4.6 2 Valve COMP Cams XE274H Dyno Testing!
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- Опубліковано 27 жов 2019
- Looking for Non-PI 2V cams that work great NA or with boost? Check out the XE274H below!
www.compcams.com/xtreme-energ...
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These cams with the stock intake didn’t loose any power down low. That’s pretty cool
So cool to see you doing this video with comp. These cams are great for a NPI 4.6.
It’d be sick if you did a dyno comparison doing the same to the later PI 4.6l 2v to visually show how much of a difference is made.
A newer pi head/piston engine will have lower compression and thus make less power
you are my 4.6 hero, i recieved a 98 gt for free and will build it. thank you :D
Richard's got the use car salesman hand motions going on.
What size of inyectors were used with the cams and NA?
What cams are good for an NA PI 4.6 2v
Richard, I have 2010 cop car. Could I put in higher compression pistons, run these cams with similar results? Thanks
Also will I see any benefit running these cams on my NPI heads and NPI intake? Other than sound ?
Wow, im more amaszed you got 350 hp from an NA 4.6 with no cams... im going to do this build !!! with cams !!! seams likea really strong na build !!
Did you have a forged lower to make those boosted numbers? i heard they where only good to 500 tops?
Made that much power on stock internals? Which are only capable of handling 400-450 HP ?
Did you degree the cams?
Hey just letting you know Mike is going to have the truck today I will be here at the bar but he won't he'll be out mowing
Did this engine have valve relief pistons?
It looks like the NA cams made 387hp not 377
Hey Richard,
What do you think this application would have done with some stock Romeo heads? I’m guessing the ported heads did far less than the cam swap hear.
Head porting can be worth good power on its own even with the stock pi cam and intake manifold however upgrading the whole combo (heads, cams, induction and exhaust) that you get much more gains. With that said, theres good power to be had from any of the 2v mod motors. The stock npi intake and cam is terrible but easily swapped. Companies like Renegade have really proved the potential with ported npi 2v combos. Johnny Langtons car early on ran with stock stock pi camshafts, stock pi intake manifold, 9.2:1 compression and running 12s in a thunderbird chassis which is a solid 3700lb car all with a 4r70 auto! This shows how much you can do with what these little engines got to give.
I would like to do a PI swap and cam to my 1998 Mustang GT . Any suggestions I need help thank you
Me and my friend are doing the same thing with his 97 mustang, we're doing the whole PI swap, heads, intake, we haven't decided on cams yet but Comp Cams XE270AH is what we'll probably go with, new torque converter I think 2400 ish stall, and 3.73 gears.
Was this cam used with stick pistons? Or were valve reliefs needed?
These cams should clear as long as their degreed. They have less peak lift but the valve is open much longer due to the increase in duration. Imho, the valve doesn't gain a whole lot opening that few extra hundredths at the cost of duration. Mid lift flow is where it's at on pi hence why this combo works so well.
I'm currently running a 270 Comp Cams would I be able to run a Paxton Style supercharger
Yes.. I wonder why ppl ask these questions..lol
@@P71ScrewHead probably to get answers to them
@@jasonb.3874 oh yes, but isnt the answer obvious, both of them??
Did you have to add valve reliefs in the pistons?
@@zackarymorrow6484 no sir I did upgrade the valve springs
so a non pi block with ported pi heads will make 350whp or crank hp while with just an exhaust and tune basically? thats absolutely insane...
SlpprEatrr 03 it’s because of the flat piston non pi motors came with
No. Unfortunately a pi swap will not yield 350whp n/a unless some serious work is done to not only to the heads but also the bottom end (raising compression). Richard tests these engines with nothing but the crank pulley, he has a electric water pump, no alternator, etc. Etc. However that doesn't mean you can't eclipse the 300whp mark with a pi swap. There have been people who have accomplished that with stock cams. Also the npi bottom end came with a slight dish in the piston. They are not true flat top pistons. They have a dish of 10 or 11cc, I belive. The pi has a dish of 18cc I think.
@@kevinpazos9846 not bc of a pi swap, but bc of the raised compression. Non pi block, non pi pistons, then ported pi heads, should give close to 10.5:1 compression which is what was making about 300whp. I know a simple pi motor wouldnt make 300whp without alot of work
@@creepystank420The npi's biggest downside is mostly its intake and head design, although yes the added compression does help some you are indeed correct. Some people go as far as to swap a lincoln mark viii shortblock with pi heads to make well over 300whp with stock cams, as im sure you already know. Its a cheap way to lose 80lbs off the nose of the car and break 300whp, and compression would be in the 11:1 range. (dont quote me though I dont have my service manual near me)
@@kevinpazos9846 after watching some more videos i found that bc of pi heads having a small combustion chamber, that causes the higher compression. My motor blew about two weeks ago and im looking for the best combo to throw back in it
Are you the same guy that used to write in the magazines?
Yes he is
So how much would it be with a pulley swap? 2.5” blower pulley should be right at 14 lbs from what I was told. Please test that. I have this same combo and no Dyno close n my town. Help me!!
Assuming the tune is spot on you should pick up another 30-50hp with the increase of boost but it won't be till the top end.
@@madmod if you changed the pulley that much power would be increased through the entire boost range
@@bodyshotjake7475 The entire boost range offered by a centri is pretty much only high rpms. Centrifugal blowers always have a rising boost curve producing almost no boost until 3k rpms or often higher if you've got a well breathing combo. The boost response will be improved some but it won't get close to the low rpm boost response of positive displacement supercharging or turbocharging because that blower simply doesn't move air until much higher blower speeds. When you drop pulley sizes with a centri, expect gains past where peak power occurred prior but expect very little under 3k rpm because there's just not enough volume of air being moved at low blower speeds. I've actually got a v2 vortech blower off my old 98 planning to go on my mark viii so I've got good experience with these blowers.
@@madmod depends on the Trim your referring to as well. I start making boost on my setup at 2800rpm I have a V1 upgraded to the Si trim. I’m running a 3.125 pulley and I promise you when I drop that to the 2.8 and add the 15% OD crank pulley my boost will increase in the entire operation range. Will it start to build at 1100rpm no but the range will open.
@@bodyshotjake7475 Centris just don't have low rpm boost response and it's a moot effort trying to make it happen. Of course it will bring the boost in slightly earlier with an increase PR but you will see marginally no boost below 3k rpms regardless. Ideally you want as much blower speed with the least amount of measured boost as possible because centris always have a crazy rising boost curve with rpm.
Prior military... more than likely a Marine way too many knife hands lol
how much boost Can a stock 2v handle?
About 9-10 psi, or about 400 rwhp.
Anything higher than that the motor will grenade
I’m at 448/415 whp with a Vortech and little support mods.
My car has 165k and has been supercharged for nearly 90k miles now. I pound the piss out of this car at least once every time out.
They can make 475 comfortably with cams and boost.
Ba P Yea if you have a terrible tune 😂🤣
What do you mean that's all the time you have? It's a youtube video not tv, give us even more detail!
The porting of the heads is where this one loses that average 4.6 Mod Mustang owner.
I’ll be honest, I bet the ported heads did little for this application. Bet if he slapped some stock Romeo heads on it it would make nearly identical power. I think ported heads might really only help in a boozed application when shooting for 700