You could be right -- there may be a third engine, or it could be the Indy engine but not your particular one. No way to know unless the mechanic from Navarro remembers something about Breedlove. Obviously Navarro either built or supplied technical information for the engine. The "American Spirit" engine was FI though, I thought I mentioned that. The only differences I've spotted is the oil system (stock oil pump on the Breedlove six -- I wonder if it coul be rigged to run dry sump?), most likely the oil pan (yours set up for one turn), and the cam. It just makes sense that the cam would be different for a "put your foot down and hold it for a while" engine vs. one that has to vary speed a good bit more. The Indy engine would need a little more torque. Salters are allowed a push start.
On December 4, 2005 Tom Jennings wrote:
Hi Frank,
I got yr msg re: specs for the 182 ci AMC six at bonneville -- I lost the message already, duh.
It seems unlikely that the engine I have here was the same one at Bonneville; the mechanic (Gary) said it was the Willow Run test motor; it's got a left-hand-only dry sump pan.
However, it's clear that Navarro probably knew how to squeeze the AMC six more than anyone at that point; making a duplicate would have been straightforward enough. Since the mechanical dimensions you gave are the same as this engine, it's likely it's a copy, of the block anyways. Mine's got the factory oil block castings still in place too, though it does seem to have been rigged somehow for dry sump. It also has the aircraft fuel pump on the end of the camshaft, with cast aluminum "Navarro" timing cover (two of those).
However the specs that I am sure of are identical. The block I can measure; but other parts were merely 'in the same pile' and I know some of them were NOT the 1967/1968 motor:
* The cast-stainless turbo manifold I have is for a FUEL INJECTED motor; it's a copy of the manifold from the later, twin-turbo, Hilborn-injected six. The early Navarro engine was carburetted. It's possible that the FI manifold is simply the early manifold with FI bosses added/drilled, or maybe it was totally different (but engineering on the smallish scale of Navarro's would hint at heavy design reuse).
* The cam I have (Winfield) has 244 degree duration; I don't know
enough about cam design to suss out what this cam was designed for:
specs are here http://www.wps.com/AMC/Navarro-turbo-motor/Navarro- Six-
camshaft-specs.txt. Thanks a million, again, to Randy Guynn for
extracting this data from the lumpy stick. Chances are great that
this is a later cam, likely the twin-turbo motor.
* I have a number of pistons, some are really odd sizes, all are True Forged, some brand new/never used, most incomplete sets. Probably astronomically expensive castings at this point.
* Still haven't got in touch with the guy who has the conn rods; he never answers the phone. I'm hoping he'll part with them, in exchange for other Navarro goodies I have. (After this potential swap I'll AMClist/eBay some of those trinkets, like 60's Moon tachs for a six! and such.)
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