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YelloRolla Forums Junkie Location: On your mum! Registered: May 2002	Re: 18 rgu tech questions Fri, 20 June 2003 07:29 Usually 1 mark is TDC and the other is the xx BTDC which is where you set it with the timing light. I.E I think in your case 1 will be 12deg BTDC and the other TDC. Advancing or retarding the cams will offer little in power gains, (cylinder fill would most likely be adversely affected) as would bringing the lobe centrelines closer (inlet in relation to exhaust). Generally speaking - the more overlap (inlet and exhaust open at the same time briefly) the lower the cylinder fill will be at low RPM. This is traded off with better performance at high RPM, but you need raise the comp ratio accordingly to realise the benefits. The way Toyota has done it is most likely correct. They probably used more cam grinds and timing changes to to get to that point than we will ever see. If you were to change the bottom end (big compression) then there could be benefits in playing with the cam timing. [Report message to a moderator]

	Subject	Poster	Date
	18 rgu tech questions	Mr DOHC	Sun, 20 April 2003 10:33
	Re: 18 rgu tech questions	Kergen-RA28	Sun, 20 April 2003 11:59
	Re: 18 rgu tech questions	Blaze	Sun, 20 April 2003 23:03
	Re: 18 rgu tech questions	celicaboy	Mon, 21 April 2003 10:34
	Re: 18 rgu tech questions	Blaze	Mon, 21 April 2003 22:09
	Re: 18 rgu tech questions	THE WITZL	Tue, 22 April 2003 01:44
	Re: 18 rgu tech questions	Kergen-RA28	Tue, 22 April 2003 10:04
	Re: 18 rgu tech questions	celicaboy	Wed, 23 April 2003 12:07
	Re: 18 rgu tech questions	Steve M	Thu, 19 June 2003 04:51
	Re: 18 rgu tech questions	THE WITZL	Thu, 19 June 2003 11:44
	Re: 18 rgu tech questions	M.W.P.	Thu, 19 June 2003 13:53
	Re: 18 rgu tech questions	Steve M	Fri, 20 June 2003 03:19
	Re: 18 rgu tech questions	THE WITZL	Fri, 20 June 2003 03:38
	Re: 18 rgu tech questions	Blaze	Fri, 20 June 2003 06:31
	Re: 18 rgu tech questions	YelloRolla	Fri, 20 June 2003 07:29
	Re: 18 rgu tech questions	Steve M	Mon, 23 June 2003 17:11

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