And that compression increase had to come from stroke change. So it's got a few things going on different. I saw some items somewhere in the past about the valves and/or cams different on the L37 but no source to qualify either.
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piston, combustion chamber or even head gasket thickness could have contributed to the compression ratio difference...
i may be able to pull cam specs for different years/motors. what do you want compared? |
Just recent LD8/L37. If there was difference then a swap could change things. The LH2 was never made for tranverse mount. Don't see that swap happening.
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i'm not very familiar with the N* generation, but IIRC, it's 93-99, 00-04 and 05-present?
i'm guessing you'll want the 05-up stuff? |
04-05 is really all we have to deal with in this Section. I believe the changes were minor for 04 to 05. GM never changed the advertised power between the years and I don't know of any changes.
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2004 Cadillac Seville with L37:
exhaust duration at .006: 246* intake duration at .006: 251* exhaust lobe lift: .2339" intake lobe lift: .2421" overlap at .006: 2.04* cam event timing: intake open: .3* ATDC intake centerline: 122* ATDC intake close: 246* ATDC exhaust open: 229.3* BTDC exhaust centerline: 110* BTDC exhaust close: 11.2* ATDC rocker ratio of 1.68:1 want spring rates and valve diameters as well? :lol: |
2004 Seville with LD8:
exhaust duration at .006: 236* intake duration at .006: 242* exhaust lobe lift: .2339" intake lobe lift: .2421" overlap at .006: 1.98* cam event timing: intake open: 1.3* ATDC intake centerline: 117* ATDC intake close: 237.9* ATDC exhaust open: 226.1* BTDC exhaust centerline: 111* BTDC exhaust close: 5.1* ATDC rocker ratio of 1.68:1 |
Originally Posted by RobertISaar
(Post 1517918)
want spring rates and valve diameters as well? :lol:
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04 Seville L37:
exhaust valve head diameter: 1.142" intake valve head diameter: 1.426" valve spring free length: 1.663" valve spring thickness: .1618 X .1291" valve spring ID: .7087" valve spring OD: 1.0327" spring height, valve closed: 1.378" spring height, valve opened: .9646" spring load, valve closed: 50lb spring load, valve opened: 136lb approx number of coils: 7 04 Seville LD8: exhaust valve head diameter: 1.142" intake valve head diameter: 1.426" valve spring free length: 1.663" valve spring thickness: .1618 X .1291" valve spring ID: .7087" valve spring OD: 1.0327" spring height, valve closed: 1.378" spring height, valve opened: .9646" spring load, valve closed: 50lb spring load, valve opened: 136lb approx number of coils: 7 |
Well now we know. :thumbup2
Same valve setup and different cams. Sorry about the hijack Matt, :D Seems this thread took a hard left turn. |
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