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Triple Weber’s or SU’s?

Started by _Ljtorrie73_ , Aug 19 2021 05:30 PM

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18 replies to this topic

#1 _Ljtorrie73_

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Posted 19 August 2021 - 05:30 PM

Hey fella’s,

Apologies if I am flogging a dead horse, but I am not sure whether I should buy triple Weber’s or SU’s for my lj torana. The car currently has a Holley 350, though I would like to change it to Weber’s or SU’s to gain a bit more hp (plus it looks and sounds sick!! Lol). The car is not on the road yet and hasn’t been registered since last owner in 2007. The engine is a 186 which has had a Holden 202 crank fitted (making it a 202) and is bored 60 thou (which from what I have found online makes it a 208) with flat top pistons, yells terra valves, double valve springs, 179 low Comp head (as indicated by head casting - 7420081), extractors and exhaust. This is pretty much all I know of the engine (was all done by previous owner).

So considering what’s done to the engine, which carb do you guys think will compliment the car the most? Should I look out for anything in particular (ie particular model/size of carby etc). Thank you all in advance and I look forward to some advice/recommendations

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#2 dattoman

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Posted 19 August 2021 - 09:03 PM

Depends how much you like tinkering/tuning

SU's would be easier...1.75"

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#3 yel327

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Posted 19 August 2021 - 09:13 PM

Talk to old mate in the other thread about Delco controlled injection. Worth consideration.

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#4 I'm a Red Motor fiend

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Posted 20 August 2021 - 06:10 AM

Datto is right, 1.75" SU's for a mild street car.

If the cam, head and exhaust aren't up to scratch sticking two extra carbs on won't yield huge results.

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#5 claysummers

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Posted 20 August 2021 - 08:59 AM

390 Holley on proper manifold easier still and gives good performance and economy to boot. Just not as much sex appeal.

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#6 _Ljtorrie73_

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Posted 20 August 2021 - 09:11 PM

Thanks for the input fellas. Yes it seems to be the case that the SU’s are easier/simpler to tune and are more economical than the Weber’s. Apparently they also perform almost as good as the Webber’s, with a slight edge going to the Webber’s when the engine has been worked/built correctly. Thanks for the responses, if anyone has further input please feel free to share : )

Edited by Ljtorrie73, 20 August 2021 - 09:17 PM.

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#7 caterham2

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Posted 20 August 2021 - 11:31 PM

Thanks for the input fellas. Yes it seems to be the case that the SU’s are easier/simpler to tune and are more economical than the Weber’s. Apparently they also perform almost as good as the Webber’s, with a slight edge going to the Webber’s when the engine has been worked/built correctly. Thanks for the responses, if anyone has further input please feel free to share : )

Running 2 inch SU on my 202, much improved over the 1.75 SU on car when I bought it. The only reasons people say SU carbs go out of tune are........................ worn shafts and old gaskets, worn needle jets, mates who insist on lifting the bonnet to "tune the carbies for you". Keep the bonnet shut, rebuild carbs when you get them and you will be a happy camper.

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#8 Dr Terry

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Posted 21 August 2021 - 10:15 AM

Running 2 inch SU on my 202, much improved over the 1.75 SU on car when I bought it. The only reasons people say SU carbs go out of tune are........................ worn shafts and old gaskets, worn needle jets, mates who insist on lifting the bonnet to "tune the carbies for you". Keep the bonnet shut, rebuild carbs when you get them and you will be a happy camper.

Add to that list, badly designed or badly set-up linkage.

Dr Terry

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#9 jd lj

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Posted 22 August 2021 - 11:38 AM

Webers all the way. Just don't fit chokes that are too big and get rid of the useless f2 emulsion tubes.

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#10 Zook

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Posted 22 August 2021 - 06:46 PM

Single 48 IDA all the way.
I'll see myself out.

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#11 _Lazarus_

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Posted 22 August 2021 - 09:20 PM

IDF might be easier -

https://www.lynxauto...eber-dgv-1.html

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#12 Indy Orange

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Posted 22 August 2021 - 09:51 PM

Go with the triple Webbers.

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#13 Redslur

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Posted 23 August 2021 - 12:04 PM

A V8 with a 750dp will sort all your problems out :-)

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#14 RallyRed

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Posted 23 August 2021 - 12:17 PM

Webers or SU's, i believe the key to it all is getting them set up correctly in the first place.

I was lucky enough to link up with a guy here who did that, and they have been good.( 45mm Webers & 48mm Dellortos).

Both cars start pretty easy even after sitting, and perform well.

I know some other guys with sU's who also had this bloke set them up.

Hopefully there is someone local to you who knows how.

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#15 _Ljtorrie73_

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Posted 24 August 2021 - 08:23 PM

A V8 with a 750dp will sort all your problems out :-)

V8 is the plan later down the track mate 😈👍🏼

Go with the triple Webbers.

Hey I never say no to a nice meal 😆

Webers or SU's, i believe the key to it all is getting them set up correctly in the first place.
I was lucky enough to link up with a guy here who did that, and they have been good.( 45mm Webers & 48mm Dellortos).
Both cars start pretty easy even after sitting, and perform well.
I know some other guys with sU's who also had this bloke set them up.
Hopefully there is someone local to you who knows how.

Yep definitely. I know of a couple people who have a lot of experience with these carbs so I will definitely be getting them to work their magic. Cheers

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#16 _Ljtorrie73_

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Posted 25 August 2021 - 07:48 PM

Webers all the way. Just don't fit chokes that are too big and get rid of the useless f2 emulsion tubes.

Thanks for the advice mate, I am swinging towards the Weber’s

. Tho from what I have read it seem that it can get pretty technical and complicated setting them up properly. Looks like I got some research and experimenting to do 😁

Edited by Ljtorrie73, 25 August 2021 - 07:49 PM.

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#17 jd lj

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Posted 26 August 2021 - 09:08 AM

Why fit a v8 when you can just fit a webered Jzed headed 202?

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#18 _Ljtorrie73_

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Posted 26 August 2021 - 04:54 PM

Why fit a v8 when you can just fit a webered Jzed headed 202?

Later down the track (when I mean later I mean in many years to come, I’m only 21 yrs of age so unfortunately I can’t afford blowing all my money on cars as of yet 😆), I plan on having a bit of an hectic setup (700+rwhp). Maybe I may go the Ls route idk yet tbh. But at this kind of power level I want something which is going to be reliable yet streetable, so that’s why I’m leaning towards a modern v8 platform such as an Ls down the track. But these are just plans…