Camshafts for Evo red... idle, revlimit, power
Evolving Member
Joined: Jun 2005
Posts: 259
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From: McKinney TX
Just because the flow bench says flow goes flat above xxx lift doesn't mean power will not increase with more lift. If it goes super-turbulent and backs up THEN you might have a problem.
Think in 2 stroke terms such as Time Area or Time Angle.
NHRA SS records alone should prove this, broken several times every year on puny valves and ports that have lots of time into them. They go WELL above the stall lift.
Think in 2 stroke terms such as Time Area or Time Angle.
NHRA SS records alone should prove this, broken several times every year on puny valves and ports that have lots of time into them. They go WELL above the stall lift.
Last edited by GrocMax; Aug 17, 2008 at 09:30 PM.
Just because the flow bench says flow goes flat above xxx lift doesn't mean power will not increase with more lift. If it goes super-turbulent and backs up THEN you might have a problem.
Think in 2 stroke terms such as Time Area or Time Angle.
NHRA SS records alone should prove this, broken several times every year on puny valves and ports that have lots of time into them. They go WELL above the stall lift.
Think in 2 stroke terms such as Time Area or Time Angle.
NHRA SS records alone should prove this, broken several times every year on puny valves and ports that have lots of time into them. They go WELL above the stall lift.
I mean, I can understand it but I was a liberal arts major, not no engineer with fancy phrases like stall lift
At this point, that would be conjecture. Regardless, a competently ported head comfortably outflows a factory head at all lift ranges, especially high lift ranges.
HKS 280s are fine with a factory head and valvetrain, and that's about it. They are outclassed by offerings with better ramp rates, such as the cams we are discussing here. But then again none of the cams we are discussing here should be used with the factory valvetrain, period.
I'm still running HKS 280s, but I've been thinking about swapping them for something a little bit bigger, esp. now that I have a ported head ... I'm just not sure how much more I can squeeze out of my 50 trim.
l8r)
LOL
The only reason why I kept HKS cams in my head is because there was no sense in changing them until I upgraded the head.
HKS cams are designed to improve power with a factory head and valvetrain, without compromising reliability. They achieve exactly that, and cannot be faulted. However, there is no sense in using any HKS cam set with a ported head and upgraded valvetrain. The turbo will spool quicker and the engine will make more power with a more aggressive cam set.
The only reason why I kept HKS cams in my head is because there was no sense in changing them until I upgraded the head.
HKS cams are designed to improve power with a factory head and valvetrain, without compromising reliability. They achieve exactly that, and cannot be faulted. However, there is no sense in using any HKS cam set with a ported head and upgraded valvetrain. The turbo will spool quicker and the engine will make more power with a more aggressive cam set.
I've been thinking about going with a set of Kelford 272s. I'm not sure that going much more aggressive than that would pay off on a car that sees mostly street and road course use. Then again, I do have a block that can be revved well past where the 50 trim will reasonably hold up, so something like a set of GSC S3's or Kelford 280s would be very tempting to try. Might be too much cam for the smaller turbo, but should work that much better with something like an HTA 35R. Choices, choices...
l8r)
l8r)
Size the cams for the turbo, and resist the temptation to use more duration than you really need. It will only hurt you on the low side of things, which tends to be counterproductive for anything driven on the street.
They actually are not that similar. we doctored both the Jun 272 and the BR 272..
Greg
we didn't test either of them.. we just cam doctored them to check the spec for the customers that set them to us..
the S3 can be used on a smaller turbo than the 42r.. just needs to be on a top end power car. the S3 set i would run on a 67mm turbo car that is a drag car or a larger turbo. pretty much needs to be on a ported head and will really work well in the 5500-9000 rpm range. then again..
the S3 can be used on a smaller turbo than the 42r.. just needs to be on a top end power car. the S3 set i would run on a 67mm turbo car that is a drag car or a larger turbo. pretty much needs to be on a ported head and will really work well in the 5500-9000 rpm range. then again..
...the S3 can be used on a smaller turbo than the 42r.. just needs to be on a top end power car. the S3 set i would run on a 67mm turbo car that is a drag car or a larger turbo. pretty much needs to be on a ported head and will really work well in the 5500-9000 rpm range. then again..
... so the real question is - if my 50 trim is already maxed out past 7500 RPM, would the S3 gain me any top end versus the HKS 280s I have right now? ... or does the turbo ultimately limit the potential gains from the bigger cam?
l8r)
Hehe, that's the range my 50 trim operates in most of the time...
... so the real question is - if my 50 trim is already maxed out past 7500 RPM, would the S3 gain me any top end versus the HKS 280s I have right now? ... or does the turbo ultimately limit the potential gains from the bigger cam?
l8r)
... so the real question is - if my 50 trim is already maxed out past 7500 RPM, would the S3 gain me any top end versus the HKS 280s I have right now? ... or does the turbo ultimately limit the potential gains from the bigger cam?
l8r)
cb
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