Thanks everyone for your responses. I hadn't run a wet comp
as it was pretty late. I was just happy the comp numbers were well
So this morning I re-ran all my tests, including a full 'wet'
compression test. (I used 5cc of MMO (Marvel Mystery Oil)
in each cyl. No plugs in carb throats NOT opened.
So to repeat... last nights dry readings were
dry: 1-175 2 -152 3-172 4- 175 5-178 6-198
this mornings readings were
dry: 1-178 2 -160 3-178 4- 180 5-182 6-199
wet: 1- 218 2 - 200 3-220 4 - 220 5-224 6-250
I just checked out the carbs and they are VERY clean inside
with almost no needle wear. So I'm about to head out and
pick up a cherry bomb muffler and a few hoses so I plumb in
the spare radiator and fire this puppy up on my home made
stand. Yep... complete with gauges, radiator and etc.
I guess I'll have to take some pics and post 'em :-)
----- Original Message -----
To: "CARS nass@yahoogroups." <firstname.lastname@example.org>
Sent: Friday, July 15, 2005 9:48 PM
Subject: compression readings....
> just finished playing with a newly acquired, but used GT6 engined.
> KD series...relatively clean...supposedly under 50K orig miles.
> Pulled the plugs...not bad looking. none sooted or oil fouled.
> Pulled the dist and pedestal so I could look down in the crankcase.
> It actually looks OK. Filled it with oil, and spun up oil pressure
> via my electric drill and homemade adapter to mate to the oil pump
> shaft. Oil pressure came right up to 50+psi even at slow drill speeds.
> Dropped the cam gear and dist back in. Bolted on a spare starter.
> All this was in prep for a compression test.
> (three different gauges were used to verify these readings)
> comp readings came up as:
> 1-175 2-152 3-172 4- 175 5-178 6-198
> Were the KD series 2L 6's really that high a compression? (cyl 6 reading)
> Obviously #2 & #3 are the low ones...somewhat expected as they
> usually run hotter than the rest. So with these readings would the
> be simply re-lap the valves..or is a full ring job in order.
> ..again remembering there was no fouling of the plugs. They almost looked
> Paul Tegler