Marty Davis
Well-Known Member
- Joined
- Sep 25, 2004
- Messages
- 2,445
Loring:Thanks. I tried to post a picture, but was it was too big (?) The picture along with a lot more on our CMB 35 testing and modification program is at http://www.modelgasboats.com/magazine/tech-articles-mainmenu-608/244-cmb-35-record-engine Our fooling with transfer port angles showed flat top transfers worked best. That shouldn't be the case in a well developed engine.
The modern 5 transfer engines use a large up angle on the A (closest to the exhaust) ports with a flatter angle and a horizontal hook on the B ports. The C (boost) ports have a large up angle. None of this information was helpful with the cruder style passages on a 3 transfer port engine. However, I think the angle cuts at the front edge of the side transfers did somewhat the same thing as the large up angle on the A ports. I would post pictures that show all this better, but I seem to be restricted to tiny picture posts.
Lohring Miller
Please describe the reasoning for the horizontal slit below the exhaust port if you will....