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Beanie
 Post subject: Weber tuning
PostPosted: Thu Aug 14, 2008 7:50 pm 
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Hi all i just put a 40mm dcoe weber on my car and wanted to know what size jets and other stuff it should have in it for my motor ..
It's only a standard 1275A+ cooper motor with maniflow extractors and a swiftune SW5 cam (very mild ) car just sounds a little flat ..
any advice would be greatly appreciated ..


Thanks beanie

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John Smidt
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PostPosted: Thu Aug 14, 2008 8:52 pm 
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This will Probably start a heated debate, But If was me I would take it off and put a single 1-3/4" SU on, Unless you intend to use for serious competition
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superSeven
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PostPosted: Thu Aug 14, 2008 8:57 pm 
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John Smidt wrote:
...unless you intend to use for serious competition


some people do it for the noise... :twisted:
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Beanie
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PostPosted: Thu Aug 14, 2008 8:58 pm 
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Yeah it will be used for serious racing ... the stock motor is only in there to get me back out on the track ...
Im building a hot 1380 up to go racing with the historic boys latter in the year ...

Beanie

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John Smidt
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PostPosted: Thu Aug 14, 2008 9:06 pm 
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In That case Graham Russell would be the person to talk to, In My opinion
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justminis
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PostPosted: Thu Aug 14, 2008 9:11 pm 
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John Smidt wrote:
In That case Graham Russell would be the person to talk to, In My opinion


In my opinion too, and a 45 DCOE would be better for serious racing than the 40 :D

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Beanie
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PostPosted: Fri Aug 15, 2008 8:32 am 
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I bought the 40mm dcoe because it was cheap ...
the largest size choke that i wanna run is 36mm and i can buy that for the 40mm weber so why not ... i only payed $300 for the weber linkage and 4 inch manifold ...

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drmini in aust
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PostPosted: Fri Aug 15, 2008 8:57 am 
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There is a so-called rule of 5 for Weber and Dellorto sidedraft carbs, they don't work properly if the choke is bigger than (carb size -5mm).
So really a 35 choke will stop it..
I agree a 40DCOE is too small for a race 1275, my roady 1360 is running a 45 with 38 chokes. :lol:

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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mad-mk1
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PostPosted: Fri Aug 15, 2008 12:19 pm 
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getting things ready for sunday beanie!
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Beanie
 Post subject:
PostPosted: Fri Aug 15, 2008 3:24 pm 
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Yep, going Sprinting at Mallala on Sunday :D

Right, so no-one has been able to give me an answer other than change the carb.

:?

Anywho, any ideas so as to what main jets, idles, or pump jets i might need? The ign timing is set right, but it still sounds very flat. There is a box of bits i can rummage through, but any clues on what i should be looking for?

C'mon guys, you lot are usually most helpful. Does it help if i say please? :lol:

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drmini in aust
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PostPosted: Fri Aug 15, 2008 4:58 pm 
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Sorry but all my carby book specs on 1275s are for a 45DCOE Weber, or 45DHLA Dellorto.

I would put 34 or 35mm chokes in it for starters.. :wink:

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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1310/71
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PostPosted: Fri Aug 15, 2008 6:57 pm 
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Don't the Vizard books have a page or two with suggested starting point?
I will look after dinner if no one beats me to it.
KB

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lil-ute
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PostPosted: Fri Aug 15, 2008 7:22 pm 
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i had a 45mm on my car what a buzz it went like a shower of crap willson automotive built it in hobart (tasmania) daniel is the head man he knows what he is doing james does the rest and betweeen them get one of their engines you will love it webers are bloody noisey get a 1 3/4 su

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busier than a 0ne legged man in a butt kicking competion
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1310/71
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PostPosted: Fri Aug 15, 2008 7:33 pm 
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Still haven't dinner but hey,
Vizard:
40DCOE 1275 +modified head

Choke 35
Main jet 145
Air Correction 180
Em Tube F16
Pump jet 45
Idle 50F2

compared to 45mm 1275 standard; 1275 modified head/cam/extractor
choke 35;38
Main jet 150; 165-170
Air Corr 180; 180
Em Tube F2 for both
Pump jet 40; 45
Idle 50F2 for both
Aux vent 4.5 for both

KB

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Beanie
 Post subject:
PostPosted: Sat Aug 16, 2008 11:00 am 
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Awesome. Cheers for that.

Shall go and have a play now

:D

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