QUOTE(dr.tim @ May 30 2021, 08:15 AM)
Well, on #2 I think you are most of the way there with a close (enough) tune and the wideband. If your idle screws are not very responsive and there is a flat spot (or pop) coming off idle you are idling in the progression circuit. At idle, the snail should read less than 4..
The 'idle' jets actually tune the progression mix, and the idle screws tune the idle mix.
Wide band has not been set up yet but are you talking about the 4 idle mix screws at the bottom of the carbs rather than the ones that set the butterfly stops at idle? I'm not getting a flat spot or popping coming off idle. In fact, I'm surprised at how responsive it is without vacuum advance. It doesn't respond much to those mixture screws though and the snail is definitely above 4 at idle.
During my run yesterday, I was getting some slight popping coming off throttle after accelerating through a curve and especially coming off throttle downhill with engine braking. Still much to learn.
No to catch up. Saturday night I tore down the speedo/odo yet again to fix the slipping pot metal gear for a second time. What a PITA that job is. This time I used a tip I read to center punch the edges of the gear hub when deforms the metal inward to "stake" the gear to the shaft. For extra measure, I put a thin smear of JB weld inside the gear hub to convince it to stay put. While I was there, I got a drop of clock oil on a part of the needle spindle I couldn't reach before.
Put it back together and took it for a test drive. The lazy speedo needle seemed to be fixed and the odo was working properly. That felt like victory.
Moving on to yesterday's comedy of errors. The day started well. There was something about the brakes that seemed off to me. I couldn't really describe it, just something intangible. Then I realized this little sticker was on the brake reservoir when I took it out of the car. Don't know what it is and can barely read it, but I'm sure it is important, so back on it went.
Click to view attachmentYeah, that's the ticket!
More to reality, I'm surprised I haven't needed to bleed the brakes a second time after driving the car. The peddle is high and firm. If anything, it has gotten more firm as the pads bedded in. Really a little too firm for my taste. I would prefer a 17mm MC but this 19mm from 914Rubber is doing the job. It is only a preference thing.
Next I spent an hour setting up to replate the hardware to mount the heater flapper boxes. Got a really nice yellow chromate finish on them and hung them in the sun to harden. Then I turned to one of the flapper boxes that was missing the gaskets on the valves. Yes, I realize they will work fine without those gaskets but... Do you really think I could do that?
I bought a sheet of exhaust gasket material and cut new gaskets with a couple hole saws. First one is 3" of OD. The 3" saw I have on hand is not a bimetal saw so it did not want to go through the metal mesh in the gasket material.
Click to view attachmentOther than dulling the saw, that was probably a good thing because it made it easier and safer to hold the material to cut the ID with a 1-5/8" bimetal saw.
Click to view attachment Then I cut the metal mesh with snips and finished the edges on a grinder.
Click to view attachment The original gaskets are crimped in to the valve plates. For the replacements, I had some high temp adhesive left over from installing new gaskets in our clothes dryer a few weeks ago.
Click to view attachment And there we are. New gaskets.
Click to view attachment So far the day was going well and we ran into town to run some errands. When we got home, I retrieved the replated hardware that had been hanging to dry and the flapper that was sitting in the sun to help the adhesive cure and brought them into the garage to prepare to install in the car. I assembled a bolt in one barrel nut and the clamping bolt onto the flapper. Then turned to the other barrel nut and found it was missing.
I spent two full hours looking for that little f'er in the shitshow of my shop but no luck. Finally gave up and placed another Belmetric order.
I decided to go ahead and install the flappers and at least get one side of the heaters hooked up. Mounting went okay. I did cut the high temp flexible hoses from flapper to heater tubes in the longs to length. Showing off some plating, this clamp bolt is NOS.
Click to view attachment and this is the bolt donated by
@brant after replating.
Click to view attachment Here's where things really started to go to
The heater cable did not reach to the passenger side and was long on the driver's side. I probably just installed the damn thing backwards but it didn't come with any instructions. You probably don't recall that I was concerned that the cables 914Rubber sells for hood, engine, and heater are made with soft wire instead of the hardened music wire of OEM. In fact, they are so soft the feel more like aluminum than steel. The heater wire was the only one I used and I thought I could adjust the lengths by repositioning the bend where it goes through the lever on the tunnel. That worked until it didn't. One bend and the cable broke in half
I now have an OEM cable on order from Sunset Porsche. The only good news is that the heater duct circuit is not closed so dust can migrate into the heater tubes and cockpit.
After that frustration, it was time for the first real test drive already mentioned. Hopped in the car and started down the road and noticed the speedo was a little jumpy and the odo wasn't working. Drove to the nearest spot I could pull over and disconnected the cable from the gauge before heading back to the house for yet another tear down. As suspected, a tiny amount of JB weld had migrated onto the shaft and set up over night just enough to jam the mechanism. It took only a second to pop it loose and have the odometer gears spinning properly again, but the damage was done. The drive gear coming off the cable chewed up the nylon skew gear and the mechanism now has a hitch that is catching the cable enough that it winds up a little tension before releasing. That's what's causing the needle to jump and probably will shorten cable life if not corrected. Searching for a replacement gear now.
Click to view attachment Then off for the test drive. Ran great but added a couple things to the punch list. The driver's tilt mechanism is popping out so every time I sit in the seat, it pops loose and sends me flinging backward to land right on my anger nerve. Also, I had forgotten that the plastic contact socket on my right front turn signal was trash and I had cobbled it together for testing. I meant to replace it and forgot. It is not reliable on the road.
Overall, pretty minor things to work through although I'm getting tired of the amount of time and aggravation wasted replacing NSPs (New Shit Parts).