Why aren't more of us running huge duration cams and advancing the piss out of it?
03-20-2003, 05:22 PM
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Why aren't more of us running huge duration cams and advancing the **** out of it? I was having some discussion with a buddy of mine, and we both wondered why more people aren't running huge cams and advancing them say 7-8 degrees.
Flycutting would most likely be in order, but other than that, the advancing would help out the idle and lower the peak power band into a usable rpm range.
Could a 240/234 cam advanced 7 or 8 degrees run as smooth as a 230/224 cam run straight up? How would the powerbands compare?
I'm sure people would go the extra mile and flycut if it would allow them to run a bigger cam and make an extra 10+rwhp assuming drivability would remain the same.
What would the pros and cons be to running huge cam with a lot of advance ground in.
<small>[ March 20, 2003, 05:25 PM: Message edited by: verbs ]</small>
Flycutting would most likely be in order, but other than that, the advancing would help out the idle and lower the peak power band into a usable rpm range.
Could a 240/234 cam advanced 7 or 8 degrees run as smooth as a 230/224 cam run straight up? How would the powerbands compare?
I'm sure people would go the extra mile and flycut if it would allow them to run a bigger cam and make an extra 10+rwhp assuming drivability would remain the same.
What would the pros and cons be to running huge cam with a lot of advance ground in.
<small>[ March 20, 2003, 05:25 PM: Message edited by: verbs ]</small>
03-20-2003, 05:28 PM
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Re: Why aren't more of us running huge duration cams and advancing the **** out of it? Most people don't want to fly cut pistons, or check their PtoV clearances, or run as much gear as they would need to make the combos work. Not to mention when you get up around 600-620 lift you are looking at double springs for the most part and stock headed folks won't want to pull their heads off to machine the spring pockets.
I ran a 236/240//111 cam called the Lumberjack back in 2000/2001.
I ran a 236/240//111 cam called the Lumberjack back in 2000/2001.
03-20-2003, 05:38 PM
#3
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Re: Why aren't more of us running huge duration cams and advancing the **** out of it? Major advance would not be necessary, but extra compression would sure help tame larger cams.LS1 seems to absorb bigger cams well with power and torque increases everywhere. Where it hurts is right above idle like 1500 to 2500 rpm this area becomes very unusable, thats why gears really help top get past that flat spot. I would run 240* type cam in my car after upgrading rod bolts and using tighter tolerance hydraulic lifters.Anything spun much past 7000 rpm should use solid rollers in my opinion.
03-20-2003, 05:41 PM
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Re: Why aren't more of us running huge duration cams and advancing the **** out of it? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Pro Stock John:
<strong> Most people don't want to fly cut pistons, or check their PtoV clearances, or run as much gear as they would need to make the combos work. Not to mention when you get up around 600-620 lift you are looking at double springs for the most part and stock headed folks won't want to pull their heads off to machine the spring pockets.
</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I agree with what you said, but there are still a ton of us out there who'll flycut and check PtoV anyway. There are also a lot of us with heads out there, so you'd think more people might line up at the opportunity.
I was thinking about maybe a 240/234 in my car with a ton of advance ground in. Isn't that how big Jason's solid roller is? <img border="0" alt="[evil]" title="" src="graemlins/gr_devil.gif" />
If idle doesn't get worse than my current cam, I'd consider it. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
<strong> Most people don't want to fly cut pistons, or check their PtoV clearances, or run as much gear as they would need to make the combos work. Not to mention when you get up around 600-620 lift you are looking at double springs for the most part and stock headed folks won't want to pull their heads off to machine the spring pockets.
</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I agree with what you said, but there are still a ton of us out there who'll flycut and check PtoV anyway. There are also a lot of us with heads out there, so you'd think more people might line up at the opportunity.
I was thinking about maybe a 240/234 in my car with a ton of advance ground in. Isn't that how big Jason's solid roller is? <img border="0" alt="[evil]" title="" src="graemlins/gr_devil.gif" />
If idle doesn't get worse than my current cam, I'd consider it. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
03-20-2003, 05:44 PM
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Re: Why aren't more of us running huge duration cams and advancing the **** out of it? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by LS1derfull:
<strong> Major advance would not be necessary, but extra compression would sure help tame larger cams.LS1 seems to absorb bigger cams well with power and torque increases everywhere. Where it hurts is right above idle like 1500 to 2500 rpm this area becomes very unusable, thats why gears really help top get past that flat spot. I would run 240* type cam in my car after upgrading rod bolts and using tighter tolerance hydraulic lifters.Anything spun much past 7000 rpm should use solid rollers in my opinion. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I was thinking for someone who wants this to be a dialy driver still, with not a ton of compression, advancing the cam a lot would help the idle and would bring the power band down to 7000rpms or just below.....
<strong> Major advance would not be necessary, but extra compression would sure help tame larger cams.LS1 seems to absorb bigger cams well with power and torque increases everywhere. Where it hurts is right above idle like 1500 to 2500 rpm this area becomes very unusable, thats why gears really help top get past that flat spot. I would run 240* type cam in my car after upgrading rod bolts and using tighter tolerance hydraulic lifters.Anything spun much past 7000 rpm should use solid rollers in my opinion. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I was thinking for someone who wants this to be a dialy driver still, with not a ton of compression, advancing the cam a lot would help the idle and would bring the power band down to 7000rpms or just below.....
03-20-2003, 06:40 PM
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Re: Why aren't more of us running huge duration cams and advancing the **** out of it? If you advance the cam too much the exhaust valve will open too soon and hurt power.
03-20-2003, 07:08 PM
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Re: Why aren't more of us running huge duration cams and advancing the **** out of it? I understand what your after here but i have found with large intake lobe valve is allready opening sooner even with cam close to straight up. So this approach is only worth a little towards taming cam characteristics.These specs with a solid roller would idle better and be more responsive off idle
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03-20-2003, 07:20 PM
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Re: Why aren't more of us running huge duration cams and advancing the **** out of it? an ideal cam for ANY motor shouldn't have that much advance/retard in it. If you have that much or your motor runs best with it that way, you have the wrong cam in your motor
03-20-2003, 07:28 PM
#9
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Re: Why aren't more of us running huge duration cams and advancing the **** out of it? The LGM G5-X2 cam definitely shows that big cams can work especially in light of Rageman's trap speeds. With a strong set of stage II heads his stock bottom end, 3300 raceweight car might hit 126mph trap speeds. I am thinking a cam like this needs to be +2 or +4 but have no idea. But the performance is strong. Folks have been advancing cams +2 to +4 for a long time with cars but I think that +7 is too much but I am not qualified to answer.