Ronie's 660 kit saw

[Maintenance Chief]

The absolute strongest running 660 I ever built was freeporting under the piston about .030".

 

[Mastermind]

Why the quote with no reply? Seems odd….

 

[Ronie]

I saw that, If I don't cut the base and do a gasket delete it won't free port. This cylinder has a smaller combustion chamber than the Hyway so It might make good compression with just a gasket delete.

 

[Maintenance Chief]

Why the quote with no reply? Seems odd….

Me reply?
I was quoting your post as a knowledgeable person in reference to the Freeport of the p/c in the previous posts. Merely as freeporting may not be a big deal.

 

[Mastermind]

Me reply?
I was quoting your post as a knowledgeable person in reference to the Freeport of the p/c in the previous posts. Merely as freeporting may not be a big deal.

Ah. I understand then.

 

[Ronie]

I did a test fit and got the squish, .0195 with the old base gasket and no free porting.

 

[Ronie]

I tried cutting the squish band and it didn't go so well, I think when I get to the bore the whole cutter is making contact and I need to raise the cutter up some or turn it a little, it sucks but I'll get the hang of it. I ordered a new cylinder and it will be here friday.

 

[Mastermind]

I tried cutting the squish band and it didn't go so well, I think when I get to the bore the whole cutter is making contact and I need to raise the cutter up some or turn it a little, it sucks but I'll get the hang of it. I ordered a new cylinder and it will be here friday.

View attachment 305958

You can fix that I think. What shape cutters are you using?

 

[Ronie]

You can fix that I think. What shape cutters are you using?

Here's a pic of what I use.

 

[Mastermind]

This is what I use.

Also, your setup needs to be very stout, with no deflection. I use a 3/4 boring bar, and a good quick change tool post.

 

[Ronie]

You can fix that I think

I took some measurements and it looks like the high peaks will come to the middle part of the top ring with .020 squish. I'll smooth it out and give it a shot.

 

[Mastermind]

I took some measurements and it looks like the high peaks will come to the middle part of the top ring with .020 squish. I'll smooth it out and give it a shot.

Worth a try.

 

[farminkarman]

This is what I use.

Also, your setup needs to be very stout, with no deflection. I use a 3/4 boring bar, and a good quick change tool post.

View attachment 305963

Randy, what brand boring bar is that? That one looks nicer than the one we have at work.

 

[Mastermind]

Randy, what brand boring bar is that? That one looks nicer than the one we have at work.

It's a Kennametal bar.

 

[Stump Shot]

I tried cutting the squish band and it didn't go so well, I think when I get to the bore the whole cutter is making contact and I need to raise the cutter up some or turn it a little, it sucks but I'll get the hang of it. I ordered a new cylinder and it will be here friday.

View attachment 305958

Looks to me like your boring bar is a little too high or low, try centering it better in the cut.

 

[huskihl]

Here's a pic of what I use.

View attachment 305960 View attachment 305961

I have a similar bar in 5/8. I point it back towards me maybe 2 to 3° from 90 so the point hits the plating better. Can’t go much more than that or the end of the bar will be riding the squish band the whole way

 

[huskihl]

But no matter how you do it, any plated squish band absolutely sucks on a small lathe. Fortunately a 562 and 572 are about the only oem cylinders I can think of with anything measurable on the band.

 

[Mastermind]

But no matter how you do it, any plated squish band absolutely sucks on a small lathe. Fortunately a 562 and 572 are about the only oem cylinders I can think of with anything measurable on the band.

Fact !!!!

 

[BuxtonSaws]

I tried cutting the squish band and it didn't go so well, I think when I get to the bore the whole cutter is making contact and I need to raise the cutter up some or turn it a little, it sucks but I'll get the hang of it. I ordered a new cylinder and it will be here friday.

View attachment 305958

It was already mentioned.. but to me it also looks like you need shims under the bar. I run slightly above center.. I'm no machinest though. I learn from trial and error... My ways are not always correct.

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[Ronie]

Finally success, I spent the morning trying to figure out how to get my tool rest raised up high enough and after 3 times having this cylinder on and off the lath, I think I got it. This is the Farmartec cylinder that came with the kit, it looks like I made a small squish band but the second time I had it on the lathe I wasn't cutting all the way to the bore and I didn't cut it quite as deep the third time I had it on the lathe. So I raised the tool rest, shimmed the bar and set the bar at a little angle. One other thing I did was to put another dial indicator on the tool rest so I could see when I was at the bore. Thanks for the help@Mastermind, @Stump Shot, @huskihl and @BuxtonSaws. If I forgot anyone, thanks to you too.