272 cams don't run out of steam till 9k

it's the blower going "oooowwwwwwwwwww ****** stop it!"

im fully aware of that. i sell primarly to oreilly autoparts

 

If his advertised numbers are in the 260s it would actually be a bit less overlap than the 272s you are buying.

But then again, more lift at .050" opens up the oppurtunity for a torque loss down low. I bet it'll feel like a stock car to 3k rpm then be a monster above that.

 

Also 1mm is less than .050" so the duration @ .050 is less.

 

shows you how much i pay attention anymore

::shrugs::

besides, we are giving cams thread more attention

 

HKS 272s should be about 195 degrees at .050" iirc.

 

im going back to my hole now

 

That's what I was gonna say. I'm gonna be droppin in a .575 lift in my GTO, and that is a very streetable, and fairly mild to what I was originally planning.

I was gonna go to about .650, but I've got the 1.65 roller rockers already, so I am gonna stick with the .575. But I am gonna run a vacuum boost pump. I don't know what kinda lift numbers kill the vacuum on the LSJ.

Cam, do you think you will need to run a vacuum boost pump?

 

comp 5200

just need to find a hole to put it in

 

Wow, thats kinda mild. Well I guess not, since the stock LSJ intake cam duration is like 189 degrees @ 1mm.

Ok, I went and got my spec sheet. Most people will see the next few lines of my post as alien script, but who cares

Cam Timing @ .006" Lift
Intake - Opens @ 28.5* BTDC | Closes @ 57.5* ABDC | Advertised Duration - 266.0*
Exhaust - Opens @ 68.5* BBDC | Closes @ 17.5* ATDC | Advertised Duration - 266.0*

Cam Timing @ .050" Lift
Intake - Opens @ 5.0* BTDC | Closes @ 39.0* ABDC | Max Lift @ 110* ATDC | Duration - 224.0*
Exhaust - Opens @ 45.0* BBDC | Closes @ (1.0)* BTDC | Max Lift @ 110* BTDC | Duration - 224.0*

Intake Valve | Max Lift - .475" | Lift @ TDC - .067"
Exhaust Valve | Max Lift - .475" | Lift @ TDC - .046"

Lobe Separation Angle - 110*

 

im used to looking at v8 cams day in and day out, so i had to take a second look at it.

 

I see that Witt cought it already, but as a 2nd "heads up" with larger valve mass and a extra-wicked cam take at least a peak into the solid lifters, bates as stated make them, i think JBP said they will make there own(some past thread iirc) and trick titanium(two streets over from me) said they could make a baller set....with an equally baller price tag.

none the less, all builds run more$$$ then planed, thats like a given! so drop the extra coin to make things truly "full proof"....well at least as much as possible.

you might have covered this previously but what valve springs are you going to use? a real high seat pressure / spring rate is only going to increase the possible need for said lifter.

 

I'm sure nobody else will agree but I think those are excellent specs for the powerband you are looking for.

It might be a little noisy valvetrain with that quick ass ramp. I haven't compared it to the stock rate so I can't be certain but it might be a little harsh on the lifters.

I have a little more math on your cams from the info you posted above:

Overlap: 46 degrees
Intake Cam centerline: 104.5
Exhaust Cam centerline: 115.5

BTW, you wouldn't happen to have any of these cams for sale or any thing close thats not a regrind? I wouldn't mind replacing my reground ones with something fresh sometime later on.

 

you have a better chance of having the regrinds lasting longer than a billet core grind

 

I'm using Ferrea valve springs (74lbs IIRC), titanium intake/exhaust valves that are 1mm larger, and titanium retainers. I asked John with Ferrea about the stock lifters after telling him the cam specs, and he said they should hold up fine.

 

there were lifters that were collapsing under the bates springs alone.

the bates units are 92lb so if your at a min of 74 with a larger valve and such it might not be a bad idea....its all budget dependent of course.

 

The bates springs are good for 10000+ rpm. I never plan on reving anywhere near that high. The Ferrea units are good to a little over 9000, which is perfect for my app. Thats another reason he said the lifters should be fine, also the valves are titanium, which is lighter than stainless steel so even though there larger, they will weigh the same or even be lighter.

 

My head is about to explode

 

That's why you are supposed to keep it in your pants.

 

ZING!

hahahaha

 

zinga.

 

*whip* get back to building! heh

 

John from Ferrea called on Friday and said the valvetrain is ready to ship... After he receives the payment of $788 I don't have $788 at my disposal right now!!! If anyone wants to click the "donate" button on my myspace, feel free

 

Valvetrain shipped out today. Should be here by the end of the week.

 

^Good.

The list just keeps getting smaller and smaller.

 

so what you got left camren ivef been giong to the pavillions lately and there are a lot of newbes out there should hurry and show them up