Post by
evildky »
https://forums.nicoclub.com/evildky-u13100.html
Thu Sep 13, 2007 9:14 pm
all 70-74 were dual su carb's, there are 3 variants, with the early roundtops that you have being the most deisrable
there should be no fpr, you might be looking at the fast idle dashpot that mounts kinda on top of the fuel lines
the su's are amazingly simple, the mechanical pump pumps fuel into the remove fuel bowls located ont he side of each carb, they have a very basis float and needle valve, in the bottom of the fuel bowls there is an outlet nipple, these can get clogged, just open them up and clean them out, the fuel line runs form the bottom of the fuel bowl to the bottom of the carba nd actually runs strait to the fuel jet, it has a thumbscrew on it taht you turn the jet seat up and down to richen or lean out the carbs, vacume actually draws the piston up which pulls the needle out fo the jet and allowing fuel to four into the imcoming air, sounds bad but works amazingly well
cliff notes: if it's rich, reach under each carb and turn the thumbscrew up into the carb, this closes the jet on the needle
that e88 head is from a 72-73, has the same small valves found in the e31 but larger combustion chamber for lower compression ratio, the n42 head adds a touch mroe volume but gets you larger valves
thats the thing I miss aobut n/a, the turbo l6 sounds good but the n/a sounds better
and I just noticed in your pic's looks like a series one master cylinder!? take a look at your master cylinder and see which resivoir goes to the front brakes, on a late series 2 chassis it should be the rear resivior which should be larger, but someone might have simply put the resivoirs on backwards
when getting parts the production number in your vin is more important then the production date, you'res should read something north of 14000, so when getting parts ask for a 72, datsun didn't make a clean brake when the updated and makes getting aprts 30 years later a pita