Topica Loopframe_Guzzi Archive
 

Subject: RE: Another Compression question

Author: brian c

Date: May 3, 2005, 9:03 AM

Post ID: 1718805672


Thanks Patrick- I do not know anything about the motor history prior to
my ownership- so anything is possible. And I went back and checked the
spec for head bolts- 32ft lbs is high factory setting, so I am using
36ft lbs- maybe my torque wrench is not calibrated properly, because at
30 ft lbs it definitely seems too loose. (so maybe I need to calibrate
my compression tester and my torque wrench if i come down to Fremont)
Also, since we are on the subject- how do you set the torque for the
allen head recessed nut on the top stud? I guess you could cut the allen
wrench and find a socket that would fit it- is that what you do?





Patrick Hayes wrote:
 


brian c wrote:
 WFO- I get a reading of 205lbs PSI - both sides identical. I have used
this exact gauge on at least 4 or 5 other loop engines over the years
and different stages of their lives, and all have registered between
130lbs and 165lbs-. I have had this engine apart and there is very very
little carbon build up. What else could be causing the high reading? I
should mention that when I torque my head bolts I generally overtorque
them about 4 ft lbs from fafotry spec (to 42 ft lbs I believe) , but I
have done this on the other motors that have been compression tested as

I have seen similar Eldo readings on a 74. Maybe it had a cam in it for

better breathing. Know anything about your motor's history? Ride down
to Fremont if you want to test against another gauge.

Careful with that torque wrench. 42 sounds waaaayyy too high.
Remember, the other end of those great steel head studs is screwed into
your nice SOFT aluminum engine block. Pretty easy to just rip out the
aluminum threads. I'd stick with the stock torque and just do it again
at 5K miles. Guzzi's do NOT have a history of blowing head gaskets.

Patrick Hayes
Fremont CA



near Berkeley, CA
'72 Eldo
'74 Eldo
'95 1100sport
'73 v7sport project

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