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Intake cam and iginition timing relationship?

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Old Jan 22, 2003 | 08:13 PM
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Default Intake cam and iginition timing relationship?

Does advancing the intake cam advance or retard the ignition timing? Also in terms of the inner cam gear piece advancing the timing means moving it counter clock wise correct? Thanks in advance.

< kinda ticked that brand new cam gears didn't come with any instructions at all.
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Old Jan 22, 2003 | 08:52 PM
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Default Re: Intake cam and iginition timing relationship? (ActiveAero)

for every 180 of the crank the cams spin 360. therefore, each crank degree is TWO degrees at the cam. keep this in mind. think of it like this. there are 360 deg in a circle, and how many teeth on the cam gear? there are 35 on b series. therefore, each tooth from midline to midline is 10.28 degrees. if you have a cam gear that is measured in +5/-5, it is in crank degrees. each mark is two cam degrees. this is important. if you advance your cam +2 for example on a skunk2 gear that is marked +5/-5 it is actually 4 cam degrees and 2 crank degrees. Since the distributor is on the intake cam on the B series for example, you are changing the TDC refrence of the distributor when you adjust the intake cam. you should RESET the spark timing each time you adjust your intake cam. also, be careful not to tune more than 6-8 degrees of separation into a set of cams. This would be +2, -2 or more on the cams (IN +4 cam degrees, EX -4 or more), at overlap the valves can smack into each other. be wary of adjusting something you do not understand.
also, be sure your timing belt is PROPERLY TENSIONED. you will save yourself alot of problems if you do so. tuning cams has some crappy consequences for the novice tuner. be careful.
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Old Jan 22, 2003 | 09:24 PM
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Default Re: Intake cam and iginition timing relationship? (ActiveAero)

each crank degree is TWO degrees at the cam
Other way around.

For every 1 degree of camshaft rotation, the crankshaft turns 2 degrees.

If you advance the intake cam (moving the cam CCW), it'll advance the ignition timing.
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Old Jan 22, 2003 | 09:38 PM
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Default Re: Intake cam and iginition timing relationship? (IN VTEC)

if you spin the cam 180 deg from 1 to 4 TDC the crank will have turned 360... you are correct.


[Modified by MikeSarr_GSR, 6:40 AM 1/23/2003]
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Old Jan 22, 2003 | 09:45 PM
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Default Re: Intake cam and iginition timing relationship? (MikeSarr_GSR)

We all slip up here and there.
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