Guest olschltoy Posted July 28, 2005 Share Posted July 28, 2005 hmmm.*scratches head* some people say sidies are better sounding but what about overall performance wise?? Quote Link to comment Share on other sites More sharing options...
L0WMK2 Posted July 28, 2005 Share Posted July 28, 2005 im pretty sure side draughts give more hp? Quote Link to comment Share on other sites More sharing options...
Guest escort_boy Posted July 28, 2005 Share Posted July 28, 2005 im pretty sure this has been covered Quote Link to comment Share on other sites More sharing options...
TygerTung Posted July 28, 2005 Share Posted July 28, 2005 Sidedraughts are better for performance, and they also sound better, but the downside is they're more expensive to buy. Downdraughts have no advantages except for it you have no money you buy them then. Quote Link to comment Share on other sites More sharing options...
Defcon Posted July 28, 2005 Share Posted July 28, 2005 Very wipe topic to cover, but really, a carb should be chosen to suit the engine, not the other way round. T here are so many differnt carb's avalible its not funny. There is no real answer to this question. You can have a single down draught like a 32/36 or 34 adm or the v8 sorta range of carbs, holly's n demons ect. I have twin down draughts, exactly the same as a side draught but made for verticle aplication. The only disadvatane of this type of carb over a sidey is it doesnt flow as well because of the 90'' bend. But i doubt you'd notice the difference if you bolted up the same size side draughts to my engine. Cant really attempt to answer the question with out any details of your engine. Def' Quote Link to comment Share on other sites More sharing options...
lowlancer Posted July 28, 2005 Share Posted July 28, 2005 Hey I have a question. I got the 32/36 bolted on and running on the 4G63, but it's clearly running lean. Aside from re-jetting, (not worth prohibitive cost) is there anything I can do to increase fuel flow? I have no idea which screws do what on a weber, so maybe that's a good start! I eventually plan on running twin sidedraught 45s or something to that effect, but need it to be going now. My standard carb=in bits and many of aforementioned bits missing. Man that made me sound like the chronic n00b, spose I am really when it comes to carbs. Quote Link to comment Share on other sites More sharing options...
Toucan Posted July 28, 2005 Share Posted July 28, 2005 You want to adjust the air/fuel mixture screw. I've tried playing around with it but its kind of hard to tell what your doing unless your good with carbs. Your supposed to turn the idle up a bit, then fiddle with the screw till you get it right and then wind the idle down so that it runs smooth. It's fairly obvious which screw it is I think. Quote Link to comment Share on other sites More sharing options...
L0WMK2 Posted July 28, 2005 Share Posted July 28, 2005 look at a haynes manual get someone to scan a copy of the page with the carbs on it? Quote Link to comment Share on other sites More sharing options...
zep Posted July 28, 2005 Share Posted July 28, 2005 I'm pretty sure that carb only has 1 screw on it. Right near the bottom. Quote Link to comment Share on other sites More sharing options...
lowlancer Posted July 28, 2005 Share Posted July 28, 2005 Has 3, including ide speed screw And the one near the bottom is air/fuel? Quote Link to comment Share on other sites More sharing options...
Jerm Posted July 28, 2005 Share Posted July 28, 2005 You want to adjust the air/fuel mixture screw. I've tried playing around with it but its kind of hard to tell what your doing unless your good with carbs. Your supposed to turn the idle up a bit, then fiddle with the screw till you get it right and then wind the idle down so that it runs smooth. It's fairly obvious which screw it is I think. What did the carb come off? why don't you take the jets out and give them a drill i fyou have access to precision drill bits? The screw that goes into the baseplate of the carb in on an angle from the throttle linkage end is the mixture screw... its quite bad to run your engine lean though.. try screwing it in untill it is about to stall then on 1.33 - 1.5 turns outwards... Quote Link to comment Share on other sites More sharing options...
lowlancer Posted July 28, 2005 Share Posted July 28, 2005 Yeah I know it's bad, I'm just not familiar with webers Don't understand "then on 1.33 - 1.5 turns outwards" Then on? You mean screw it back the way I just screwed it? Quote Link to comment Share on other sites More sharing options...
lowlancer Posted July 28, 2005 Share Posted July 28, 2005 Ahhhh now I have it. I understand. Quote Link to comment Share on other sites More sharing options...
RT Posted July 28, 2005 Share Posted July 28, 2005 man, everytime I tried to tune a carb it got progressively worse each time I touched it. Quote Link to comment Share on other sites More sharing options...
lowlancer Posted July 28, 2005 Share Posted July 28, 2005 Hahahaha yeah know how you feel RT Anyway went and did that, screw was WAY out, took about 5-6 turns to get it to the point where it was about to stall. Then did just under 1.5 turns out, and turned idle down a touch, seems to go ok, won't know till the builders get the fuck out of my driveway so I can take it for a test. One thing I've noticed since putting this carb on, is the way a lot more water and dirt comes out of the exhaust when cold. Not HEAPS, but enough to notice that it's clearly more than the solex. Not really an issue since water=product of combustion, but interesting all the same Quote Link to comment Share on other sites More sharing options...
kyteler Posted July 29, 2005 Share Posted July 29, 2005 ITB's w/ EFi Quote Link to comment Share on other sites More sharing options...
Jerm Posted July 29, 2005 Share Posted July 29, 2005 man, everytime I tried to tune a carb it got progressively worse each time I touched it. Haha yeah that happens... or when your jetting carbs you can't remember if its better or worse and shit... and its a cunt to change it back the anoying thing is you have to go to far then go back but its hard to tell whats happening Quote Link to comment Share on other sites More sharing options...
Jerm Posted July 29, 2005 Share Posted July 29, 2005 Hahahaha yeah know how you feel RTAnyway went and did that, screw was WAY out, took about 5-6 turns to get it to the point where it was about to stall. Then did just under 1.5 turns out, and turned idle down a touch, seems to go ok, won't know till the builders get the fuck out of my driveway so I can take it for a test. One thing I've noticed since putting this carb on, is the way a lot more water and dirt comes out of the exhaust when cold. Not HEAPS, but enough to notice that it's clearly more than the solex. Not really an issue since water=product of combustion, but interesting all the same Water a product of combustion? i really don't think so.... but i could be wrong.. Quote Link to comment Share on other sites More sharing options...
durty Posted July 29, 2005 Share Posted July 29, 2005 A petrol engine is a classic example of the utilisation of a machine to produce work from the combustion of a fuel which is, in this case, petrol. If we represent petrol as being composed of n-octane, we can write a global reaction of n-octane oxidation: C8H18 + 12.5O2 -> 8CO2 + 9H2O The reaction above indicates the complete combustion of octane to give CO2 and H2O. In the engine however, the reaction is simply not represented by the above equation and in fact the products from the exhaust contains more than just CO2 and H2O, which depends on the amount of air that has been added with the fuel. The chemical processes involved in the engine are complex. It entails a complex free-radical chain reaction mechanism, involving many chain carriers and branching agents with the ability to react in a number of different ways. http://www.madsci.org/posts/archives/ma ... .Ch.r.html Quote Link to comment Share on other sites More sharing options...
lowlancer Posted July 29, 2005 Share Posted July 29, 2005 So what, more air/leaner=more water? And yes, water is a product of combustion Jerm. Quote Link to comment Share on other sites More sharing options...
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