FE-FC Holden Discussion Forum

G'day,

trying to sort my carby options out once and for all.  I need something reliable, but with a bit of get up and go as I generally like to give any car a bit of a boot full on a daily occurence.

It won't be doing any huge rpm, as the bottom end is not balanced.

179 bored to 192
Just a stage 3 head with twin point dizzy and at present a stock cam that will be replaced with a 30/70 down the track.

webbers ommitted for financial reasons ;D
Regards
Dave

Best set up is a funny question !
Best for DAILY DRIVER would be  single holley 350
Best for PERFORMANCE would be Triple CD's

If you are daily driving, then triples could be a pain in the RS, where as a simple holley would do the trick, but if you don't mind spending the time balancing triples and keeping them balanced and intune, then triples would give better performacne.

Just my opinion....and I will be running triple CD 150's on my worked 202 !

Cheers

Mark

All too true,

although I am a little reluctant to run a Holly, as every second red motor advertised has a 350 and extractors.  It would be nice to have something a little different than joe bloe.

The twins look pretty cool with nice filters. I wonder how often they need tuning?  

You can just about pick up a Holly on a redline manifold for nothing these days.

I've got X2 headers, so maybe could go for the whole X2 look with twins?  I just wonder why Holden ditched the twins so quick.

Dave

Dave......I think that's a good compromise.....not too hard to tune and balance twins, will give better performance, and will look right at the same time....plus you won't have to cut into your firewall to fit the triple CD's like I had to !

Better than a holley and easier than Triples....JUST GO FOR IT !

Cheers

Mark

Holley 390,nice and docile on primaries, with secondaries  you have all you need on tap for a pretty hot motor.its by far a better choice than a 350.and is a bit out of the norm.

I've gone a Holley 4bbl 450 VAC and never looked back!

Used on a fairly hot 202 (14.2 sec 400m in an LJ Torana) and I used to drive it to work (26kms each way) with little hassle. The only real problem was vapour lock on extremely (35 plus) hot days.

A single carby on a 6 cylinder will always cause the centre cylinders to run rich and the outer cylinders to run lean. Look at the manifold and you will see the difference in intake runner length. Multiple carby's always provide better driveability and performance as the fuel distribution in more even.

If you don't want to cut the firewall look for an Armours Manifold. The intake runners are separate, only joined by rubber hose, and bend forwards so as to clear the firewall. They were designed for SU's but I'm pretty sure the CD Strombergs will bolt up.

Cheers,

Craig.

 Mmm  Yeaa
   Triples are great , but as Craig has posted earlier , SU's need plenty of tuning .  When mine were in prime cond. and plenty of "right foot" on a good day I was getting around 10 mpg (long time ago) and about 7 mpg on a bad day , ya don't get very far on a tank full of juice  :o   But they were tuned for performance not for economy  ;D   and that was on a 186 ,  dunno what I'd get with the 192 I got now ? ? ?

   Norm  :)

  Wonder why flames come out the exhausts ?  ::)

Hi Guys.

Everybody always talks about tuning carbies & keeping multiple carbies 'in tune'.

What I have found (I've been doing this for 34 years) is that it's not the carbies, it's the linkages that cause all the drama.

Take a look at a genuine XU-1 set-up, if the linkages are properly adjusted, they stay that way for years. Most multiple carby set-ups suffer from lousy (read cheap) linkages where you can synchronise the carbies to perfection, drive the car once around the block & they're out again.

If you going to put multiple carbies on your car spend a bit extra & modernise the linkages. use a 'divorced style' set-up where you have a common shaft & 2 (or 3) separate 'pull' rods, one for each carby, also use the hexagon type shaft to ensure no slip can occur where the levers attach. Make each rod easy to disconnect & adjust. Spend a bit of extra time engineering the throttle properly, with an adjustable 'stop' at the pedal to reduce undue force on the linkage at full throttle, it all helps.

Dr Terry.

Sound advice Dr Terry.

Does anyone know a general set up for a 390 Holly, power valves and jets for  a 192 motor with  extractors, Bathhurst 6000 head inc roller rockers, mild cam , balanced bottom end, Commodore clutch and a 5 speed Celica steel case box. Currently running a 253 WWW Stromberg, which runs but not too well??

Any info greatfully acepted.

Grah.