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barned01 Regular Location: Adelaide Registered: September 2003	Re: how low can compression be before engine wont run.. Sun, 14 November 2004 11:41 I think this is the same problem i am having with my 18RGEU My compression when the engine hasn't been run (cold) is even across all the cylinders but it is considered quite low (especially according to the green book). Minimum compression should be around 140 from memory, mine is 120. On a warm day the car starts with a small amount of effort, but on a cold day it is the biggest pig of an engine to get started ever. facing the front of the engine, i rotated the engine by hand clockwise until the left most mark on the crank pulley lined up with the timing mark on the block. and i think also from memory the distributor rotor is facing about 2 0'clock If i remember the pin in the intake camshaft is in the right most hole and the exhaust camshaft has it one back (i think or they could be on the other side... ie. the left most hole for the intake and one back for the exhaust...crap i can't remember). This is the 88270 head with the smaller of the two domes on the pistons (about 5-8mm above the block face), but as i have mentioned to you before it also has a 1.5 - 2mm copper head gasket which i think is the reason my compression is low (although judging by an earlier comment in this thread i might want to see if i can advance my intake cam a little bit to see if this helps the compression...is it the same for the exhaust as well?) Compression shouldn't be more than 10 percent between cylinders. put a bit of oil in each cylinder and give it another test to see if it is the rings (see if the compression value changes ). but being such low values i would say yes, you do have an issue and this could very much be the reason why it doesn't start. I have a head gasket for an 18rc and 18rg and they don't seem to be entirely the same (one or 2 holes don't seem to be on one but are on the other), i don't know if that would make a difference? ummmm i can't think of what else you could look at, you were sure the valves were sealing when the head was off? have you checked the valve clearances...they may be staying open and not shutting entirely. exhaust valve clearances should be .29 to .39 mm intake valve clearances should be .24 to .34 mm don't give up dude i am waiting with baited breath on how your engine is going. [Report message to a moderator]

	Subject	Poster	Date
	how low can compression be before engine wont run..	people100	Sun, 14 November 2004 07:39
	Re: how low can compression be before engine wont run..	oldcorollas	Sun, 14 November 2004 07:43
	Re: how low can compression be before engine wont run..	people100	Sun, 14 November 2004 07:56
	Re: how low can compression be before engine wont run..	oldcorollas	Sun, 14 November 2004 08:52
	Re: how low can compression be before engine wont run..	oldcorollas	Tue, 16 November 2004 09:21
	Re: how low can compression be before engine wont run..	munki	Sun, 14 November 2004 09:38
	Re: how low can compression be before engine wont run..	people100	Sun, 14 November 2004 09:44
	Re: how low can compression be before engine wont run..	clubagreenie	Sun, 14 November 2004 10:28
	Re: how low can compression be before engine wont run..	barned01	Sun, 14 November 2004 11:41
	Re: how low can compression be before engine wont run..	pheonix83	Mon, 15 November 2004 07:43
	Re: how low can compression be before engine wont run..	people100	Mon, 15 November 2004 08:49
	Re: how low can compression be before engine wont run..	allencr	Mon, 15 November 2004 16:21
	Re: how low can compression be before engine wont run..	people100	Tue, 16 November 2004 08:18

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