kilkm Posted February 23, 2005 Share Posted February 23, 2005 I've never had the opportunity to see a nailhead engine apart but was told by someone that nailhead engines(the early ones anyway) had a hemispherical head design. Is that true and does anyone know of a site where I could see pictures of a nailhead torn down? Link to comment Share on other sites More sharing options...
Ted "Wildcat65" Nagel Posted February 23, 2005 Share Posted February 23, 2005 Nailhead is a "pent-roof" design. The valves are all in a line; this is a limiting factor in the diameter of the valves. On a "hemi" the intake and exhaust valves are canted at different angles-this makes more area for larger valves but also makes the valve train more complicated. Link to comment Share on other sites More sharing options...
Gene Brink Posted February 24, 2005 Share Posted February 24, 2005 E-mail me off line and I can send a jpeg image of a cross-section view of a nailhead. I'd attach to this if I knew how... Link to comment Share on other sites More sharing options...
brad54 Posted February 24, 2005 Share Posted February 24, 2005 Another way to describe the Hemi is that the intake and exhaust valve are across from one another, while the Nailhead has the valves next to eachother.A kinda decent analogy might be that a Hemi (hemispherical combustion chamber) looks like an orange cut in half, while a Nailhead's combustion chamber looks like a quarter of an orange.-Brad Link to comment Share on other sites More sharing options...
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