Recent content by Aviacs

Glad everything is working for you! While cleaning, be sure to get all the grease used on your reamer out of the guide, too. Other wise it will just turn to carbon. smt

Back in one of my early posts with all the pix, i documented a scraper made of aluminum bronze scrap. Same material as many valve guides, maybe harder than some. But it will not scratch the valve stem. To get it to fit in the sparkplug hole, the inner face is bored to the same radius as the...

Since Asian machine tool builders in the late 70's - 80's mostly copied western machines, dumbed them down, and shipped them out at a fraction of the cost; i was perplexed where the "mill-drill" idea came from. When the early 'net came along & more exposure to Euro machines, it was obvious...

There are various levels of round column mill-drills. When the actual Rongfu et al, Taiwan made units with 28" tables, 7.5" x 24" table travels & R8 spindle only cost $600 - 800 brand new (mid 1980's), they were quite good value. Everything has gone up by multiples, though, so harder to make a...

Re: finning, the common aero comparison is between traditional Lycoming cylinders (larger, fewer fins ) being designed to "withstand" heat, vs Continental being designed to "shed" heat. Also, based on fin theory, there are a range of options and a specific cross section. "more/thinner" is...

? meaning? (I don'ty see it as a pouring or cost issue, but possibly being a bit blase or even faintly naive?) No doubt. Any production foundry would prefer to quote on steady high quantities of a job that repeats year after year. That is a large commitment by both parties, though. You have...

That's interesting not least because (I assume?) they could be printed hollow (like blown shell cores) once suitable crush vs strength was determined. So are you saying that there are 3D machines that can be loaded with resinbond sand or other pyro material and print a core en bloc? How long...

You're really gonna have to explain that one. We should use cast iron heads? greater than 15:1 compression ratio? How does that style head better accommodate the ex, int, and pushrod routing for a VW? What exactly is applicable? Thanks! smt

So that lower skull cap -is- the head (sans rocker boxes); not just an outline of the combustion chamber? I'm probably being obtuse, but would need to see some dotted lines and the the water ports. Or maybe just a 3D of all the negative spaces? You probably know more about how to flow molten...

Is that a new casting with relocated ports? Or is it a lot of plugs, add-on material, and welding? It would be interesting to see how things were located around the pushrod tubes and rocker geometry. That is more interesting than the water jacket. NB: There is a 2276 VW on the nose of my...

I am not a professional pattern maker, though i have made professional patterns and core boxes. :) (Pro= they made commercial products cast in multiples that sold reasonably well. In one case, they would still be selling except my last foundry went out of business and the patterns were stolen...

^^^^^This^^^^^ Although i am not averse to aluminum case if it, too would increase reliability through better rigidity. Is someone here capable of designing such a head, perhaps relocating the ports, and making it as a single, as has been mentioned? Supposing someone were dumb enough to...

Keeping VW head thoughts in one searchable place... Whatever happened to the watercooled GP heads that were sold for a while? Some hidden defect turn up in service? Were they effective but too costly? Ineffective? (perceived?) too much extra weight? If the heads were effective and durable...

Ex valve is reduced stem on O-300. (Not a factor for mushrooming afa removal) smt edited: nevermind, read previous pages and see it has been addressed.

Wonderful airplanes. That's a GO-300 so has little value to anyone not needing GO 300 parts. Cylinders can be used on O-300, though not the other way around. (GO-300 cylinders are strengthend in the spigot area and the finning is slightly different). Perhaps some of the accessories, but GO...