spent some time in the engine room

Thanks to mlking I was able to spend some quality time back in the engine room with the 400 cubic inch 226 gas engine dubbed the name "timebomb". Since the valve springs dont coil bind untill over 600 lift and the pistons dont hit the valves . I am anxiously awaiting a set of rockers from jeff to arrive this week . Ohio Larry we are going to have some more valve lift. I am ready to go back to the flow bench with my 3 inch head and see where she falls off since my 3 and 4  inch heads flow identical numbers.

well I have been taking a few pics through the build . kurt hammil puts out that his engines are capable of 175 horses . So we are in hopes of  200 but realistic  flow data with some computer software says 160 hp at 2100 engine rpms. We will just have to wait and see if its a terd or a bear.

300 ft at a time . you think the name is fitting then.

Mike does larry wright have anything to do with that you tube tractor? Yes we are going to use jeffs rockers . I havent yet found a stock rocker over 1.47 and have found some as low as 1.2  actual ratio of coarse some a worn more than others . and for those who are wondering yes we played with geometry also.

Mark it depends on where it runs the speed really.  We didnt pull any last year but the year before we turned a 310 cubic inch motor a few time 5200 . We did it once in a class with youre dad but the tires I had on it wasnt working. With the rules changing to 3000  max rpms I hope 2100 will do .  We put all light stuff as possible in the motor so if we needed the rpms it would .

Most insurance companies that policy advents in antique tractor pulling have for a few years pushed for it and the natpa has done it along with others . Verry  few letting you let them eat anymore.

mlpankey wrote: Mike does larry wright have anything to do with that you tube tractor? Yes we are going to use jeffs rockers . I havent yet found a stock rocker over 1.47 and have found some as low as 1.2  actual ratio of coarse some a worn more than others . and for those who are wondering yes we played with geometry also.

mlpankey wrote: Most insurance companies that policy advents in antique tractor pulling have for a few years pushed for it and the natpa has done it along with others . Verry  few letting you let them eat anymore.

Larry I know theys stiff competition in ohio . Theys some tuff olivers and molines that float around and down in this area also. I dont think the tractor will have any promblem running higher rpms .I just dont know that the head can support the airflow demands of the piston to continue to make hp at that rpm . But who knows sometimes wheel speed is where it is.

MikeB (SD) wrote: Carl I think your right Rod Mondor from Forest Lake MN. They have about (3) of them 400 cu in WC's. As for the RPM's its the cast iron flywheel becoming hand grenades over 3000 RPM. You guys are crazy if your spinning the stock flywheels even with scattershields at 5000 rpms and that's why most pulling oranizations likmit the rpms. I read about a 930 Case running about 4000 rpms sawing itself in half in Pennsylvania a couple of years ago and he had a scattershield. It only takes one accident like this and in my case the closest transfer sled to me is already 80 miles away. Mitch when you get your new rockers I'm curious if they will contact the valve 1/16" offset like the stock Allis rockers do. The service manuals are addament that you have the offset as it contacts the valve tip and i'm not sure why. Also your findings on the rocker arms are a great free horsepower tip for anyone overhauling an Allis engine. Check those rocker arms! A used rocker arm that only has a 1.2:1 ratio is a cylinder giving up a lot of power.

 Mike I was hoping that would go right over the heads of some. This motor has been a natpa champion in the past just trying to resolve some of the issues it had when it was.The most obvious one was it looking like a steam engine at the end of the track .

I can understand the rpm limiting thing. I saw on RFDTV once, think it was from a show in Mississippi where a G6 MM came unglued big time. The slow motion showed some pretty big pieces flew pretty far.

NCWC wrote: Im interested to see some of these pictures and to see this beast on a dyno when it is completed, Email them if you dont mind joshuascronce1@live.com. Sounds like you have done your homework on the heads flowing the same numbers. What kind of valve combinations are you running? With .600 lift sure seems like that is alot of wasted valve movement. Once my heads get to .500 lift the flow numbers dont get any better but maybe im overlooking something. You are building these these engines in Tennessee?

  you may want to reread what i posted on the .600 lift.