what are these... cams..
Originally Posted by AvengerZ
http://www.nissanclub.com/forums/sho...&page=15&pp=15
Need to get them on a real "Cam Doctor" to profile and degree. Unmeasurable variances of cam timing (lobe position)1/2degree or more makes a lope in the idle due to different cylinder fill rates.
I would question if any current cams are that good, OEM has been know to vary a lot but the lack of idle overlap hides these symptoms.
The SBC cams we look at are real scary quality, even the big companies have loose tolerances.
Only cam grinds I've seen that had 1/4 degree accuracy are from Comp Cams.
After I have plotted flow vs. lift on my modded heads I will get Comp to grind some blanks for me.
Still need to finish oversize valve+spring pkg install from Ferrea, finish flow work, cc heads w/new valves then have Diamond Racing make custom piston.
Maybe running new motor in a couple months.
I would question if any current cams are that good, OEM has been know to vary a lot but the lack of idle overlap hides these symptoms.
The SBC cams we look at are real scary quality, even the big companies have loose tolerances.
Only cam grinds I've seen that had 1/4 degree accuracy are from Comp Cams.
After I have plotted flow vs. lift on my modded heads I will get Comp to grind some blanks for me.
Still need to finish oversize valve+spring pkg install from Ferrea, finish flow work, cc heads w/new valves then have Diamond Racing make custom piston.
Maybe running new motor in a couple months.
Last edited by johnlotusboy; Jan 24, 2006 at 09:15 AM.
Originally Posted by johnlotusboy
Need to get them on a real "Cam Doctor" to profile and degree. Unmeasurable variances of cam timing (lobe position)1/2degree or more makes a lope in the idle due to different cylinder fill rates.
I would question if any current cams are that good, OEM has been know to vary a lot but the lack of idle overlap hides these symptoms.
The SBC cams we look at are real scary quality, even the big companies have loose tolerances.
Only cam grinds I've seen that had 1/4 degree accuracy are from Comp Cams.
After I have plotted flow vs. lift on my modded heads I will get Comp to grind some blanks for me.
Still need to finish oversize valve+spring pkg install from Ferrea, finish flow work, cc heads w/new valves then have Diamond Racing make custom piston.
Maybe running new motor in a couple months.
I would question if any current cams are that good, OEM has been know to vary a lot but the lack of idle overlap hides these symptoms.
The SBC cams we look at are real scary quality, even the big companies have loose tolerances.
Only cam grinds I've seen that had 1/4 degree accuracy are from Comp Cams.
After I have plotted flow vs. lift on my modded heads I will get Comp to grind some blanks for me.
Still need to finish oversize valve+spring pkg install from Ferrea, finish flow work, cc heads w/new valves then have Diamond Racing make custom piston.
Maybe running new motor in a couple months.
Trending Topics
Most OEM cams aren't that good, look at LS1 cams, comp cams make lots more power, less emissions and better MPG than the Oem ones.
We currently run a .540/300degree in a street SBC idle at 650rpm in drive and pulls enough vaccuum for power brake. Motor has 300+cfm Brodix heads w/open plenum ----"No Lope". The whole motor was flowbench balanced for every port. Pulls past 8000rpm.
My motor shop does formula atlantic 4age motors, sprint car (gas/alcohol), drag blower motors, exotic(Ferrari/Lotus/Lambo), vintage restoration.
If it has pistons it can be fixed or better Crosly Hot shot, Packard, You name it, if the parts need to be custom fabbed it's just time and MONEY
And yes most factory cams have less than 2 degrees of wander to the lobes but it's kinda like ignition timing, 1/4 degree is very smooth and produces a much smoother better running motor.
A lot of after market Chevy cams were around 4 degree (Crane, Crower, all the big names) .
Crane is suppose to have the new equipment like Comp cams, but I haven't verified this.
We currently run a .540/300degree in a street SBC idle at 650rpm in drive and pulls enough vaccuum for power brake. Motor has 300+cfm Brodix heads w/open plenum ----"No Lope". The whole motor was flowbench balanced for every port. Pulls past 8000rpm.
My motor shop does formula atlantic 4age motors, sprint car (gas/alcohol), drag blower motors, exotic(Ferrari/Lotus/Lambo), vintage restoration.
If it has pistons it can be fixed or better Crosly Hot shot, Packard, You name it, if the parts need to be custom fabbed it's just time and MONEY
And yes most factory cams have less than 2 degrees of wander to the lobes but it's kinda like ignition timing, 1/4 degree is very smooth and produces a much smoother better running motor.
A lot of after market Chevy cams were around 4 degree (Crane, Crower, all the big names) .
Crane is suppose to have the new equipment like Comp cams, but I haven't verified this.
Originally Posted by johnlotusboy
Most OEM cams aren't that good, look at LS1 cams, comp cams make lots more power, less emissions and better MPG than the Oem ones.
We currently run a .540/300degree in a street SBC idle at 650rpm in drive and pulls enough vaccuum for power brake. Motor has 300+cfm Brodix heads w/open plenum ----"No Lope". The whole motor was flowbench balanced for every port. Pulls past 8000rpm.
My motor shop does formula atlantic 4age motors, sprint car (gas/alcohol), drag blower motors, exotic(Ferrari/Lotus/Lambo), vintage restoration.
If it has pistons it can be fixed or better Crosly Hot shot, Packard, You name it, if the parts need to be custom fabbed it's just time and MONEY
And yes most factory cams have less than 2 degrees of wander to the lobes but it's kinda like ignition timing, 1/4 degree is very smooth and produces a much smoother better running motor.
A lot of after market Chevy cams were around 4 degree (Crane, Crower, all the big names) .
Crane is suppose to have the new equipment like Comp cams, but I haven't verified this.
We currently run a .540/300degree in a street SBC idle at 650rpm in drive and pulls enough vaccuum for power brake. Motor has 300+cfm Brodix heads w/open plenum ----"No Lope". The whole motor was flowbench balanced for every port. Pulls past 8000rpm.
My motor shop does formula atlantic 4age motors, sprint car (gas/alcohol), drag blower motors, exotic(Ferrari/Lotus/Lambo), vintage restoration.
If it has pistons it can be fixed or better Crosly Hot shot, Packard, You name it, if the parts need to be custom fabbed it's just time and MONEY
And yes most factory cams have less than 2 degrees of wander to the lobes but it's kinda like ignition timing, 1/4 degree is very smooth and produces a much smoother better running motor.
A lot of after market Chevy cams were around 4 degree (Crane, Crower, all the big names) .
Crane is suppose to have the new equipment like Comp cams, but I haven't verified this.
that was very educational... thank you!!!
wow after reading up on them they seem very reputable and proven to add 20hp on an altima. The guy even gave a member of nissanclub.com a free set to prove they are the real deal. for $600 i would say these are a steal.
Thread
Thread Starter
Forum
Replies
Last Post
bleunetizen
Engine & Drivetrain
29
Jul 2, 2011 12:26 AM