each piston in the engine only sees one carb anyway,,, so a stock 1275 running around on a single 1&3/4 is quite fine,,, then twins is just the same only with less manifold restriction
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| twin 1 3/4 carbs bmc 731 cam https://www.ausmini.com/forums/viewtopic.php?f=2&t=50287 |
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| Author: | scudley [ Sat Feb 14, 2009 5:18 pm ] |
| Post subject: | twin 1 3/4 carbs bmc 731 cam |
has any one got this combo has anyone got twin 1 3/4 in SU's on a 1275 if so how does it go what needles have just ordered a set of twin 1 3/4 |
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| Author: | TheMiniMan [ Sat Feb 14, 2009 5:36 pm ] |
| Post subject: | |
I ve run twin 1&3/4 carbs on my big bore donks for years, love em I would just shove some OA6 needles & a pair of red springs in there for starters & go from there it all depends on so many other variables as to what you may end up with on your particular engine,,, but the OA6s & reds will get you going without a hic-up & will be all wonderful to start with |
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| Author: | clubmn [ Sat Feb 14, 2009 6:08 pm ] |
| Post subject: | j |
I run RR needles with red springs... Think i selected them as that is what was sudgested in vizards book.. |
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| Author: | sitnlo62 [ Sat Feb 14, 2009 9:40 pm ] |
| Post subject: | |
I use 13/4 SU's on my 1360 which is in a fairly high state of tune. I really couldn't recomend them on a stocker or even a mild motor though. Red springs and KW needles work for me. As matt says OA6 is a great starting point! Dave |
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| Author: | TheMiniMan [ Sat Feb 14, 2009 9:43 pm ] |
| Post subject: | |
each piston in the engine only sees one carb anyway,,, so a stock 1275 running around on a single 1&3/4 is quite fine,,, then twins is just the same only with less manifold restriction
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| Author: | kiwiinwgtn [ Mon Feb 16, 2009 5:51 pm ] |
| Post subject: | |
this a hijack so i appolgise in advance twin 1.5 Su with a re13 cam Needles would be Ta in advance |
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| Author: | drmini in aust [ Mon Feb 16, 2009 5:54 pm ] |
| Post subject: | |
kiwiinwgtn wrote: this a hijack so i appolgise in advance
twin 1.5 Su with a re13 cam Needles would be Ta in advance #6 worked for me in Barney, 1293cc, twin HS4s, cam was a Wade 104 with 1.5 rockers (so similar lift and timing to an RE13 and stock rockers). |
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| Author: | LS1380 [ Mon Feb 16, 2009 9:45 pm ] |
| Post subject: | Re: j |
clubmn wrote: I run RR needles with red springs... Think i selected them as that is what was sudgested in vizards book..
Did the same-but also got it set up on a dyno. Also just as important is your inlet manifold and filter set-up. I'm running with K&N Filters now with Maniflow manifold setup for 1 3/4. 
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