Fletch
Member
I see... Thanks for the explanation of primary compression. I actually think you do a great job of getting your point across.
Would there be any problem with taking a used piston from another engine I have and using it in this one to see what the difference is without the skirt trimmed?
I realize I was basically gambling with the random way I did the ports. That was a one time deal.
I read some threads where that book was mentioned as well. I basically saw that measurements were in fractions of millimeters, and I knew I didn't have the tools or machinery necessary in order to do it accurately. I had already randomly enlarged the exhaust port when I put the expansion chamber on. That was before I read/knew anything about it effecting timing- just a "why not?" move out of ignorance at the time. Then I read about the intake lowering or trimming the piston. I trimmed the piston and didn't intend to lower the intake port, but I just got carried away with the dremmel when I was trying to smooth the flash casting. I didn't have the right tool on the dremmel so it ended up removing too much. Then I just said what the ****!
I forget who, but someone mentioned 1.1" as the magic number for the exhaust port from the top of the head? Is this generally agreed upon? I ask because I'm thinking that on this new engine I have, I will just trim the skirt and leave the exhaust alone if it is about 1". It's going on a new bike with shift kit, and I definitely don't want to mess it up. Would there be any risk in that?
Would there be any problem with taking a used piston from another engine I have and using it in this one to see what the difference is without the skirt trimmed?
I realize I was basically gambling with the random way I did the ports. That was a one time deal.
I read some threads where that book was mentioned as well. I basically saw that measurements were in fractions of millimeters, and I knew I didn't have the tools or machinery necessary in order to do it accurately. I had already randomly enlarged the exhaust port when I put the expansion chamber on. That was before I read/knew anything about it effecting timing- just a "why not?" move out of ignorance at the time. Then I read about the intake lowering or trimming the piston. I trimmed the piston and didn't intend to lower the intake port, but I just got carried away with the dremmel when I was trying to smooth the flash casting. I didn't have the right tool on the dremmel so it ended up removing too much. Then I just said what the ****!
I forget who, but someone mentioned 1.1" as the magic number for the exhaust port from the top of the head? Is this generally agreed upon? I ask because I'm thinking that on this new engine I have, I will just trim the skirt and leave the exhaust alone if it is about 1". It's going on a new bike with shift kit, and I definitely don't want to mess it up. Would there be any risk in that?