Pro Mac 850 project

[RandyMac]

Promac soup. Number 850. With fried rice.

and a side of thighs.

 

[dieselsmoke]

610 Looks good so far.... Have you guys ever used H2O on a running engine to scour the carbon out. Old drag racer told me they would pour small amounts of water into their race motors at half throttle or so to purge out the carbon. I know it works having changed out head gaskets that failed. the cyl that ate water is CLEAN. like you could eat off of it.

 

[promac850]

:msp_lol: You guys crack me up! Promac soup... I'm gonna have to open up a tavern that has a bunch of specialty soups on the menu.

I was out in the barn polishing the fins up. She'll be quite shiny when she goes back together. Not done polishing yet... so pics will have to wait.

 

[promac850]

610 Looks good so far.... Have you guys ever used H2O on a running engine to scour the carbon out. Old drag racer told me they would pour small amounts of water into their race motors at half throttle or so to purge out the carbon. I know it works having changed out head gaskets that failed. the cyl that ate water is CLEAN. like you could eat off of it.

Cool tip, must be used with caution, though. Just a little too much water and the engine can hydrolock. Not cheap, bent rods, cracked pistons, cylinder heads, and block can occur.

 

[rwoods]

Cool tip, must be used with caution, though. Just a little too much water and the engine can hydrolock. Not cheap, bent rods, cracked pistons, cylinder heads, and block can occur.

Are you sure you're only 18? Or do you just read a lot? :msp_unsure: Ron

 

[heimannm]

Continue working PM610, you are doing a good great job. Looks like the boiling technique works pretty well.

Be careful what you say though, I have an 066 and I fear even a PM850 in tip top shape will have trouble keeping up with it.


Mark

 

[promac850]

Are you sure you're only 18? Or do you just read a lot? :msp_unsure: Ron

Yep... I'm 18, just read a lot. Car&Driver, Road&Track, a dirt bike or snowmobile mag every once in a while.

The internet, tv, and videogames are actually the biggest source of knowledge for me. No bs. I learned how turbos work for making a car faster, compression ratios, etc. from HowStuffWorks - Learn How Everything Works! and some other sites.

I did learn a lot in school too, I had two sessions a day at the tech center near me in high school for senior year, and one a day junior year. Took all of the auto classes they offered there except parts and service. I know how to do that already... my parents are accountants. Almost done with college too. One year to get an Associate's in automotive. I think I only have about six grand in student loans to pay off. Might be less.

Still pissing away lots of money on tools, gonna need them, especially if I get a job. Parents bought me a used big Snap-On toolbox for 600 bucks, and I bought some tools from the guy that was selling the box. He's also keeping tabs on his connections in the diesel repair field, and will let me know if there is a job opening somewhere. Nice guy. He said he was one of those guys that was under the truck, and would come out covered in grease and dirt.

My brother is pissed, he's been in college for four or five years now and has a huge student loan that he'll have to pay off. (I dunno how much, probably at least eight times as much as I owe) He's doing chemistry.<---Going for a Master's. He loves calculus too. My brain starts hurting when he babbles about that ####.

 

[promac850]

Continue working PM610, you are doing a good great job. Looks like the boiling technique works pretty well.

Be careful what you say though, I have an 066 and I fear even a PM850 in tip top shape will have trouble keeping up with it.


Mark

Even my ported 850? How many cc's is an 066? I don't know a whole lot about Stihls. I do know they are good saws.

 

[homelitejim]

the 066 is 91.6 cc

 

[promac850]

the 066 is 91.6 cc

Oh. I thought it was 60cc. Like I thought the 088 was 80cc. I am not very keen on Stihl cc's and names, for sure. Why do they have such a weird numbering system? I like how McCulloch does 605 (60.5cc) 610 (61cc) and 800 (80cc) Hmm... guess I got to read more about Stihls.

 

[homelitejim]

Just remember that Stihls numbering system has nothing to do with the size of the engine, but more with older model lineage for example, 066-ms660, 064-ms650, 036-ms362, and so on.

 

[cat-face timber]

I really like the idea of boiling parts, but what do you put in the water?
Simple Green? or just plain tap water? or do you use ?????


Thanks for the info.

 

[promac850]

I really like the idea of boiling parts, but what do you put in the water?
Simple Green? or just plain tap water? or do you use ?????


Thanks for the info.

