comp cams techline sux. got a quick question
comp cams techline sux. got a quick question been trying to call comp cams tech service for about a week each time im told ill be holding for about 45 min. im tired of calling them for such a simple question.
i just bought a 396 lt4 with a custom comp cam 236/244 .585/.580 112. it has 1.5 rr on it. i want to switch to 1.6 rr. iv been told that depending on the ramp speed on the lobe, i could start breaking rockers. i dont think that sounds right but wanted to find out for sure before i find out the hard way.
also, those cam specs are with a 1.5. what would they be with a 1.6?
i just bought a 396 lt4 with a custom comp cam 236/244 .585/.580 112. it has 1.5 rr on it. i want to switch to 1.6 rr. iv been told that depending on the ramp speed on the lobe, i could start breaking rockers. i dont think that sounds right but wanted to find out for sure before i find out the hard way.
also, those cam specs are with a 1.5. what would they be with a 1.6?
been trying to call comp cams tech service for about a week each time im told ill be holding for about 45 min. im tired of calling them for such a simple question.
i just bought a 396 lt4 with a custom comp cam 236/244 .585/.580 112. it has 1.5 rr on it. i want to switch to 1.6 rr. iv been told that depending on the ramp speed on the lobe, i could start breaking rockers. i dont think that sounds right but wanted to find out for sure before i find out the hard way.
also, those cam specs are with a 1.5. what would they be with a 1.6?
i just bought a 396 lt4 with a custom comp cam 236/244 .585/.580 112. it has 1.5 rr on it. i want to switch to 1.6 rr. iv been told that depending on the ramp speed on the lobe, i could start breaking rockers. i dont think that sounds right but wanted to find out for sure before i find out the hard way.
also, those cam specs are with a 1.5. what would they be with a 1.6?
Never heard of a broken rocker because the lobes were too steep...
been trying to call comp cams tech service for about a week each time im told ill be holding for about 45 min. im tired of calling them for such a simple question.
i just bought a 396 lt4 with a custom comp cam 236/244 .585/.580 112. it has 1.5 rr on it. i want to switch to 1.6 rr. iv been told that depending on the ramp speed on the lobe, i could start breaking rockers. i dont think that sounds right but wanted to find out for sure before i find out the hard way.
also, those cam specs are with a 1.5. what would they be with a 1.6?
i just bought a 396 lt4 with a custom comp cam 236/244 .585/.580 112. it has 1.5 rr on it. i want to switch to 1.6 rr. iv been told that depending on the ramp speed on the lobe, i could start breaking rockers. i dont think that sounds right but wanted to find out for sure before i find out the hard way.
also, those cam specs are with a 1.5. what would they be with a 1.6?
.624 is a lot of lift for a street car, and may not even benefit you if the heads stop flowing at .600.
Honestly I would leave the 1.5rr's on unless you have killer heads. Depending on the lobes used you could eat up springs or encounter valve float at high rpms with the 1.6rr's.
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well i just bought the motor and im just trying to put it in right now. i was just trying to see if i could squeeze some more power out of the motor for a little extra cash
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Changing the rockers won't hurt a thing, and should help (even if your heads "stop flowing at .600"), but you do need to make sure your springs won't bind, and the retainers won't hit your valve seals or guides. I run 1.8 rockers on some of Comp's most aggressive solid roller lobes with no issues. If your head's flow numbers stop going up at .600", they will still spend more time in the peak flow range.
Good luck, Ed
Good luck, Ed
that sounds pretty good. guess ill call afr on monday to get some more info on the springs.
and for the record, i never believed it would hurt anything. i just wanted to be sure. i have never heard of that happening
and for the record, i never believed it would hurt anything. i just wanted to be sure. i have never heard of that happening
May not be an issue in your case depending on the aggressiveness of the lobes on that comp cam, but on a daily driven Hydraulic Roller car, depending on the ramp speed, you can damage springs or make the valves too hard to control high in the rpms by changing the rocker ratio above what it was specced for.
The lift won't be the only thing that increases, everything happens faster so spring requirements will go up. On an HR you cannot run crazy high spring pressures like you can on a solid roller setup to keep the valves in check(or else you'd crush the hyd lifter), and you will need very good quality springs to survive a lot of street duty with over .6 lift and an aggressive lobe.
