a cams lift
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TECH Apprentice
Joined: Jul 2002
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From: MS.
a cams lift does a cam have to have higher lift when it has higher duration? would it hurt performance terribly to use (this is just as a reference, it could be any specs you like) 220 220 @ .520 .520 on 114 instead of 220 220 @ .563 .563? what part of the power would that hurt and is there something that would make up for it besides increased rocker ratio (because that is still increasing lift)?
<small>[ February 19, 2003, 05:11 PM: Message edited by: bone camaro ]</small>
<small>[ February 19, 2003, 05:11 PM: Message edited by: bone camaro ]</small>
Thread Starter
TECH Apprentice
Joined: Jul 2002
Posts: 318
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From: MS.
Re: a cams lift I have been doing research and have found that, there is no way to get a perfect mix of sreet and high performance without variable timing. So... Does this mean that the ls1 is to be either racer or streeter (as a natural aspirator)? I hope i am totally wrong. I understand you can get close but, even with all these new cam and head combos there are trade offs. My conclusion as of right now is that i need to go forged and blown. The reason i am posting in this same post of mine is because, I was posting the previous looking for the way out of the tooth rattling but into the high performance end. CORRECT ME IF I AM WRONG.
<img border="0" title="" alt="[Frown]" src="gr_sad.gif" />
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Staging Lane
Joined: Jan 2003
Posts: 97
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From: Pennsylvania
Re: a cams lift I am not too good at this but let me give it a shot. From some experience and what I have read...
Increasing the lift without increasing the duration can yeild more power without changing the power curve much. But usually with increasing the lift also increases the duration some...
Short duration with a wide separation angle might be best for towing, producing a strong, smooth low-end torque curve.
Long duration with a short separation angle might be suited for high-rpm drag racing, with a high-end, sharp torque peak.
Moderate duration with wide separation angle might be best suited for an all-around street performance engine, producing a longer, smoother torque band that can still breathe well at higher RPM.
As far as Lift Duration and LSA you need to know exactly what you want to do first. Having stock heads and putting in a long duration high lift cam will be a waste. You need to match parts. Will your car be mostly street? Do you care about idle? Will you be adding on heads, headers ect....
For street with a basicly stock motor, Keep the duration anywhere to 224 and the lift around 550.. If you care about idle quality keep the LSA 113+.....
The best thing is to contact one of the sponsors and inquire about their H/C packages.. There are some good packages out there at reasonable prices. I think Absolute had a good deal on a H/C package....
It's been a month of research and I still haven't made up my mind yet either... I kind of want best of both worlds...
I know my post is not of much help, but again the best advice is to contact the people who sell the products. The have some good info, know their products and can make some good recomendations.
Increasing the lift without increasing the duration can yeild more power without changing the power curve much. But usually with increasing the lift also increases the duration some...
Short duration with a wide separation angle might be best for towing, producing a strong, smooth low-end torque curve.
Long duration with a short separation angle might be suited for high-rpm drag racing, with a high-end, sharp torque peak.
Moderate duration with wide separation angle might be best suited for an all-around street performance engine, producing a longer, smoother torque band that can still breathe well at higher RPM.
As far as Lift Duration and LSA you need to know exactly what you want to do first. Having stock heads and putting in a long duration high lift cam will be a waste. You need to match parts. Will your car be mostly street? Do you care about idle? Will you be adding on heads, headers ect....
For street with a basicly stock motor, Keep the duration anywhere to 224 and the lift around 550.. If you care about idle quality keep the LSA 113+.....
The best thing is to contact one of the sponsors and inquire about their H/C packages.. There are some good packages out there at reasonable prices. I think Absolute had a good deal on a H/C package....
It's been a month of research and I still haven't made up my mind yet either... I kind of want best of both worlds...
I know my post is not of much help, but again the best advice is to contact the people who sell the products. The have some good info, know their products and can make some good recomendations.
Re: a cams lift </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by bone camaro:
<strong> does a cam have to have higher lift when it has higher duration? would it hurt performance terribly to use (this is just as a reference, it could be any specs you like) 220 220 @ .520 .520 on 114 instead of 220 220 @ .563 .563? </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You're right, you don't have to have high lift just to have long duration. I used to run a cam with a 270 duration and only a .530 lift in a big-block Pontiac 389. For the LS1, you can get a 224 duration with a .533 lift. This is actually a good way to go in some ways because power comes more from duration than lift. Less lift is also easier on the valve train. This was quite common in the "old" days. Most LS1 cams have a lot of lift just because the LS1 can handle it with its roller lifters.
<small>[ February 19, 2003, 10:22 PM: Message edited by: Cal ]</small>
<strong> does a cam have to have higher lift when it has higher duration? would it hurt performance terribly to use (this is just as a reference, it could be any specs you like) 220 220 @ .520 .520 on 114 instead of 220 220 @ .563 .563? </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You're right, you don't have to have high lift just to have long duration. I used to run a cam with a 270 duration and only a .530 lift in a big-block Pontiac 389. For the LS1, you can get a 224 duration with a .533 lift. This is actually a good way to go in some ways because power comes more from duration than lift. Less lift is also easier on the valve train. This was quite common in the "old" days. Most LS1 cams have a lot of lift just because the LS1 can handle it with its roller lifters.
<small>[ February 19, 2003, 10:22 PM: Message edited by: Cal ]</small>
