Good but not flexible at all It does what it's supposed to do, except that you can't use decimals in some fields (like HP - I can't do any less than 1HP for a 5cc engine, so my total length comes out to 4ft). Everything is also in mm, no way to change units to in.
Expansion chambers are awesome!!.........I've owned12 2 stroke street bikes I think the funnest and most surprising bike i had was a Kawi S2 (3 cyl 2 stroke 250cc) It was a late 70's model i bought from a young guy who'd only had it 1 month and "looped it". he tried to ride a wheelie before he mastered his basic riding skills. The bike had chrome Denco pipes,clip-on's for handle bars and a good quality set of set back foot pegs.Whoever piped that bike installed a taller toothed rear sprocket and weisco short skirt pistons. When i got it i immediately installed new ignition points,
Good app if you have the need for i 2 stroke exhausts are an art form , it is good to see this app. With pollution restrictions these days it will soon be hard to even find small 2 strokes.
Need more options Its not too bad but the pipe diamensions are not what im used to for 25 - 30.5 cc motors. Would be good if you could have intake & transfere durations in the calc but also a reed option
Big. Boy assault I drive a it 490 hand built this ap0 produced a fantastic exhaust pipe for that runs great hell yea ⁴stars
Total bugus, I admire people if they are able to make this app work, however I am a builder and have calculated my 2-stroke exhaust the hard way for a long time, the only way you can calculate a real expansion chamber is by entering in the width and Stroke of your piston chamber... That's the only possible way to know the proper exhaust chamber size. Any other way and it's not right.
1.0 First version
1.1 Added landscape mode and qVGA resolutions
1.2 Added hydroformed calculations as promised
Want quick check of duct pressure drop?? Try this! Input size and get result!