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If you don't need a functioning high altitude compensation (HAC) system (do you drive the Blue Ridge Parkway frequently?) I believe there's a single diaphragm Toyota advancer available that would get you the advance you need. I just refurbished an FJ60 distributor that way recently for my '76 FJ40, and will be doing another modification for another MUD member's '77 FJ40 next week. The new NipponDenso advancer I use has very similar vacuum characteristics to the advancer in the '77 2F engine. I'm finalizing a comparison to the FJ60 2F advancer vacuum characteristics this week. If it has comparable advance characteristics to the FJ60's main diaphragm I'll be offering a modification service here on MUD. I'm also looking into other Toyota/NipponDenso advancer options.
Contact Jeff, @distributorguy. He’s the one who suggested a single diaphragm advance. He professionally recurves, his price is good and he’s very timely.
I called him a while back asking him if he'd sell me the vacuum advance unit he uses. He didn't have one to sell. He suggested that vacuum advance was not needed and that a recurved mechanical advance was "good enough" for these trucks. I then asked him if he would sell me the springs that he uses on his recurve. He wouldn't sell them to me. He did say that if I sent him my distributor, he would recurve it with no vacuum advance for $400. No thanks. You can buy a whole new distributor recurved for no smog from City Racer for $295. Of course, the original 60 distributor is technically a better design, but sometimes you have to choose your battles.
The impression that he gave me over the phone was that his mechanical recurves would outperform a vacuum advance. Who am I to disagree? I just let him do his schtick. I was mostly looking for a good vacuum pot, not a full recurve, so I didn't feel like he was much help in my particular situation.
City Racer's description for the desmog distributor that he sells, includes a Toyota diagram of each of the parts on that distributor. The vacuum advance assembly shows a part number of 19220. I did a little search and found that '72 - '74 Toyota Coronas used the 19220-34210 advance pot. A cross reference put me onto Standard Motor Products PN# VC-345. The VC-345 is available from many sources including Rockauto for around $50. It may be the same advance pot or at least a suitable replacement. It is a single port advancer. Have you found this particular advancer in any of your searches?
VC-345 is for the early '70s 18RC distributor. The advance begins at the same applied vacuum as the primary diaphragm in the FJ60 distributor, but it's a much flatter curve. At 200mm HG (7.87 in. Hg), the FJ60 distributor primary diaphragm advance is 10 degrees, the 18RC advance is only 5 degrees at the same applied vacuum.
Would you have any information on the advance characteristics of the standard FJ60 advancer, like an advance curve that would be helpful. I found some info that said it had 18 degrees of advance total, all in. Any thoughts as to what might be optimum on a desmogged 2F?
Rockie, Why re-invent the wheel? If you are okay with straying from the original FJ60 distributor and if being waterproof is not a huge concern, why not just get the City Racer distributor? It's pretty much a drop in for a 2F. It is a Toyota destributor. OEM 2F 3F Distributor for Land Cruiser FJ40 FJ60 FJ62 70 Series FZJ80
