM

triple su's.jpg 117.58K 37 downloads

Hmm, IT not my strong point.

I am in Geelong 65 km South of Melbourne.

Thanks

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#6 _judgelj_

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Posted 07 July 2014 - 02:44 PM

Hi, picked up a set of triple su's this weekend.

I have attached a photo, can someone please have a look and see if anything sticks out that is wrong or missing on them.

I have trolled the net but can't find many decent photos of LJ's with SU's, mainly xu1's with strombergs.

I got these to replace my twin downdraught strombergs.

Questions:

1/ Is it worth kitting and fitting these or should I just rebuild what I have?

2/ Do I have to change the throttle from linkage to cable?

3/ I can't see where to put the choke on them?

4/ Do I need to move anything, i.e. the battery?

I really want triples, (mainly for the look!), but it is a relatively mild 202, and if it is going to be $$$, then maybe I should fix my daughters wisdom teeth instead.

Any comments or tips greatly appreciated (not about the daughter)

The triples look nice, actually. They could be a lot worse (visually).

1. Honestly, probably not worth it. Unless the butterfly shafts are in good nic and not worn. If that's a case, re kit them, otherwise you will be up for re bushing. That will run you around 350 per carb including the re kit, at least that's what it cost me. The problem is that a lot of them are worn and tend to be a bit leaky, hence the ignorant feedback towards them.
2. Depends, what throttle setup do you currently have?
3. Choke should be near the throttle leaver or opposite side (cant picture it) and will lower the jet (underneath) when you operate it. But you don't really need it, i've never used a choke.
4. Not in an LJ, but would look a lot better with out it. It may perhaps limit what sort of air filter assembly you use.

Also, i can't tell what they are they have funny fuel pots. See if you can find any writing on them, should read like HS6 or something. Let us know.

If you check out the link under this post, go to the end of that build thread and there should be a shitload of photo's with my SU's in the LC. Feel free to PM me anytime if you need help. Im not far from werribee.

Edited by judgelj, 07 July 2014 - 02:46 PM.

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#7 _Bomber Watson_

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Posted 07 July 2014 - 06:57 PM

I agree with the above.

To elaborate, the "funny fuel pots" are early styel fuel pots. The carbs look like 1 3/4", so you actually have a pretty rare set.

The fuel pots you have bolt directly to the bottom of the carb, unlike the later ones that myself and Judge have which have a silly tiny rubber hose. THe ones you have will flow more fuel, and are more suited to alchol type fuels if you chose to use them (E-85 anyone?)

Now, you currently have twin downdraughs i assume? These are ok. The SU's will be way nicer to drive once kitted properly and dialed in. You will get better fuel economy, way better mid range torque due to the CV arrangement, and possibly slightly better top end.

Trust me, i went from reasonably well set up twin down draught strommies to no where near dialed in tripple 1 and 3's and had an instant improvement.

As Judge said the throttle shafts are a biggie. If there not right the carbs will never be any good. I think mine were a fair bit cheeper than what Judge quoted, but it was about 8 years ago. A lad in Sydney did them for me with Nylon bushes, Louie was his name, he used to be a forum member but not sure if he still floats around, sadly cant help much more than that!!!

Edit, just looked at the picks again, they might be 2"? Hard to tell from that angle. Unbolt a carb and measure the throat at the back of it, just after the butterfly, and let us know.

If there 2" i might be interested, if you dont want to use them.

Cheers.

Edited by Bomber Watson, 07 July 2014 - 06:59 PM.

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#8 caterham2

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Posted 07 July 2014 - 07:53 PM

This is how a 2" SU setup looks like in an LJ XU1 engine bay. If the shafts in yours are good then rebuild with a kit of bits, fit them and get them setup PROPERLY. PM me for recommendations of who to do this. Like Bomber said these are good stuff, easily outperform fixed choke carbs. Despite all the nonsense you may hear about them going out of tune, it is just that , nonsense, invariably from the owners of worn out and incorrectly "jetted " setups. that they constantly "tune" in the backyard.The motor in the photo puts out around 250HP, is still reasonably driveable on the street, with fixed jet carbs I doubt if you could do this. AND NO BOMBER , YOU CAN'T HAVE THESE ONES LOL

Attached Files

torana engine bay.jpg 381.04K 75 downloads

Edited by caterham2, 07 July 2014 - 07:54 PM.

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#9 _Bomber Watson_

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Posted 07 July 2014 - 08:14 PM

I already have a set of 2" carbs, just they have the newer style float bowl, im interested in running E-85 so hunting for an old set

Cheers.

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#10 _penske61_

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Posted 07 July 2014 - 08:16 PM

Thanks for that info, how do I PM?

This is my current setup. I'm not a mechanic, so while I can do the easy bolt on bits I'm a bit bit concerned there are a few hoses running off the carbs and manifold that don't match up to the triple carbs and manifold. WP_000271.jpg 270.71K 19 downloads

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#11 _Bomber Watson_

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Posted 07 July 2014 - 08:24 PM

Purdy.

Which ones dont match up. Take a pick of each one and we will give you an idea where it goes.

Cheers.

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#12 caterham2

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Posted 07 July 2014 - 08:34 PM

I already have a set of 2" carbs, just they have the newer style float bowl, im interested in running E-85 so hunting for an old set

Cheers.

Bomber, just be a little careful with E85. The earlier type 2'' carbs in my photo have rubber diaphragms with the main jet attached to it, moved up and down for choke etc. On PULP with a dash of 105 boost that I run they go hard after a few years and they either resist choke movement or spring a leak over the exhausts with the resultant pyrotechnics unless you have a very large insulated heat shield like I have. The ethanol content in E85 I would imagine would be even MORE aggressive on gaskets and rubbers! This is free R and D for you obtained at considerable expense by me

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#13 S pack

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Posted 07 July 2014 - 08:41 PM

Purdy.

