daveberari
Well-Known Member
- Joined
- Jun 22, 2017
- Messages
- 45
What is the “rule of thumb“ for the boost/transfer to be upped relative to increase of exhaust?
Ok yes let’s talk blowdown numbers. Is there a NUMBER that is you should be working forexhaust timing(example:190°) .-transfer timing(example:130°)=60°/2=30°, which is the blow down for this particular engine. boost may or may not be the same. goolgle, 2 stroke blow down
check your pmsOk yes let’s talk blowdown numbers. Is there a NUMBER that is you should be working for
Will that number change for say RPM
Torque
Overall hp-performance
Just trying to get the best performance aside from other things
Thanks but will this apply to nitro engActually, measuring ports in terms of timing only is too simplified. You need to think in terms of time areas. This goes for blow down as well. See Propwash October 2015.pub for an explanation of all this as applied to a Zenoah 260.
Lohring Miller
This is for nitro engines right not gasI shoot for about 33deg of Blow Down.
Well squeezing the trigger from start to finish , I do drive like that sometimesthe higher you get with the blowdown, the less "friendly" your motor becomes. less torque coming off the corner,etc. if you squeeze the trigger,and never let go, it can work, but some people don't do that, and it may not work for them.
Not trying for perfect porting -just wanting to understand relationship for optimizing performance along with the many other considerationsA two stroke is a two stroke, no matter what the fuel. The same concepts apply. I'm in the process of writing a series of articles on nitro engine design. The biggest differences besides the fuel is size. Most gas engines are larger and friction isn't as big a part in power as it is in nitro engines. I believe piston to liner fit , head button volume and shape, and mechanical design is more important than perfect porting. Most modern engines have reasonably good porting. Power will mostly be found in pipes and head buttons.
Lohring Miller
Rossi 21/brand new 1999 picco45/ new 1999 67 picco and cmb 67What motor(s) RU running?
What motor(s) RU running?
Just getting back into racing after 19 yrs /was doin good when I got out but you guys are going a lot faster and so would I and I need to understand moreWhat motor(s) RU running?
Better props!Just getting back into racing after 19 yrs /was doin good when I got out but you guys are going a lot faster and so would I and I need to understand more
Better props!
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