Mike Stirewalt wrote: > Those hydraulic lifters you mention Mark . . . they sure work fine > in cars and everything else but Steve Bennett told me he took > hydraulic lifters out of the original HAP 1835 that Ken Cottle put in > my plane to start with. Steve said they were taking too long to pump > up and were spalling the cam lobes.
I don't know of any issues with the hydraulic lifters on Corvairs. Due to crankshaft issues (which I'm convinced are solved with the advent of the NEW 4340 crankshaft), I've had the 3100cc engine apart twice in 551 hours, and the lifters have shown very little wear, and the 2700 has never been apart after 457 hours. I've never heard the valves make any noise on startup on either engine, including the very first startup, thanks to the pre-oiling procedure I mentioned earlier this week, which pumps them up nicely. After assembly, you can glue the valve covers on and they won't need to come back off until rebuild time. GM knows how to do hydraulic lifters. On the other hand, my 2180 VW engine was spalling one of the solid lifters when I tore it apart after the sucked valve incident. And yes, both lifters and cam came from the same manufacturer (Eagle), and they were properly lubed with moly cam lube at assembly. Mark Langford ML at N56ML.com http://www.n56ml.com
