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  #11  
Old 08-12-2010, 10:30 PM
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jesse682 jesse682 is offline
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I'm not necessarily worried about overboosting the engine at this point...it would be more testing. Are Diesels kinda new to the lawnmower pulling world? I hardly ever see a diesel puller compared to an alcohol or gas motor...
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  #12  
Old 08-13-2010, 04:46 PM
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If my memory is working with me we used turbos off geo's from the early to mid 90's. As far as aftermarket pumps go, its all custom fabricated adaptations of larger pumps onto smaller motors. Honestly I think we had about the only LARGE pump around.
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  #13  
Old 08-13-2010, 04:51 PM
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Oh yeah "overboosting" if you call yanmar or kubota tech they will tell you any boost is too much boost. Rebuilt the motor in a dixie chopper once think it was a yanmar 3 cylinder 3t84 or 82 something like that it was a turbo charged motor from factory even though its a bigger motor that turbo would probably work, on account of your going to wank to see 4000 rpm or more.
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  #14  
Old 08-14-2010, 09:53 AM
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The pump on the yanmars are already pretty big! Couldnt I just have the pump sent out to be tuned? As for boosting the motor, how about yeti g the pistons shaved down the support more compression from the Turbo? Or will it support the extra boost it'll get? Sorry for all the questions but that's what a forum is about right?
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  #15  
Old 08-16-2010, 02:19 AM
hillbilly hillbilly is offline
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The pump housing on the 72 yanmar is part of the timing cover, and that is the biggest set of guts available for that housing. The fisical size of the pump is not the determining factor the fuel delivery is. On the newer yanmars and the bigger ones, the pump is removable as a whole unit (housing unbolts from timing cover.
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  #16  
Old 08-16-2010, 02:22 AM
hillbilly hillbilly is offline
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Talking oh yeah
BTW in the circuit we ran in I think my tractor was the only tractor with an upgrade that extensive. Almost forgot ford mustang two clutch was behind diesel and alchohol motors. Cub lowboy clutch behind stock motors.
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  #17  
Old 08-16-2010, 03:38 PM
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So how did you get the pump out yours to put that bigger one in there? The 66 yanmar the pump is the same way as the 72? Maybe I can just turn the pump up? Oh boy this Tractor is gonna be heavy with this diesel and a heavy clutch.
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  #18  
Old 08-17-2010, 09:34 PM
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My old man machined the pump housing off the timing cover and welded a flat mounting plate in its place. Then we had a new gear made for a larger 3 cylinder pump. I believe the 66 is built the same. I can check into that. You can turn the factory pump up (like any other) you are just limited to the size of the barrels in it. you may also want to shave a little weight off of the governor wieghts, but be precise. Same amount off each one.
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  #19  
Old 08-18-2010, 09:08 PM
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Wow that's cool... well I'm sure they are the same. So what kind of HP would be made by just turning it up? Like 20-25 at the most? So if I take weight off the governor that would just give me a little more rpm?
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  #20  
Old 08-18-2010, 09:53 PM
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Taking weight off will make it more "flighty" ,that and a heavier spring pulling against it will allow you to runer up there in rpm. Keep in mind untill we put the engine on a dyno we had no clue how many rpm we were turning. In the stock class we were alowed 4000 or 4500 and that was checked with a photo tach. After that they made diesels in our association a 3 cylinder open class and allowed turbos, at that point no one wanted to stand next to the motor to tach it. P.S. if you are going to run past that 4500 mark I would recomend 1/4 aluminum side plates (covering the length of the block) bolted to the frame and side shields on the tractor.
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