What's considered "high lift" on a blower cam these days?
06-30-2015, 05:10 PM
#1
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What's considered "high lift" on a blower cam these days? What's considered "high lift" on a blower cam these days?
I have a built 365ci w/ lightly ported LSA heads, stock rockers, LS7 lifters, Tooley .660 platinum spring kit and am shopping for a bigger cam to handle the air volume on my F1X. I spin the motor to ~7,300
I got the 2 specs below from 2 different cam guys:
238/259 .643/.632 115+5
QXX intake lobe
HUC exhaust lobe
and
240/258 .615/.615 116+5
XTRM intake lobe
LXL exhaust lobe
The .643/.632 lift cam seemed like lots of lift to me, but wasn't sure what was normal these days. I'm worried about the typical stuff... valve wipe, valve guide longevity, spring longevity.
I'm currently running 230/242 608/.615 115+4
I have a built 365ci w/ lightly ported LSA heads, stock rockers, LS7 lifters, Tooley .660 platinum spring kit and am shopping for a bigger cam to handle the air volume on my F1X. I spin the motor to ~7,300
I got the 2 specs below from 2 different cam guys:
238/259 .643/.632 115+5
QXX intake lobe
HUC exhaust lobe
and
240/258 .615/.615 116+5
XTRM intake lobe
LXL exhaust lobe
The .643/.632 lift cam seemed like lots of lift to me, but wasn't sure what was normal these days. I'm worried about the typical stuff... valve wipe, valve guide longevity, spring longevity.
I'm currently running 230/242 608/.615 115+4
07-01-2015, 09:26 AM
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07-01-2015, 05:06 PM
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Biggest question that needs asked. Is what do your heads flow and do they warrant such lift ?
There is no sense opening the valve further and further just for the sake of it, it would be easier on the valvetrain to hold the valve open for longer at a lower lift than to extract the max lift possible pushing valvetrain harder for no gains in airflow.
There is no sense opening the valve further and further just for the sake of it, it would be easier on the valvetrain to hold the valve open for longer at a lower lift than to extract the max lift possible pushing valvetrain harder for no gains in airflow.
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07-01-2015, 06:29 PM
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Biggest question that needs asked. Is what do your heads flow and do they warrant such lift ?
There is no sense opening the valve further and further just for the sake of it, it would be easier on the valvetrain to hold the valve open for longer at a lower lift than to extract the max lift possible pushing valvetrain harder for no gains in airflow.
There is no sense opening the valve further and further just for the sake of it, it would be easier on the valvetrain to hold the valve open for longer at a lower lift than to extract the max lift possible pushing valvetrain harder for no gains in airflow.
07-01-2015, 06:37 PM
#9
I was running 244/254 .578/.578 114 LSA in my supercharged setup. It was an awesome cam (I have it for sale if anyone is interested).
I think that the bigger cams in general are worse for turbo setups. That cam worked just amazing for when I was supercharged. And it sounded amazing too.
I think that the bigger cams in general are worse for turbo setups. That cam worked just amazing for when I was supercharged. And it sounded amazing too.
07-02-2015, 06:34 AM
#10
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07-02-2015, 08:04 AM
#11
The cam in my turbo motor is .664/.640, QXI/QXX. My heads are still picking up around 20 cfm from .600-.700. Of course it's not a big concern with FI to have an aggressive cam, you can make the power without it. But as long as you can keep everything in control, it's not going to hurt either. Mine is a hydraulic roller and spins 8400 at 20psi so far with no problem, so it works pretty well!
