The RD Pump,Verse's the Rosa Master

fastfarmall

Well-known Member
In 1963 when the 806 first came out they were clean burning engine,as i remember,then they switched to the Rosa Master pump and they smoked continuos. Can anyone put it layman terms, how that all worked?
 
I might be wrong, but if my memory is right the Roosa that first hit the 806 had no hydraulic advance. ( Most have been upgraded to the 856 style by now). The RD did. The RD was a good pump, just like A-B pumps on the gas / diesels. Just everything inside was IH. Even most of the o rings were exclusive to IH. That made the pumps expensive . Not sure I have seen any brand of tractor that didn't use a Roosa an one model or other. Very popular= inexpensive. Al
 
Around here the IH RD pump exploded on a regular basis. I've never seen any IH RoosaMaster 806 that didn't have the speed advance. JD 3010 and 4010, and early AC engines were all fixed phase, no advance pumps from the factory. Most 3010 and 4010 were updated with an advance housing kit later to help with hard starting cold. I still see some 3010 and 4010 pumps that were never updated though..
 
The first 806 we got in with the Roosa Master was in early 66 and one of them was for my brother in law. They did have the automatic advance on all of them. The main difference in the two pumps that affected performance (smoke etc) is that the RD pump is constant beginning of injection (advance not withstanding) where the Roosa Master is constant end of injection.

That means that on the RD as you come under a load and the fuel keeps increasing as the governor calls for it, the beginning of injection stays at same crank shaft degrees that it was at that speed with no load.

On a Roosa Master when you come under load and fuel intake increases the pumping plungers contact the the lobes in cam ring earlier in crankshaft degrees so injection takes place earlier in the cycle.

The end result is combustion takes place at a different point in crankshaft degrees so exhaust takes on a different look along with the stink I might add.
 
Thanks all that responded,especially Pete23! That was the answer i was looking for! In the neighboring town a farmer was driving his i think a 63 806, and the story i heard it went wild,and they had to cut the fuel line to stop it! Maybe it was all stretched,i was still in high school in 1963!
 
Latest trend to cutting down on exhaust smoke, even under light load in today's direct injected engines use much higher injector opening pressure. Years ago most non turbo engines used 2500 PSI pop pressure, and turbo engines used 3000 PSI pop pressure. The IH 806 was 2300 if I recall. Most newer engines have injectors set to open close to 4000 PSI or higher. Does help clean the exhaust, but makes more work for the injection pumps..
 
Great thread! although I'm not so sure about the RD engines burning cleaner. Between two RDs and 1 roosamaster, they all smoke some depending on load. They do sound and smell different; I've often wondered if that was more a function of the pump design or the "nature of the beast."

Here's another question: has anyone tried increasing the pop pressure of the nozzles on one of these to improve efficiency/performance/etc? And how much pressure will the two pumps handle?
 
Agreed, but when my was new it smoked ugly black smoke, 105 hp, at about 2,000 hours i put on the M@W turbo kit, i never installed the extra leaf spring that came with the kit,i was to busy, but it cleaned it up a quite a bit! We just had our local plow day,about 4 weeks ago,it smokes with a light haze yet, run's as good as ever !
 

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