Cams size
08-25-2016, 03:39 PM
#1
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Cams size
Anyone ever run across or see any shelf cams in the 244/248-680/690 on 111 plus range. Something close would work. I'm going to do a little dyno testing with one off the shelf and custom billet designed to exact engine/head etc specs. Solid roller. I realize I'm looking at an aggressive lobe but... For a 565 NA peak hp 5,800. Seems like I ran across one to similar specs but can't find it now. Was thinking it was an old ultradyne grind but looked last night and didn't see any similar lobes.
08-25-2016, 04:40 PM
#3
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I have a Crane, Lunati, Howards, Erson, Comp cams catalogs here. Nothing "off the shelf" grind wise with that much lift that I know of or seen, with that short of a duration.
Crane's shortest duration bbc cam, with .680 lift, off the shelf, is
#139791
246/254 114 LSA .680/.680 lift.
Crane's shortest duration bbc cam, with .680 lift, off the shelf, is
#139791
246/254 114 LSA .680/.680 lift.
08-25-2016, 04:50 PM
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It might technically "peak" there. But,
Full Force had a custom 680 lift, 241/246 hyd roller in his 540 with afr partially cnc heads, single plane intake, 1050 carb, and technically, his setup "peaked" at 5900. However, at 5300 it was making 623HP. At 5900, 628HP. Only a 6hp gain over a 600RPM spread in the upper rpm band? In my opinion, that cam was done at 5300-5400ish. Not much point spinning the engine faster than about 5300-5400.
Another buddy built a NA 572 combo, with a cam supplied by a different custom cam guy..Also around 680 lift. This cam "peaked at 6100. At 5300RPM, it was making 721HP, at 5900, it was making 760HP. 600RPM spread, picked up another 40hp.
My point? IMO, peak numbers aren't the end all deciding factor on how well the cam performs.
Full Force had a custom 680 lift, 241/246 hyd roller in his 540 with afr partially cnc heads, single plane intake, 1050 carb, and technically, his setup "peaked" at 5900. However, at 5300 it was making 623HP. At 5900, 628HP. Only a 6hp gain over a 600RPM spread in the upper rpm band? In my opinion, that cam was done at 5300-5400ish. Not much point spinning the engine faster than about 5300-5400.
Another buddy built a NA 572 combo, with a cam supplied by a different custom cam guy..Also around 680 lift. This cam "peaked at 6100. At 5300RPM, it was making 721HP, at 5900, it was making 760HP. 600RPM spread, picked up another 40hp.
My point? IMO, peak numbers aren't the end all deciding factor on how well the cam performs.
08-25-2016, 07:37 PM
#5
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244/248 solid roller, for comparison sake,is closer to a 236/240 HR.....but will carry the rpm a little better.
This is assuming it is not a tight lash solid roller.
This is assuming it is not a tight lash solid roller.
08-25-2016, 08:13 PM
#6
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ZZ572 cam
254/264 hydraulic roller 632/632 lift 114 LSA
Peak power 5500RPM.
ZZ572 720R engine
266/274 .714 lift 114 LSA solid roller. Peak power at 6250rpm.
A buddy of mine shoe horned a zz572 620HP crate engine in his 64 Chevelle. Timing set at the recommended 8* at idle in the manual. That thing idled very nice. 9.5:1 compression engine. There was no such thing as a lack of torque in that engine. In that little chevelle with a TH400 and a tight converter and some drag radials, it was a monster, and a hoot to drive.
254/264 hydraulic roller 632/632 lift 114 LSA
Peak power 5500RPM.
ZZ572 720R engine
266/274 .714 lift 114 LSA solid roller. Peak power at 6250rpm.
A buddy of mine shoe horned a zz572 620HP crate engine in his 64 Chevelle. Timing set at the recommended 8* at idle in the manual. That thing idled very nice. 9.5:1 compression engine. There was no such thing as a lack of torque in that engine. In that little chevelle with a TH400 and a tight converter and some drag radials, it was a monster, and a hoot to drive.
08-25-2016, 10:00 PM
#7
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Agree, much more then a target HP and RPM number...
It might technically "peak" there. But,
Full Force had a custom 680 lift, 241/246 hyd roller in his 540 with afr partially cnc heads, single plane intake, 1050 carb, and technically, his setup "peaked" at 5900. However, at 5300 it was making 623HP. At 5900, 628HP. Only a 6hp gain over a 600RPM spread in the upper rpm band? In my opinion, that cam was done at 5300-5400ish. Not much point spinning the engine faster than about 5300-5400.
Another buddy built a NA 572 combo, with a cam supplied by a different custom cam guy..Also around 680 lift. This cam "peaked at 6100. At 5300RPM, it was making 721HP, at 5900, it was making 760HP. 600RPM spread, picked up another 40hp.
My point? IMO, peak numbers aren't the end all deciding factor on how well the cam performs.
Full Force had a custom 680 lift, 241/246 hyd roller in his 540 with afr partially cnc heads, single plane intake, 1050 carb, and technically, his setup "peaked" at 5900. However, at 5300 it was making 623HP. At 5900, 628HP. Only a 6hp gain over a 600RPM spread in the upper rpm band? In my opinion, that cam was done at 5300-5400ish. Not much point spinning the engine faster than about 5300-5400.
Another buddy built a NA 572 combo, with a cam supplied by a different custom cam guy..Also around 680 lift. This cam "peaked at 6100. At 5300RPM, it was making 721HP, at 5900, it was making 760HP. 600RPM spread, picked up another 40hp.
My point? IMO, peak numbers aren't the end all deciding factor on how well the cam performs.
08-26-2016, 06:06 PM
#8
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I have a Crane, Lunati, Howards, Erson, Comp cams catalogs here. Nothing "off the shelf" grind wise with that much lift that I know of or seen, with that short of a duration.
Crane's shortest duration bbc cam, with .680 lift, off the shelf, is
#139791
246/254 114 LSA .680/.680 lift.
Crane's shortest duration bbc cam, with .680 lift, off the shelf, is
#139791
246/254 114 LSA .680/.680 lift.
