Effect on valve train with .565 valve lift.
Thread Starter
Teching In
Joined: Mar 2002
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From: Granite Bay CA
Effect on valve train with .565 valve lift. Hi,
I am looking at a cam that has pretty high valve lift. It is advertised as gross valve lift of .563 for both intake and exhaust. The cam comes with stronger springs that are matched for that higer valve lift. Most popular hydraulic aftermarket cams like B1, T1 and GM Hotcam have smaller lift than this. Is there a downside to running this much lift on a hydraulic lifter. Wear on valve seats, excess noise, or excess wear on lifter, bent pushrods? Anything else? This is a pretty good deal but I don't want a maintanence problem.
Thanks,
Scott
I am looking at a cam that has pretty high valve lift. It is advertised as gross valve lift of .563 for both intake and exhaust. The cam comes with stronger springs that are matched for that higer valve lift. Most popular hydraulic aftermarket cams like B1, T1 and GM Hotcam have smaller lift than this. Is there a downside to running this much lift on a hydraulic lifter. Wear on valve seats, excess noise, or excess wear on lifter, bent pushrods? Anything else? This is a pretty good deal but I don't want a maintanence problem.
Thanks,
Scott
TECH Senior Member
Joined: Nov 2001
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From: Chi-Town, IL
Re: Effect on valve train with .565 valve lift. Well as long as you upgrade all the valvetrain componets that would have potential problems you will be set...
All I did was titanium retainers, pushrods, springs and that was it.... <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
All I did was titanium retainers, pushrods, springs and that was it.... <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
TECH Junkie
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From: Los Angeles
Re: Effect on valve train with .565 valve lift. </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by ssscottg:
<strong>Most popular hydraulic aftermarket cams like B1, T1 and GM Hotcam have smaller lift than this. Is there a downside to running this much lift on a hydraulic lifter. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Dude, T1/B1 have nearly the exact same lift and hundreds if not thousands of people use them just fine for very long extended periods of time. Get good springs and you are all set.
<strong>Most popular hydraulic aftermarket cams like B1, T1 and GM Hotcam have smaller lift than this. Is there a downside to running this much lift on a hydraulic lifter. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Dude, T1/B1 have nearly the exact same lift and hundreds if not thousands of people use them just fine for very long extended periods of time. Get good springs and you are all set.
Thread Starter
Teching In
Joined: Mar 2002
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From: Granite Bay CA
Re: Effect on valve train with .565 valve lift. Yep, you are right many of these cams are running .56x lifts. I guess the only issue left unanswered is lifter wear, and that is dependant on spring pressure. Thanks for the good info.
Scott
Scott
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Joined: Jan 2002
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From: Texas
Re: Effect on valve train with .565 valve lift. Scott,
You cannot compare the valve lift specs of the LS1 cams to older GM small blocks. The base circle of the LS1 cam is larger than the older small block cam, giving the LS1 cam the ability to run more lift. The reason lies in the angle the roller lifter starts the ramp on the cam. Since the base circle is larger, the transition to ramp is much more linear, allowing a very nice ramp rate and, thus, the lift numbers you see associated with LS1 cams. Make sure you get the valve springs for the application and expect a bit more valve train noise. That is the only thing you will really notice.
Typically, when you move in a smoother and controlled maner, you will not do as much wear as hitting it harder, ie a solid lifter cam. I drove my MTI B1 for 20K miles with no valvetrain issues. Others on this board have a ton more miles on LS1s with high lift cams and no issues.
Todd
<small>[ March 27, 2002, 04:38 PM: Message edited by: BLK 98WS6 ]</small>
You cannot compare the valve lift specs of the LS1 cams to older GM small blocks. The base circle of the LS1 cam is larger than the older small block cam, giving the LS1 cam the ability to run more lift. The reason lies in the angle the roller lifter starts the ramp on the cam. Since the base circle is larger, the transition to ramp is much more linear, allowing a very nice ramp rate and, thus, the lift numbers you see associated with LS1 cams. Make sure you get the valve springs for the application and expect a bit more valve train noise. That is the only thing you will really notice.
Typically, when you move in a smoother and controlled maner, you will not do as much wear as hitting it harder, ie a solid lifter cam. I drove my MTI B1 for 20K miles with no valvetrain issues. Others on this board have a ton more miles on LS1s with high lift cams and no issues.
Todd
<small>[ March 27, 2002, 04:38 PM: Message edited by: BLK 98WS6 ]</small>
