Yes, my car is a patchwork. S2 car with a S1 driveline (has an OD transmission).
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Enjoy.
Zenith WIP & WIA Carbs
- Thread starter AlpineII
- Start date
Update on this,
I managed to adjust the linkage on the accelerator pump linkage, backed it off so I had a gap there (which came in at around 1/8", which was the same as previously mentioned by another poster)
I did some maintenance on the ignition system, replaced the plugs/cap/rotor (wires are MSD heli core and are fine for now). Disconnected the throttle linkage and opened up the carbs to full throttle and left the plug holes open for a while when I did the plug replacement, aired the system out overnight.
With the new ignition components the car started rather easily. Of note, I did have some SeaFoam in the previous batch of fuel I was running through the car which may have contributed to the difficulty starting. Ran the car for an hour today, drove it to my brother's to get it up on his lift for the first time to look at the undercarriage. I put 20L of 94 octane into it (there is no fuel available here that is ethanol free so I will have to bring it back from the USA when I cross the line) and it seemed to perk right up once that fuel got into the system, idle picked up quite a bit and the engine smoothed out some.
Thanks everyone for your contributions
I managed to adjust the linkage on the accelerator pump linkage, backed it off so I had a gap there (which came in at around 1/8", which was the same as previously mentioned by another poster)
I did some maintenance on the ignition system, replaced the plugs/cap/rotor (wires are MSD heli core and are fine for now). Disconnected the throttle linkage and opened up the carbs to full throttle and left the plug holes open for a while when I did the plug replacement, aired the system out overnight.
With the new ignition components the car started rather easily. Of note, I did have some SeaFoam in the previous batch of fuel I was running through the car which may have contributed to the difficulty starting. Ran the car for an hour today, drove it to my brother's to get it up on his lift for the first time to look at the undercarriage. I put 20L of 94 octane into it (there is no fuel available here that is ethanol free so I will have to bring it back from the USA when I cross the line) and it seemed to perk right up once that fuel got into the system, idle picked up quite a bit and the engine smoothed out some.
Thanks everyone for your contributions
SoCal'beaming
Gold Level Sponsor
Excellent! ... Good to hear she's up and 'about.. a little top cylinder lubricant couldn't hurt!
... David
... David
bernd_st
Bronze Level Sponsor
Just digging into the power valve topic again:
First of all they can be disassembled. There is a small brass metering jet at the bottom. Which can be carefully hammered out by a hard rubber mallet on the stem. Furthermore my deep five revealed that there are various sizes of jets. So far found 65 & 80 which refers to 0.65 & 0.80 mm respectively. A jet gauge as the one in the picture pays dividends. Regarding the spring they can rust badly - especially on long non- runners. Found that a normal ball pen spring fits. The actual spring rate/ length still needs to be confirmed though. Again a couple of things learned - while I was never paying much attention on the power valves. The vast majority of the Zeniths came w/o one. At least vital to check for proper function and same jet sizes on both carbies. Check the pictures:
P.S. May consider to play around with those power valves a bit more. Perhaps they add a bit more "thrust" under high load conditions. Or were they just added to give a bit more GO in the upper rpm range to those "economy" applications ? Hmm...
First of all they can be disassembled. There is a small brass metering jet at the bottom. Which can be carefully hammered out by a hard rubber mallet on the stem. Furthermore my deep five revealed that there are various sizes of jets. So far found 65 & 80 which refers to 0.65 & 0.80 mm respectively. A jet gauge as the one in the picture pays dividends. Regarding the spring they can rust badly - especially on long non- runners. Found that a normal ball pen spring fits. The actual spring rate/ length still needs to be confirmed though. Again a couple of things learned - while I was never paying much attention on the power valves. The vast majority of the Zeniths came w/o one. At least vital to check for proper function and same jet sizes on both carbies. Check the pictures:
P.S. May consider to play around with those power valves a bit more. Perhaps they add a bit more "thrust" under high load conditions. Or were they just added to give a bit more GO in the upper rpm range to those "economy" applications ? Hmm...
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