Once again, good answer from Hot Wings. Shims at the bases of the cylinders, thickness selected to get the deck height you need. Those get a thin coat of sealant to keep the oil in. The cylinder/head interface is left bare, no gaskets or sealant.
I haven't done the math for an annealed copper head gasket so I don't really know. I suspect, based on similar calculations of the VW cylinder surfaces:Hotwings, makes sense. So we do go ahead and use the copper as a stopgap measure to protect the aluminum?
Opinion only. NO real world experience:Opinions? Experience? Maybe brand-specific issues?
Opinion only. NO real world experience:
I won't use them for some of the reasons mentioned....And due to a Solidworks FEA simulation compared to iron. There was so much 'ripple' between the fins and general 'ballooning' under combustion load I can't think the rings manage to stay in contact with the cylinder wall between the fins. Ring land wear could also be accelerated compared to iron cylinders.
A Nikasil plated iron cylinder might be worth the expense?
Have to defer to Pops on this one. Real world experience trumps speculation.I have never had any problems with leaks using the copper gasket or any problems with loosing torque on the cylinder studs. I check the torque of the head studs at the first 25 hrs and at 50 hrs and they didn't change.
GPAS (per their engine build manual):Ok, let's recap.
Hot wings uses no gasket, no sealant. The VW factory on the Type 1 1600 used no gasket.
Pops uses a copper O-ring gasket and they crush to .060" and he works out the compression ratio.
What does GPAS, Hummel and Sonex do?
Sounds like a builder could do both with success?
In the 40 or so years I've fiddled with VWs I'd have to say that, other than some high dollar specialty heads, it's not just a feeling - it's a fact.I’m getting the feeling like the best was the original German made head.
Have to agree 100%.In the 40 or so years I've fiddled with VWs I'd have to say that, other than some high dollar specialty heads, it's not just a feeling - it's a fact.
An untouched original German head is worth whatever $$$s the person that has it is asking.
There have been other heads worth using but finding a reliable continuous source is nearly impossible.
Since my last post I’ve been reading about heads. Man, lots of people argue about heads.
What manufacturer makes the best predictable quality head? Seems like some manufacturers have really put out some garbage. I’ve been on Samba and studying the threads it seems either nobody agrees or nobody knows. MOFOCO is close to me but I’ve heard mixed reviews on quality. GB Performance? Same.
Or do people who build these for aviation use prefer to get the original German made single port heads? This is really a confusing subject. AeroVee, Casler and GPAS all use MOFOCO heads from what I gather. Is that true? How many actual manufacturers exist? Regardless of price does a manufacturer exist who makes a superior product?
I’m getting the feeling like the best was the original German made head.