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100 M Cam Specs
- Thread starter TodE
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Hi Tod,
These are the original specs for the 100M cam. Some cam grinders specs vary a bit on what they call their 100M cam. I doubt that it makes much difference.
Lift at valve with 1.45 rocker ratio & 0.021" checking lash = 0.420".
IO 16 deg. BTDC IC 50 deg. ABDC
EO 45 deg. BBDC EC 15 deg. ATDC
Duration intake = 246 deg. dur. exhaust = 240 deg.
Overlap = 31 deg. LCA = 106 deg.
You didn't ask, but, this cam & lifters are quite highly stressed, a bit short on lubrication, & should be ground on a very high quality blank. Cam & especially lifters should be guaranteed hardness tested to RC58 or better.
I don't feel that cams for this particular engine should be a cheap regrind on an old blank.
D
These are the original specs for the 100M cam. Some cam grinders specs vary a bit on what they call their 100M cam. I doubt that it makes much difference.
Lift at valve with 1.45 rocker ratio & 0.021" checking lash = 0.420".
IO 16 deg. BTDC IC 50 deg. ABDC
EO 45 deg. BBDC EC 15 deg. ATDC
Duration intake = 246 deg. dur. exhaust = 240 deg.
Overlap = 31 deg. LCA = 106 deg.
You didn't ask, but, this cam & lifters are quite highly stressed, a bit short on lubrication, & should be ground on a very high quality blank. Cam & especially lifters should be guaranteed hardness tested to RC58 or better.
I don't feel that cams for this particular engine should be a cheap regrind on an old blank.
D
Online
I have a DW cam/roller rocker assembly in my 100--the specs are:
Rocker rocker arm ratio: 1.48:1
IO 26 deg. BTDC, IC 73 deg. ABDC
EO 63 deg. BBDC, EC 17 deg. ATDC
It IS a bit lumpy at idle but makes whacking good power.
Rocker rocker arm ratio: 1.48:1
IO 26 deg. BTDC, IC 73 deg. ABDC
EO 63 deg. BBDC, EC 17 deg. ATDC
It IS a bit lumpy at idle but makes whacking good power.
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I have the DWR1 cam in my engine minus the roller rockers. With a compression ratio of 9.8:1, there is a slight torque gain at 2,000 rpm & a very noticeable gain up to 6,000 rpm.
The idle is steady at 1,000 rpm with a 13 pound flywheel.
Warning:
Running above 5,000 rpm not recommended without appropriate crankshaft, rod, piston, flywheel, & front damper changes.
D
The idle is steady at 1,000 rpm with a 13 pound flywheel.
Warning:
Running above 5,000 rpm not recommended without appropriate crankshaft, rod, piston, flywheel, & front damper changes.
D