034 Super Build

[Vintage Engine Repairs]

Meticulous work and well documented with interesting subtleties in differences between similar models, well done as always Al. Ps, I see the tig torch holder, I recall you did an av pocket repair, was that in a 034s?Starting to feel more comfortable with tig welding, It finally feels like I’m getting the hang of it.

 

[Mastermind]

He doesn't know much about saws, does he?

Next to nothing.

 

[drf256]

I have to time the jug. I may actually do a popup on this one. I dont think i can improve what Kölbenschmidt did here.

 

[markds2]

Great to see this thread Dr Al, the 034S you did for me is one of my favourite saws! How have you been anyway?

 

[drf256]

Great to see this thread Dr Al, the 034S you did for me is one of my favourite saws! How have you been anyway?

I am good. Hope you are as well. They are light and pack a punch. Perfect sized saws IMHO.

No popup here. Trans @ 125 and Ex @ 106 sans gasket.

 

[SCHallenger]

Adding new bearings, seals and gaskets to this build. The ones in it were likely redone, as they were pretty good upon disassembly. With the work involved in a case split and clean, I like to swap them out to new.

PTO bearing is OEM, and the fly side is Nachi. I have actually had a few SKF 6202 bearings fail, so I try to stick with Nachi now.

The sealed Nachi’s are cheaper than the unsealed ones in general. I pulled the seals out easily with a dental tool.

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I have quite a few of my old dental instruments still "hanging around". If you have a particularly "snaky" shape that is a favorite for certain applications, let me know, & I'll check my inventory. It's likely that I have several. Some years ago when Brad Snelling was doing a lot of porting, I gave him a few, & he found them very handy.

 

[drf256]

I have quite a few of my old dental instruments still "hanging around". If you have a particularly "snaky" shape that is a favorite for certain applications, let me know, & I'll check my inventory. It's likely that I have several. Some years ago when Brad Snelling was doing a lot of porting, I gave him a few, & he found them very handy.

Stayner, hope u are well. Hope my spelling ok.

 

[jacktheripper]

Love my MOFO 034 Super! What a gnarly beast. Hangs right with a stock 044 with a 20" bar.

 

[markds2]

I am good. Hope you are as well. They are light ans pack a punch. Perfect sized saws IMHO.

No popup here. Trans @ 125 and Ex @ 106 sans gasket.

We're all good and well thanks Dr Al, did some cutting on Saturday. used a slightly bigger saw tho. Thats a 42 inch bar.

 

[drf256]

Had a bad oem PTO bearing. 2nd one ever. Swapped it out. Used my Matty-o case assembly tool to pull it all together and centered the crank with a punch to relieve side loading.

I actually install my bolts midway through the assembly to keep the gasket perfectly lines up. I never felt like pulling it over the pins was great for the case. I punch them back in after tightening the case bolts, only after using the case tool to pull it all together. Leaving the pins in would negate the attributes of the case tool, that is, putting no side loading on the bearings.

I used Dirko on the case gasket. Cheap insurance.

 

[drf256]

I was gonna attempt a popup, but the jug geometry isn’t there. It will get massaged as lightly as possible. The prior owner sanded the ridge out of the squish band, so I’ve got some times and gazinta’s ahead of me here.

The ports are a perfect example of what one wants IMHO. I even think K$ cut it as close as possible with the exhaust roof arc.

 

[drf256]

I started using the digital degree finder that @Red97 sells. Makes it easier, as my builder case can sit on my bench flat. Takes me a bit to get it zero’d out.

 

[drf256]

There’s nothing like having a builder case for the model I am doing. No need to clean the jug of swarf every time one grinds. Has the perfect needed geometry. Never have to worry about getting shít in the case of the actual saw one’s building.

The Beltsander Bandit told me it’s impossible to not get grindings in a saw you’re porting. I have always disagreed with that statement.

