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| Standard 1275 engine with weber - TUNING https://www.ausmini.com/forums/viewtopic.php?f=2&t=73635 |
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| Author: | 1098 [ Wed Oct 19, 2011 11:04 am ] |
| Post subject: | Standard 1275 engine with weber - TUNING |
Hi all, I am changing over to a Weber carburettor for my 1275, just to give it a go over the HS6 I have on it currently. I will be buying new - and the guys I am buying off say they can jet it to suit when I buy it. So I ask you all: what is a good base tune for my engine? It's a large journal 1275, standard head (A+), 123 distributor. Everything is standard apart from that. Any help greatly appreciated. As for manifold, it will either get a swan neck, or a 3 inch style. Cheers. Tyson. |
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| Author: | TheMiniMan [ Wed Oct 19, 2011 11:19 am ] |
| Post subject: | |
i`d suggest the redline/warnford 3&1/2 inch manifold & just as a starting base--> idle jets-50F9 pump jets 50 block off the pump by-pass jet (inside the bottom of the float bowl) aux ventures 3.5 chokes 34 emulsion tubes F11 mains 145 air correctors 180 |
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| Author: | Beanie [ Thu Oct 20, 2011 8:09 am ] |
| Post subject: | |
TheMiniMan wrote: i`d suggest the redline/warnford 3&1/2 inch manifold
& just as a starting base--> idle jets-50F9 pump jets 50 block off the pump by-pass jet (inside the bottom of the float bowl) aux ventures 3.5 chokes 34 emulsion tubes F11 mains 145 air correctors 180 Yeah sounds good here too ... Except I use 4.5 aux ventures Matt you say block off the pump bypass Jett , how do you do this and why Cheers Beanie |
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| Author: | drmini in aust [ Thu Oct 20, 2011 8:18 am ] |
| Post subject: | |
Beanie, The reason this is done is to get more fuel per pump stroke by shutting the bleedback to the bowl. This is needed on a siamese port engine because you have 2 cylinders sucking on each port, not 1 as with an Alfa for example. With a Dellorto 45 you achieve the same result by increasing the pump stroke (adjust actuating rod locknuts). |
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