48 replies to this topic

[madtoranajzedded]

Hi gents a dude has his seton manifold for
sale on fakebook and im interested in
purchasing but unsure if too long for the
carbs i want to use

I want to run mikunis on them

Question.

Would these long runners be suitable for the
mikunis or would they desire a shorter runner?

I dont have the faintest idea what length i
need

Cheers Maz

Edited by madtoranajzedded, 04 October 2016 - 05:05 PM.

[Potta]

Link?

[jd lj]

I saw that manifold on the weekend, Seton manifolds are rare as and have an excellent reputation as far as I know.

[lakeside]

[madtoranajzedded]

Thats them

Hmm ive had abit of a google but there isnt
much info out there on what is a good length
to run with mikunis
i did see on another forum a guy asking the
same question but on a datsun 240

He purchased his carbs with mikuni short
runner manifold.says that the short is a
little more bent than the long runners.he
was wondering on the lengths that affect performance.i would believe that the long
runners would increase the torque of the
engine but the shorter runners look a little
restrictive with the bend in them blah blah
blah!...

Another fella was looking for same answer
but was motivated to check into it because of
a stumbling issue he ran into as he
increased the venturi size.For some
background his mikunis came with the mikuni
manifold but later changed to cannon long
manifold since he was told the longer made
more power...

His motor is a 2.8 9.1 compressoin large
cam ported heads etc..

He goes on to say as he increased the
venturi size to a 37 or larger i started to
run into a big stumble if i accellerated hard
or punching it down the freeway..his motor
was getting lean at those moments (per meter
mixture) and despite what changes he made to
accellerator pump jet sizes etc the issue was
allways there,would b milder with 34s but
worse with 37s ..Of course this hurt his top
end power and was yearning to go 39s,but the
stumble was ridiculous at that size

He scouted about and found a shorter manifold
sk/sanyo which looked like the cannon 5" 1/2
but alot shorter 3" 1/2 i think..

The difference between them is night and day

All his flat spots dissapeared ,feels much
torquey .ran great with 37s then upped to 39s
and his high rev range was extended further
but without any hesitation off the line or
midrange witha 4.44 diff

His advice is to get something straight but
shorter than the 5.5" cannon.

I know its a different donk but maybe im
better with a shorty?.im going to give the
seton a miss as its over 7" long..

[warrenm]

The Seton is similar to the Armours manifold accept the front & rear runners turn in to the centre so that miss the firewall in the earlier Holden's EH etc.

Stay long, Read oldjohnno's latest.

http://www.gmh-toran...pressure-waves/

[8BALL]

http://www.gmh-toran...2-mikuni-carbs/

OJ talks about manifolds here.

[madtoranajzedded]

Im i little confused with it all to be honest
guys.with this wave bounce in manifold you
can only tune it to arrive back in a narrow
Speed range so with my thinking it depends on
what rev range you want to tune the runners to?.
Johnno does mention it doesnt really matter
what length the runners are but in that mikuni
thread above says to keep the volume low.
Do the velocity stacks add to the overall
length of the runners or help tune to get your
air fuel mixture right.
Im not sure that i read somewhere that the
mikunis dont suffer reversion as much as
there is no restriction in the inlet tract.

Edited by madtoranajzedded, 06 October 2016 - 01:24 PM.

[madtoranajzedded]

Thanks Bomber.i wasnt really sure if the
bellmouth could change the length in that way
I just thought its a little easier than
changing manifolds etc when dynoing for
tune,as they get expensive.
so in away its tricking the head on the
speed of air entering the port?

In all honesty what would you do DJ in my
instance. Im just no good at learning all
the sh@t lol usually i just buy good gear and
get it going with only having 1/2 a clue on
how stuff works..usually i just let the
builder go for it..but joining this forum has
made me waay more fussy and just wanting to
know more and trying to understand and learn
from you guys.

Edited by madtoranajzedded, 07 October 2016 - 12:16 PM.

[u1 71]

There was one for sale with 2 inch sus on eBay for a grand awhile back could be the same guy, they're not hard to find I have one,i was told that the armours manifold was a copy length wise,also there's a guy in Bulli that was selling an original mild steel one

[jd lj]

There was one for sale with 2 inch sus on eBay for a grand awhile back could be the same guy, they're not hard to find I have one,i was told that the armours manifold was a copy length wise,also there's a guy in Bulli that was selling an original mild steel one

I've got to laugh at the above comment as all the ones you are talking about are from the same seller. If they are out there he'll be onto them in a flash, if you need inlet manifolds for triples or SU carbs or even genuine xu-1 Strombergs he's the man to get in contact with.

