MR RICHARD T TRENK SR wrote:
> You post was unclear as to what you meant "15-20 deg" reset to 10 deg. I
> assume this means you originally found timing set at idle to be 15-20 BTDC
> and when reset to 10 deg you had loss of power??
> This "may" be an indication of another problem you have.
> With a setting as high as 15-20 deg the engine is overadvanced to start
> with but certain engines seem to like this sort of setting and give a peppy
> accel. with it. However, if that engine then builds up another 26 deg of
> cent adv. it is certainly a candidate for detonation damage !
> How is it possible for an engine to "like" an over advanced timing setting?
> There are two main answers, as follows:
> 1. The engine has very poor compression from ring and/or valve problems.
> It simply cannot detonate (knock) because it makes only low compression psi.
> 2. The engine has a badly worn timing gear/chain unit which has retarded
> valve timing to some degree.
I just recently installed a reworked head and put the distributor in
without a timing light which is probably where the 15-20 degrees BTDC
came from. The engine had about 30,000 miles (re-built) when I bought it
and now it has around 60,000. The head had some bad water ports which
caused an overheating problem so I had it reworked. I did a compression
check when I bought it and all the pistons were around 130 PSI which
seemed fine to me. A mechanic friend of mine seems to think they used
the low compression pistons when they rebuilt the engine. I haven't
checked it yet since I installed the new head cause I need to break in
the new valves for an accurate reading. The timing chain was replaced
along with the distributor about 10,000 miles ago becuase of erratic
timing problems.
Here's a thought...when installing my carbs I used 20W50 motor oil in
the dampers cause the book says to use engine oil and that's the oil I
use in the engine. Could this cause it to run a little sluggish?
Serg
This archive was generated by hypermail 2b30 : Tue Sep 05 2000 - 09:55:49 CDT