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| 2' SU Carby https://www.ausmini.com/forums/viewtopic.php?f=2&t=68293 |
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| Author: | Ollie88 [ Mon Jan 17, 2011 6:18 pm ] |
| Post subject: | 2' SU Carby |
Hi All, ive come across 2 2inch SU (well thats what my calipars tell me!) that and they were off a Jag. what my question is, ive only got a 998, so 2 big for mine, in the future if i upsize my engine, how well would they work? Cheers Ollie |
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| Author: | GT mowog [ Mon Jan 17, 2011 6:29 pm ] |
| Post subject: | |
The idea HP range for a single 2" SU is from 65 through to 115 HP. For twin 2" it would be 125 to 215 HP. The short of it is, if fiited to a 998, it would be over-carburated. You would loose a lot of low rev torque. |
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| Author: | Irish Yobbo [ Mon Jan 17, 2011 6:36 pm ] |
| Post subject: | |
For a 998, you're best with a 1.5" or two 1.25" A 1.75 would probably run well with a worked 998, but they're generally better for the bigger engines. I think a 2" would probably be a little too big for even a stock 1275 - they normally run with a 1.75. |
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| Author: | Ollie88 [ Mon Jan 17, 2011 7:18 pm ] |
| Post subject: | |
yeah i got a 1 1/2 that im keeping on my 998, but if i were to up size, the 2inch could work! thanks |
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| Author: | Kennomini [ Mon Jan 17, 2011 7:29 pm ] |
| Post subject: | |
I'd say use it on an over sized/worked 1275. Then I think you should ask is a single 2" SU better than twin 1" SU's (assuming they are on perfect manifolds). |
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| Author: | drmini in aust [ Mon Jan 17, 2011 7:36 pm ] |
| Post subject: | |
Kennomini wrote: I'd say use it on an over sized/worked 1275.
Then I think you should ask is a single 2" SU better than twin 1" SU's (assuming they are on perfect manifolds). Um.. it just doesn't work this way. putting 2 carbs onto a 5 port head, only 1 carb breathes at a time. So a single 1.5 can flow better than say twin 1.25s (assuming it's on a decent manifold, non-MOWOG)... 
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| Author: | Morris 1100 [ Mon Jan 17, 2011 7:41 pm ] |
| Post subject: | |
From the SU book... 
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| Author: | TheMiniMan [ Tue Jan 18, 2011 10:33 am ] |
| Post subject: | |
big big for the average road mini, but works well on my 1510cc 
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| Author: | poeee [ Wed Jan 19, 2011 9:43 am ] |
| Post subject: | |
You will get better results with a good inlet manifold and extractors and keeping your HS4. |
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