[u1 71]

Is the seller a personal friend of yours

[jd lj]

Yes. He buys and sells lots of parts and comes across some great finds in his travels but puts in a lot of work to do it. He's become very knowledgeable with Strombergs, su's and there manifolds. Not to mention the red motor heads he's found /bought.

[madtoranajzedded]

The Seton is similar to the Armours manifold accept the front & rear runners turn in to the centre so that miss the firewall in the earlier Holden's EH etc.
Stay long, Read oldjohnno's latest.
http://www.gmh-toran...pressure-waves/

Hey Warrenm .could i ask ,have you ran the
Armours.i got the measurements to seton and
is 4mm bigger in horizontal than my head so
I wont b porting head more just to fit them.
I will see if i can run armours if they will
Clear bonnet and clear inner guard

The armours are 8" long and 1.75 dia.. is there
A metal filler i can use as the hsr's are
near 2.5 mm smaller and would like to have
them perfectly matched

Cheers maz

Edited by madtoranajzedded, 17 October 2016 - 01:11 PM.

[warrenm]

I have an Armours setup on my car.  

Devcon "F" can be used to reduce the size in the manifold.

I just had a look at the price of the devcon, it's a bit scary, so make sure your sitting down. There will be an epoxy filler that someone else makes that will do the job.

Edited by warrenm, 18 October 2016 - 06:02 AM.

[madtoranajzedded]

Gee that is up there.couple places i looked
want $162 for 1/2kg ,spose its worth it
considering it will help flow..

Thanks for that Warrenm

Would it b cool to show a pic of your setup 😊

Cheers maz

[warrenm]

The last pic is an old pic, when it had HS8 carbs & before I welded tubes between the runners.

 P1020142 (600 x 450).jpg   74.23K   19 downloads  DSC00014 (600 x 450).jpg   80.2K   23 downloads  P1010543 (600 x 450).jpg   82.7K   17 downloads

[madtoranajzedded]

Shit yeah.they look great in there.
How close they come to the bonnet,they
appear to be close going by the guard..
ive got to work out how close the mikunis
wil come to bonnet as they look taller than
the Su's .Did you port out the runners bud as
my Head port is 38 by 57mm.

Cheers maz

Edited by madtoranajzedded, 19 October 2016 - 02:43 PM.

[warrenm]

I run a solid mount on the left of the motor to stop the front carb touching the bonnet. I would've touched the ports a little to match them up, but I can't remember how much. Be aware that there's 2 Armours manifolds, one to suit the Torana, which has the carb flange angled down to miss the bonnet, the other has the carb flange at 90° to the runner. There's a pic somewhere on the forum comparing the 2.

[madtoranajzedded]

Thanks Warrenm.i appreciate your time and
effort to help me sort out whats needed to do
to get these in there.thanks heaps mate

I come across the revheads site in Brissie
and they make them to order in lengths of
7" and 8" inches...I have not yet contacted
them as to find out more on them,which i will
b doing very soon.

By looking at yours,you have the ones which
have the angle on flange.id say yours are
8" long?.
I think i might ask Peter who is running
mikunis ,whats the height of the hsr from top
of flange to top of carb.just had a look at
his pic and i was waaay out that the mikunis
are taller than su's .not from top of flange
up anyway.

What is the height of sus from the top of
flange Waz and length of runners.i reckon i
Will have more room but in any case im
interested to know by how much.

Cheers maz

[madtoranajzedded]

Oh heres a pic of them off their site

These look like the 90 deg one's you
mentioned

 RHWAM_thmb.jpg   4.1K   11 downloads

Edited by madtoranajzedded, 20 October 2016 - 01:50 PM.

[warrenm]

There's a pic comparing the 2 types of Armours at post #162.

http://www.gmh-toran...-su-info/page-7

[madtoranajzedded]

Brilliant Waz.nicely hidden in the su thread

Thanks ☺

And what dave would say

A like button for you 🙄

[madtoranajzedded]

This is funny I end up emailing johno
from revheads and showed him the pic of the 2 Armours manifold .even explaining the angle
and his response was...

Hi Jason i have been in the game 50 yrs and
AFAIK there is only one and mine are a copy
of the original warren manifold...

I have sent the pics again and now waiting
for a reply ....