6401 woods port build

[nmurph]

well, i cut the band because it needed to be cut.

ok, straighten out the circular arguement please: why did the squish band need cutting? is a flatter combustion chamber preferrable to the factory shape?

 

[parrisw]

ok, straighten out the circular arguement please: why did the squish band need cutting? is a flatter combustion chamber preferrable to the factory shape?

The only reason I can think of is to make the chamber smaller, then drop the jug to get the right squish, will give you higher comp.

 

[tdi-rick]

ok, straighten out the circular arguement please: why did the squish band need cutting? is a flatter combustion chamber preferrable to the factory shape?

Sometimes the squish band isn't even/flat, you can get a lip or two from where the hone bumped the band and the rest of it is as cast so taking a lick off it evens things up.
You do have to be careful if going for a cc reduction in the chamber as the plating sometimes doesn't go all the way to the top of the cylinder, so you may not be able to go too deep on the cut.

 

[tree monkey]

put it together just to see what it gained so far.

gained a little.
i want to raise the ex port, but can't untill i get the piston welded up.
made a piston collect.

changed the transfers a little.

scott

 

[parrisw]

Looks good. The piston collet is a good idea.

 

[tree monkey]

this may interest you
http://www.porting-programs.com./

 

[parrisw]

this may interest you
http://www.porting-programs.com./

That's way cool. Do you use it? how does it work? If so, did you buy both programs?

 

[tree monkey]

http://www.soft-engine.org/pagine.web/inglese/pagina_software.htm

 

[tree monkey]

the second one has a free trial that you can play with. it will teach you alot about what changes to a port does to the engine.

scott

 

[parrisw]

Thanks.

 

[tdi-rick]

this may interest you
http://www.porting-programs.com./

Wow, that's less than 1/10th the cost of MOTA. :jawdrop:

 

[Thorcw]

this may interest you
http://www.porting-programs.com./

This one peakes my interest

 

[tree monkey]

pic of the finished piston

muffler

new problem

 

[HEAVY FUEL]

I think the saw owner should have used the original clamp instead of trying to nail the boot to the cylinder.:hmm3grin2orange:

 

[blsnelling]

pic of the finished piston

THAT is a serious popup!

 

[tree monkey]

220lbs a tad too high

 

[Thorcw]

I can definatly see the torque in the last cut there when you leaned on it

 

[tree monkey]

ok i think this thing is done.

 

[tree monkey]

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[tree monkey]

same piece of wood as before. i think we were at 7 seconds, now 4 seconds.
port timing stock
in 145 dur
ex 148
tr 98
sq 26
port timing now
in 156
ex 158
tr 116
sq 21
saw runs strong
enjoy

scott