 

[Onan18]

There’s nothing like having a builder case for the model I am doing. No need to clean the jug of swarf every time one grinds. Has the perfect needed geometry. Never have to worry about getting shít in the case of the actual saw one’s building.

The Beltsander Bandit told me it’s impossible to not get grindings in a saw you’re porting. I have always disagreed with that statement.

I haven't thought of him for a while, good times...



NOT!!!!

 

[Vintage Engine Repairs]

I started using the digital degree finder that @Red97 sells. Makes it easier, as my builder case can sit on my bench flat. Takes me a bit to get it zero’d out.

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Remind me al, that model of angle finder, does it go a full 360 or reset to 180 each time?

 

[Mad Professor]

Have not visited OPE in a while. Merry Christmas and Happy New Year everybody.

Nice work an great pictures.

I'll be watching/bookmark this as I have two 036 I run.

 

[Woodwackr]

I was gonna attempt a popup, but the jug geometry isn’t there. It will get massaged as lightly as possible. The prior owner sanded the ridge out of the squish band, so I’ve got some times and gazinta’s ahead of me here.

The ports are a perfect example of what one wants IMHO. I even think K$ cut it as close as possible with the exhaust roof arc.

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Do you smooth out the casting boogers in the transfers or leave things as pictured?

 

[drf256]

Do you smooth out the casting boogers in the transfers or leave things as pictured?

I generally don’t. I do clean up the corners of the tunnels tough.

There have been a lot of theories on flow over different textures. One theory is that rough textures hold onto air and that the flowing air will glide quicker over the trapped air than a smooth surface. Atomization of the air/fuel mix is another theoretical attribute of a rougher surface in the intake tract of and engine.

I believe Timberwolf on AS showed that a rough exhaust port actually flowed more air than a smooth one. Over time, the rougher surface did tend to trap more carbon and flow less though.

@Mastermind , do you recall his experiments on this? It was a year or two prior to me joining AS. He did a lot of experimentation, including muffler exit area vs. exhaust port area in terms of flow and decibels IIRC.

 

[Mastermind]

I generally don’t. I do clean up the corners of the tunnels tough.

There have been a lot of theories on flow over different textures. One theory is that rough textures hold onto air and that the flowing air will glide quicker over the trapped air than a smooth surface. Atomization of the air/fuel mix is another theoretical attribute of a rougher surface in the intake tract of and engine.

I believe Timberwolf on AS showed that a rough exhaust port actually flowed more air than a smooth one. Over time, the rougher surface did tend to trap more carbon and flow less though.

@Mastermind , do you recall his experiments on this? It was a year or two prior to me joining AS. He did a lot of experimentation, including muffler exit area vs. exhaust port area in terms of flow and decibels IIRC.

Yes sir. That dude tested everything. There was even a lot of discussion about how a layer of carbon in the exhaust port helped to stop heat from soaking into the jug.

 

[Mad Professor]

I generally don’t. I do clean up the corners of the tunnels tough.

There have been a lot of theories on flow over different textures. One theory is that rough textures hold onto air and that the flowing air will glide quicker over the trapped air than a smooth surface. Atomization of the air/fuel mix is another theoretical attribute of a rougher surface in the intake tract of and engine.

I believe Timberwolf on AS showed that a rough exhaust port actually flowed more air than a smooth one. Over time, the rougher surface did tend to trap more carbon and flow less though.

@Mastermind , do you recall his experiments on this? It was a year or two prior to me joining AS. He did a lot of experimentation, including muffler exit area vs. exhaust port area in terms of flow and decibels IIRC.

This is a great thread! Never knew about the differences in the 034 vs 036 cranks. Want to see what you do with the ports and muffler.....

Those transfers are much rougher than the 036 cylinders I've worked on. I've got an 036 spare that is not on a saw, I'll check that.

This is one I cleaned up that was straight gassed. Piston was ugly.



Don't have better pic of transfer ports, this after aluminum transfer removed.



On ex ports I'm a fan of polishing them.

Before polish, don't have one of muff side



After polish