g.
--Previous Message--
: Sorry, this topic will be somewhat tired
: and familiar. I asked similar
: questions during our GT6 engine rebuild
: in 2012.
:
: I have installed the 1500 front plate,
: cam, and cam retainer plate. The
: endfloat was acceptable and much to my
: satisfaction, the pulleys lined up
: without the need for shims. It was
: time to look at cam timing.
:
: I had paint marked the old pulleys,
: chain, and cam boss before removal and
: I reinstalled them in their original
: positions. Then I mounted my
: indicators and degree wheel to find
: what the "old" cam timing
: was. I found max lift on intake #1 was
: at about 107 ATDC. OK... so how does
: that compare to what the timing should
: have been? Was there a reason the last
: owner set the cam timing potentially 5
: degrees ahead?
:
: I found conflicting bits of info for
: the stock 1500 cam on the web at the
: following two sites. I did not find a
: definitive spec in my manuals. Since I
: am using a stock Spitfire cam I did not
: look at the LCA figures for any of the
: performance cams.
: Stock 1500 LCA 110 ATDC:
: http://auskellian.com/paul/links_files/spitfire_cam_specs.htm
: Stock 1500 LCA 112 ATDC:
: http://www.teglerizer.com/triumphstuff/spitcamspecs.htm
: (Elgin data)
: Also on Paul T's web link above are the
: 1500 intake figures... 18-58... which
: should equate to (58+180-18)/2 = 110...
: which suggests an LCA value of 110 is
: probably correct.
:
: I am trying to set the cam timing
: without the head on the engine so the
: balance point method in the manuals
: isn't applicable. I have not seen
: published specs for lift at an angle.
: By flipping the cam pulley around I
: currently have the LCA set to 109 ATDC.
: That should be ideal if the LCA should
: be 110 as the chain is likely to
: stretch enough to pick up another
: degree or two. If the LCA for a stock
: 1500 cam is supposed to be 112, I would
: like to change the timing another
: couple of degrees. I would also like
: to understand why the previous owner
: may have set the cam 3 to 5 degrees
: ahead.
:
: Does anyone know the correct LCA for a
: stock 1500 cam? If not, do you know
: checking angle/lift values for the
: stock cam?
:
: Thanks,
: Doug L.
:
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