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weber or twin su's
https://www.ausmini.com/forums/viewtopic.php?f=2&t=42581		 Page 1 of 2
Author:  DJ [ Sun Jun 01, 2008 12:50 pm ]
Post subject:  weber or twin su's
I have a standard 1275 with a single su 1 1/2 i think and am looking for a little more grunt.

I am looking at either twin 1 3/4 su's or a weber what would be better?

I dont want to modify the fire wall.

If you think a weber is better, can you let me know what to look for?

Thanks
Author:  spraycanmansam [ Sun Jun 01, 2008 1:08 pm ]
Post subject:  Re: weber or twin su's
The norm is only one 1 3/4" SU, which is more than enough for most, but twin 1 3/4" SU's can definitely be done 8)

An 1 3/4" will give you more torque than a weber. But nothing sounds quite like a weber does! :twisted: If it's for the road, I'd definitely suggest a single 1 3/4" SU, as it will be a lot nicer with the extra torque down low.

<EDIT> If you don't want to modify the firewall, forget the weber. They need a decent length manifold to get good performance and *cough* fuel economy. There won't be enough space to fit a nice manifold and filter in... I even had to bash a little bit in to fit my 1 3/4" :o
Author:  mini-dunger [ Sun Jun 01, 2008 1:36 pm ]
Post subject: 
you will need a webber box(battery box) if you use a webber.

Any step up from a 1.5 su would more than likely require "some" fire wall mods.
Author:  Mike_Byron [ Sun Jun 01, 2008 2:22 pm ]
Post subject: 
A HIF44 (1 3/4") with the pommie water heated manifold (with or without the water plumbed in) fits nicely with no modification to the fire wall.

I just run a short trumpet with a foam sock type filter tied to it with a couple of cable ties.

Mike
Author:  spraycanmansam [ Sun Jun 01, 2008 2:27 pm ]
Post subject: 
Foam sock filter will fit no worries, but a Ramflo or K&N might need a slight tap to fit, not much :wink:
Author:  Spaceboy [ Sun Jun 01, 2008 2:52 pm ]
Post subject: 
twin hs4's or single hs6/hif44 would be ideal
Author:  Mike_Byron [ Sun Jun 01, 2008 3:10 pm ]
Post subject: 
If you go the way of a HIF44 - buy a kit from SU Midel in Sydney or your usual mini supllier and put that through the carby. Instructions come with the kit.

The reason is that once the carby has dried out on a shelf somewhere, a rubber "O" ring on the choke mechanism hardens and cracks. This lets raw unmetered fuel into the engine and the car will run intolerably rich. The choke mechanism is very diifferent to the choke on the traditional SU carbies.

Its not a harbour bridge purchase - about $40 and it means you do the carby fitting properly and more importantly ---- ONCE.

The HIF44 is a good carby and is trouble free otherwise.

Mike
Author:  Morris 1100 [ Sun Jun 01, 2008 5:07 pm ]
Post subject: 
On a stock motor the HS4 will usually work better than a HIF44.
Bigger carbies have slower airflow at idle and low speeds.
Author:  mini-dunger [ Sun Jun 01, 2008 5:28 pm ]
Post subject: 
I have a ram flow filter on an minispares manifold and I had to manipulate the man hole cover and grind a little off the firewall around it where the filter goes.

no biggy though
Author:  spraycanmansam [ Sun Jun 01, 2008 5:33 pm ]
Post subject: 
mini-dunger wrote:
I have a ram flow filter on an minispares manifold and I had to manipulate the man hole cover and grind a little off the firewall around it where the filter goes.

no biggy though


Exactly what I was talking about! :D
Author:  minsta [ Sun Jun 01, 2008 7:31 pm ]
Post subject:  su
hiya!

I am the same as mike - running a HIF with a metro manifold and a short trumpet with a sock.

Just fits!

cheers! jon
Author:  gerg [ Sun Jun 01, 2008 8:01 pm ]
Post subject: 
Hey Jon, if it's induction noise ya want, try one of these.....
Image
I think on a standard 1275 that twin 1.75's is overkill, my 1360,(102bhp) , re13 cammed motor uses only 1 , oh and a GR manifold 8) 8) .

Gerg
Author:  drmini in aust [ Sun Jun 01, 2008 8:09 pm ]
Post subject: 
1360cc, RE282 cam, 1.58:1 rockers, race valves, 45 DHLA Dellorto carb with 38mm chokes, has 125HP+.
Noisy? Better believe it... :lol:
Image
Author:  minidrifter [ Sun Jun 01, 2008 8:10 pm ]
Post subject: 
so a 42 webber for my slightly warm 1100 is overkill then :?
Author:  tinymorris1969 [ Sun Jun 01, 2008 8:11 pm ]
Post subject: 
lmao the webber you got atm is over kill.
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