Cams Around .632 Lift
02-27-2005, 02:51 AM
#4
if you are wanting to put that cam in your 6.0 motor w/ 6.0 heads, i'd say dont even think about it. why do you want to run the 1.85 SLP rockers anyway? sure they will hang that valve about a mile outa the head, but unfortunatly for you, the piston wont be at least 1.00001 miles away at this point in time 
camshaft lift isnt everything my friend, i've heard all the talk at the dirt track too lol
redneck1- "that thangs gotta .750 lift cam in it!"
redneck2- "i bet it'll go around the moon wiff enough carburrtrator on it!"
the thunder racing t-rex isnt close to that size, and its a MONSTER! keep on researching, reading, and learning. check out JRP's signature, he's got a nice cam guide writeup in there.
camshaft lift isnt everything my friend, i've heard all the talk at the dirt track too lol
redneck1- "that thangs gotta .750 lift cam in it!"
redneck2- "i bet it'll go around the moon wiff enough carburrtrator on it!"
the thunder racing t-rex isnt close to that size, and its a MONSTER! keep on researching, reading, and learning. check out JRP's signature, he's got a nice cam guide writeup in there.
02-27-2005, 08:59 AM
#5
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Originally Posted by 1fstGM
What set up are you guys running this cam on? Are there any modifications to be done as far as clearance?
(provided you are talking lifts at .050).
02-27-2005, 07:38 PM
#7
By and large, the people on this forum seem to be running .580-.600 peak lift hydraulic rollers. The vary widely in duration though, with some posts indicatiing people are pushing the drivability limits...especially with stock displacements.
When you go to higher lifts you need to be careful about piston to valve clearence. You will need to check. Probably need to flycut. And may need different pistons if the flycutting would be excessive.
You will need springs that can handle it, which you may or may not already have. The faster ramp and greater motion will also cause the springs to wear out quicker, requiring changes.
Most of the LS1 heads have reached 80% of their peak flow by .4", and don't gain flow above .6". So, unless the larger lift is allowing greater duration at .200" lobe lift (for the same .050" lobe lift number), it isn't really buying you much.
David
When you go to higher lifts you need to be careful about piston to valve clearence. You will need to check. Probably need to flycut. And may need different pistons if the flycutting would be excessive.
You will need springs that can handle it, which you may or may not already have. The faster ramp and greater motion will also cause the springs to wear out quicker, requiring changes.
Most of the LS1 heads have reached 80% of their peak flow by .4", and don't gain flow above .6". So, unless the larger lift is allowing greater duration at .200" lobe lift (for the same .050" lobe lift number), it isn't really buying you much.
David
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02-27-2005, 08:54 PM
#8
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Originally Posted by 1fstGM
What set up are you guys running this cam on? Are there any modifications to be done as far as clearance?
My cam is just under .632 at.050. what is the Lsa, and the duration ,intake and exhaust at.050. my cam is cut at a very wide LSA and it fits very close with about 60 on intake and 90 on exhaust. There are a lot of factors that play a role in clearancing the cam so let me know the specs and i can check it out for you.
02-28-2005, 12:20 AM
#9
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The LSA is 112 and the duration is 250/256 at .050. Can't I just turn the crank manually to see if the valve will clear the piston? The pistons are diamond and have a -2cc valve relief. The heads were flowing around 319 @ .600 just FYI. Thanks.
02-28-2005, 12:08 PM
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Originally Posted by TheBlurLS1
i dont think the duration on the cam is going to be magnified like that by the 1.85 rockers. post up the actual cam specs (like they show you with 1.7 rockers) like you did in the other thread ya started
Lift has no affect on PTV. Duration, cam timing, lobe type, and LSA, among other things, however, do affect PTV. Remember, more LSA = more PTV. You could put a 1.000" cam into your stock LS1 and have no PTV issues. Not saying that stuff exists, but it's a good example.
More lift isn't always going to make more power, but it rarely hurts power. But to answer the original question, .632 lift is do-able on a hydraulic roller setup.
Last edited by KingCrapBox; 02-28-2005 at 12:13 PM.
02-28-2005, 04:58 PM
#13
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Yup,
Some of these bigger or big block heads keep increasing in flow all the
way up to 1" of lift. Damn that is big...
Another thing is just because flow drops a couple of CFM at the next .1" increment of lift doesnt mean you are going to lose power.
You gain power from lifting out that far because you hit every flow point earlier than you would if you didnt. Getting lift fast is important on the intake side of things.
Dennis
Some of these bigger or big block heads keep increasing in flow all the
way up to 1" of lift. Damn that is big...
Another thing is just because flow drops a couple of CFM at the next .1" increment of lift doesnt mean you are going to lose power.
You gain power from lifting out that far because you hit every flow point earlier than you would if you didnt. Getting lift fast is important on the intake side of things.
Dennis
03-02-2005, 08:00 AM
#18
Originally Posted by PREDATOR-Z
Rayz, why didn't you choose more exhaust lift split? I thought that would be better for nitrous?
