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All-Terrain Lawn Mower Association > Miscellaneous > Off-Topic > Topic: 2 carbs
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MOWchanic
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« on: February 03, 2008, 07:11:57 PM »
Hey Chris,
Searching Heymow.com for a topic on twin carbs and came up with a post from you showing where you had twin carbs from a 12 hp briggs on your oppo. Did you ever get it running with them on there?? Did it work well?
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Chris
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« Reply #1 on: February 04, 2008, 06:46:14 AM »
That wasn't my picture actually, I found that on the net somewhere and was inquiring to how well it would actually work.

Looks cool though, don't it?
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Just because you move up in a class doesn't mean that you'll "loose" the "race", it just means that you're building a better, more capable machine.
MOWchanic
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« Reply #2 on: February 04, 2008, 01:40:45 PM »
Yeah it does look cool... But I bet it would be pain to tune right....
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« Reply #3 on: February 04, 2008, 03:40:17 PM »
Quote from: MOWchanic on February 04, 2008, 01:40:45 PM
Yeah it does look cool... But I bet it would be pain to tune right....

I don't know, lots of bug heads run dual carbs on vw engines. it only gets complicated if they are on seperate manifolds (direct into a side) if they share an intake, then its 1/2 the amount from each, and it would probably be MORE forgiving since you'd have 2 places to adjust from, or you could make one a mechanical secondary, and only 1 would be doing anything at idle. the smaller jets would give you a wider range each.....

1 per cylinder... that would suck and would be a nightmare. just making them pull at the same time when you get out in the real world would be enough to make you pull hair out.
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« Reply #4 on: February 04, 2008, 07:15:10 PM »
i saw a pic but it was much bigger.. you could acaully see how it was set up..

its just the initial set up ( tuning ) that would be a pain.. but once you had it down im sure it would be good.. is there a need for it? no not on a stock opposed.. i have one here with good oil, tuned good ( only a low speed adjust on this one ) it would spin 6000RPM all day!!!

now with a build apposed im sure youd see a little bit of a gain.. but in SOLTRA there were alotta opposed engines running the "stock" carb and there was no problems...
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« Reply #5 on: February 04, 2008, 07:26:38 PM »
dollar for dollar, I'd rather just put a bigger carb on. or one off a bike that has more options to dial in (like jets).
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« Reply #6 on: February 04, 2008, 08:03:47 PM »
Mikuni slide type would be the best carb you could use.Idle jets low end jets main jets and high speed jets.Cant get any better than that.
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« Reply #7 on: February 05, 2008, 07:11:02 AM »


http://www.heymow.com/index.php?topic=4817.msg53832#msg53832
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Just because you move up in a class doesn't mean that you'll "loose" the "race", it just means that you're building a better, more capable machine.
speeddemon0308
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« Reply #8 on: February 07, 2008, 08:39:11 PM »
my buddy has a slide carb ( 22 MM i think? ) on his 5hp brings.. it runs REALLY rich at idle.. ( sounds cammed!) and when you open it up.. you know you opend it up!!!
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« Reply #9 on: February 07, 2008, 09:33:17 PM »
bikes run multple carbs usually one per cyl so one should easily find solutions to seting them up by speaking to somebody who can tune motorcycle carbs
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« Reply #10 on: February 08, 2008, 07:40:49 AM »
Quote from: speeddemon0308 on February 07, 2008, 08:39:11 PM
my buddy has a slide carb ( 22 MM i think? ) on his 5hp brings.. it runs REALLY rich at idle.. ( sounds cammed!) and when you open it up.. you know you opend it up!!!
tell him to put a smaller pilot jet in it and that will fix the idle problem.
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