New World Datsuns...

Laecaon wrote:I dont run chokes on my SUs. They were half a turn rich in the winter. 28 degrees outside, and I could start my car in 1 revolution of the motor, and it would idle, though that idle was 450rpm, it would start and idle fine. Warm idle was 700rpm though so I couldnt have been too far off. I learned I could time cranking the motor over while pressing the gas pedal. It seemed as if there was a sweet spot where the motor fired instantly.

During the summer say April ish, I leaned out the carbs. They never required chokes.

Even after I had pulled my motor, and then reinstalled it 1.5 months later, it started first try.

I once changed my fuel filter in Napas parking lot. The car ran for 10 minutes with me blipping the throttle before it even pulled any fuel into the filter.

wayno wrote:These carbs have chokes on them for a reason, and it's not for looks, as said above, these do not have any type of accelerator pump, you cannot pump the pedal and expect it to start as no gas is pumped into the intake, you really do need a choke cable for dual SUs, I use mine year round, hot or cold outside when starting it for the first time that day, otherwise it will turn over for extended periods of time before it might try to start, it should start within 3 seconds with a choke, not 10 seconds or more.
I even use the choke when it sits for 7 hours(time it takes to do a job), mine will not start cold, but I try not to run it rich either, when I pull my spark plugs, I want to see a slight white/yellow color, not black(rich), if I see black, I lean out that carb even more, that is why mine are not even close to the same now, the back carb runs rich.

As I said before, you should use the weber you have, but you cannot tune a weber like you tune SUs, webers are made different, for the most part, either they work great, or they don't run good at all, I personally don't like down draft carbs, but that's just me.

Converted_to_datsun wrote:Hs2? Damn... Hs4 are the 1.5" ones, hs2 is 1/4. I did say hs2, the bolt holes and vents will line up but the center would have to be made a little bigger. The British carb sizes are funky :/ if the haven't shipped you can probably change the order but if they have they will still work

Laecaon wrote:Hovers around mid 30s degrees farenheit in the mornings, though I had no problem starting the car on a few 20 degree days.

The only difference between my summer and winter tune, is half a turn on the nuts. Plugs are tan in the summer. I dont bother calculating my MPGs, but its better than my weber which did alright.

700rpm warm idle in the winter unchoked is the goal right? It just so happens my engine will idle at 450 when cold unchoked... I havent touched my distributor timing since I installed it back in my weber days. That got 28.8mpg once on a pure HWY tank averaging 65+mph.

The only thing I would say, is I am not running super rich. Plugs just are not black enough. My friend has a weber on his truck, you can see black smoke out the tail pipe. His plugs are BLACK when you kill the motor under heavy acceleration.

Converted_to_datsun wrote:I pm'd you back. And the one in the was if where the fuel line goes into the float bowls. The one streight up is a overflow vent

Converted_to_datsun wrote:I just put fuel lines on my overflows and directed them down. Some people run them back to the firewall and down. Basically it's preference