Cam timing on a shaved head

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Feb 3, 2004 | 01:30 PM

Griffin@Camtech

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Joined: Jan 2004

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From: Charleston, sc, USA

Cam timing on a shaved head

I know shaving a head retards camshaft timing but how much? My head has been milled 20 thousandsths how man degrees of advance do I need to bring me back to 0?
Thanks

Feb 3, 2004 | 02:11 PM

street dreams

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Joined: Oct 2002

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From: chillin in that city called queen creek, but homes the atl

Re: Cam timing on a shaved head (EK2NR)

yeah i would like to know too

Feb 3, 2004 | 02:31 PM

Rocket

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Joined: Mar 2002

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Re: Cam timing on a shaved head (streetdreams02)

On a B-series the cams gears are 100mm in Dia. So the circumfrence of the cam gear is 314mm (100mmxPI). Divide 360 degree by 314 = 1.14 degree per mm.

So for every 1mm milled the cam gears will roll back (retard) 1.14 degrees at the cam or 2.3 degrees at the crank.

So you have a 0.020 milled meaning 0.50mm = about 1.14 degrees retarded, so advance your gears 1 degree to compensate for the 0.020" mill.

Hopes this helps you guys out.

Oct 1, 2005 | 10:12 PM

TrackSpeedRacing

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Joined: Feb 2005

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From: San Jose

Re: Cam timing on a shaved head (Rocket)

Thanks for the info sir.

Oct 1, 2005 | 11:00 PM

scUba-stEve

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Joined: May 2003

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From: portland, or, USA

Re: Cam timing on a shaved head (Rocket)

rocket has always been "THE MAN".

Oct 2, 2005 | 09:01 AM

non-vtecpower

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Joined: Aug 2005

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From: VA

I need adjustable cam gears..But in the mean time with the stock cam gears is there anything i can do with my LS so it will run better.. The head is shaved 30 thousands

Oct 2, 2005 | 03:21 PM

hybrid_vtec

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Joined: Jul 2004

Posts: 4,640

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From: VA Beach, VA, USA

Re: Cam timing on a shaved head (Rocket)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rocket »</TD></TR><TR><TD CLASS="quote">On a B-series the cams gears are 100mm in Dia. So the circumfrence of the cam gear is 314mm (100mmxPI). Divide 360 degree by 314 = 1.14 degree per mm.

So for every 1mm milled the cam gears will roll back (retard) 1.14 degrees at the cam or 2.3 degrees at the crank.

So you have a 0.020 milled meaning 0.50mm = about 1.14 degrees retarded, so advance your gears 1 degree to compensate for the 0.020" mill.

Hopes this helps you guys out.</TD></TR></TABLE>

Nice math lesson there!

I like to play around with formulas all the time, now I have a new one to add to the list.

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Oct 6, 2005 | 05:21 PM

Power Rev Racing

Joined: Feb 2004

Posts: 2,108

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From: Ft.Lauderdale, FL, USA

Re: Cam timing on a shaved head (hybrid_vtec)

Great post. Need this in my recent topics.

Oct 6, 2005 | 07:08 PM

Used2beAb16

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Joined: Jul 2003

Posts: 1,838

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From: western, PA

Re: (non-vtecpower)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by non-vtecpower »</TD></TR><TR><TD CLASS="quote">I need adjustable cam gears..But in the mean time with the stock cam gears is there anything i can do with my LS so it will run better.. The head is shaved 30 thousands</TD></TR></TABLE>

Fat head gasket?