i got the engine running better than ever as far as a can tell in neutral,still not legal yet.

it idles smoother and starts allot easier cold ,
what i did was remove the thing that must be some kind of vacuum switch servo thing for emissions. i took it out and plugged all the ports on the carb and manifold it was hooked to.

my question is ,the timing advance diaphragm on the distributer has 2 ports. one vertical and one horizontal. one goes to manifold vacuum and one went to the vacuum switcher. which one should i keep on manifold vacuum? and is it
OK to just leave the other one open?

the other thing is the secondary throttle valve diaphram,it was hooked up to the vacuum switch thing,what should i hook it to?

 

well i guess that diaphragm on the back of the carb is not the secondaries. it is some kind of kick up thing for the throttle plates. i dont even think i need it. i am going to remove it.

i have the horizontal port on the distributer hooked up to manifold vacuum. is this OK? should it go to ported vacuum on he carb?

Am i a total A hole for not having pics up yet?

 

here is a couple pics out of my 66-70 toyota repair manual. it covers all toyotas but might help you.

 

thank you my books don't show that. i have the clymer and chilton and they suck,and a 8rc factory yota manual i found on ebay.but they don't show my set up either.thats cool.

i still figure i could live without the thing that is called a positioner diaphragm unit.

but now a see that i have a retard/advance on my distributer.

i don't think i really need the retard function.i will just have a hose on the advance side of it.that would be the horizontal nipple on the end of the unit.

its hooked up above the throttle plate.

i am a diesel mechanic this is not my strong suit.it seams to me that there would not be much vacuum above the throttle plate.

where do you guys run your vacuum advance tube? above or below the throttle plate?

below the throttle plate is the only way it makes sense to me when running one hose,ignoring all previous vacuum switch emissions style routing.

thank you for putting that up there

 

this helped understand the retard distributer

http://www.firstfives.org/faq/throttle/throttle.html

 

i guess what you call the distributor is a dual vacuum advance.

some of them are retard and advance and some are both advance.

allot of performance guys are not using any vacuum advance and play with the springs for mechanical only advance and some just bump up the timing at idle RPM to where it gets all the advance it needs at 3000 or so,,and some just use the one port that gives the most advance and leave the other one unhooked.

i would like to use both if i could.but without the vacuum switch.


one will go to manifold vacuum and one will go to ported or to the air cleaner?

this is what i have to figure out. what damn nipples to stick them too.
and forget about what california says to set my timing at and what rpm to idle it at. 600 is to low for a 4 cylinder 800 is more like it ,even 850 is fine.but then my throttle plate will be open a little and without a anti run-on fuel shut of solinoid on this early carb it may want to diesel some times.

any help on this vacuum hose placement?

 

OK the port by the idle mixture screw goes above the throttle plate.
and the port on the back side of the carb by the throttle linkages is bellow the throttle plate.

i tested both side of the advance/retard diaphragm and it holds vacuum ,so its good. i hooked the above throttle plate port to the advance side and the bellow to the retard side.......then i plugged them both and set timing to 0* at 600RPM like the book says. then hooked the hoses back up and set my idle to about 700 warm. and it ran sort of $#itty and dieseled.

So piss on it. i then hooked the advance side up to the above the throttle plate vacuum port and set the timing to about 5* at 700 RPM and it runs the best that way.
i cant see a problem with that. to hell with the retard thing ,i put a short piece of hose on the retard port of the advance diaphragm to keep water out of it and I'm going to let it rip this way.

i bet this engine would run better with non 10% ethanol gas also.
the things runs and starts good. it just seems to not have a super smooth idle,but i have never heard a 40 year old toyota before so i dont know what they sound like.
its not a oil burner the thing is mint and has no miles on it