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IPD 'Street Performance Cam Kit'

dl242gt said:
You will make more power with the IPD turbo cam. The overall setup of the cam is only one degree more overlap at 110 than the n/a V15. It's almost an N/A cam. Compared to the V15T which has 112 degrees. I'm pretty sure even an n/a version V15 would work well in a turbo engine as the 109 degree overlap isn't a lot.
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So I am a bit confused here. If we are talking overlap it must be in relation to duration. Going by these cam measurements and not the advertised https://www.redblockpowered.com/camspecs, we get the following for overlap (using the 0.050" duration, 1mm duration overlap numbers in parentheses).

M: -9 (-2.5)
T: -8 (-2.5)
A: 11.5 (17.50)
B: 15.5 (23)
K: 18 (24)
H: 26 (31)
V: 10 (15.5)
VX: 6.5 (12.5)
V15 N/A: 12.5 (19)
V15T: 5 (11.5)
IPD Turbo: 5 (11.5)

So the turbo and V15T based on measuring the cams themselves have the same overlap. The V15 N/A is somewhere between the A and B. Granted, between the VX and IPD turbo with only 1-1.5 degrees duration difference and the approximate 0.5mm more lift, the IPD turbo seems like a superior choice for even NA among IPD's offerings. To be honest it is probably emissions testing requirements that keep them from selling clones of anything more aggressive in terms of duration and overlap for NA.
 
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Going by the 720 degrees of the cam operation The overlap spec is how many degrees separates the intake and exhaust valve action. So a cam with higher overlap number like a V15T has the valve action further away from each other than say the V15 n/a cam at 109 degrees. The lower the number the higher the overlap. So a hotter cam will have less numerical overlap degrees.

I've used both of those cams and can tell you the difference is there. The n/a version is more a bit more lumpy at idle than the turbo cam version. They are both mild cams designed for street use and emissions friendly.

On the box for my V16T there is a description of each spec. Spec C and D are the Lobe center which is the overlap of intake and exhaust. The intake has 110 and exhaust has 114. C is ATC and D is BTC
 
dl242gt said:
Going by the 720 degrees of the cam operation The overlap spec is how many degrees separates the intake and exhaust valve action. So a cam with higher overlap number like a V15T has the valve action further away from each other than say the V15 n/a cam at 109 degrees. The lower the number the higher the overlap. So a hotter cam will have less numerical overlap degrees.

I've used both of those cams and can tell you the difference is there. The n/a version is more a bit more lumpy at idle than the turbo cam version. They are both mild cams designed for street use and emissions friendly.

On the box for my V16T there is a description of each spec. Spec C and D are the Lobe center which is the overlap of intake and exhaust. The intake has 110 and exhaust has 114. C is ATC and D is BTC
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I think you are mixing up lobe separation angle and overlap. The "109 degrees" number isn't overlap, that is the lobe separation angle. The smaller the lobe separation angle, assuming the same duration, the more overlap. Now if we have longer duration but the same LSA, we will also have more overlap.

I think the big question is, with an IPD turbo in an NA application you are giving up some high end with the lower overlap, but how much is the extra lift versus a VX getting you, or will the cam perform similarly lackluster in an NA application without the overlap? Is the combo of higher lift and less overlap gonna get you a well rounded cam in a B21 (assuming op's car has that engine).
 
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I'm not mixed up but I explained it in a manner that someone else might not understand. Sorry I do that sometimes. I understand both specs which are directly related. They are kind of like inverse relationship. the lower the number the more overlap which is also what I was trying to say. I got schooled about this stuff a long time ago by stealthfti so I understand the information just may not communicate it that well. I can say I sure like how their cams made my engines run. No longer a tractor. lol
 
dl242gt said:
I'm not mixed up but I explained it in a manner that someone else might not understand. Sorry I do that sometimes. I understand both specs which are directly related. They are kind of like inverse relationship. the lower the number the more overlap which is also what I was trying to say. I got schooled about this stuff a long time ago by stealthfti so I understand the information just may not communicate it that well. I can say I sure like how their cams made my engines run. No longer a tractor. lol
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www.enginelabs.com

TECH QUICKIE: Camshaft Lobe Separation Angle And Power Relationship

Erson Cams, Doug Patton of Pro Line Race Engines, and Chuck Lawrence of Jon Kaase Racing Engines cover talking points on a camshaft's lobe separation angle.
www.enginelabs.com www.enginelabs.com
 
dl242gt said:
I'm not mixed up but I explained it in a manner that someone else might not understand. Sorry I do that sometimes. I understand both specs which are directly related. They are kind of like inverse relationship. the lower the number the more overlap which is also what I was trying to say. I got schooled about this stuff a long time ago by stealthfti so I understand the information just may not communicate it that well. I can say I sure like how their cams made my engines run. No longer a tractor. lol
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I had a v15 NA in a previous car and it was great.

An outstanding question I guess as far as lift goes, is will the head flow enough to keep up with the cam without boost pressure or the "suction" from the exhaust provided by overlap to help fill the cylinder? Probably an effect so small you wouldn't feel it though until you are really revving it out.
 
dl242gt said:
I'm not mixed up but I explained it in a manner that someone else might not understand. Sorry I do that sometimes. I understand both specs which are directly related. They are kind of like inverse relationship. the lower the number the more overlap which is also what I was trying to say. I got schooled about this stuff a long time ago by stealthfti so I understand the information just may not communicate it that well. I can say I sure like how their cams made my engines run. No longer a tractor. lol
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Enem's cams?
 
dl242gt said:
Yes, a great investment for your redblock.
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Not wishing to hijack the thread here, but in TB tradition and if wer'e on the subject :-P ...

I was really considering the 15 NA for my 91 with my next Timing Belt service but Mikep posted how he liked the A and considering the expense I was leaning towards the A (or V if I found one).

So you're saying theyre worth it.

And will it raise my top speed? I couldn't get my wagon over 95. (closed course).
 
Yes, they are worth it but I am biased having used both turbo and n/a versions of the V15 and liking them a lot. They are also the kind of cam that will support mods further down the lane. You won't run out of cam.

Yes, it will increase your top speed. You can actually pass on the highway. In my 93 LH2.4 car the only other mod besides the cam was a chipped EZK box.

If you are more budget oriented and only need a small improvement the A or B cams in a B230 car are a very good choice. The M is just too conservative, the T is an improvement in an automatic car as well.
 
DD Ranch said:
Not wishing to hijack the thread here, but in TB tradition and if wer'e on the subject :-P ...

I was really considering the 15 NA for my 91 with my next Timing Belt service but Mikep posted how he liked the A and considering the expense I was leaning towards the A (or V if I found one).

So you're saying theyre worth it.

And will it raise my top speed? I couldn't get my wagon over 95. (closed course).
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What trans are you running? I've had my 83 242 with and auto over 100, and our 90 245 with a m47 consistently hits 100 (gotta love I-5 north from LA to Tracy at 3am). To me it sounds like something else, unless your closed course is a track without a long straight.
 
Pietercc said:
What trans are you running? I've had my 83 242 with and auto over 100, and our 90 245 with a m47 consistently hits 100 (gotta love I-5 north from LA to Tracy at 3am). To me it sounds like something else, unless your closed course is a track without a long straight.
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"Closed course" ;-);-)

But yeah, AW70. So, ?
 
Mcloud said:
Will turbo cam work with my stock valvetrain?
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Yes, it'll work fine with your valve train. Are you doing the cam change yourself, or having it done? If you're doing it yourself, check your valve lash. You may, or may not need to change a/some puck(s)/shim(s).
 
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