Re: Interference fit? Measurements.

[Orin Eman <orin@wolfenet.com>]

>      I pulled the head and retrieved the solder.  It had been thinned to about
> 0.040".  So this would indicate that the engine, in theory, is not
> interference fit.  With the bigger cam lobes of the '87 engine, there should
> still be about 0.015" clearance.
>      Now, this was done with the engine cold, and the cam follower was at
> nominal pressure, turned by hand.  So the later engine, at operating temp,
> with the cam followers fully pumped, at any significant speed could take up
> that fifteen thousandths fairly easily.  So again, in theory, (with a later
> engine) you might lose one or two valves if the the timing belt let go while
> it was running.

Hand turning like this also would force the crank and connecting rod bearings
to minimum clearance.  Wear limits are .006 and .005" respectively.  Add
in the connecting rod/piston pin clearance (Not specified) and you are
at .015 I'll bet.  Inertial loads will tend to add these clearances
to the position of the piston in the bore as well as stretch the rods
at TDC...  

Orin.