ausmini
https://ausmini.com/forums/

Quad hs2's?
https://ausmini.com/forums/viewtopic.php?f=5&t=79420		 Page 1 of 2
Author:  princess [ Tue Dec 04, 2012 8:06 am ]
Post subject:  Quad hs2's?
Alright call me crazy but I think I want to step up to quad hs2 carbs on a 7 port head, what I want to know if roughly how much power a single hs2 carb can supply? Also do you know anyone that has run this setup on a 7port a series head

Currently I'm getting 42kw atw on twin hs2 carbs. But that's at 4900rpm and I have a bigish cam so I'm thinking it should may be running out of breath.

Also I'm sure someone is going to tell me to just go twin webbers, but what is so much better about webbers than su's?
Author:  mattsmadmini [ Tue Dec 04, 2012 10:04 am ]
Post subject: 
Small bore or big bore engine?

I'd go with the twin web's or dellortos or be really cool and get a set of r1 quads... the hs2's wouldn't be worth the effort in my minds eye when there are so many other options available
Author:  TheMiniMan [ Tue Dec 04, 2012 11:14 am ]
Post subject: 
If it`s one of those cheap 7-port heads from the states then i`d seriously look at fixing up the ports & valves & their seats etc before i did anything

you will get way more than 42kw`s just doing that

even before you start talking decent carbs

but if it were me then i`d inject it too... after you fix the head that is :-)

edit--> Oh & to help maybe answer your question about the quad carbs idea ,,, maybe quad HIF38s would be better,,, there`s probably not enough room to fit all four HS2`s in there with all the float bowls in the way,,, maybe face up/ dummy-up a set & see first yeah???
Author:  Morris 1100 [ Tue Dec 04, 2012 4:09 pm ]
Post subject: 
Image
Author:  Lillee [ Tue Dec 04, 2012 4:23 pm ]
Post subject:  Re: Quad hs2's?
princess wrote:
Also I'm sure someone is going to tell me to just go twin webbers, but what is so much better about webbers than su's?


The ability to select separate idle, air and fuel jets as opposed to a single needle that has everything, for one

As per above, is this a 998, 1098 or 1275? if the former then 75ish hp at the flywheel (30% running gear loss) is not bad already in my book. If 1275 or bugger then yeah look at valves and ports as Matt says. What exhaust are you running? ID
Author:  smac [ Tue Dec 04, 2012 4:33 pm ]
Post subject:  Re: Quad hs2's?
Lillee wrote:
princess wrote:
Also I'm sure someone is going to tell me to just go twin webbers, but what is so much better about webbers than su's?


The ability to select separate idle, air and fuel jets as opposed to a single needle that has everything, for one



errrm...the humble SU has far more adjustment available to it than a side draft. The problem is just finding somebody who knows how to do it. There are clubs, and knives, but more people know how to shape a club than sharpen knives.....
Author:  drmini in aust [ Tue Dec 04, 2012 6:51 pm ]
Post subject:  Re: Quad hs2's?
smac wrote:
Lillee wrote:
princess wrote:
Also I'm sure someone is going to tell me to just go twin webbers, but what is so much better about webbers than su's?


The ability to select separate idle, air and fuel jets as opposed to a single needle that has everything, for one



errrm...the humble SU has far more adjustment available to it than a side draft. The problem is just finding somebody who knows how to do it. There are clubs, and knives, but more people know how to shape a club than sharpen knives.....


Tuning SUs on a modified motor, you are never sure if the 1 of 700+ ? needles you have is the right one. If you can't find the `right one' then you need a `needle sharpener', aka a file- and someone who knows how to use it. There are not many of these gurus about.

I like my `Innovate' A/F ratio meter and Dellorto jet selection. 8)
Author:  Nicho [ Tue Dec 04, 2012 8:13 pm ]
Post subject: 
I say go for the Quads. I rekon they would look cool as and NO ONE else would have the balls to give it a go. The easier option of twin webers is less fuss.
I look forward to seeing what option you take and how much effort for HP is required. Even if the gains are not as high as the webers HOW many others wil you see with the same set up and unless your racing it why would the maximum HP make a difference. When people see the quads I'm sure they will stand and ogle for hours
Author:  princess [ Tue Dec 04, 2012 9:54 pm ]
Post subject: 
a bit more information, im currently running a slightly worked 1310 on a 5port head. im looking to do this around feb next year, so dont hold your breath waiting for results. quad hs2's just seems like an orgasm to my inner car maniac.

im currently running about a 9.0 compression ratio and a 1 3/4" exhaust. but with the new head ill be wanting to port out the exhaust and run a ~11.0 compression ratio. i want to get about 75kw at the wheels before going crazy in a few years with the 16v KAD kit and a supercharger too
Author:  Kennomini [ Tue Dec 04, 2012 10:09 pm ]
Post subject: 
Well seeing as the head is off it talk to some good tuners about the ports and valves, you mose well get that part sorted and out of the way.
Is it in a round or square nose mini?
Author:  kirby [ Tue Dec 04, 2012 10:28 pm ]
Post subject: 
Bah, Ive been planning on putting quad electric HS2s on a 7port but now Ill just have to find something else. Its obviously more show than go but I think it would look cool 8)
Author:  smac [ Wed Dec 05, 2012 6:44 pm ]
Post subject:  Re: Quad hs2's?
drmini in aust wrote:
smac wrote:
Lillee wrote:
princess wrote:
Also I'm sure someone is going to tell me to just go twin webbers, but what is so much better about webbers than su's?


The ability to select separate idle, air and fuel jets as opposed to a single needle that has everything, for one



errrm...the humble SU has far more adjustment available to it than a side draft. The problem is just finding somebody who knows how to do it. There are clubs, and knives, but more people know how to shape a club than sharpen knives.....


Tuning SUs on a modified motor, you are never sure if the 1 of 700+ ? needles you have is the right one. If you can't find the `right one' then you need a `needle sharpener', aka a file- and someone who knows how to use it. There are not many of these gurus about.

I like my `Innovate' A/F ratio meter and Dellorto jet selection. 8)


Yeah yeah I know, I'm just being pedantic. :lol: I agree completely that because of the knowledge and tools around us it is likely a sidedraft may be a more practical option for a modified or oddball engine, I'm just saying it's not correct to imply that the SU is in someway restricted in it's tuning abilities. By it's very design it's more tunable...in theory :wink:
Author:  1071 S [ Thu Dec 06, 2012 8:47 pm ]
Post subject: 
"By it's very design it's more tunable...in theory..."...

I guess all the serious racers use Webers (if they have to use carbs) .. because they're more concerned with results than theory????

Cheers, Ian
Author:  smac [ Fri Dec 07, 2012 5:29 am ]
Post subject: 
1071 S wrote:
"By it's very design it's more tunable...in theory..."...

I guess all the serious racers use Webers (if they have to use carbs) .. because they're more concerned with results than theory????

Cheers, Ian


Yeah, seeing as they are so interested in fine adjustments from idle right up through all part throttle and load situations, rather than only being interested in WOT. (I figure answer sarcasm with sarcasm :wink: )
Author:  meeni [ Fri Dec 07, 2012 6:21 am ]
Post subject: 
Put r1 carbs on it, they're basically a modern version of an s.u and they aren't as tall, I reckon s.u's would stick out the top of the bonnet pretty badly
Page 1 of 2 All times are UTC + 10 hours
Powered by phpBB® Forum Software © phpBB Group
http://www.phpbb.com/