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| what kind of carb setup would be better? https://www.ausmini.com/forums/viewtopic.php?f=2&t=68632 |
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| Author: | minideluxe [ Tue Feb 01, 2011 3:42 pm ] |
| Post subject: | what kind of carb setup would be better? |
I'm too much of a virgin in the mini scene to figure this out  so i am wondering firstly what's the diffence with HS2 and HS4 twin su's and secondly what would i need to do to make it run with an 1100(modifications that is) properly or would i be wasting time/money effort and run a 1275 with bore ect ect?
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| Author: | mattsmadmini [ Tue Feb 01, 2011 3:47 pm ] |
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HS2 is 1 1/4" carby HS4 is 1 1/2" carby on a modded 1100, a hs4 or even a hs6 would be suitable, but hell, if ya got a 1275 lying around, get on it 
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| Author: | poeee [ Tue Feb 01, 2011 4:14 pm ] |
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Twin HS2's or preferably a single HS4 on a good manifold is what I would run on an 1100. |
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| Author: | TheMiniMan [ Tue Feb 01, 2011 4:26 pm ] |
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there`s nothing wrong with twin 1&1/2s on a small bore,,, "IF" you already have them that is but not sure it`s worth the time. money & effort to go out of your way to get them just because i said they`d be cool... a single 1&1/2 is fine really if you have a 1275 sitting there looking pretty & if you already have said twin 1&1/2 carbs set up, sitting there looking pretty, then bung them together my friend 
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| Author: | minideluxe [ Tue Feb 01, 2011 5:23 pm ] |
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i wish i had a 1275 lying around just thought id add that in cause the 1100 in it has overheated! probably as a result of driving it around after sitting in an old mans shed for 4 years so next month the whole motor will come out and get a going over/rebuild and thinking which way to go, whether to stick with this motor and modd it(ie twin su's, turbo or supercharge setup) or source a 1275 or just leave it mild pending overall costs considering the 1098 k motor was already in it not the original motor setup of the 998 so the original factor is not an option but as Clarkson says 'More Power'is a good argument |
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| Author: | minideluxe [ Tue Feb 01, 2011 5:26 pm ] |
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poeee wrote: Twin HS2's or preferably a single HS4 on a good manifold is what I would run on an 1100.
How about twin HS4? |
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| Author: | blue_deluxe [ Tue Feb 01, 2011 5:27 pm ] |
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Is it a daily driver? If it is get it rebuilt stock, maybe a light head job if its cheap. Then buy a 1275 and build that for a fast road engine. Then slot it in down the track and your laughing. |
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| Author: | minideluxe [ Tue Feb 01, 2011 5:33 pm ] |
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blue_deluxe wrote: Is it a daily driver? If it is get it rebuilt stock, maybe a light head job if its cheap.
Then buy a 1275 and build that for a fast road engine. Then slot it in down the track and your laughing. Good advise considering when it finally gets back on the road she'll be a daily. Just get excited when i have to pull a motor i always think 'maybe i'll just do this and it might go better if i alter it like that' |
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| Author: | 1stmotionshaft [ Tue Feb 01, 2011 6:55 pm ] |
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TheMiniMan wrote: there`s nothing wrong with twin 1&1/2s on a small bore,,, "IF" you already have them that is
Nothin'n wrong at all with a coupla BIG JUGS.. Go twin HS4's |
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| Author: | CARTER_GT [ Tue Feb 01, 2011 7:34 pm ] |
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single HS4 on a good manifold will be ample. |
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| Author: | gafmo [ Tue Feb 01, 2011 7:43 pm ] |
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What I have Just built a 998 with a 1098 crank nice head, nice Cam & nice exhaust I have a 1 1/2 on a good inlet manifold that matches with the head & SU. Its goes good My wifes daily drive is a 1098 with bigger Cam and head has had more work with the Carb matching the head and the exhaust is also a LCB. It has a HIF44 (1 3/4) carb and have never had to touch it. In say all this you could also go a Dellorto 40 as many do also |
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| Author: | minideluxe [ Tue Feb 01, 2011 11:03 pm ] |
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gafmo wrote: In say all this you could also go a Dellorto 40 as many do also
okay then....what is and does the dellorto 40 do then? webber is it? |
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| Author: | Convertible Mini [ Wed Feb 02, 2011 5:01 am ] |
| Post subject: | 1275 Engines |
Gone are the days when people left 1275 engines lying around... These days they are kept wrapped up in Cotton wool. That is how I keep my stash of them any way !! |
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| Author: | drmini in aust [ Wed Feb 02, 2011 6:23 pm ] |
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minideluxe wrote: gafmo wrote: In say all this you could also go a Dellorto 40 as many do also okay then....what is and does the dellorto 40 do then? webber is it? A 40mm Dellorto is much the same as a 40DCOE Weber. But they are cheaper to buy s/h, easier to tune (IMO) and are more economical on a road car than a Weber is. Usually. 
Advantages over single or twin SUs- 1. Throttle shafts have ball bearings and seals, so they don't wear and suck air like SUs do. 2. They are basically 2 carbs in 1 body on a common throttle shaft so don't need synchronising like twin SUs do. 3. Easier to tune, as they have real air and fuel jets, not 1 out of 700+ needles to pick. 4. Once jetted right, they stay in tune..... 
5. Better throttle response, once on cam. Disadvantages- 1. Poorer low speed throttle response. So you just don't treat the throttle like a light switch. 2. Noise/music- they ain't quiet. 3. They do use more fuel than SUs do. But, it's worth it. 
Here's a Dellorto (45mm) on my 1412 stroker, on GR's engine dyno. A 40mm looks the same. 
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| Author: | MG Rocket [ Wed Feb 02, 2011 6:37 pm ] |
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drmini in aust wrote: A 40mm Dellorto is much the same as a 40DCOE Weber.
......... easier to tune (IMO) and are more economical on a road car than a Weber is. Usually. Doc why is this the case....Japanese manufacturing? |
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