Pick Blower Cams For My Setup.. I Know I Know But I Searched

[mustangman9812]

Pick me a set of Blower Cams that will benefit me the best on my build. Also would Steel Retainers benefit me any?

Mods are:
GT Crank, Ace Forged I-Beam Rods, Manley Pistons, Ported NPI Heads, Comp Springs, Flowtech L/T's, PI Intake, Accufab Plenum & 75mm Throttle Body, Procharger P1SC

I was thinking -
Hitech Ford 4.6 / 5.4 2V Blower Stage 2 Camshafts
$599.00
Specs: 234/230 duration, 112 lobe sep, .550/.500 lift

Slight lope at idle, MAJOR gains in power over stock cams. Recommend built short block and upgraded valve springs to handle the extra power and RPM capabilities of this cam.

Power: 2300 - 6500+ rpm


This isnt together yet but I have all parts just down to getting the cams, and please I have trans and rearend mods so please just stay on topic lol. You tell me I buy, thanks stangnet!

Thanks,
Matt

 

[mustangman9812]

Ok well I guess I go with Hitech, do I need offset retainers?

 

[98COBRA281]

hitech's have great N/A cams, so im sure there blower cams are good to...

i hope my cams are good for nitrous

 

[CobraRed_96_GT]

So since peeps are making good numbers on 2V's N/A that means they have good blower cams? I compare grinds, not brands. I'd go with someone you can look up results and hear on youtube - enough people have bought to have feedback on.

$599 seems high, are Hitechs regrinds?

 

[98COBRA281]

So since peeps are making good numbers on 2V's N/A that means they have good blower cams? I compare grinds, not brands. I'd go with someone you can look up results and hear on youtube - enough people have bought to have feedback on.

$599 seems high, are Hitechs regrinds?

well i figured if there n/a cams a good, more then likely so are their blower cams, and hitech are NOT regrinds...

 

[TGJ]

I like HiTech N/A cams, but I completely disagree with them on their SC cam grind. You should be looking for a cam that favours the exhaust( duration and lift ) and have an LSA of around 114 if you are using a supercharger.

 

[CobraRed_96_GT]

I like HiTech N/A cams, but I completely disagree with them on their SC cam grind. You should be looking for a cam that favours the exhaust( duration and lift ) and have an LSA of around 114 if you are using a supercharger.

Wow, i agree with TGJ
And I wasn't saying HiTechs were regrinds, i've just never seen a pic of em. Still $599 is a lot to ask for a cam set-up maybe a handful of people have.

 

[Poisoned Pony]

I heard alot of S/C guys getting good numbers off MPH blower cams and VT Stage 2's, might want to look at those

 

[CobraRed_96_GT]

I heard alot of S/C guys getting good numbers off MPH blower cams and VT Stage 2's, might want to look at those

I hear the same, i forget but think the stage 2.5 VT is good for centri and stage II for PD blowers.

 

[mustangman9812]

hitech's have great N/A cams, so im sure there blower cams are good to...

i hope my cams are good for nitrous

They will be lol

So I will look at MPH or VT well I guess Cushman now

One more question - Do I need Offset Retainers with the NPI Heads?

Thanks All For Comments!

 

[CobraRed_96_GT]

Hmm, stage II PI cams on NPI heads, i know you need to do something about the lift.

 

[96SCstang]

you CANNOT run stage 2 pi cams on npi heads unless you get the valve seat machined down a little bit. you will get massive coil bind and mess up you heads, valves, piston, ect. if i were you i would look into the crower npi cams if you wanna stay with npi heads. that is what i am doing. i have actually been talking to emerson at last call racing about these cams and he loves em. he has the stage 2 cam in his 96 gt with npi heads. they also make a stage 3 that is almost identical to the pi stage 2 cam just with a little less lift. that is the route i would take. you will still need to do springs but you wont have coil bind problems. i would give emerson a call and talk with him about your plans. he is very knowledgable and will steer you in the right direction.

 

[TGJ]

you CANNOT run stage 2 pi cams on npi heads unless you get the valve seat machined down a little bit. you will get massive coil bind and mess up you heads, valves, piston, ect. if i were you i would look into the crower npi cams if you wanna stay with npi heads. that is what i am doing. i have actually been talking to emerson at last call racing about these cams and he loves em. he has the stage 2 cam in his 96 gt with npi heads. they also make a stage 3 that is almost identical to the pi stage 2 cam just with a little less lift. that is the route i would take. you will still need to do springs but you wont have coil bind problems. i would give emerson a call and talk with him about your plans. he is very knowledgable and will steer you in the right direction.

