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Special Cylinder Head
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16-03-2020, 05:38 AM
(This post was last modified: 16-03-2020, 05:51 AM by Tony Press.)
I cannot find it but was there a picture posted of the special cylinder head which used a variation of the block side water inlet manifold as the head water outlet manifold - or am I imagining things.
16-03-2020, 08:45 AM
Is there any advantage to using one of these heads over a late Ruby h/c head ?
I am always interested in any information about Rosengart details or current owners.
16-03-2020, 09:07 AM
I have always found them rather harsh Derek.
Or a Speedex perhaps?
Better than the Supaloy in my humble opinion - at least I though so when I was considerably younger. My Nippy went like the clappers with a Speedex head, but I felt the compression ratio was a bit high for it to last. As has been commented before, no idea how much it may have been skimmed. 
16-03-2020, 12:30 PM
I think the main advantage the Supaloy head had over the 37 head was that you were less likely to foul plugs in a worn engine. The same was true of the Speedex.
I ran both on my special, it went better with the Supaloy than the Speedex, but it wasn't a direct swap on the same engine so maybe not a fair comparison.
16-03-2020, 10:35 PM
Thank you for the quick response - as I thought they do exist !
We have found a water manifold but no head so far 
16-03-2020, 10:53 PM
In my experience the manifold is considerably rarer than the head.
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