It can be done of course, but on an HR setup you have to be very careful of your spring choice and check the ramp rate of the lobe being used.
I still do not think the change from 1.5's to 1.6s would warrant the possible purchase of new springs and rockers. For less money then a high end set of springs and some roller rockers would cost you can have a new cam ground for the 1.5rrs you already have, and accomplish more for less.
The lift won't be the only thing that increases, everything happens faster so spring requirements will go up. On an HR you cannot run crazy high spring pressures like you can on a solid roller setup to keep the valves in check(or else you'd crush the hyd lifter), and you will need very good quality springs to survive a lot of street duty with over .6 lift and an aggressive lobe.
It can be done of course, but on an HR setup you have to be very careful of your spring choice and check the ramp rate of the lobe being used.
I still do not think the change from 1.5's to 1.6s would warrant the possible purchase of new springs and rockers. For less money then a high end set of springs and some roller rockers would cost you can have a new cam ground for the 1.5rrs you already have, and accomplish more for less.
I'm with Puck.
I'd be very surprised if you gained anything at all going to 1.6's at this point; certainly not worth the expense of making sure it works without damaging something.
Whether your cam is the old Magnum lobes or the XE lobes, your cam/lift/duration is not holding you back at this point.
Wait until the plans for AI heads pan out; THEN optimize your cam/rockers'
Edit: Oh, and don't count on any worthwhile info from Comp's "tech" line unless you happen to know one of the 2 or 3 people there who are actually qualified to disseminate that kind of information. Comp has great products, but you'd better know what you want BEFORE calling them!
I'd be very surprised if you gained anything at all going to 1.6's at this point; certainly not worth the expense of making sure it works without damaging something.
Whether your cam is the old Magnum lobes or the XE lobes, your cam/lift/duration is not holding you back at this point.
Wait until the plans for AI heads pan out; THEN optimize your cam/rockers'
Edit: Oh, and don't count on any worthwhile info from Comp's "tech" line unless you happen to know one of the 2 or 3 people there who are actually qualified to disseminate that kind of information. Comp has great products, but you'd better know what you want BEFORE calling them!
Last edited by bowtienut; Mar 14, 2010 at 07:57 AM.
if i have to change springs or switch to a solid lifter i probably wont bother, but if the springs will stand up to the new pressure and the rockers are the only think i have to change, i probably will. kinda want to try out the new ultra pro magnums
why not step to a "shaft mount" style like the yella terra setup if you're planning on upgrading rockers? Only a few bucks more...
Intake is an XE lobe, not sure on the exhaust. run the 1.6s if the springs can handle it, otherwise throw some 1518s in there and you'll be fine.
Intake is an XE lobe, not sure on the exhaust. run the 1.6s if the springs can handle it, otherwise throw some 1518s in there and you'll be fine.
Last edited by Wicked94Z; Mar 14, 2010 at 05:32 PM.
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From: Kempner, TX
I'm with Puck.
I'd be very surprised if you gained anything at all going to 1.6's at this point; certainly not worth the expense of making sure it works without damaging something.
Whether your cam is the old Magnum lobes or the XE lobes, your cam/lift/duration is not holding you back at this point.
Wait until the plans for AI heads pan out; THEN optimize your cam/rockers'
Edit: Oh, and don't count on any worthwhile info from Comp's "tech" line unless you happen to know one of the 2 or 3 people there who are actually qualified to disseminate that kind of information. Comp has great products, but you'd better know what you want BEFORE calling them!
I'd be very surprised if you gained anything at all going to 1.6's at this point; certainly not worth the expense of making sure it works without damaging something.
Whether your cam is the old Magnum lobes or the XE lobes, your cam/lift/duration is not holding you back at this point.
Wait until the plans for AI heads pan out; THEN optimize your cam/rockers'
Edit: Oh, and don't count on any worthwhile info from Comp's "tech" line unless you happen to know one of the 2 or 3 people there who are actually qualified to disseminate that kind of information. Comp has great products, but you'd better know what you want BEFORE calling them!
