31 replies to this topic

[adam_73LJ]

Hi,

 

Just wondering if anyone has delt with triple 45mm Mikuni carbs on a holden 6. Any comments, pro's or con's or otherwise. How they compare to SU's and Webbers etc.

 

Cheers,

 

Adam.

[N/A-PWR]

Great choice Adam,

 

I have spoken to Oldjohnno about the 45mm too,

 

 but is said that the HSR-42 is the best option,

 

 as they are a great deal more efficient and is plenty,

 

 for 250cfm port flow.

[Peter UC]

I have the HSR-42s on mine. I have no complaints, throttles crisp, tuning was no problems once I realised they don't like a big balance tube in the manifold like SUs usually run. I blanked them off and the big flat spot I had at low speed went away using a Redline manifold.

My cam is a Crow 35626 and I still get 11l/100km on the highway (I do run a 5 speed with 3.08 gears however) and around 15L around town. Cold starting is fine without the choke.

[N/A-PWR]

Fantastic information Peter,

 

 could we get a photo of what they look like on the manifold please?

 

 

 

Like button for you too

[madtoranajzedded]

Ohhhh...YES PLEASE..

[LC-GTR-1969]

I have the HSR-42s on mine. I have no complaints, throttles crisp, tuning was no problems once I realised they don't like a big balance tube in the manifold like SUs usually run. I blanked them off and the big flat spot I had at low speed went away using a Redline manifold.

My cam is a Crow 35626 and I still get 11l/100km on the highway (I do run a 5 speed with 3.08 gears however) and around 15L around town. Cold starting is fine without the choke.

pics or it doesn't exist lol

[N/A-PWR]

Keihins FCR,

 

 thanks Oldjohnno.

 

Like button for you.

 

 now goes and find prices to compare to HSR

[LC-GTR-1969]

As much as I like the HSRs and FCRs I have to say that for any hot street engine I wouldn't even consider anything other than 2" SUs. The old fossils flow much better than you'd expect at WOT, needles are readily available (so there's no excuse for a poor tune) and on a HP per dollar basis they can't be beat. For a maximum effort race engine the HSR's would have a small advantage but on the street a set of unmolested SUs would still be my first choice.

I am planning on putting on my set of HS8s in the next few weeks to test back to back against my 45DCOE webers. I will be tuning with my Innovate LM-2 wideband/data logger . 

 

I rebuilt the 2 inch SUs and put in UP needles, .125 jet... so hopefully they are close...

[Peter UC]

I'll post some photos when I get home

[Peter UC]

As promised

 Mikunis.jpg   245.38K   16 downloads

[N/A-PWR]

Very neat set-up Peter,

 

 

 thank-you very much, most appreciated Mate.

 

 

 

 

Like button for you

[LC-GTR-1969]

They look great...

[Ice]

First time ive ever seen a set on a Torana they look good Peter

[madtoranajzedded]

Mmm.they sure look good.that redline
manifold is similar in design to warnefords.runners have an s design on
outers for ease of instalation with cars
such as ehs to have clearance off firewalls.
ive been looking at Sonics single mani design
as runners are straight.hes actually looking
into making all 3 runners together.
im interested to know how much of an angle
the mikunis can be set on an incline.i gather
not much more than how Pete's setup is..i
would like them to b a little straighter

Edited by madtoranajzedded, 21 September 2016 - 08:42 PM.

[Peter UC]

As above it's a Redline manifold, I was going to use an old Cain or Armors setup but I couldn't find one when I was looking and the Redline seemed all that was available at the time. Besides the drop in flow through that kink would be minor at best. I actually spoke to Ian Tate about it before I bought one and he uses them and has no issue.

The setup is pretty simple, the place I bought them from extends the throttle shafts so they can be joined with a solid shaft (8mm from memory) using rod clamps. The throttle cable is the standard one and connects to the carbs with a clamp on mount onto the throttle connecting shaft and the cable sheath mount is a simple bracket made up. 

[madtoranajzedded]

Thanks for that little info Peter.thats
reasuring the the red manifold is good to use
I overlooked it at first and have been trying
to find warneford without much success.
near same in design .a setup i found with
with mikunis on had a great linkage setup
Your linkage setup is even simpler and very
tidy..can i ask where did you get your
setup through that extends the throttle shafts
for ease of installation...

Cheers maz
 j&s 1 001.JPG   192.32K   14 downloads

[jd lj]

So do these use a Stromberg /SU bolt pattern to mount them?

It's good to see someone doing something different for a change.

[madtoranajzedded]

So do these use a Stromberg /SU bolt pattern to mount them?
It's good to see someone doing something different for a change.

They use these fittings James
 images (1).jpg   8.62K   3 downloads

[madtoranajzedded]

Wouldnt 3-4 get more juice then than 1-2 5-6 ?
Or one carb fedding 3 .

Edited by madtoranajzedded, 22 September 2016 - 07:27 PM.