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Triple Weber info.

Hi guys,

Quick question regarding triple webers/dellortos. We are looking at running them on the son's 202 and have found a few individual webers and dellorto sidedrafts in the UK much cheaper than I can get them here locally. Now the only problem is we are not sure if we need the 40's or 45's. I've heard stories of people running both. We just don't want to under or over carb the engine. The plan is to run a set of triples (not SU's because I hate tuning the bastards each week!), xu1 grind or similar spec'd cam, yella terra head and possibly some flat tops. So OldHoldeners which of the above sizes would be better suited to our application? The 40 or 45's?

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most of the hi rev nc race toranas run 45 or even 48's

a street car would have killer torque with 40's but probably lose out at 6000rpm+ - would that matter?

FWIW i would want a matched set, personally, start with 3 all set up the same if possible cause all those chokes, emulsion tubes and jets cost big bucks when you need to buy them in sets of 6 each time.

ps with webers there is a chart ill try and find, gives estimated power and choke size.

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I would definately recommend the 45mm. I ran triple 45 dellorto's on a street car and found them to be spot on. A mate had triple 42mm webers on his 192 and we threw the 45mm delloto's on to try them . Really didn't notice much difference down low or throttle response but above 5000 rpm the 45mm were much superior.If you have a bit milder combo you can always go a bit smaller in the choke sizes if you need to.Agree with Ben above re getting a matched set as they can soak up a lot of dollars in chokes,jets emulsions getting them set up the same. I always preferred dellorto's for that reason as they used to be a lot cheaper than weber for parts but that may be different know as you don't see as many dellorto's about.Also spend the $$ and get a descent linkage set up. The cheap plastic "rose jointed" and similar ones will give you no end of troubles tuning them.I have also ran 48mm on a street car as the engine was heavily modified but they were still quite streetable.

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Cheers,
John.

if you buy individual carbs you will never get them to tune properly as they have all worn differently and run differently. you will have to fork out to get them reconditioned buy new or a set you know are matched. or go EFI.
triple carbs are always a nuisance on street cars.
I ran twin sus on my healeys and triumphs for years with no problems although don't like rough roads.
johnperth

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My SUs have been on for over 20 years, reshafted twice, checked every 3-6 months for mixtures and such... buggerall adjustment needed. Redline linkages, my own main link, never an issue.

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They don't make em like they used too!

HJDave.

As a young fella the old man had triple SU's on his Torana and was always out fiddling with the bloody things each weekend. When I got my own at 21 I had the same problem, I'd be out tuning the buggers each week. Tried some plumbers glue to keep the idle and mix screws in place but they'd always end up running out of tune. So I don't particularly want the young fella to have to be doing it each time he wants to take his mates or boyfriend out for a spin.

I'd love to know what you did with yours to not have to tune them all the bloody time lol.

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It's amazing the myth's that crop up just because a carby type is used as a twin or triple set!. Su carbs while not my preferred choice have been used in hundreds of thousands of vehicles over the years. I have never heard of any su carb idle adjustment/mix screws constantly going out of adjustment on a single application so why would they on a multiple application??. The only cause of problems in a multiple application is a crap throttle linkage or being poorly synced allowing each carb to get different throttle openings.A mate of mine ran triple 1-3/4 su's on a mild 202 and they never took much more attention or maintenence than a single carb once initially set up.Over the years I have used 1-1/5 & 1-3/4 cd stromberg's,45mm dellorto's & 45mm webers,48mm dellorto's and 55mm webers and didn't really have any issues with any going out of sync or tune! I'm guessing HJ Dave has a descent throttle linkage and a reasonable understanding of how his carbs functions and that is why he is not tuning them every weekend!

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Cheers,
John.

Thanks for the info mate. If we go the triples I'll throw a kit through them and take them to get tuned properly, and just keep an eye on them.

And yea my son is gay. I've got no problems with it. He's my son, who just so happens to be gay.

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You sound like a good dad. Good on you.

(Can't help with the triples, sorry)

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It's a waste of time putting a kit through SUs without doing the throttle shafts. The biggest problem with SUs is sucking air past worn throttle shafts or worn shaft holes.. You will never get them tuned properly with worn leaky shafts.
Some places ream the carby body and put oversized throttle shafts. Problem is, when the oversized shafts wear the carby body you have to toss the carby.
Better places ream the worn carby body out and put bushes in back to the standard throttle shaft size. I think this is the better way to go about it.
I bought my last set of SUs brand new. I got them dyno tuned and ran the car for three years without any trouble or fiddling with the carbies.
David

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Old is good.

The springs under the screws are quite heavy, dunno if they are std but keeps the screws tight enough to not move on thier own.

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They don't make em like they used too!

The young fella just asked me about running a Holley or another brand 4barrel on it. Now these I have no knowledge on whatsoever. So if we were to run a similar set up to above. Ie. yellaterra head/ported red/std blue/161 head on it, maybe some flat tops, xu1 cam, what size 4barrel would be recommended/needed.

Trying to find a set of triple anything, matched for under 1k is appearing to be a bit like trying to find the proverbial needle in the haystack.

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I have personally never used a 4 barrel on a six but have seen the 390 cfm and 465cfm four barrels both used successfully. I would think the 390 vac secondry would be very streetable and give reasonable economy.

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Cheers,
John.

my advice about running a 4 barrel is whenever possible, turn it 90 degrees and face the primaries furthest from the head, this gives much better mixture distribution than primarys towards the front and secondarys towards the back of the engine.

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