Camshaft Choices

[spitfirees20]

Oh, those comp cams sound pretty good, close to stock too. I don't really care about sound, I just want the power and something that would work with a blower in the future.

 

[four six]

see sig...

 

[spitfirees20]

Haha I was reading your sig and was like "What the hell, he did a full PI swap and has VT N/A Stage I heads, how does that apply to me?", then I looked down

 

[CobraRed_96_GT]

whats wrong with it?

The heads that were sold to me then put bronze guides in, and springs wouldn't flow oil to the top of the head correctly, specifically the driver's side head. Leaving much of the valve train oil lacking, including the cam followers which stay collapsed, making that noise. Head swap numero dose in process

 

[98COBRA281]

The heads that were sold to me then put bronze guides in, and springs wouldn't flow oil to the top of the head correctly, specifically the driver's side head. Leaving much of the valve train oil lacking, including the cam followers which stay collapsed, making that noise. Head swap numero dose in process

your changing the heads again, that rely sucks, good luck this time

 

[CobraRed_96_GT]

your changing the heads again, that rely sucks, good luck this time

Thanks, they were warrantied - so it's not totally crappy. But i don't get reimbursed for all the time the swap and figuring out what the problem was

 

[AntiRice98]

I think thats just one step above my cams. Should be fine. I was going to get those are the 270's but my PV clearance was wayyy to close for comfort.

 

[CobraRed_96_GT]

It's not a step above any stage, the 268H is the stage I NPI cam.

 

[AntiRice98]

Your right, I didn't see the H. It is a NPI cam. Which means the lift is .500 not .550...I have a set of XE274H cams for sale * cough cough* Only about 1k miles very good shape. 250 takes them

 

[spitfirees20]

I don't care, I'm learning as I read also

 

[CobraRed_96_GT]

i think i read that up somewhere that they were npi cams. are there any advantages or setbacks from running npi aftermarket cams on a pi motor? is that a good cam?

sorry to the original poster, not trying to steal your threat just hoping to get something cleared out.

no advantages in running a NPI cam on a PI motor, it's tailored for the NPI set-up and has less lift - so nothing really to gain from using it in a PI combo.

 

[98COBRA281]

most aftermarket npi cams had a .500 lift, & most aftermarket pi cams have .550 lift...

 

[CobraRed_96_GT]

alright this might sound a bit noobish. but higher lift is better for more top end and a higher power band right? or am i confusing that with duration? im assuming the pi heads had lower lift to make power down low with their more restrictive heads and the pi heads are vice versa?

you're half right if that 1st pi you mentioned was supposed to be NPI. Duration is length of time the valve is open considering any point in the lift cycle - measure by degrees, yet that's not the only determinant - as LSA or lobe separation also measures the period (in degrees) of time in between the exhaust/intake cycle, but its actual number is specific to the cam and doesn't tell you the whole story as it is the sum of two figures that are then halved. The lift is in actual inches, the further it needs to lift with a constant duration means the faster the valves are traveling into the cylinder and therefore the faster it needs to re-seat often requiring higher seat pressure valve springs.

 

[CobraRed_96_GT]

yeah thats what i meant. my mistake. so someone posted earlier that the cams i posted up were a little more aggresive compared to theirs. assuming they were pi cams as well. but then somebody pointed out they were npi cams they turned out to be a "stage 1". is there that much difference in cams even in the aftermarket for npi and pi heads? what would the 268H be comparable too in a pi aftermarket cam?

Actually it goes like this:

........Stage 1......Stage 2......Stage3
NPI....262H..........268H..........274H
PI.....262AH........270AH........278AH

So the 262H is actually their NPI stage I, but even tho the 268 has more duration giving it that more lopy sound IMO, the 262AH has more lift and a tighter LSA so i think they perform rather equally.

 

[FoxRod87]

Antirice98 Your car sounds wicked. I love good sounding cams and tailpipes. They just make them sound alot better.

 

[Green&GoldGT]

S/C camshafts will work fine and gain power in a N/A motor (as long as it's not too big). Generally, N/A camshafts have a lower lsa while blower/turbo camshafts have a higher lsa.

 

[AntiRice98]

Antirice98 Your car sounds wicked. I love good sounding cams and tailpipes. They just make them sound alot better.

thanks man, nice to know someone else likes my car after all the hard work went into it haha.