PI cam swap question

[sn97gtnyg]

ok, so i was just on the phone with someone reputable and they said that the stock NPI springs wont hold the speed of the PI cams and that its do able but it wont be reliable. Is this true? If so how big of a threat is it to the health of my engine.

 

[Jrgunn5150]

Untrue.

 

[reivaxtorres]

'96 - '98 valve springs = exact same as '99-'04 springs. there are no "NPI" or "PI" valve springs



they will hold up just fine. trust me. i had the PI cams in my NPI heads and i think my car saw 6k rpms almost daily. never had an issue with it

 

[justinschmidt1]

ok, so i was just on the phone with someone reputable and they said that the stock NPI springs wont hold the speed of the PI cams and that its do able but it wont be reliable. Is this true? If so how big of a threat is it to the health of my engine.

I told you thats what he would say...its not that they wont hold it...but he doesnt want to introduce the pi cams to the stock springs that have been used the the npi cams lift for 100k miles.

He doesnt want to be responsible if something goes wrong...you need to do the pi cams yourself.

 

[Jrgunn5150]

It doesn't matter, they are fine. 100k on NPI cams is the same as 100k on pi cams... THEY ART THE SAME PART. DOn't beleive me? Call your local dealer tomarrow, ask for a valve spring part number for your car, and then call back and ask for a part number for a 99 GT.

It's just that he want's to sell a set of springs and install for them.

 

[justinschmidt1]

I dont even think thats it...

he talked to some dude at ford that told him all this stuff saying it wasnt a good idea to run pi cams in npi heads for various reasons.

He didnt say it wont work.

whatever...hes a good guy and he knows his shit when it comes to mustangs...I trust him with my car.

 

[MustangMatt96GT]

wow, i would never take my car to him


THE GODDAMN PART NUMBERS ARE THE SAME!!!!


And these valve springs dont wear out at 100K. He just is trying to upsell.

 

[justinschmidt1]

wow, i would never take my car to him


THE GODDAMN PART NUMBERS ARE THE SAME!!!!


And these valve springs dont wear out at 100K. He just is trying to upsell.

again dude...this guy has been working on stangs for 20 years.

Theres reasons why he is saying that.

 

[MustangMatt96GT]

what would the reason be? YOu want to tell me...


There is absolutly no reason to change out srpigns on a NPI to a PI cam swap. The seat pressure and the lift in both springs is the same.

 

[97stanger]

^ Thats right. The guys are right man the springs are the exact same. I mean, it wouldnt be a terrible idea to change your springs...it never is when changing cams. But you absolutely dont have to change them when just throwing in PI cams. Like said, the guy is trying to sell you springs and do more labor.

 

[justinschmidt1]

he told me:

The spring pressure of the spring dictactes the ramp speed of a cam that can be used with them as well as max rpm. The npi springs cannot handle properly the ramp speeds of the pi cams.


He says the springs are differant.....doesnt look like they are though..

whatever...do the work yourself and you wont have this problem

 

[Jrgunn5150]

he told me:

The spring pressure of the spring dictactes the ramp speed of a cam that can be used with them as well as max rpm. The npi springs cannot handle properly the ramp speeds of the pi cams.


He says the springs are differant.....doesnt look like they are though..

whatever...do the work yourself and you wont have this problem

And I told you, you don't have to take my word for it, call your local dealer and get the part number's. Although my feeling's are hurt that you don't.

Or just close your eyes, put your finger's in your ear's and run around screaming "LALALALALAL LALA LA LA LA LA LALL ALALAL ALAAL LA L AL AL A I TRUUUSSSTTTT YOOOOOOOOOOOOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU" While he butt rapes you.

 

[justinschmidt1]

he told me:

The spring pressure of the spring dictactes the ramp speed of a cam that can be used with them as well as max rpm. The npi springs cannot handle properly the ramp speeds of the pi cams.


He says the springs are differant.....doesnt look like they are though..

whatever...do the work yourself and you wont have this problem

And I told you, you don't have to take my word for it, call your local dealer and get the part number's. Although my feeling's are hurt that you don't.

Or just close your eyes, put your finger's in your ear's and run around screaming "LALALALALAL LALA LA LA LA LA LALL ALALAL ALAAL LA L AL AL A I TRUUUSSSTTTT YOOOOOOOOOOOOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU" While he butt rapes you.

I already looked up the part and it does say from 96-04 so they should be the same.

Im not paying him to do pi cams.

 

[Jrgunn5150]

:hammer: Good choice :thumb: I wouldn't steer you guy's wrong, even if I am a bit harsh at times.

 

[justinschmidt1]

:hammer: Good choice :thumb: I wouldn't steer you guy's wrong, even if I am a bit harsh at times.

lol..I was never gonna pay him to do them..it san sn97nygt or w/e

I think im gonna end up doing the pi cams myself....maybe never..

I dont want to spend any more money on this damn car

 

[reivaxtorres]

:hammer: Good choice :thumb: I wouldn't steer you guy's wrong, even if I am a bit harsh at times.

a "bit"??? lol



and yeah, justinschmidt1 and sn97gtnyg, the ONLY thing different about the springs in the PI heads vs the ones in the NPI heads is the fact that the NPI springs are only used to running a .5 lift, while the PI springs are used to running a .55 lift. up to 6k rpms, this doesnt have much of an effect on the springs at all, even if the npi springs are old. when i installed my PI cams, i had well over 120k miles on my car, and the PI cams ran flawlessly

 

[reivaxtorres]

:hammer: Good choice :thumb: I wouldn't steer you guy's wrong, even if I am a bit harsh at times.

lol..I was never gonna pay him to do them..it san sn97nygt or w/e

I think im gonna end up doing the pi cams myself....maybe never..

I dont want to spend any more money on this damn car

i say do it yourself. you can get it done (with hand tools, no air tools) in a matter of hours. prob 3-4 hours tops

 

[justinschmidt1]

:hammer: Good choice :thumb: I wouldn't steer you guy's wrong, even if I am a bit harsh at times.

a "bit"??? lol



and yeah, justinschmidt1 and sn97gtnyg, the ONLY thing different about the springs in the PI heads vs the ones in the NPI heads is the fact that the NPI springs are only used to running a .5 lift, while the PI springs are used to running a .55 lift. up to 6k rpms, this doesnt have much of an effect on the springs at all, even if the npi springs are old. when i installed my PI cams, i had well over 120k miles on my car, and the PI cams ran flawlessly

as did 100 other people...like I said...he was gonna do mine and was all fine with it untill some Ford Tech guy filled his head with this information.

He doesnt want to do the pi cams on a npi car without replacing the springs I guess...

do it yourself then...

your gonna get raped to install any cams on our motors..

 

[justinschmidt1]

:hammer: Good choice :thumb: I wouldn't steer you guy's wrong, even if I am a bit harsh at times.

lol..I was never gonna pay him to do them..it san sn97nygt or w/e

I think im gonna end up doing the pi cams myself....maybe never..

I dont want to spend any more money on this damn car

i say do it yourself. you can get it done (with hand tools, no air tools) in a matter of hours. prob 3-4 hours tops

really....do you have a good picture guide on how to do it without the anderson tool?

 

[justinschmidt1]

hey guys
I got a reply and you can take it for what you want...but i believe him. Theres no reason for him to lie.


I called Ford Motorsport directly the day I did the swap. He looked up the specs for both pi and non pi and they were different. The replacement springs are indeed the same, Ford has combined the two because a spring with more spring pressure will always work in a application where not as much is needed...

..so basically the replacement spring will be the same but the spring that is in our npi heads is differant.