Which ones dont match up. Take a pick of each one and we will give you an idea where it goes.

Cheers.

He needs connections for the brake booster vacuum and the PCV valve hoses which i presume are the tubular shaped bosses cast into intake runners No 1 and 3 on the triple manifold.

Also needs a port for vac advance???

Edited by S pack, 07 July 2014 - 08:44 PM.

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#14 _Bomber Watson_

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Posted 07 July 2014 - 08:46 PM

Just looking at the origional pick it looks like all of the above (incl vac advance) is there, i was hoping to make it a bit easyer for him....

Cheers.

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#15 warrenm

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Posted 08 July 2014 - 12:03 AM

Those SU's look like 1 3/4" HD6's not 2" HD8's. Ram tubes leave a bit to be desired.

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#16 _judgelj_

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Posted 08 July 2014 - 08:24 AM

Whats the diff between HD6 and HR6?

OK picture alert!

Looks like the brass barb on the very end of the middle manifold runner will connect to your brake booster. Looks like this

Vac advance should be a little nipple pointing to the sky behind the carb where the manifold flange is.

Look closely to the far right you will see the nip.

Look closely to the far right you will see the nip.

Setup. Good battery clearance. Hopefully this helps you envision what they would look like in your engine bay.

Finished product. Take notice of the fuel lines and brake booster line.

You pretty much WILL need a fuel reg. I dont know how people get away with out them, otherwise fuel will start pissing out the bowls and jets if it idles for a while. They dont like more than 2.5 psi. And trust me, non crossflow+fuel leaking=fire. A nice inline gauge would look nice too. They do look like 1 3/4 going by the bell shape. Now i dont think i did anything for PCV. You may not have to depending on your setup.

Edited by judgelj, 08 July 2014 - 08:29 AM.

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#17 _oldjohnno_

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Posted 08 July 2014 - 09:52 AM

This is how a 2" SU setup looks like in an LJ XU1 engine bay. If the shafts in yours are good then rebuild with a kit of bits, fit them and get them setup PROPERLY. PM me for recommendations of who to do this. Like Bomber said these are good stuff, easily outperform fixed choke carbs. Despite all the nonsense you may hear about them going out of tune, it is just that , nonsense, invariably from the owners of worn out and incorrectly "jetted " setups. that they constantly "tune" in the backyard.The motor in the photo puts out around 250HP, is still reasonably driveable on the street, with fixed jet carbs I doubt if you could do this. AND NO BOMBER , YOU CAN'T HAVE THESE ONES LOL

This is nice - note the big, shared air filter, the individual return springs, the nicely done mechanical pedal linkage, hoses well secured and protected where necessary. Not a bad setup at all to copy.

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#18 warrenm

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Posted 09 July 2014 - 07:55 AM

The difference between HD6 & HS6 is mainly in the fuel bowl & the feed from the bowl to the jet. I don't have a HD6 to show, but have used a HD8 which is 2".

HS6 fuel bowl

20140708_094547 (600 x 450).jpg 81.24K 13 downloads

HD8 fuel bowl

20140708_094253 (600 x 450).jpg 59.85K 17 downloads

HS6 float which is usually plastic & doesn't like much fuel pressure, 3psi tends to overflow the bowl with any more. 20140708_103440 (600 x 450).jpg 75.86K 7 downloads

HD8 float which can handle a bit more pressure, & the float level can be adjusted easier which is limited with the HS6 arrangement.

20140708_095457 (600 x 450).jpg 82.41K 8 downloads

The fuel feed in the HD8 is approx. 6mm which is good for alcohol based fuels, & the HS6 uses a 4mm tube which is probably big enough but the plastic fittings that it fits over is much smaller & becomes to fragile when drilled out.

20140708_094627 (600 x 450).jpg 71.32K 12 downloads

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#19 _penske61_

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Posted 10 July 2014 - 10:16 PM

Thanks everyone, very good info.

I'm sure I'll be back on line when I've fitted them and have teething issues, but this will get me going.

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#20 EunUCh

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Posted 11 July 2014 - 10:38 AM

They do look like the HD series.

HD4 = 1 1/2 thrtl.bore

HD6 = 1 3/4 thrtl.bore

HD8 = 2 thrtl.bore

The HD4&6 and some HD8 series was fitted with spindle sealing glands.

Overhaul and gasket packs may be hard to get but these are the numbers for them.

HD4 gasket pack AUE805s overhaul pack AUE855

HD6 as above. as above

HD8 AUE806s AUE857

The "s" indicates that throttle plate screws are included.

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#21 _judgelj_

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Posted 11 July 2014 - 10:40 AM

come back when it looks like this (with su's instead of cd's, obviously)

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#22 SA EH

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Posted 11 July 2014 - 08:46 PM

Lovely work of art...

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#23 warrenm

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Posted 11 July 2014 - 11:42 PM

Lovely work of art...

No, too much shiny to keep clean. :stirpot:

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#24 _judgelj_

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Posted 12 July 2014 - 12:01 PM

Puhleese. Mines just as shiny, and it only takes about 2 1/2 hours of polishing before each show!

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#25 Dave6179

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Posted 15 July 2014 - 07:27 AM

Your SUs look like Mk 10 Jag carbs, I had a set as my first triples. Good carb, only issue I found was finding the round cork gasket, from memory it was under the main jet??