Glad it worked out!
Glen
--Previous Message--
: Glen, I looked at the angles when the cam
: showed the 0.013" lift off the
: base circle as mentioned yesterday. I
: repeated the test a few times and got
: different values but all close to each
: other with a similar spread around the
: LCA. For example, in one test that I
: remember 0.013" lift on opening
: came up as 22 BTDC, on closing 59 ABDC.
: That's 22 + 180 + 59 = 261. (261 / 2
: ) - 22 = 108.5
:
: Likewise, if I found the approximate
: "max lift" point on the cam
: intake lobe, set the indicator to
: "zero" and took angle
: readings 0.005" each side of max
: lift, the average came in at 108.5
: again.
:
: So I had one set of measurements based
: on the start of lift and one set of
: measurement based each side of max
: lift. Both tests consistently came up
: with an LCA of 108.5 and I am happy
: with that.
:
: I did not make these tests on the
: exhaust lobe.
:
: I don't pretend to know the specs of
: the S2 cam beyond being told the LCA
: was 110 and the opening/closing angles
: are supposed to be 31/71 with a
: duration of 282. I cannot tell you why
: 0.013" of lift didn't occur at 31
: BTDC. Maybe 31/71 occur closer to
: 0.001" of lift. I'm not sure it
: matters if the max lift on the intake
: lobe happens when it is supposed to.
:
: Regardless, I greatly appreciate your
: help with this. I was in a total state
: of confusion regarding the cam sprocket
: position prior to your posts.
:
: Regards,
: Doug L.
:
:
: --Previous Message--
: That's a good number but I'm curious
: why
: the opening/closing points didn't come
: in right?
: To my knowledge that is a symmetrical
: grind.
: Maybe you should check with Ted to be
: sure.
: What are opening/closing points?
: Glen
:
: --Previous Message--
: Success !
:
: I tried a few different orientations of
: the 2 bolt holes on the cam sprocket
: and ended up where I started. I was
: not able to get opening to start at 31
: BTDC and end 71 ABDC with 0.013"
: of lift. However, when I used the
: 0.005" before and after max lift
: and averaged those angles... I came up
: with 108.5 degrees. Then I took the
: degree values at 0.013" of cam
: lift (before and after) and applied
: Glen's formula and again came up with
: 108.5 degrees. That tells me that I
: have found the max lift and set it at
: an acceptable position.
:
: I understand that a few degrees of
: advance may improve low end torque...
: more importantly, when the chain
: stretches, I should end up close to the
: 110 ATDC spec.
:
: Thanks to all for the help. I feel
: much better now.
:
: Doug L.
:
:
: Doug L.
:
:
: --Previous Message--
: "The indicator extension sits
: inside
: the bottom of that lifter."
:
: OK but inside the tappet is concave, so
: ANY misalignment will reflect in the
: readings to some degree.
: If the numbers don't come out right
: when you check it or you don't get
: repeatability, this is where you might
: first look as a cause.
: Try it and see what you get.
: Glad it's making some sense!
: Glen
:
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:
:
:
:
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