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Triple SUs

Started by smeer , Jul 15 2006 09:04 PM

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13 replies to this topic

#1 smeer

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Posted 15 July 2006 - 09:04 PM

lads.

I need a new carbie for my 161 block and I've decided on triple SUs.
At the moment I'm running the stock LC strommy.

I need a bit of advice regarding what to look for when I buy.

My biggest question is with the fuel lines and linkages. All the bits to bolt it on.
I won't be installing it myself, my mechanic will, but I want to supply all the required parts.

What should come with it?
What bits need to be in good condition, that can't be reconditioned/replaced
How easy is the bolt-on?

Finally.. Does anyone have a good set of 175s for sale?
Already rebuilt/in good running order is an advantage, but as long as they can be fixed, no problem. One piece manifold preferable. But I'll consider anything.

Thanks.

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#2 _draglc_

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Posted 15 July 2006 - 09:27 PM

hey mate, for a decet set, be prepared to pay close to $400, then youll need to maybe set aside another $100 for needles, seats, air filters, then more for the mechanic (hopefully he knows what hes doing) to tune, and select the right needles for your engine/application.

Heres a set i would consider, dont look like they need too much work, obviously new needles though, to suit your engine.

http://cgi.ebay.com....1QQcmdZViewItem

or a little cheaper, but may require a little more work..

http://cgi.ebay.com....1QQcmdZViewItem

Has your 161 had any work done to it? If not, maybe triple 1.75s are a little big, might look at getting something smaller like 1.50s. Triple 1.75s are good for a mildish to hot 202.

If its just a stocko engine, id just consider getting the original strommy overhauled, definetely a lot cheaper. If your looking a bit more power, pick up a mild 202, probably for the same price as a set of decent triples!

Andrew

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#3 smeer

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Posted 15 July 2006 - 10:06 PM

My block has been rebuilt with stronger internals, flattop pistons, bored 40thou. Lumpy cam, no porting.. just hardened valve seats. The engine is like new.. and goes a bit harder than it did before.
I considered swapping the engine out before the required rebuild (scratched bore) but I went with the rebuild. Guaranteed long life on the engine. I'd regret dropping in a poorly engineered home-built donk.

Hmm anyway, on topic.
The reason i want triple SUs is for sound and looks. I love em.
Full exhaust, better carbies and LSD is as far as im gonna take the running gear. I'm going for practicality, good looks and good sound. If i get a bit of power, bonus. I'm restoring the car stock standard all round.. except a few fun and tasteful tweaks (which can easily be swapped back..).
At the moment, I only drive this torrie on weekends as a cruiser.. not to go fast.

How much of a problem is having carbs that are too big?

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#4 _HB1200_

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Posted 16 July 2006 - 02:13 AM

I haven't seen tripples on a 161 before but based on your engine description a set of 175s would be too big. Your best bet, as above is to go for a set of 150s.

As far as linkages go there are many different setups. It would be easier to get a complete carb/manifold/linkage setup. Have a look around on this site or in magazines to get a feel for the different configurations and their components. When inspecting a set of tripples, check that the linkages operate all 3 carbs properly. If this is ok then provided the carbs aren't worn any additional amount to spend would be minimal. I'm not sure how to check the carbs for wear at a glance, maybe someone else can help here.

HB1200

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#5 smeer

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Posted 16 July 2006 - 09:57 PM

Hmm, what about twin 175s? I dont mind triple 150s, but it seems pretty hard to find nice 150SUs.. and 150CDs go for big bucks to concourse restos.

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#6 Zook

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Posted 16 July 2006 - 10:30 PM

Hey Smeer. I've got a set of triple 1.75" SUs you can have for $400. I'm told they were only run once after being rebushed and the linkages all seem tight enough. They are complete - cable, carbs, one piece manifold, filters, fuel splitter block, blah, etc. I haven't had a really good look at them yet but let me know if you are interested. Cheers. Paul.

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#7 _munro_

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Posted 16 July 2006 - 10:34 PM

Hmm, what about twin 175s? I dont mind triple 150s, but it seems pretty hard to find nice 150SUs.. and 150CDs go for big bucks to concourse restos.

keep an eye on ebay
the 150s don't seem to sell for that much

or you could look out for single/twin webers
or the x2 setup (twin downdrafts).

but on even a worked 161 you won't produce the air velosity to run 175s

:spoton:

tom

Edited by munro, 16 July 2006 - 10:37 PM.

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#8 _jklumpp_

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Posted 17 July 2006 - 01:56 PM

Stick with triples, rather than twins...1 carb per pair of cylinders is the way to get power from the red's

I was running triple 1 3/4 SU's until recently, and only went to Triple Webers because of racing...I loved the SU's - but my tip would be to spend the money first up and make sure it's done right...all the people who will bitch & moan to you about SU being a bugger to keep tuned, are the people who didn't do this....

My SU's, with Manifold & Chokes sold on Ebay for $460, and it was a Hemi man that bought them, to "one day make there way onto one of his projects"! They had been fully rebuit, rebushed, and came with ram tubes & filter socks.

I've been told the redline manifold is rubbish. Mine came originally with a Cain manifold which was great out of the box, but it cracked. I then replaced it with a Lynx, which I was told was one of the better ones, but I had to do a lot of port work to match it to the carbies, and get some decent power from it....I still don't think it was as good as the Cain.

Use OA6 needles...I was told these work for all Red motors.

Buy yourself an SU tuning manual, and understand how they work...they really are a simple design, and easy to work on - Even if you're not going to do the work.

Good luck!

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#9 smeer

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Posted 17 July 2006 - 05:15 PM

mm, I think I'll go with triple 150SUs.. if i can find a nice set. I've got the cash waiting!

Thanks all for your good advice.

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#10 Zook

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Posted 17 July 2006 - 07:55 PM

I just measured the SUs I have - did I say they are on a Cain manifold?

- and they only measure 1.625". Was there such a thing as 1 5/8" SUs?

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#11 smeer

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Posted 17 July 2006 - 11:40 PM

the model numbers should tell you!

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#12 _Aquarius - LC_

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Posted 18 July 2006 - 11:04 AM

G'day smeer, Hold out for tripple 1 1/2" SU's mate.!

Once set up right their great carbs. :clap:

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#13 _uglybob_

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Posted 18 July 2006 - 06:49 PM

hey guys i thought i might just add a quick question in since we are on the topic of su's... the linkages i got on my 1 3/4 su's where fologed out so i bought a nice red line set the only problem is i hav a lynx manifold so the bloody roller jobies that screw into the manifold dont fit as the thread is way to small, should i be able to get studs with differnt thread on each end??
bit of a silly question but i thought i would ask it..
cheers
ben