Epoxy in the intake? Ms660

Hey fellas,
Keeping seeing in the 660 build threads guys saying they have epoxied the intake. I looked through cant really find any good pictures of this and or why its being done? Can you guys post some pictures and explain why you are doing it? Thanks!

 

MS660's are known to have too much exhaust duration. They seem to run better with the exhaust opening down around 100° after tdc. Stock, they vary from about 93 to 98°. In order to get the exhaust port physically lower, the base gets cut on a lathe. This also makes the intake lower. Sometimes too low for good performance. Many consider an 80° intake opening to be about right, but most of the Farmertec cylinders have the intake down around 86. After machining, they get close to 89°, which isn't optimal. Filling the bottom of the intake port with epoxy allows you to grind it down to a more preferred opening height

 

Awesome thanks!

 

Awesome! Pictures are worth a thousand words. Thats the visual I had in mind with huskihl description. Now with pictures I am on board 100%.

 

Port prep is big, definitely wash and degrease cylinder. I like to grind in a few dimples on the floor. Then bead blast

 

Thanks for the pics Deetsy!
What epoxy do you use ?
Thanks

 

Regular old jb weld

 

Cool, thanks ! I heard some guys were using aluminum reinforced stuff.
Doing a couple 660's now and they will need it. Pushing 85* before cutting base.

 

Yeah there's fancy stuff out there if you want to pay for it. I've never had jb fail in an intake if the surface is clean with a burr finish. If it did fail, it turns to a soft powder and I don't believe it would cause damage

 

Devcon works great. But the cost is outrageous compared to a small JB weld tubes from Lowe’s.

 

It's worth the extra effort. This was for a tree service and would have a 36" bar dedicated to it. @Deets066 had a thread on Another Site if I remember correctly. This saw is a beast

 

Surface prep (rough with a couple of dimples) and JB. This brought the intake up to 80-81

 

Thanks for great info guys. I've been out of the saw game for a bit and never did a full port job on a 660, I usually just did the basics DP Muff, Ign advance, pull limiters.