Author Topic: Is LDA Needed (Read 2530 times)

TW · « **on:** July 15, 2006, 06:58:49 am »

When I put my engine together, the guy at the shop that rebuilds injection pumps suggested that I just use the pump from my old NA without the LDA. All it does is limit fuel at higher boosts. When I did a search on this site, I found some directions for reworking the fuel governor spring to allow more fuel. Wouldn't it be easier to just change out the top of an injector pump with the LDA for the top of a pump from a NA without one?

TW · « **Reply #1 on:** July 15, 2006, 11:56:50 am »

I first tried an injector pump with a LDA when I put the engine together, but something was wrong with that pump. The only way the engine would run at all was when the full fuel screw was in all the way. then it would barely idle. If I tried to back off the screw at all the engine would kill. This pump was recently rebuilt, but was never used with the LDA on. Does this sound like something that can be corrected with external adjustments, or is something inside assembled wrong?

nkb · « **Reply #2 on:** July 15, 2006, 10:11:43 pm »

when it runs can you throttle it? i had one of my pumps apart and i put the camplate in 180deg off and the thing would actually start but that was it, and smoke was unbearable, filled the neighbourhood within a few min.

TW · « **Reply #3 on:** July 16, 2006, 06:48:54 am »

No, I couldn't give it any throttle. I was wondering if the LDA could be so far out of adjustment that it could cut fuel flow.

nkb · « **Reply #4 on:** July 16, 2006, 08:23:51 pm »

when my pump was out 180 the thing wouldn't start well and only at WOT and the max fuel turned up, its easy to put the camplate in backwards and its a pita but you just gotta pull the pump head and check and make sure the cam pin isn't lined up with the the pully key, its supposed to be 180 from that..
after i changed that on mine it fired right up and ran perfect except for a little tuning of the screws.