a note to be careful in porting

crassius

Well-Known Member
Joined
Jul 23, 2012
Messages
4,580
Likes
694
#1
2nd customer this month bought new cylinder due to fouled up porting job - if you do it, do it carefully
 


Frankenstein

Well-Known Member
Joined
Jun 24, 2016
Messages
5,061
Likes
816
#3
Practice on some scrap aluminum, those carbide bits like to hop around sometimes, and they cut really well, so before you know it you can cut too much and ruin the cylinder. A friend of mine got a little excessive in clearing down the transfer ports, the wall was too thin and failed, of course the rings went with it and the rest of the motor with that situation.

As in that.
 
Joined
Apr 6, 2017
Messages
59
Likes
6
#4
Practice on some scrap aluminum, those carbide bits like to hop around sometimes, and they cut really well, so before you know it you can cut too much and ruin the cylinder. A friend of mine got a little excessive in clearing down the transfer ports, the wall was too thin and failed, of course the rings went with it and the rest of the motor with that situation.

As in that.
Sometimes hand tools give you time to think about what ur doing whereas power tools just grind away (something 30 years of carpentry learned me) measure twice think 5 times cut 1 time
 

butre

Well-Known Member
Joined
Dec 2, 2013
Messages
2,499
Likes
392
#6
show some boffed porting examples :D:LOL:
bad porting isn't necessarily ugly, sometimes it's just that some bonehead didn't do any math. you go too far in one direction, not far enough in another, mess up an angle somewhere else, and end up making less power than stock.
 

JerboaJohn

Active Member
Joined
Jul 29, 2018
Messages
240
Likes
51
#7
ohh so you might not know you messed up until it's all together and test it out.

question tho where should I attach a degree wheel so I know what the port timing is before changing anything? I think I can find a printout-able wheel and make a pointer. i can sacrifice the stock jug if I bungle it, I have a new one for backup
 

Top