It was actually running pretty rich. The wideband showed in the 9-10 range.
I am working on getting it leaned out a bit. I also am working on degreeing
the cams for less overlap. With a lot of overlap you end up blowing the
mixture right out the exhaust valve and burning it in the exhaust pipe. NA
motors like overlap. Boosted motors don't.
All that happened is that a little water started to weep out the side. I
think that the motor was old and had been rebuilt poorly in the past. They
have torque to yield head bolts that shouldn't be reused. When I took the
head off I found that the motor was .020 overbore already. I suspect that
the previous owner reused the head bolts. There was no loss of compression
or mixing oil with water. It really was a fortunate break.
-----Original Message-----
From: John Wightman [mailto:johnwightman@shaw.ca]
Sent: Tuesday, May 29, 2007 12:05 AM
To: 'andy cost'; 'Roadster List'
Subject: RE: Tube framed SRL with Supercharged KA Update
-----Original Message-----
From: owner-datsun-roadsters@Autox.Team.Net
[mailto:owner-datsun-roadsters@Autox.Team.Net] On Behalf Of andy cost
"I built a
supercharged KA24DE but blew the head gasket on the dyno"
Wow, that header got HOT...!!! you only blew a head gasket??? All the blown
headgaskets I've experienced resulted in coolant going in the cylinders and
a whole bunch of steam coming out the pipe - never seen heat like that
except on a turbo going lean - usually right before the kaboom...! <:-o
What do you attribute the hot header to, and was everything ok inside?
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