Chainlube
Well-Known Member
How else yee bee havin' fun?
Porting
- Thread starter Michael80chinadoll
- Start date
Mike Cyanide
Well-Known Member
I like your ambition but 1. Porting is never the solution to a tuning problem lol 2. B4 porting buy a couple cylinders so you can switch back from an inevitable botch. 3 porting is tough. You need alot of practice with your tool to make something decent. 4. Start simple like matching your intake to the intake port. 5. Always keep your bit moving. 6 work slow constantly stopping to access your work. 7. A great way to grab some power is deck your cylinder to adjust squish. A good beginner mod 8. Chamfering any sharp edges in your exhaust pipe is a good start. 9. Trimming gaskets to port shape is more power. 10. You mix ratio can play a role in tuning 20:1 will make you leaner. 32:1 more rich. Those are some great beginners mods that are fairly low risk and will hone your skills
Great advice here. I do agree that if you want to start porting, start with port matching. The intake and exhaust ports as well as the transfer ports between the case and jug. Also, focus more on shape than simple material removal because smooth airflow with as little turbulence as possible will have increased velocity and mass/volume. I always try to visualize in my head how water would flow over or through whatever it is I am shaping. The idea of "smooth is fast" applies here.
If you want to start doing actual port re-shaping and timing adjustments, learn the process and the math. It's a little tedious at first, but once you learn how to mark out and shape the ports to get your desired timing numbers, and what different shapes of port floors, roofs, etc. can do and their potential problems, you can start to get a good feel for what will work and/or be reliable. The real trick is to always be conservative with your porting. It's incredible how much just half a millimeter too far can take an engine from awesome to paper weight.
I definitely agree with having spare cylinders. Thankfully, these engines are cheap enough that ordering a couple of replacement/practice jugs is not too hard on the budget. It also makes it possible to experiment and compare different port shapes/timing changes side by side.
Mike Cyanide
Well-Known Member
Bike jesus is that you?! In seriousness I should emphasize that if your new completely to metal working maybe just find a chunk of aluminum (I use cylinders I've already blown lol) and start grinding. Make some shapes. See how the tool reacts. Try to make a rounded peice outa a flat part and a flat peice out of a round one. If you have something close to the shape of a port focus alittle on corners and how to make them smooth. 90% of porting is becoming proficient with your tool. The other 10% is math,port shapes and finding the balance between volume and velocity! It's more fun than it sounds. I get excited about porting and really optimizing a motor... some days I like it more than the ride lol
Another brother from another mother.
Mike Cyanide
Well-Known Member
Lol good too be home my guy. It's all about the chase. It's kinda like beating a game you like as a kid victory is sweet but that empty feeling of accomplishment is the worst.
When ya get to be my age, you just want it to work and keep going with as little problems as possible...You don't wanna keep tinkering with it so much...lol...lol.
Mike Cyanide
Well-Known Member
I'm 35 and I have those days but that's what my ld100 is for lol. Everything else is a bonus. Although I only have 4 bikes right now. 1. Ld100. 2. Avenger. 3. Ld80(mostly stock). 4. 53cc 4 stroke screaming demon(I do not ride because it's really nice + for sale). Honestly I even like building motors that I have no immediate plans for. Just for the satisfaction and comfort of my extra redundant redundancy. Still have a clone for each motor and bike but now I have future fun. 1 brand new screaming demon that idk what to do with yet,1 49mm iron bore with reed top end and piston port one,1 yd100 with 2 extra top ends,1 rainy day ld80 with 2 top ends(1 boost ported 1 3rd transfers);2 alternate yd85 top ends,1 eventually home made "menace/malice" AND the pinnacle of my collection THE LD85 REVENGER!... The most ridiculous part is I. Just getting started lol I haven't even considered a minarelli yet!
