A.k.a.: Dave Butler Muffin Man
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posted on May 8th, 2007 at 06:26 AM
Engine is 2180.4cc
Power will depend on a lot of variables in the heads and cam and compression ratio,
but with those carbs(what venturi?) I woulds say that 100 to 120hp at the tyres
with massive torque would be a guess.
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That's mad Alan.
sewelly62
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posted on May 8th, 2007 at 07:32 AM
unsure of what cam it is it is fairly mild and really rideable. The engine is in a trike.
Really turns on the bulk of its power at around 2200 revs onwards. Currently running stock 1600 cannon mufflers which are restricting exhaust exits.
Having a new exhaust built tuned length at the moment that should be ready by the weekend and that should hopefully help it breathe a lot better and
i'm told will give it more bottom end.
Unsure of the venturi size. Anyone have suggestions on what they should be?
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Venturi selection - For engines that rev pretty high (6000-7000 rpm), you are best off choosing vents that are about 2 to 4mm smaller than your intake
valve size.
For engines that are set up for torque, like bus engines, and other torque-happy applications, you can go a little smaller on the vents and get better
low end response. For these, I'd recommend 4 to 6mm smaller than your intake valve size.
So what happens if your vents are too big? You'll have reduced air-speed at low RPMs, which makes tuning harder. Air speed is one of the things that
tells your different fuel circuits when to start to come on. It will be soggy down low.
So what happens if your vents are too small? The undersized vents will restrict your engine's ability to breathe at higher RPMs.
How critical is it? Not terribly, but if you're way off it will matter, and you will feel it. Putting 40 vents in a set of 44 IDFs with 40mm intake
valves will be pretty soggy down low. Sticking with the 36's would be about right. Putting 28 vents into a set of 40 IDFs on an engine with 40mm
intake valves will limit your top end noticeably as well. A set of 44 IDFs, for example, can me made to work on many engine sizes with the standard 36
vents, but you might find that you could optimize them better if you are willing to spend the money and try some different vents that would be ideal
for your application.
Aircooled.net reccomend 32's for a 1600 and my experience tells me that is spot on.
Same thought with 36 vents for a 1916
So "my" suggestion would be AT LEAST 36 vents, if not some thing more.
