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| Vizard carby modifications https://www.ausmini.com/forums/viewtopic.php?f=2&t=81495 |
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| Author: | 1380 K [ Mon May 20, 2013 1:36 pm ] |
| Post subject: | Vizard carby modifications |
Has anybody performed the modification to there carby that vizard states in his How to tune an a series engine book? Just wanting some feedback on what you guys think of the mods. Cheers, Tom |
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| Author: | kirby [ Mon May 20, 2013 1:45 pm ] |
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Need some more info. Which carby and which modification/modifications? |
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| Author: | drmini in aust [ Mon May 20, 2013 1:47 pm ] |
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Mods to throttle shaft are OK, but don't modify the jet bridge as he shows... people here have had dramas with that mod. |
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| Author: | 1380 K [ Mon May 20, 2013 1:49 pm ] |
| Post subject: | |
Sorry. He has a part in his book about increasing flow through su carbs. Eg reducing spindle and butterfly thickness. Cutting off butterfly screws obstructing bore of throttle body. |
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| Author: | drmini in aust [ Mon May 20, 2013 1:52 pm ] |
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I did the throttle shaft & screw mods many years ago (well before Vizard wrote it up)- I think for a road car it's a bit of a waste of time. Most of this stuff (Clive Trickey started it) was to get a bit of flow through an HS2 carby. Get a bigger carby... better idea these days. 
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| Author: | 1380 K [ Mon May 20, 2013 2:00 pm ] |
| Post subject: | |
Yeah I'm pretty much just doing it for a bit of fun more than anything. Just was wondering if by cutting half of the spindle away and filing the otherside leaving more obstruction on one side of the butterfly than the other would create turbulence that could effect the Venturi effect in the carb. Hope this makes some sense haha. It does in my head. |
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| Author: | JimL [ Mon May 20, 2013 2:43 pm ] |
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Sorry about the slight thread hack, but on the topic of carby mods, would it be worth attacking these burrs with a file? Its a HIF44 
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| Author: | simon k [ Mon May 20, 2013 7:03 pm ] |
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I did the flow mods to my twin 1.5"s and they worked well. Recently one of them was put onto a standard 1275 in a clubman, replacing a worn 1.5 - the owner was very very happy |
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| Author: | 1380 K [ Mon May 20, 2013 8:57 pm ] |
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Don't suppose you have any pictures? I was a bit hesitant to make the spindle so thin where the butterfly bolts up to it. |
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| Author: | simon k [ Mon May 20, 2013 10:19 pm ] |
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1380 K wrote: Don't suppose you have any pictures? I was a bit hesitant to make the spindle so thin where the butterfly bolts up to it.
no, but I do now.... here's the shaft, I reckon every little bit helps, but I didn't do a lot, just ground flats on them - I loctite the screws in, can't actually get them out again without wrecking the heads 
here's where I did most of the work, get rid of the ridges, open out the square area around where the piston comes down 
don't touch this bit!!! 
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| Author: | 1380 K [ Tue May 21, 2013 7:51 pm ] |
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Awesome. I'm hoping to get a bit more done on the weekend. In between rebuilding me gearbox and re ringing my engine. To many things going on. |
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