Having the valve seat machined is one way of getting the NPI & SVO heads to run larger lift cams. My P&P NPI heads did not have the valve seats machined and I don't have any issues running a large cam. I am running Crower Stage 2 PI SC cams that are .581 lift, mine were actually .588 when they were degreed in. I am not giving my engine builder's secret on how he did it but it is a lot easier with his method than maching the valve seat pockets.

It really depends on whose Stage 2 cam you want to run. Some companies Modular 2V cams do not exceed .550 lift. You can run upto .550 lift without coil bind on NPI heads using Crower Offset retainers. I have heard of some running .550 lift cams without the offset retainers, however if it was me, I would use them.

 

[Midnight2V]

They are a little more expensive, but Comp Cams makes a cam specifically for a street driven, NPI, centrifugal setup. It is their 268h set. TJG nailed it on the head when he said you need to favor the exhaust side on a supercharged setup as well as a higher LSA. These bumpsticks have the following numbers.

Valve lift - .500" intake and exhaust
duration @ 0.050 230* intake, 236* exhaust
lobe separation angle 114.

If you are going to change heads at some point...suck it up and wait on cams until you get new heads and match the cam to your final setup.

If these are the heads you intend to keep on your mill then I would recommend these cams for coil bind issues. Yes you already have the comp springs...but because of the distance between the retainer and the spring seat on your heads, your springs are already slightly compressed even with the valve fully closed. Just because your springs can support .600 of valve lift doesn't mean your setup (as it is) won't grenade your valvetrain. Peak lift is not nearly as important as average lift throughout the valve cycle. This is where ramp rate (how much the valve lift changes per unit of cam rotation) is incredibly important. Comp cams have great ramp rates. Also, these heads do not really respond much beyond
.500" of lift on either the intake or (especially) exhaust unless you sacrifice flow velocity through additional porting.

Also, the duration on this set is not terribly aggressive. Those NPI heads when ported out will absolutely kill low end torque. Peak flow numbers can be good but flow velocity is atrocious. Keeping your duration relatively conservative will help tremendously ( Check out how the PI cam makes so much more torque than the NPI cam using LESS duration, more lift, and a higher ramp rate!)

The LSA being 114 vice 112 will prevent you from blowing your intake charge right out the exhaust. Na motors use lots of overlap to promote exhaust scavenging which in turn helps draw the intake charge into the cylinder. On a supercharged setup, or to an even higher degree on a turbo mill, the compressor is doing this work for you. Excessive overlap will quickly reach a point of diminishing returns on a forced induction application.

Hope this helps

 

[mustangman9812]

They are a little more expensive, but Comp Cams makes a cam specifically for a street driven, NPI, centrifugal setup. It is their 268h set. TJG nailed it on the head when he said you need to favor the exhaust side on a supercharged setup as well as a higher LSA. These bumpsticks have the following numbers.

Valve lift - .500" intake and exhaust
duration @ 0.050 230* intake, 236* exhaust
lobe separation angle 114.

If you are going to change heads at some point...suck it up and wait on cams until you get new heads and match the cam to your final setup.

If these are the heads you intend to keep on your mill then I would recommend these cams for coil bind issues. Yes you already have the comp springs...but because of the distance between the retainer and the spring seat on your heads, your springs are already slightly compressed even with the valve fully closed. Just because your springs can support .600 of valve lift doesn't mean your setup (as it is) won't grenade your valvetrain. Peak lift is not nearly as important as average lift throughout the valve cycle. This is where ramp rate (how much the valve lift changes per unit of cam rotation) is incredibly important. Comp cams have great ramp rates. Also, these heads do not really respond much beyond
.500" of lift on either the intake or (especially) exhaust unless you sacrifice flow velocity through additional porting.

Also, the duration on this set is not terribly aggressive. Those NPI heads when ported out will absolutely kill low end torque. Peak flow numbers can be good but flow velocity is atrocious. Keeping your duration relatively conservative will help tremendously ( Check out how the PI cam makes so much more torque than the NPI cam using LESS duration, more lift, and a higher ramp rate!)

The LSA being 114 vice 112 will prevent you from blowing your intake charge right out the exhaust. Na motors use lots of overlap to promote exhaust scavenging which in turn helps draw the intake charge into the cylinder. On a supercharged setup, or to an even higher degree on a turbo mill, the compressor is doing this work for you. Excessive overlap will quickly reach a point of diminishing returns on a forced induction application.

Hope this helps

WOW thanks man!