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Not to rain on his parade but I'm afraid in this case it's going to take more than practice. A lot more. Torch manipulation isn't everything. At minimum he's going to need better equipment for doing AL and learn what the knobs do. A little study about plasma physics wouldn't hurt either...

GTAW, Tig, and Heliarc are the same. Heliarc is simply an old name for the GTAW process...

^ This. Last I checked mine was AC. Square wave to be exact...

The primary differences between doing this in aircraft and cars is that with aircraft the cruising "road" is always flat, there's full manual control of the mixture, and the throttle is basically locked at one position. That's tough to do in a car. Changing road conditions and having to dick...

What he's asking about and what Ian is alluding to is exactly how high performance aircraft engines are operated for hours on end at power settings far greater than the appx 25% a typical car needs going down the highway. The result is cooler, fewer deposits, and improved fuel economy...

In steady state cruise you can run as lean as you like without harm to the engine as long as it's making less than 75% power. In fact it'll run cleaner and cooler slightly lean of stoich. Just make sure it's rich when it needs to be.

Either you're giving us bad information or your friend isn't half the mechanic you think he is. I suspect the second...

Rest pressure...

Iirc the valve screws into the pump. Been a while though...

If the engine runs noticeably different with the coolant sensor unplugged at operating temperature or even warm there's something wrong with it. Period. And regardless of how it seems to run otherwise the *only* way to know for sure it's working 100% is by properly instrumenting it.

Just playin' with you is all. Btw what's with the "what am sky" thing? Is that an RvB reference? Cuz if it's not I'm sort of, you know, qualified to 'splain it if you'd like...

Odd, your hands look normal to me...

The diag code detects when the sensor is open or shorted and subs the default hot value. Thereafter the EFI code (the routines that determine injection, timing, and idle) use it. The code doesn't "know" whether it's operating off the actual variable or the default, it just goes by what happens...

^ Amazing. And people wonder why I don't post much these days. Cy: Of course it does. Think about it...

Ugh. Must bite tongue...

Part number 08816-03001 but it's a lot cheaper at hobby shops where it's used in the diffs of RC cars. 50 ml of 3000 centistokes is what you want. Edit: I wrote the procedure seen on this forum but basically all that's involved is to split the halves, drain, refill and reassemble. Rather...

What makes you think modifying the ignition system will increase power? Is your stock system defective in some way?

Yes. Looking at the secondaries allows you to see exactly what the ignition system is doing in each cylinder. It can also tell you the mixture in each one. Using an ignition scope takes study and practice though. Measuring the exhaust pulse with a pressure transducer and displaying its...

The stock sending unit is a special animal. I suppose it's possible for Napa to provide such a part but my Spidey sense is tingling. The only way to know for sure is to test it per the TSRM. Since an improper sender can burn out the gage you should test that also. Both tests are simple enough...

Hmmm. It appears you've never done secondary waveform analysis or know anyone who has. Not that there aren't better tools to diagnose misfires these days...