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jdemaris
04-19-2005 20:39:01
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Re: Case 450 Fuel Injector Question in reply to John Van Valkenburgh, 04-19-2005 16:44:04
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In my opinion, you're throwing your money away on so-called "rebuilt" pencil injectors. If you don't have a tester on hand, you don't know if what you are getting is any better than what you already have. As you've already alluded to, there is no good way to rebuild pencil injectors since major wear items are not replacable. I just had a bad experience with brand-new injectors. I bought eight new Stanadyne injectors for my Ford IH powered truck. Pulled the old injectors out, and started installing the new ones, testing them beforehand. Three out of the eight new injectors were bad. Anyway, back to your question. Main thing is you want your injectors even, i.e. & e.g. same opening pressure, same spray angle and orifice size. Sac hole length is not going to be a critical issue. You want all four cylinders getting the same amount of fuel, at the same time, and atomized the same way - so one cyinder won't be producing more or less power than the others. Gets a little more confusing when you are mixing brand new injectors with used ones - that because new injectors usually take a drop in opening pressure once they get used a while. So, sometimes it's okay to install new injectors that are set a little higher than used ones. With your Stanadyne/Roosamaster injectors - 19993 or 20348 have a 160 degree spray angle, .011" orifice size, and used opening pressure of 2950-3050 PSI. 18054 or 17206 have a spray angle of 160 degress, .011" orifice size, and used opening pressure of 2550-2650 PSI. I can't think of any reason why you can't use the older injectors as long as you install them as a set. They have no affect on fuel delivery amount - but they do slightly affect cold starting, and overall efficiency. Higher pressure equals finer atomization of fuel - and subsequently a better running engine. The difference is small, but the injectors your engine are supposed to have open at a higher pressure - at least with factory settings. I have no idea what they are set at now. I don't know if I gave you any useful answers or not. If it was my engine - I'd wouldn't use "rebuilt" injectors. Heck, you can buy a brand-new injector tester for $100 - and test, clean, and set your own injectors for probably less money than you paid for the "rebuilts." I just went through this with a Case 207D in my 580CK. I found a place selling "rebuilt" injectors for $25 each. I called him up and quizzed him a bit about what he does in the rebuilding process. After a short conversation, I opted to buy new ones. Case dealer charged $81 apiece and the Stanadyne/Roosmaster dealer wanted $102 apiece. Either way, a lot more than I wanted to spend - but - I bought them from Case. I know, if I bought the "rebuilts", it would just cause problems later.
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