singaeger Posted January 29, 2014 Share Posted January 29, 2014 Guys Does anyone know what this piston is out of? no marking or stampings, but has BOHNALITE K A DILLAC D58302 cast on the inside was told its for a Daimler armoured car, but the dims appear to be to big even for +60 OS. diameter at piston crown 3.481'' gudgen pin hole 0.866'' piston depth 4.177'' machining hole in cntre of top of piston and chamfered top edge is unusaul. could it me of something american, halftrack etc? or possibly big Humber AC? Quote Link to comment Share on other sites More sharing options...
0 Richard Farrant Posted January 29, 2014 Share Posted January 29, 2014 Could be for a Cadillac V8 as used in the M5A1 Stuart, etc. They had a bore size of 3.500", if you measured the diameter above the top ring, it would account for the discrepancy as this is normally slightly smaller than skirt diameter. Quote Link to comment Share on other sites More sharing options...
0 Adrian Barrell Posted January 29, 2014 Share Posted January 29, 2014 I agree with Richard, usually a wise move as he's always right! The Cadillac piston specs are 3.4966 to 3.4986 for standards, height of 4.125. The bevelled crown and the thin slot above the top ring are all distinctive. Quote Link to comment Share on other sites More sharing options...
0 Richard Farrant Posted January 29, 2014 Share Posted January 29, 2014 I agree with Richard, usually a wise move as he's always right! Hi Adrian, thanks for the vote of confidence Quote Link to comment Share on other sites More sharing options...
0 fesm_ndt Posted January 29, 2014 Share Posted January 29, 2014 and the Wikipedia link http://en.wikipedia.org/wiki/Nelson_Bohnalite Quote Link to comment Share on other sites More sharing options...
0 listerdiesel Posted January 31, 2014 Share Posted January 31, 2014 Bit more information from the Specialloid catalogue: Bore 3-1/2" Compression height 2-7/32" Overall length 4-1/8" Gudgeon pin 7/8" floating Rings 2 plain 1/8", 2 RSS (Radial slotted) 5/32" It is described as a flat top piston. Peter Quote Link to comment Share on other sites More sharing options...
0 singaeger Posted February 2, 2014 Author Share Posted February 2, 2014 Thank you chaps for taking the time to delve into your archives and memories. Didnt think it was what is was reported to be, and had this one on loan. Wont now be buying the big boxfull of them. so thats saved me a few bob singe. Quote Link to comment Share on other sites More sharing options...
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singaeger
Guys
Does anyone know what this piston is out of?
no marking or stampings, but has BOHNALITE K A DILLAC D58302 cast on the inside
was told its for a Daimler armoured car, but the dims appear to be to big even for +60 OS.
diameter at piston crown 3.481''
gudgen pin hole 0.866''
piston depth 4.177''
machining hole in cntre of top of piston and chamfered top edge is unusaul.
could it me of something american, halftrack etc?
or possibly big Humber AC?
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