Info required on triple carburettors
#1 _Eddie_
Posted 02 March 2006 - 10:47 AM
The reason I ask is I have a set of SU's at the moment which I'd like to put on the car but they will need to be cleaned up and possibly rebuilt. I am wondering if I should bother paying some to rebuild them or if it's better to buy an already reconditioned set. I see the triple Webers and Delltoros fetch a lot higher than the SU's. Why is that?
Also, the SU's came stock only on GTR's and XU-1s is that right? And is SU a seperate company from Stromberg?
#2 _Keithy's_UC_
Posted 02 March 2006 - 12:14 PM
Dont be fooled though - although the SU's are not fetching as much, they are still a brilliant carburettor! And to top it off they are easy as punch to tune (if you know how to tune 3 at a time)!!
I have a set of Triple SU's (1.75") that are getting rebuilt as we speak...
Keith
#3
Posted 02 March 2006 - 12:40 PM
They are a completely different carby to the SU, and made by a different manufacturer.
I'd say the weber carbs would be the best option, they are a twin throat carb and have more adjustments, but can be a little bit more time consuming to keep in tune.
I have run both SU's and Stromberg's on holden sixes, personally I liked the stombergs better, they just seemed a bit more refined (driveability wise) as compared to the SU's
#4 _rorym_
Posted 02 March 2006 - 08:30 PM
R
P.S. Dellortos...see = Webers...Italian version of same. ..Webers and Dellortos =They are dearer because they cost 3 times as much as the others at retail.
Edited by rorym, 02 March 2006 - 08:35 PM.
#5 _Eddie_
Posted 02 March 2006 - 09:46 PM
#6 _4door_LJ_
Posted 02 March 2006 - 10:26 PM
Spent the winter cleaning them up & re-kitting them.
They're on there now & running reasonably well. Got 'em balanced just need to tune them to the motor a bit better.
By doing it myself it's taken longer but I've learnt a hell of a lot about them & engine tuning along the way.
I bought a book from a 2nd hand bookshop on tuning SU's that was printed in 1968 & it's basically been my bible.
A decent website is:
SU website
#7
Posted 02 March 2006 - 10:43 PM
^^^ Yeah, I agree but also disagree, lol, sorry to be difficult. I run triple 45 mm Dellortos on a reasonably hot 202 and i love nothing more than to hear it sitting on 7000 RPM on the burnout pad at tarmak Dragway, But i also like to drive the thing on the street and on Torana runs n Stuff.If you dont have a local professional Weber tuner in your family and you are not running an NC race car,forget it. If you want flat out top end all the time at 7,000 rpm these are the goods...for idleing down Main St with the odd blat once a week...forget it.
I've learnt how to give them a basic tune by using a piece of pipe, and im able to drive it on the street regularly without any troubles, aswell as sneek out the road and give it a bootfull. I've found that they stay in tune fairly well.
I suppose it just comes down to what you want... If it's perfomance go the webbers or dellortos or if its drivability and easy tuning take the strommys, they are very easy to work on and do perfom fairly well. Although heres a comparison not sure how accurate it is but i ran mine down the quater with the 175 strommys for a best of 14.6, bolted the dellortos on with no other modifications and got a best of 13.5. Although could be numerous other factors that influenced the times.
Anyway, I'm happy with my dellortos performance wise and drivablilty wise so the choice is really yours, and what it comes down to.
Cheers
Les
#8 _draglc_
Posted 03 March 2006 - 12:24 PM
A1
#9 _rorym_
Posted 03 March 2006 - 05:26 PM
Easy as to tune and they stay in tune.
R
#10 _draglc_
Posted 03 March 2006 - 07:59 PM
R, engine will be run in soon, and ready to race! Hope ur gonna make it to morgan park in may
A1
#11 _rorym_
Posted 04 March 2006 - 08:02 AM
www.wheelsonwidebay.com.au
These guys were the ones that got Leyburn and Gatton up and running.
R
#12 _Bomber Watson_
Posted 04 March 2006 - 12:35 PM
#13
Posted 04 March 2006 - 12:44 PM
max performance with no expense spared - weber/dellortos
everyday easy to tune/ keep in tune - SU/Stromberg
Hate to burst some ballons but you can tell the blokes that have never had Webers...they always recommend them. Webers are the closest thing to manual fuel injection. you can get....
haha i assume you are referring to me, you are right I have never run triple webers on a holden six, but does dual webers on holden V8 count... Admittedly I had help with the tune side of things, but I found that it was worth getting someone with knowledge to do the initial setup. With a few pointers on what to adjust relative to the variables (say weather/car setup for example) it wasnt THAT hard to keep them in tune. Provided you are not constatly changing you engine spec..... Probably the hardest part is just getting the right advice to start with, as there are LOTS of people who think they know....
I guess at the end of the day, everyone has different experiences with all things car related, and these forums are a great way of sharing what we all have learned!
cheers,
Sam
#14 _rorym_
Posted 04 March 2006 - 01:56 PM
R
#15 _Eddie_
Posted 04 March 2006 - 06:24 PM
How often would it need to be tuned? Not for all out track racing, but for a fairly nice streeter, driven once, maybe twice a week? Once a year, twice a year?
#16 _rorym_
Posted 04 March 2006 - 06:42 PM
My guy does 4 runs for $200 including the tune...a few needles or jets might be extra but it runs spot on.
R
#17 _Bomber Watson_
Posted 04 March 2006 - 07:01 PM
#18 _Eddie_
Posted 04 March 2006 - 07:21 PM
EDIT: While we're on the topic, does anyone know a good dyno tuner in Brisbane? Preferably one with good knowledge of holden 6's and SU's and who's not gonna rip me off. Redcliffe dyno maybe?
EDIT 2: I'll also need the SU's to be rebuilt and kitted if anyone knows anyone good?
Edited by Eddie, 04 March 2006 - 07:29 PM.
#19 _draglc_
Posted 04 March 2006 - 10:26 PM
mick at northside carburettors is a whiz.. does webers, and he does my SUs
also does dyno tuning, though he takes the car somewhere else to do it as he doesnt have one in his shop.
his number is 3865 3111
A1
#20 _uglybob_
Posted 04 March 2006 - 10:33 PM
sorri to but in..
#21 _Aquarius - LC_
Posted 05 March 2006 - 12:08 PM
Eddie, I have owned holden 6's for the last 17 or so years,
and had just about every carby configuration you can, :lol
and in my opinion the 1"3/4 su's i currently run are best
allround set up ,great driveability,good power aswell
It does take some dyno work to find the right spring-needle
combo for your particular engine.
mine haven't gone out of tune yet.
...goes to touch wood really quick:lol
#22 _Keithy's_UC_
Posted 05 March 2006 - 12:52 PM
I will be polishing them up before they are fitted/dyno tuned...
#23 _Eddie_
Posted 05 March 2006 - 05:05 PM
Ah Mick yes, I have been through these guys before - their shop is like 2 mins down the road from me. I got them to install a carb and electronic ignition on my old motor. He can do my SUs... Now to get the best out of the motor, the SUs should be configured and jetted accordingly to the engines displacement, breathing etc? How do they determine this? Do you just give them your engine figures and it's done theoretically on paper or do they test your motor, by dyno maybe, then configure it from there?mick at northside carburettors is a whiz.. does webers, and he does my SUs
#24 _Bomber Watson_
Posted 05 March 2006 - 05:08 PM
#25 _draglc_
Posted 05 March 2006 - 08:42 PM
A1
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