Plain tap water, forgot to put the Permatex Fast Orange in. :bang: Still worked good though, but with a very small amount of some kind of water based hand cleaner probably would help. I think too much hand cleaner or whatever you put in there may be not only too strong, possibly enough to damage something; also might slow down the process if it happens to increase the boiling point of the water.

BTW, I used hot tap water. It boils a lot sooner, and it doesn't hurt the cylinder to put it in there. Also, set the cylinder in with the bottom (area where it seals to crankcase) facing up so you are looking right at it. Don't forget to move the cylinder around, it will clean up a little better if it gets laid on its side, and stood up with the spark plug hole facing you. I boiled my cylinder twice, and it worked very well, and got almost all of the grease and carbon that the parts washer couldn't take care of.

 

[cat-face timber]

Thanks for the info, I will have to try that.

 

[heimannm]

Careful again PM610; the 600 Series McCulloch saws are (for the most part) 3.7 In³ or 60.5 cc. While a lot of guys will tell you the 650 and 655 are much better running saws, the IPL's I have show all share the same piston and cylinder.

There are a few odd ball 3.4 In³ 57 cc tossed in there like the PM5700.

Son Jeff and I have the 605, 610, 650, Timber Bear, Eager Beaver, Montgomery Wards, and PM5700 so far. Stiil looking for the 645, 655, and Silver Eagle 3.7.

Mark

 

[promac850]

Careful again PM610; the 600 Series McCulloch saws are (for the most part) 3.7 In³ or 60.5 cc. While a lot of guys will tell you the 650 and 655 are much better running saws, the IPL's I have show all share the same piston and cylinder.

There are a few odd ball 3.4 In³ 57 cc tossed in there like the PM5700.

Son Jeff and I have the 605, 610, 650, Timber Bear, Eager Beaver, Montgomery Wards, and PM5700 so far. Stiil looking for the 645, 655, and Silver Eagle 3.7.

Mark

I think I saw a Silver Eagle 3.7 on CL locally. Will check and let you know if it's there.

Wow, I'd better study up more on saws. Well, I will stop bothering with the cc stuff until I get most, if not all of it.

BTW, I am not trying to put anyone's saws down, just making assumptions, which makes an ass out of me and not any of you guys.

edit: It is a Silver Eagle 2.0, not 3.7

also saw a Pro Mac 55 for 50 bucks, guy says he can't get it running, even after he rebuilt the carb. has good spark. Should I get it?

There is also one of these, the guy said he replaced the fuel lines and it runs good. Suspect you will say 40 bucks is too much.

Yes, I got bitten buy the CAD bug. I am in critical condition. Must feed the bug... :hypnotized:

 

[heimannm]

The SE3.7 seems to be a bit less common than the smaller displacement SE saws.

The PM55 is a nice saw, but unusual displacement, one of only a few saws with the 1.812 bore. In the same group are the PM555 and (I think) the PM570 but I haven't been able to find much information on the PM570. I do have one on the way, maybe next week it will arrive and I can look into bore & stroke.

The Mini Macs don't get much love here, but I am a yellow and black sort of guy so I am looking to get a good representation of the early line up. I have a nice MM6 that needs seals, parts are on hand but time is limited. I also have a MM1 on the was from KY, looking forward to that one.

Mark

 

[rwoods]

The PM55 is a nice saw, but unusual displacement, one of only a few saws with the 1.812 bore. In the same group are the PM555 and (I think) the PM570 but I haven't been able to find much information on the PM570. I do have one on the way, maybe next week it will arrive and I can look into bore & stroke.

Mark

Mark, I just boxed a PM570 I sold yesterday. I believe it has the same bore as the PM 10-10S = 1.812". BTW selling saws is no fun! Ron

 

[heimannm]

I always forget about the PM10-10s, guess there is always one more to try and add to stable.

Seems there have been a few PM570's on e-bay lately, some go high and some go low.

There have been a bunch of PM 10-10s saws as well but they all seem to be up over $100. The PM 10-10s at 1.812" bore / 57 cc displacement is not the same thing as the 10-10 Super or Super 10-10 which are still 54 cc with the standard 1.750" bore.

Mark

 

[promac850]

Mark, I just boxed a PM570 I sold yesterday. I believe it has the same bore as the PM 10-10S = 1.812". BTW selling saws is no fun! Ron

Why are you selling your saws? No more room for them?