Hello again guys. I have tried to find a picture of my tractor but it seems that the only pictures I have are video and I don't know how to post a still picture out of a video.
The tractor is currently in the shop torn down because I had a problem with my valve guides. I had made some valve guides out of bronze because this is the hot setup in race cars but the bronze actually melted somewhat down towards the exhaust valve from the high heat. As soon as I get it back together, I will take a picture of it and post it.
Just to clear a few things up, My tractor started out as an Oliver 1800. The class I pull in allows us to upgrade to the Hercules engine that was used in the Oliver 2050 and the Oliver 2150. They were almost the same tractor except the 2050 didn't have a turbo and the 2150 did. My tractor has 2150 decals on it. The Oliver 1950T used a Waukesha engine that was only 310 Cu. In. and was prone to throwing a rod. These are not the hot setup for a pulling tractor with high boost.
The Oliver tractor co. was bought by White and they made 2 tractors using the Hercules engine. The 2-135 and the 2-155. They both had a turbo but the 2-155 was rated at more hp I think because the fuel was just turned higher.
When I was looking for an engine for my tractor, I found a few ld motors but they did not have the right manifolds that I needed so I bought a motor from a 2-155 White. The only difference I see in this motor and an ld engine is the manifolds, the water pump, the timing cover, timing gears and the injection pump. This White engine was pretty worn out so I happened to find an ld-465 on ebay and bought it for $100.00. It turned out that this guy had 2 of the ld motors so I bought both for $100.00 each. He said if no one had bought them on ebay, they were going to the scrap yard. The one motor was froze up but the other had been rebuilt by the military and was in real good shape. I took it all apart and had it balanced but I reused the bearings They were like new. I got a set of pistons from a guy that used to pull a tractor like mine. They are stock pistons but the bowl has been filled with an aluminum slug and welded in, A new bowl has been machined in but it is about 3 inches in diameter about 3/8 of an inch deep. The cam was reground by crane cams in Florida. The heads are ported out but are still using the original valves. The valve springs and valve spring retainers have been replaced with some off of a Winston cup Nascar. The Injectors tips now have 5 holes in them instead of 2. The Injection lines are bigger than stock. The injection pump is a roosamaster just like the ones on the White tractor engines except it has a bigger head and rotor to make it pump more fuel. The turbo is a 3lm with a 2.700 intake wheel and a 2 3/4 exhaust wheel.
As far as turning up the rpms on these engines, I really don't see a problem going a few more hundred rpms. I have free reved mine to 4,000 rpms and it has held together so far and it will make 35 psi of boost just reving it in the driveway.
Now I don't think my engine would hold up running 4,000 rpms all day long. I use water injection to keep the tops of the pistons cool during a pull. I don't think I would want to buy fuel for this thing to run all day long either. It uses 2 gal to make 1 pull and that is less than 300 feet.