What is the rpm for peak performance with a bi-turbo exhaust on a 50 cc Puch Maxi?
What is the rpm for peak performance with a bi-turbo exhaust on a 50 cc Puch Maxi?
Hahaha. That is a new one! Anyone? Anyone?
I don't know,Ken,but my 60 cc kit on Franco-Morini says 4.2 HP at I think 5500 rpm or so.It is rated for 8000,but I'd never rev a standard engine that high.Gives me 45mph pulling 275 lbs. cargo or so.Don't over-rev an old engine.It ain't worth the rebuild or replacement.You also got a stock clutch to worry about.(:^)
Emailed Moped Warehouse with this querstion. The response was 6000 RPM. I am trying to find the best combination of sprockets for my situation. That is, top speed for level roads and starting pickup is not important. There are absolutely no hills where I live (Hilton Head, SC). I have gone through all the combinations I can make with 14 and 18 tooth front sprockets and 40 and 45 tooth rear sprockets. I find that 18 front and 45 rear gives the best performance for my needs. I can always get 34 mph and have top of a 37.2 mph. I have a digital speedometer. My next improvement try will be on the carburetor. I bored the 12 mm out to 12.5mm using a round rasp. Who knows what I will do next?
If you are interested in measuring the RPMs you can get a tinytach (tinytach.com). Lots of people use these on scooters.
I would think that peak revs is higher than 6000.
TT226NR-2C
Standard Model, used on engines with one spark firing on each revolution of the crankshaft.
1 cylinder 2 stroke(reads 1x/revolution) Honda engines
4 stroke with electronic ignition and nopoints
2C can also be used with a 2 cylinder engine
Go-Karts generally use 2C
Note: Engines frequently referred to as a "4 stroke" may not be a true 4-stroke because they fire on the exhaust stroke as well---requiring a 2C.
$36.95
I got a 15mm carb for my Maxi, and it gave me a huge power increase. Ike, who is a moped army, honorary member, and frequents this site, has them for sale. You will need a bigger manifold too, but you probably know that already. I wasn't making fun, with the Hahaha in my first post...that was just a super techincal question that we don't get a lot. Swarm and Destroy! Peace.
Chris
I feel a tach is unnecessary. A simple calculation converts MPH to RPM. The clutch is not slipping when you are rolling along. The crankshaft turns 5 times for one drive sprocket rotation. Using the ratio of the drive sprocket (18 teeth) to the wheel sprocket (45 teeth) and a wheel roll out circumference of 69", the RPM at 31.4 MPH is 6000. I can get up to 37.2 with a bi-turbo, a 14 mm manifold and a 12.5 mm carburetor. The biturbo is tuned for a peak power at 6000 RPM, but works well over a wider range.
Does the biturbo help for acceleration?
It seems to help with acceleration (power) when you get around the tuned frequency from 5500 to 6500 RPM. That would be around 24 MPH for a Puch Maxi with standard (14 front and 45 rear) sprockets.
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