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November 2001: Setting the ring end gaps:
) ) About
the H3423 piston, Claimer recommendations are 0.026inch for the Top ring
end gap. I measure the Moly top rings end gap at 0.020 inch, which is accurate
for stock pistons.
Here is how I trim the rings: insert ring into cylinder and push it under with an old (but never used) piston. |
) ) )
Find feeler gauge that fits.
I trim the gap with doubled 400 abrasive paper. Then rings are installed on pistons. |
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Let's take advantage of it to check and measure the camshaft. According to the sources, the camshaft could be a 192I/0.390'', 202E/0.410''
or a 194I/0.383'', 202E/0.401''.
For the lifts, I measure the lift of the lifter that I multiply by
the theoretical ratio (1.5) of the rocker arm:
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) For
duration measurements, I need a degree wheel ... that I have not!
I find in a catalog a picture of one of these wheels sold 6$ A photo, a bit of processing, and here is the result(285Ko) to print. Then I glued the paper on a cover drilled on the center. et voilà! |
) First
I set the degree wheel on the TDC( Top dead Center) of n°1 piston
like explained in Rick Voegelin's book page 131. |
) I
take opening and closing measurements at 0.050" lift to be able to
compare with known cams.
I find: INTAKE : opening 11° after TDC and closing 155° before TDC Total intake duration is 360-11-155=194° Lobe center is at (194/2)+11=108° |
) Exhaust
: opening 143° after TDC
and closing 15° before TDC Total exhaust duration is 360-143-15=202° Lobe center is at (202/2)+15=116° Lobe separation is (108+116)/2=112° The cam is 4° advanced to improve the lower revs. |
) ) Modifiing
the cam sprocket to center the cam at 0°, should give 10 Hp more at
5000 RPM.
The slight loss of torque at low revs will be compensated by LPG which improves lower revs. I follow Rick's book page 133 by drilling the dowel hole in the cam sprocket. Then I put at it a washer which does the new setting. |
) ) Rick
Voegelin advises to sort all the rocker arms according to the ratio (1,5),
to hold the biggests for the intake valve. I made his stuff to mount on
a pushrod to measure exactly his vertical movement. Using the spring effect
of the hydraulic lifter, I can measure the ratio of each rocker arm by
putting a feeler gauge of 1.52mm between the valve and the rocker arm.
Then I should see the pushrod moving of 1,52mm/1,5= 1,01mm. |
) ) I
take all these measurements with the valve closed. I notice that the 16
rocker arms are roughly identical. The pushrod moves each time of 1,06mm,
giving a ratio of 1.52/1.06=1.434 , that is to say -4.5% compared to 1.5...I
retake measurement with an half open valve : I have now 1.5 exactly. OK...
I do the same with a full open valve (.383"), I find 1.57 that is to say
+4,5%. The rocker arm ratio is effectively 1.5. |
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