Let's Build A 660!

Mounted up.. let the shenanigans begin.
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Machine work done .040 out of the band netted us 98 125 82 ... I typically like these at 100 but we are going to fly with it. On to grinding. I definitely do not want to move the intake or exhaust. But we will widen and raise the uppers.
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Buxton_Work_Saws said:
I have a few personal saws like that. Everytime I think I have time... something comes up.

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Yes this one is a personal saw also. Started the project about 4 months ago. But summer is very busy time for me. Probably won’t have it finished till fall. No hurry tho got a 066 in my fleet already
 
Buxton_Work_Saws said:
I wouldn't say that.. but with the lower exhaust it will hold better rpm pulling a long bar. Will also handle a 8 pin better on shorter bars.

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Over here if you want a stronger, or faster, or deeper saw- you just go buy a bigger one.
I can't compare numbers or anything- I'm not a porters butt hole- never done one, never claim to know how to. 😁

What I do know though from using them, is the early 066 was a stronger stock saw than the 660, top bottom and in the middle.
 
Bob Hedgecutter said:
Over here if you want a stronger, or faster, or deeper saw- you just go buy a bigger one.
I can't compare numbers or anything- I'm not a porters butt hole- never done one, never claim to know how to.

What I do know though from using them, is the early 066 was a stronger stock saw than the 660, top bottom and in the middle.
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You had the right idea... Some of the older cylinders did have better timing.

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The 064 and 066 had nice cylinders that made excellent torque when modded. The 660 suffers from a low BMEP right from the factory. Fortunately with some flow-porting / tricks and piston mods they can be made to run well. Here’s a climber I hired that wanted to try it out on a big silver-maple. Sounds like an old Mac but she throws the chips. Stock squish and NO machine work ....
 
I’ve always been a sucker for a good 660 build. Nice work! Any plans for ignition advance?
 
No plans for ignition advance on the 660 though she is running pretty Rich in that video. For a guy who is into racing saws and looking for the final 1-2% ignition timing may be critical for victory whether advanced or retarded .... For a good running worksaw advancing the timing will give more torque at the expense of overall power. I attempt to build em with plenty of Torque so I’m good there! ..... I’m in Ny at 600ft/sea level so the air is relatively dense, same guy/saw fuel etc cutting in Oregon at 3500ft could benefit from from a few degrees advance as the air is thinner. The only way to know for sure is to p/u a few xtra keys and start playing around with it. Really don’t think it’s the be all/end all that some make it out to be imho
 
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Here’s the same 660 with a tuned pipe running pig rich at 12,500 ...
... Again , flow-ported, piston mods and some flow tricks. Again , No machine work (squish band cut, base cut or “decking” the cylinder and stock squish with stock base gasket . Not a dedicated race saw by any means. I can remove the pipe , put on the muffler , retune and go cut wood and vice-versa.
 
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