ChadS
05-18-2008 09:59:25
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Re: Farmall 300 bolt on HP in reply to james rumph, 05-18-2008 04:13:10
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Id be certain there is a few ponies hiding just in a dyno tune. Main objective is to make sure all your parts are in good working condition. Rocker arm tips and lifters being worn can rob power, so do what you can to recondition them. Carbs are straight forward,, when its running wide open with no load, you should be able to back the main load adjustment screw out and make it run rich,, if not, you need to rejet the main jet. That 300 should have the new style carb with the idle mix screw in the flange,, already has the larger metering stem like the 6 cyl carb bowls have,,, so only increase the main jet size. try a .100 drill bit thru the main jet if you cannot get enough fuel to make it run rich. Pump gas will be fine, I like ammoco fuels. Id keep the venturi small,,, to keep the best low end lugging power, so a 25 would be perfect,, its probably got a 23 in it now stock,,,, so a little bigger wont hurt much. whats the 23 and 25 mean??? Well, on the inside bore of the venturi, there are 2 digits casted. Example is a 25,, this is measured in 32nds of an inch,, so it will look like 25/32 and so on and so on. Distributors,, you want to make sure the mechanical advance is working, simply pull the cap off and snap the rotor,, if it does not have full travel all by itself, or feels weak, they might be something wrong and needs attention. 90% of em are broke or stuck, so do what you can to make these parts work. These are a few areas that will help make the ol 300 run a little better,,, but after its said and done and your ready to dyno tune it,, throw the text book technique the window for tuning,,, your main focus should be the 540 reading and slightly under 540 but no lower than 400 rpm on the pto tach on most dynos. Just by tuning it for those rpm ranges will help the best on the tracks for your basic low gear puller. Hope this helps,,, Oh and James,, did you make the E85 swap yet??? any results to report back?? the Big H is about a week out from firing up!!! ChadS
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