compression check?
03-10-2003, 11:14 PM
#2
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Re: compression check?
You will lose some static compression with a cam change. With the increase in lift and duration the engine can't make as much cylinder pressure.You do get a side benifit that your octane requirements for the engine are reduced.Check for big differences in compression between cylinders if the high and low cylinders are within 10 to 15 percent you are ok.
03-13-2003, 07:15 PM
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Re: compression check?
like he said they should all be somewhere within around 10-15% of each other. i cant remember what mine read when i checked it a while back tho <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
03-13-2003, 07:39 PM
#5
Re: compression check?
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by really slow truck:
<strong> like he said they should all be somewhere within around 10-15% of each other. i cant remember what mine read when i checked it a while back tho <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">What does yours read right now? <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
<strong> like he said they should all be somewhere within around 10-15% of each other. i cant remember what mine read when i checked it a while back tho <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">What does yours read right now? <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
03-13-2003, 08:10 PM
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Re: compression check?
well, i screwed in the pressure gauage, turned the engine over a few times to see what it read for good ol' red2k... kept getting readings of zero <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
but then i was thinkin, doesnt it work better when the head is attached to the block? <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
<small>[ March 13, 2003, 08:15 PM: Message edited by: really slow truck ]</small>
but then i was thinkin, doesnt it work better when the head is attached to the block? <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
<small>[ March 13, 2003, 08:15 PM: Message edited by: really slow truck ]</small>
03-13-2003, 10:56 PM
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Re: compression check?
REally slow= you ***** <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> .. Man that is what i exactly what i am wanting to find out. What psi should they read?
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03-14-2003, 01:06 PM
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Re: compression check?
I would have to guess somewhere around 125-to-150psi to be the norm. I think that as long as it is over 100psi that it is within GM's specs.
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