240260280

Incorrect timing makes mufflers explode.

The one thing that Jim's car did that I never ever witnessed before is the 1/64" carb piston lift rod trick check for a/f at idle. It must have been the Z Therapy excellent restoration (no leaky bushings) and the fact that everything in Texas is in great repair and done right! One of my fav states!

Thanks! I thought it was a rare never-seen piece lol

Had a wonderful time visiting with @jfa.series1 for a few hours yesterday. We enjoyed his well stocked and orderly garage while turning wrenches to tune his carbs. It was a pleasure to work on a gold medallion car and to work with Z Therapy restored carbs. So clean and mechanically perfect! Thanks for the privilege! @siteunseen will be pleased to know that Jim is now a believer in "Equally Shitty" 3 cylinder tuning!!!!

Kats, I just picked up a 9/70 240z with the small tab.

Looks great! All shades of red look great on a Z!

Visited the Z barn: @kats Picked up three hen's teeth today... well a set of 4.5" wheels with tires and a gnose too. Thanks to Jim Hildred! Also got a 72 going that has not run in 15 years... gas tasted like water lol.

9-70

Pedal bolt head (9-70) Both Ends

John Passini covered most of these items in the 50s and 60s on Webers. He does not like balance tubes. He also and talks about different ways to deal with "pulsations" in the intake tract that reduce pull on the fuel from the well. I would guess that the SU is similar. Your analysis of the SU seems reasonable (3 pulsations (more) affecting a carb) however it also differs from Webers in that it draws fuel from the edge of the tract whereas fuel drawn through the Weber main is in the thick of the pulsations in the middle of the tract. The pulsations may not affect the fuel flow at the side of the throat on a CV carb. I would expect the fog you see is caused by the high velocity atomized droplets after reflecting off the closed valve. Here is a video of a DCOE and the "fog". http://www.240260280.com/Tech/Carbs/Weber/images/1 throat 3.mp4 Passini mentions that an extended (tall) aux venturi can be used to help the low end from pulsations but it makes little difference at higher rpms.

Just took these today and now they are helping a friend. Thought I'd share Figure 1 is from the 240z schematics. The schematics are more or less logical connections and do not show connector details. It shows the power, ground, antenna and back light wiring to the radio. (figure 1) The FSM gives details of the connector from the body wiring harness (from the back of the car). Figure 2 shows the 3 pin Molex-type connector. It has the two speaker wires (white and white with black stripe) and one back light power (blue). (figure 2) The photo below shows the corresponding connections on the radio unit. The molex connector has 3 male pins carrying the backlight signal(blue with red stripe) and the speaker signals (white and white with black stripe). A separate wire (red with blue stripe) carries the power. The power cable has a male bullet connector. The radio case is grounded to the metal brackets holding it. A ground wire from the small harness to the heater and fan unit has a ground wire that secures to the driver's side of the radio mounting screw (round head Philips) The photo below shows the wiring harness where the radio connects. The power connects to a female bullet pigtail (blue) of an inline fuse. The 3 pin molex has a female counterpart in the harness. Below is where the ground wire attaches (on driver's side of radio) Below is photo showing the extracted radio and heater harness mock-up. On the 9-70z, the heater harness has the ground wire to the radio.

Amazing before and after!

? I bought Bquiet on your recommendation... still in boxes...Blue.

The sad thing is that it is a Canadian company but sells in USD... I lose on convert and they lose on convert.... not really a Canadian spirit ?

Parts Car Disassembly. Removed: windshield centre console radio dash heater blower Next: Moving to engine compartment. btw photo documented everything!

Have a look at this. http://atlanticz.ca/zclub/techtips/carboncan/index.html btw one of the hoses has a reducing orifice in it

This motorcycle tuner had similar problem with rich dip at the start of acceleration. He could not tune it our with carbs so he set up reflectors in the exhaust to deal with the issue. http://www.drdyno.com/AIM_2006-06.html

Perfect timing @SteveJ I'm about to put the dash into my buddy's 73 and get it going. A zx dictributor also needs the wiring attended to. Not looking forward to the safety interlock delete issues.

Hi AK260, Blodi and I tried for over a year to address the AF dip once you get into the throttle. You can see the pain, suffering, blood, sweat and tears in this thread. https://www.classiczcars.com/forums/topic/56375-weber-selection-and-initial-jet-tuning/#comments We tried many etubes and completely disabled circuits but no significant changes to the rich dip were observed. The experiment still is not over however, it is interesting that you also see this on single circuit SU's and we see it on 5 circuit DCOE's. There is also a video of chaps down-under tuning a Z with DCOEs and then with EFI and they get the same rich dip. I did some digging and a fellow who tunes bikes had the same problem and found it to be caused by the exhaust system. Our recent thoughts for addressing this are: 1. Putting tuning reflective points in the exhaust 2. Putting anti-reversion traps in the manifold 3. Adjusting the mechanical cam timing with the 3 points on the cam sprocket If you have no luck shaping the needles, I would be grateful if you did some runs for each of the 3 cam settings to see if A/F changes in this rich area. It may possibly be tamed by valve timing as we have these odd non-cross-flow heads. Again, great work! Very impressive.

Brilliant! Excellent application of the low cost modern tools we now have. How they dreamed of these tools in the 60's! Beatles Mixer Craigslist Today

He just missed the F1!

try with the ebrake just on the far wheel.

You are at $60k USD right now ?

LIKE! (I ran out!)