For an engineering project for school, I am designing an airbox for my Superjet. I need to know the vacuum created by the engine to analyze my design. I realize it changes as rpms increase and on engine/set-up. If anyone has measured the vacuum pressure of the intake it would be greatly appreciated if you could post your results and set up. I'm not limiting myself to just Superjet motors as this is an odd question so any 2 stroke jetski engine will do. Thank you in advance for any help.
Carb vacuum?
- Thread starter tpars
- Start date
DAG
Yes, my balls tickled from that landing
- Location
- Charlotte, NC
Lots of factors as always your best best is to stay away from the x and pick up the phone and call a carb or engine builder. Tim at Novi or Ed at Full Spec. I also believe Zack at PFP has done extensive testing when developing his manifold. Erik at TPE is also very knowledgeable on the subject and we all know he just gives his info away to anyone 
- Location
- New York
I would be interested to see what you come up with. Right now running my TPE 964 with 46 full specs and the stock air box. The back carb gets starved of air. I am working on adding another elbow to the other end of the box to let more air in. But it would be cool to 3D print something to fix this problem.
Big Kahuna
Administrator
- Location
- Tuscaloosa, AL
What airbox you running?
- Location
- New York
I am running the freeridez inc adapter plate that lets your run the large stock air box.
I don't think you'll get much of any use with a vacuum gauge, there will be pulses in there at the frequency of the motor running. 6000rpm is 100Hz. You'd need Data aquisition capable of logging at about ten times that, which isn't particularly fast. An automotive map sensor and an oscilloscope would do it. Carb manufacturers probably would be able to give you some info, if you get ahold of the right people they're usually happy to help students.