nissan720 Posted July 23, 2020 Author Report Share Posted July 23, 2020 thank again datzenmike for the response those dizzy are plentiful in my local salvage yard. i will pick up one just to have around. 1 Quote Link to comment
datzenmike Posted July 23, 2020 Report Share Posted July 23, 2020 Pretty sure an L20B distributor will fit a Z24 so it should work the other way round. Worth a try. 1 Quote Link to comment
nissan720 Posted July 25, 2020 Author Report Share Posted July 25, 2020 anyone ever tried the hot spark distributor in the lb20? looking for feedback in case i need one in the future. I HAVE BEGAN TO INVEST A LOT OF TIME AND MONEY INTO MY TRUCK.JUST WANT TO MAKE SURE I WILL HAVE PARTS TO MAINTAIN IN THE FUTURE. 1 Quote Link to comment
nissan720 Posted August 15, 2020 Author Report Share Posted August 15, 2020 I took apart a matchbox dizzy today. I noticed one slot on the cam is longer than the other.11.5 is stamped on the top of the cam.one slot checks 10.6 and the other checks 9.4.Why are the slots uneven? i want to understand this whole distributor deal. Would a factory datsun 620 shop manual explain this to me? Quote Link to comment
wayno Posted August 15, 2020 Report Share Posted August 15, 2020 I would imagine that the distributorguy would know the answer, he builds performance distributors and explained to me how to re-curve my matchbox so the engine would quit knocking. He has not been here since the middle of July, if no one else answers the question them PM him. 1 Quote Link to comment
datzenmike Posted August 15, 2020 Report Share Posted August 15, 2020 What slot are we talking about??? The '69 620 and the '80 720 used the matchbox. A Nissan FSM (factory service manual) for those years will explain how it works, yes. 1 Quote Link to comment
wayno Posted August 15, 2020 Report Share Posted August 15, 2020 I believe he is talking about the 2 slots where the springs/weights are, as one is longer than the other. 1 Quote Link to comment
nissan720 Posted August 15, 2020 Author Report Share Posted August 15, 2020 yes wayno that's exactly what i am talking about. 1 Quote Link to comment
datzenmike Posted August 15, 2020 Report Share Posted August 15, 2020 Ahhh. those slots. I wouldn't worry about them as long as the total timing at 3k is 32-340 with initial timing at 120 . The weights, springs and slot lengths determine how much total mechanical advance and how fast it comes in. I wouldn't obsess over it. 1 Quote Link to comment
nissan720 Posted August 15, 2020 Author Report Share Posted August 15, 2020 okay just wondering. 1 Quote Link to comment
wayno Posted August 15, 2020 Report Share Posted August 15, 2020 Like I said, the distributorguy likely knows why one is shorter than the other, if I were to guess I would say the shorter slot bottoms out first therefore making it harder for the second slot to bottom out which would slow down the advance at higher rpms, it might be a built in buffer, but that is just a guess. 1 Quote Link to comment
nissan720 Posted August 16, 2020 Author Report Share Posted August 16, 2020 sent distributorguy a message and hr told me why they were made like that. 1 Quote Link to comment
nissan720 Posted August 17, 2020 Author Report Share Posted August 17, 2020 is there any such thing as rebuilding a vacuum advance?i got one off of an old points distributor i picked up from the local salvage yard friday.i found a old points distributor in the truck bed of a 620.the tag on the fire wall said it was a lb20.the numbers on the distributor was D4A4-07.it was rusty so i put it in a can of evapo-rust to clean it.The shaft is stuck.so after i got the rust off. i sprayed the whole thing in PB blaster to hopefully free up the shaft. 1 Quote Link to comment
datzenmike Posted August 17, 2020 Report Share Posted August 17, 2020 D4A4-07 appears to be a '77 distributor. Mechanical advance starts @ 600 maxes out 110 @ 1950 (distributor degrees)* Vacuum advance begins @ 6.7 inches of mercury maxes at 6.50 @ 11.8 in. hg. (distributor degrees)* * for crankshaft degrees, X2 D4A4-97 isn't that helpful. Look on the body of the distributor for the part number, I can then tell you what it's from. Begins 22100-????? need the last 5 digits. 1 Quote Link to comment
nissan720 Posted August 17, 2020 Author Report Share Posted August 17, 2020 i post them tomorrow 1 Quote Link to comment
nissan720 Posted August 17, 2020 Author Report Share Posted August 17, 2020 i think that number is 22000-B8001 1 Quote Link to comment
datzenmike Posted August 18, 2020 Report Share Posted August 18, 2020 22000-B8001 is used on the '75 California 620 and '75 through '77 federal and Canada trucks. Naturally any points or EI distributor will fit and work in any 4 cylinder L series, but the 22000-B8001 is specifically curved for these years and applications... strictly an emissions thing. 1 Quote Link to comment
nissan720 Posted August 18, 2020 Author Report Share Posted August 18, 2020 (edited) i want ever use it.just picked it up because it was there.but on the other hand i guess i could just keep it in case.is there any advantage in running an all brass distributor cap. Edited August 18, 2020 by nissan720 1 Quote Link to comment
nissan720 Posted August 21, 2020 Author Report Share Posted August 21, 2020 well left the vacuum advance unhooked ,plug the vacuum ports on the carb timing set to 10 and it runs really good .driving it everywhere again.thanks for all who chimed in . Quote Link to comment
wayno Posted August 21, 2020 Report Share Posted August 21, 2020 I guess that is another way to re-curve the distributor, I wonder what the total advance is that way? 1 Quote Link to comment
datzenmike Posted August 21, 2020 Report Share Posted August 21, 2020 On 8/16/2020 at 6:37 PM, datzenmike said: D4A4-07 appears to be a '77 distributor. Mechanical advance starts @ 600 maxes out 110 @ 1950 (distributor degrees)* Vacuum advance begins @ 6.7 inches of mercury maxes at 6.50 @ 11.8 in. hg. (distributor degrees)* * for crankshaft degrees, X2 D4A4-97 isn't that helpful. Look on the body of the distributor for the part number, I can then tell you what it's from. Begins 22100-????? need the last 5 digits. If static timing is 100 and the mechanical maxes out at 110 then 310 total. I think 10 isn't enough. All L20B are 120 plus the 110 mechanical for 330.... much better 2 Quote Link to comment
nissan720 Posted August 22, 2020 Author Report Share Posted August 22, 2020 Thanks ,i set my ka24 with the matchbox dizzy at 12 and its working just fine for me. like i stated earlier vacuum advance plugged and so are ports on the weber. 1 Quote Link to comment
nissan720 Posted August 29, 2020 Author Report Share Posted August 29, 2020 well got fortunate today and found a dizzy out of a 1982 datsun 210 with 170,000 miles on it. Guyalso had some 1982 maxima dizzies as well so i picked up one of those for parts.he told me he had 3more maximas on the yard,but it was a little late when i got ther.its 2.15 hours one way from my house.i told him i would be back next Saturday morning. he has about 3500 cars . 1 Quote Link to comment
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