[T2] CHT with Dakota gauge

[Robert Mann]

	Chris Slaymaker, who has like me the 1600dp engine, reported :
" 380 degrees Fahrenheit for cylinder head temp (CHT) on the flat. "

	The single-plug analogue Westberg CHT on 
my 1600 dp in coolish weather but not near 
freezing typically shows, with water-injection, 
CHT 300 °F quiet town cruising -  350 °F fast 
hill-climbing (without water, 50° - 70 °F higher).
	But I have reason to believe my gauge has 
been damaged in such a way as to suppress the 
zero, so I do not advance these figures as 
reliable for direct comparison with other gauges, 
let alone provide a 'standard' range of CHT.


Sami featured:
>  I'll pull the
engine anyway to JBweld the thermocouple close to the plug.

	Isn't the circular end of the 
thermocouple lead meant to substitute for the 
spark-plug washer?
	But anyhow, what is so sacrosanct about 
that position down the plug 'ole (with or without 
the original washer) for the thermocouple 
heat-pickup?  In mine, the actual thermocouple is 
not in that circle but immediately adjoined, i.e 
a small way up the hole.
	Why not tap a hole in the head near the 
#3 spark plug and bolt the thermocouple on with 
that?  A small insulating cap over it would make 
its T nearer to that in the plug 'ole, but I 
doubt the difference is much; and as usual, the 
main significance of that gauge is to follow 
trends.  If this approach is OK, pulling the 
engine should not be necessary.



-- 
Robt Mann
Whangaparaoa, New Zealand
'73 VW 1600dp Devon camper
'53 Meteor V8
various Jawa-CZ and Jawa-NZ strokers