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Alright, I had this post which JUST VANISHED after two or three helpful souls had chimed in on it. Here goes edition #2.
It was about 5.9's with a Lucas CAV pump that use static timing on the pump gear at the letter G for the firepump application as opposed to the letter D on all other applications.
With the letter G static timing is actually retarded about 5 degrees for easy starting after which the dynamic timing advances 5-6 degrees on top to arrive at an algebraic sum of maybe 0. All other applications of this engine using the same pump are timed to the letter D which is about 0 retard/advance and with the same above cited dynamic advance end up running with about 5-6 degrees of advance.
My problem is that the G timing results in rough idle and an NO acceleration above 7-800 rpm. If I swing the timing over to letter D then I can spool up to about 1900 rpm at which time the same condition is caught up with, no acceleration above 1900 without a LOT of missing and violence. This engine red-lines at 2500 and shuts down at 2700 which I take to mean that I should get those speeds without any cause for alarm.
my test-run videos can be seen @
http://trixtar.org/3/tinkerings/12valve208hp/index.html
I made a _possibly_ interesting discovery today while poking around in the pump. It may be that I caused the condition myself during disassembly or it may be that it had been as I saw it when I did. I'll know tomorrow when I run it again. Anyay, I did put it back together the right way.
The inlet from the filter 'end' assembly has a little check piston at the bottom, the spring underneath that was lying on its side because it was designed by Murphy. So at this point I wonder what the result of such a fubar could be theoretically at least. There wa s also some small paint chips in that mesh filter, everything got cleaned up real nice.
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Originally Posted by fitterski
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