In my experience with street racing the cfm flow of your carbs can greatly affect performance both good and bad. For instance on a 350ci motor a holly 650 will out perform a 750 in all but the most highly built 1/4 mule race engines. Because a 350ci motor can't flow that many cfm unless it is spinning above 8k rpm. So on a door slammer going with the smaller carb will give much better throttle response. So my advice is to do the math. Figure out how many cfm your motor can flow at the desired rpm then figure out what mm carb is appropriate. Too small of a carb and you will restrict top end flow and loose top speed. Also there can be a lot gained on those type of setups by playing with the pullies and weights for the CV setup. I like the leaf blower idea personally. Positive pressure negates consernes about carb sizes. Just be sure to jet for it and retard the ignition timing.
Allen Thomas On Jan 2, 2015 7:07 PM, "paul annen" <[email protected]> wrote: > Ok, question to all of my engineer friends. > > So, I want to increase the performance of my 99 Aprilia sr50. Factory it > comes with a 7mm carb, you can go up to 19mm before an exaust mod is > needed. Aftermarket carbs are expencive, but factory ones are cheap.... my > question is this, is there any issues with putting 2 (or 3) factory carbs > on a manifold setup (yes, I would have some fabrication work to get the > linkage to work right) for this 50cc single cylinder engine? > > Later possible upgrades include > more carbs (it will handle up to 27mm) > Performance exaust > Electric turbo (12v leaf blower puts out 10 times the volume I need, but > only would give about 8 pounds of boost) > > Thoughts? Questions? Concerns? > > Thanks guys > The yeti > > -- > You received this message because you are subscribed to the Google Groups > "Nighthawk Motorcycle Lovers!" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/nighthawk_lovers. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/nighthawk_lovers. For more options, visit https://groups.google.com/d/optout.
