sputnik 440
Capt Jim
Coloradodave, thanks for the video. I have watched it several times before and again just now. Still gives you now idea of what the entire selection of colored pump cams will do. I just got another Holley book and have gotten into it already. Nothing replaces direct experience. I moved my cam position up one click and started the engine the first time since assembly. Started right up, but idled at 2500 rpm. Shut it down and backed off on all idle adjustments. Still 2,000. Moved primary cam back to #1 position and idle cam right in at 800. Had to rally loosen the primary accel pump to no contact, but still giving shot when throttle first starts to open. Vibration was indeed causing a small shot to feed the venturis at that initial fast idle. I think the experience of this exercise has given me incite, feel, for what needs to be done on the primary. The secondary, I had this too tight as well. It was shooting fuel into the venturi at that fast idle, so I backed off on it until it no longer added fuel to carb when not wanting it, but still opening when the throttle called for it to open. I have not used the feeler gauge to set either the primary or the secondary, but am making sure the accel pump diaphragm is not being jammed at WOT. I made sure the arm still had some play.
I do have a question. Someone said they set the idle using the secondary idle adjustment screw. I believe the engine builder moved the adjustment screw to the top of the throttle lever. Not sure when to use this to adjust idle as opposed to just using the primary idle adjustment screw. Do they both do the same thing? Do they have an effect on timing, on the idle adjustment mixture settings? I found in the Haynes Holley book that one should tighten the secondary idle adjustment screw until it just touches the secondary throttle lever and go one more turn. Anyone disagree? If I am correct and the adjustment screw has been inverted so you can make adjustment from top of carb, will I have to back off on the screw instead of "adding one turn"?
Cornpatch MO, Thanks for your input and reference to cam video on Summit.
Garys1969RR....OK, I took out the primary mains......74s......what should I buy if I was buying a set of say 10 sizes? I did not pull the secondaries and look at them. Would you expect them to be different? Do you still think that I need to richen by going to 88s? When I pulled my plugs, a couple looked ok, but more than half were sooty. Not a big build up, but covered with soot.
Some one mentioned that they had success using the blue cam. Any agreement or disagreement? Again, what I am looking for it slow to med range response. I'll leave burn out and top end to the racers. Thanks again for all the time being devoted to helping me get up on that learning curve. Give me back my Alfas with mechanical fuel injection or a set of Webers and I would be more comfortable, however, with all your advice I think I will get there on the 440 with dbl pumpers. Thanks.
I do have a question. Someone said they set the idle using the secondary idle adjustment screw. I believe the engine builder moved the adjustment screw to the top of the throttle lever. Not sure when to use this to adjust idle as opposed to just using the primary idle adjustment screw. Do they both do the same thing? Do they have an effect on timing, on the idle adjustment mixture settings? I found in the Haynes Holley book that one should tighten the secondary idle adjustment screw until it just touches the secondary throttle lever and go one more turn. Anyone disagree? If I am correct and the adjustment screw has been inverted so you can make adjustment from top of carb, will I have to back off on the screw instead of "adding one turn"?
Cornpatch MO, Thanks for your input and reference to cam video on Summit.
Garys1969RR....OK, I took out the primary mains......74s......what should I buy if I was buying a set of say 10 sizes? I did not pull the secondaries and look at them. Would you expect them to be different? Do you still think that I need to richen by going to 88s? When I pulled my plugs, a couple looked ok, but more than half were sooty. Not a big build up, but covered with soot.
Some one mentioned that they had success using the blue cam. Any agreement or disagreement? Again, what I am looking for it slow to med range response. I'll leave burn out and top end to the racers. Thanks again for all the time being devoted to helping me get up on that learning curve. Give me back my Alfas with mechanical fuel injection or a set of Webers and I would be more comfortable, however, with all your advice I think I will get there on the 440 with dbl pumpers. Thanks.