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  1. C

    Building a VW Aero-Engine

    Wish I could find that thread again....
  2. C

    Building a VW Aero-Engine

    Looking at the size of the passageways in the rockers and the swivel-ball feet, I don't see how you could get a significant quantity of oil to the valve stems. But if it keeps the exhaust valves cool, the HVX mods are definitely cleaner than exterior plumbing. One of the reasons I use a top...
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    Building a VW Aero-Engine

    Pops, just an idea... Since the exhaust valves are somewhat of a limiting factor in the life of our VW engines and because heat kills... I'm looking at a way to get more cool oil directly to those little critters. Whether we have a dual relief case or a single relief case, we all have the...
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    Dual electronic ignition on single module

    My concern is that putting the primary windings in parallel would double the amperage through the ignition module. I don't know if it can handle the extra load.
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    Dual electronic ignition on single module

    The SDS CPI costs more than my engine :(
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    Dual electronic ignition on single module

    The normal electronic ignition system most of us use (HAPI/GPASC) has a hall effect ignition module that operates two dual-fire coils timed 180 degrees apart. The coils have 3 ohms of primary resistance. My project engine has this fixed-timing secondary ignition in conjunction with a Slick...
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    Building a VW Aero-Engine

    That probably explains why the Revmaster intake (dual port heads) splits the flow on the way up; before gravity has any influence on the path of the droplets. This would also make one question the GPASC manifold top casting. That manifold design does not split the flow until just prior to the...
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    Building a VW Aero-Engine

    I have always wondered about the design of most aero-VW intakes. Why does the riser tube come to a dead end then the runner comes off at a 90 degree angle? Why not use a sweep that simply ends where the intake ports begin? My HAPI intakes are made with the dead end. Aeroconversion intakes...
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    Building a VW Aero-Engine

    I have never had any trouble getting the jugs out of the case....but very nice machine work!
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    High compression at altitude

    My home airport is at 5,000 MSL. I set my CR based on the lower atmospheric pressure. If I operate at lower altitudes I can simply limit the MP as suggested in the OP. However, I don't think that I would run the higher CR if I lived at sea level.
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    VW Heads for Aircraft - Billet

    My Revmaster manual has a clean and accurate solution. Drill two perpendicular holes in the boss for the cylinder head nut closest to the exhaust valve. One of the holes should be just large enough to accept the wire from the thermocouple after you remove the ring. The second hole is tapped...
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    Flywheel drive VW engine mount

    I had a Revmaster 2100-D that was single-relief as well. It was a strong engine pulling a Sonerai LTS. I fly out of Prescott, Love Field at 5,000 MSL. Even with two onboard it would climb at 500 fpm off the runway. I sold the airplane last year. I'm building a Sonerai II Mid-wing modified...
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    Flywheel drive VW engine mount

    It has the original data plate. It even shows the buyer's name.
  14. C

    Flywheel drive VW engine mount

    The engine is a 1983 H.A.P.I. The case may be an aftermarket universal case....but certainly single-relief. It has a 4-digit serial number which must have come from H.A.P.I.
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    Flywheel drive VW engine mount

    Sounds right. The gasket insulates the manifold from the carb so most of the heat transfer will need to come through the bolts. The neck of the manifold is only an inch long so I believe that the heated area will be fairly uniform between the oil chamber and the flange. If I could make it out...
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    Gasket sealant.

    My machinist builds Performance VW engines for earth-bound vehicles...been doing it for 40 years. He uses Aviation Permatex everywhere things need not to leak.
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    Flywheel drive VW engine mount

    Hey Pops! I'm building an 1835 with a Zenith carb (actually rebuilding a H.A.P.I. engine). I copied your idea for manifold heat with some modifications. The principal is the same. I have a tee shaped manifold and attached a chamber to the outside of the intake manifold where the intake...
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    VW Heads for Aircraft - Billet

    89 hp on 16 liters per hour is nothing to sneeze at. But the real reasons for a side valve engine is simplicity, weight, and reduced frontal area. No one ever said that a side valve would be as powerful or efficient as overhead valves. However, the dramatic advantages of overhead valves come...
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    VW Heads for Aircraft - Billet

    Although flatheads lose volumetric efficiency at higher RPM's I don't see any reason that they would create more waste heat. Efficient fuel burn in a flathead is challenging due to the shape of the combustion chamber. However, the fuel burned does as much work as it would in any other chamber...
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