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Antique Steel Wheel Tractors - Old Iron Lugs and Cleats Photos and information about antique steel wheeled farm tractors. This is where to find the heaviest of Old Iron tractors.

Antique Steel Wheel Tractors - Old Iron Lugs and Cleats

Gas Traction Big 4 from Blomgren Estate


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  #601  
Old 12-07-2012, 12:58:26 PM
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OTTO-Sawyer OTTO-Sawyer is offline
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Default Re: Gas Traction Big 4 from Blomgren Estate

Looks like a good place to ask a question of thought of when I saw the video the other day....

How close to the head did you bore it, and did you blend it in or leave a step ?

I don't know how big of a chamber remains when the piston is at top dead center, but I'm guessing being fairly low compression there's a lot of room in there.

---------- Post added at 12:58 PM ---------- Previous post was at 12:54 PM ----------

Also.... did you undercut the bore a few thousandths on the head end for hone clearance, or are you running the hone right up against the shoulder at the end of the bore ?
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  #602  
Old 12-09-2012, 03:08:02 PM
Allan Severson Allan Severson is offline
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Default Re: Gas Traction Big 4 from Blomgren Estate

We bored the cylinder fifteen inches deep. The piston travel will use 14 1/2 inches of this bore, which leaves 1/2 inch between the top of the bore and the top of the piston. The top ring is 3/8 inch from the top of the piston, so we actually have 7/8 inch of unused bore. There is a small shoulder at the top of the bore.

We originally planned on oversizing the top 1/2 inch of the bore, but were concerned that if the piston was pushed up too high during assembly, the top ring would expand into this oversize area and the piston would be locked there. So we decided to hone it as close to the top as we could and that should be good enough.

The chamber combined with the area around the valves is large enough to make this a very low compression engine. We will go into that area and radius off any sharp corners to eliminate potential hot spots.
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  #603  
Old 12-09-2012, 07:11:12 PM
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Tanner Remillard Tanner Remillard is offline
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Default Re: Gas Traction Big 4 from Blomgren Estate

Its not a very good picture, but here im boring out a vertical pump suction bowl on a 1929 Bullard VTL that we have in the back corner of the machine shop at work. Its kind of a fun machine to run. Its one of those machines that doesn't get used much, but sometimes its the only machine you can use to do a job. It looks like its really turning some RPM's but its only going 77, its top speed. I like seeing your fixtures Allan, it's always good to store other machinists ideas in the back of my brain, never know when I might use it.
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Old 12-10-2012, 02:23:36 AM
1031d 1031d is offline
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Default Re: Gas Traction Big 4 from Blomgren Estate

I used to run a pair or GREY VTL's with 4' chucks, they were fun to operate! Ours had full enclosures though.
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Old 12-11-2012, 10:01:40 AM
Allan Severson Allan Severson is offline
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Default Re: Gas Traction Big 4 from Blomgren Estate

We have finished the next operation, which is boring the cylinders for the Big 4 tractor.
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Old 12-11-2012, 02:20:14 PM
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Default Re: Gas Traction Big 4 from Blomgren Estate

I'm guessing there's more than a few pounds of Iron chips and shavings in the scrap tub. Did you weigh it up when you were done ?
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Old 12-11-2012, 03:46:00 PM
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Default Re: Gas Traction Big 4 from Blomgren Estate

Just like going to the beer store and getting a 24....of Big 4 30 cylinders!!!!
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  #608  
Old 12-12-2012, 10:12:07 AM
Allan Severson Allan Severson is offline
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Default Re: Gas Traction Big 4 from Blomgren Estate

Quote:
Originally Posted by OTTO-Sawyer View Post
I'm guessing there's more than a few pounds of Iron chips and shavings in the scrap tub. Did you weigh it up when you were done ?
Here is a picture of some of the chips. Each pail weighs in excess of 100 pounds, so there is 500 pounds here. I saved these because I have a customer that puts cast iron chips around some of his trees. He says it has some nutritional value.
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Old 12-12-2012, 11:05:12 AM
Tony Thompson Tony Thompson is offline
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Default Re: Gas Traction Big 4 from Blomgren Estate


Allen, If you have extra cylinders left over, (post #605),
maybe you should build a "Big Six" for your next project
Tony
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  #610  
Old 12-12-2012, 01:22:00 PM
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Default Re: Gas Traction Big 4 from Blomgren Estate

Iron helps evergreens be darker green, they say.
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