Check your PM's
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| Anyone running twin 1'' 3/4 S.U's https://www.ausmini.com/forums/viewtopic.php?f=2&t=40283 |
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| Author: | suffolk [ Tue Mar 18, 2008 4:40 pm ] |
| Post subject: | Anyone running twin 1'' 3/4 S.U's |
Hello,Just wanting to know if anyones running 1'' 3/4 SU's ? And what you think of them are they to big? or not..I have a fairly worked head and am trying to get a idea as to what they are like..Also would like to know what jet size ,needles and springs you use, You can P.M me if you like..Cheers |
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| Author: | michaelb [ Tue Mar 18, 2008 7:07 pm ] |
| Post subject: | |
Hi, I have twin 1 1/2' on my Cooper S which has been dynoed at around 65 - 70hp at the wheels. 1275 +40, Kent Megadyne 286, 12G940 Head modified with Mk1 valves. Longman extractors with RC40. I guess it depends on the size of the motor but I think 1 3/4" may be too big. |
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| Author: | suffolk [ Tue Mar 18, 2008 7:26 pm ] |
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There's a guy over here in the west that's running them...Just got to somehow get in contact with him!! I think the overkill would highly depend on jet size and needle selection..I to am running twin 1''1/2''s ...But am on one of the richest needles for 90'' jets,may step up to 100'' jets...Just seeing if anyone has been there done that to see how things went...anyone?? Thanks |
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| Author: | sports850 [ Tue Mar 18, 2008 7:27 pm ] |
| Post subject: | |
Check your PM's
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| Author: | suffolk [ Tue Mar 18, 2008 7:36 pm ] |
| Post subject: | |
Message recieved...Cheers!! Still interested in hearing from anyone who is ,or has run this type of setup...Thanks. |
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| Author: | smac [ Tue Mar 18, 2008 7:40 pm ] |
| Post subject: | |
I'm keen to see more discussion on this cause there's a WHOLE lot of crap on the topic. Here's what I'm on about: If you read anything on "why is a 1 3/4 (or equivalent) just as good or better than twin 1 1/4's then you'll see a bunch of stuff on how siamese port heads and twins work, and how each port only ever sees one carb etc so 1 3/4 is better etc etc But hold on, if each port only sees one carb, then how can twin 11/4 be any where NEAR enough.....and how come 1 3/4 can be too much??? It can't go both ways....so I just wish I could get some sense on the topic..... |
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| Author: | sports850 [ Tue Mar 18, 2008 7:42 pm ] |
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Hopefully the person I told suffolk about will give some more details but he was running twin 1 3/4's on his mini last I'd heard . So long as the motor is "big enough" to get the air flow through them you should be fine . I've seen a full race 998 with twin 1 3/4's but everything only worked on it at high revs . |
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| Author: | suffolk [ Tue Mar 18, 2008 7:54 pm ] |
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Exactly!! The book ive got says 2x1''1/4 850cc t0 1500cc 50 t0 100 Bhp 2x1''1/2 1000cc to 1800cc aprox 60 to 110 Bhp 2x1''3/4 1500cc to 3000cc 105 to 170 Bhp Not forgetting that they slow down or fade of at the higher end of the BHP figures above..Cheers |
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| Author: | LS1380 [ Wed Mar 19, 2008 7:15 pm ] |
| Post subject: | |
sports850 wrote: Hopefully the person I told suffolk about will give some more details but he was running twin 1 3/4's on his mini last I'd heard . So long as the motor is "big enough" to get the air flow through them you should be fine . I've seen a full race 998 with twin 1 3/4's but everything only worked on it at high revs .
Yes there still on there last time I looked 
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| Author: | clubmn [ Thu Mar 20, 2008 9:53 am ] |
| Post subject: | mm1275 |
here are my 1 3/4's. 
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| Author: | mattsmadmini [ Thu Mar 20, 2008 9:58 am ] |
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very neat clubmn! love the engine colour to! |
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| Author: | TheMiniMan [ Thu Mar 20, 2008 2:13 pm ] |
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I LOVE them,,, they`re my favourite well,,, maybe except for my twin 2" set up 
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| Author: | clubmn [ Thu Mar 20, 2008 2:40 pm ] |
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TheMiniMan wrote: I LOVE them,,, they`re my favourite
well,,, maybe except for my twin 2" set up 4 what application |
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| Author: | TheMiniMan [ Thu Mar 20, 2008 4:40 pm ] |
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My little roady 1510cc donk |
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| Author: | suffolk [ Thu Mar 20, 2008 5:09 pm ] |
| Post subject: | |
Thanks for all the reply's...Ive heard nothing but positive feedback on 1'' 3/4 SU's...I'm getting a set to try out in the future...It will be just a matter of getting the right spring and needle combo...and ''Bobs your Aunty''..Cheers 
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