Chickenman

One of our local members , who is a machinist, was concerned about the effects of having the upper end of the spindle unsupported by the distributor collar. A good point actually. You have a long thin spindle and with the top end of the bushing being unsupported, you are going to get " whipping " oscillations that will eventually ovalize the bushing in the timing cover at the bottom. As this bushing gets more ovalized over time, the oscillations will become worse and worse. You could either cut the spindle just above the TC " support bushing" to minimize the shaft length and oscillation effects, or do what he did and fit a sealed ball bearing that slips over the shaft and locates in the upper dizzy support. You can then put a cover plate over that. There are various ways of doing this. Minor modifications to the dizzy support are needed and he made a collar to fit over the spindle, but a Lathe is about all you need. It made for a very neat and reliable install. I like the idea that the spindle is fully supported at the top and bottom, just like the factory design. I'll post up a link to his build when I can find it again. Edit: Took some searching but I finally found the link: http://the510realm.com/viewtopic.php?p=55643#p55643 Note: Edited as I forgot to include the wording about the bushing in the Timing Cover. I assumed every one knew that existed. And the bushing in the TC is not adequate to prevent spindle shaft whipping or " whirling ". See post #7 below with engineering link.

As per subject. Need to find a Z31 Trigger wheel for my 280ZX Turbo dizzy. Anyone have any? TIA.

Could also be a fuel tank venting problem. Drive around till problem occurs then pull over. Leave engine running and quickly remove gas cap. If you hear a big Whoooosh... you have a venting issue. A partial Vacuum builds in the Fuel Tank. Fuel pump pressure may read OK at idle, but can't maintain pressure under load, particularly on a Boosted car. ( You need to have a FP Gauge set up and readable in Real Time while driving under Load ). When you shut the engine off, the gas tank will gradually pull air in from the gas cap, alleviating the problem for a short time. Improper deletion of Evaporative Canister ( Charcoal Canister ) system can be a major source of fuel tank venting issues. People may plug off the wrong Charcoal Canister lines and don't realize that they have just plugged off the Main vent line to the Fuel Tank. Note: Emissions fuel caps are, for all intensive purposes, " Non-Vented " They will vent a small amount, but not nearly enough to prevent a vacuum from building in the Fuel Tank. Up to about 1971, Datsun used vented gas caps. Then they switched over to Emissions style starting around 1971 1/2. You can also drive the car around with the gas cap loosened if you suspect a venting problem. If problem goes away then you have confirmed the issue. Obviously do this on a half tank or less and don't go throwing it around corners or accelerating hard. And carry a fire extinguisher!!

Double post...