treyZ28

I watch people pick big cams when they dont want to gear or stall their cars
I watch people get big cams and short shift because they dont want to/ cant rev.
I see a lot of silly things. After a while you grow to expect it.

Mostly I think its picking a camshaft before picking a goal and/or powerband. Gets them everytime.

RedHardSupra

iTrader: (1)

AMEN brother!
people like the idea and illusion of a fast car more than actually owning one.
if you want a great fun daily driver wtih loads of torque and no need to rev high, get a small turbo. if you want a racecar, you gotta figure out exactly how the parts work together. but again, that would require plan and budget, none of that 'i got 200bux this month, what gizmo can i buy now?' hyped up reactions.

it's in the balance of the system, not in some specifications of the parts

Ed Wright

iTrader: (1)

Who's is "our" Pro Stock engines? Which car?

Ed

z-ya

iTrader: (1)

Ferrea also makes the sodium filled exhausts.

MadBill

The way I see it, about 80% of engines get the "wrong" cam: 50 % because the owner's just gotta have one from "the bottom of the page" (where the really big cams reside), and another 30% that really can use a cam in this general range, but don't get exactly what they need because the cam companies have dumbed-down the LCAs, E/I duration splits and relative lifts on many of the big (catalogued) sticks to reduce the negative effects of too much cam, in an effort to save the first 50% from their own bad judgement. This leaves the rational 10% who select the correct "small" cam for their application and the fanatic 10% who ignore the catalog and order up exactly the lobes and LCAs their engines need from the 9,000 profiles that aren't even in it.

treyZ28

camshaft pride

Old SStroker

I agree, but maybe the 80% is low and the 10% is high. Very few of that 10% group are able to select the "correct" valve events themselves, so relying on an engine designer is a good idea. My observation is that the folks with the least "engine ego" are the most receptive to having someone else choose their cam. Some of the most knowledgeable gear heads admit they need help choosing cams, and are happy to pay for the work. I define them as not having a large "engine ego".

OTOH, I have observed folks who have purchased a custom cam designed for their application reject the cam and never install it because when they saw it, or measured it, they decided it wasn't "custom enough", whatever that means. That's "engine ego" to an extreme. Ironically, the same grind, in an identical situation gave the results both customers wanted. One guy was pleased, one never knew what he missed. Guy #2 probably went back to the "bottom of the page". More power to him! (irony intended).

ShevrolayZ28

iTrader: (4)

I'm trying to get into that 10% . Maybe I need pick some brains in the truck forum lol.

Are any of you guys willing to comment on my "help me pick a cam" thread. I'd really appreciate it

https://ls1tech.com/forums/generation-iii-internal-engine/405758-low-wear-cam-help-me-pick-one-please.html

TIA!

treyZ28

heh. i understand cause and effect of LSA, IVO, IVC etc etc... but I dont think Id be very good at choosing my own cam.

What you desribed reminds me of mechanical engineers trying to do a mechanics work. Just because you understand it doesn't mean you should be doing it.

The replacement air conditioning unit at my fraternity was expensive as was the labor, since we just doubled it. Or so i've heard. I'm not a fan of finances and budgets. Most signing credit card bills and hoping for the best come the 30th!

J-Rod

Sorry, thats an old,old post. I need to go back and cite my sources in it. That particular section of the post came from an article by David Reher of Reher-Morrison.

EDIT: I tried to go edit the post, but its almost 20K characters long. It was done with the old software, so you can't edit it. I need to split the post, etc.. insert a post, etc... So, anyhow, understand that ther eis info in there from David Reher, David Vizard, some of my own posting, and perhaps stuff from others I didn't spend a lot of time checking to see whoa ll I cited. Sorry for any confusion.

Ed Wright

iTrader: (1)

Don't know who you are, or where you work. Thought maybe you worked for a Pro Stock engine builder. I have a friend that runs NHRA Pro Stock (Really struggling lately), and I have also known David for close to 30 years.

Ric

Y'all, this is some DEEEEP stuff!!! And I like it.

I understand this was aimed at people who want a nasty cam with stupid lift and all, but I'd like to know if 918s would be sufficient for a mildly cammed(if upgraded at all) LS1. I love the whole design concept of the beehive spring, and may spring for a set(no pun intended) in the future. With a stock or mildly hotter cam, say nothing over 224*/.600", would I need to change lifters out as well, or will OEM pieces do fine?

Excellent read, by the way.

speedz06

Too many times I see people shy away from solid lifters--I work as a dyno tech(engine dyno)on occasion and can adjust a set of valves pretty quick.The time between adjustments on an ls engine are not too frequent.J-Rod since you put alot of thought into valvetrain,what do you think about those hydra-rev kits that AFR makes?Also,I noticed that builders use stud girdles past a certain point.Shaft mount rockers have also been something I've been thinkin about.I'm looking to get an extra 500 rpm of power and to spin the S/C faster making more boost.Going to 7000 rpm on a daily basis,with long term reliability.....how hard could that be?

PREDATOR-Z

And everyone thought I was nuts when i promoted light effective valvetrain mass with 918's.
Good to see this is comming to light.

BTW Katech makes 2.00 & 2.10 intake and 1.55 exhaust hollow valves, $575 for a whole set.
Guess what is going on my AFR 225's and my future 427?

http://www.katechengines.com/street_...tail.php?id=13

TwoFast4Lv

iTrader: (8)

Great read!

I agree FAR to many people get the wrong cam and are absolutely set on it! They have to get the nastiest sound and latest name in there car. Very few times would I used the cam a customer has picked for there car. Heck they are driving the thing every day in Seattle rush hour traffic(which is only rivaled by LA and NY at the moment)!

They all want to make huge peak numbers and have no idea what the "Under the curve" power is. Then complain when they can not tune it to run well and that it has "fitt's" in traffic or has to much cam surge.

Nice write up!

white2001s10

iTrader: (4)

Don't forget D.C.


Question for anyone who may have a good idea:

Could using 1.85 rockers increase the lift rate to a point that the stock lifters may not handle?
ref:
https://ls1tech.com/forums/showthrea...95#post3882295

Lasershop

iTrader: (2)

I did not read every post but I would like opinions whether you are a believer in a rev kit or not.

Adrenaline_Z

Rev kits make power. Ask my friend Tom who installed a stud girdle and rev kit.

If I recall, 23 HP at peak RPM with both, and the curves look pretty.

treyZ28

Not sure if it (I?) was mentioned-

but people also seem to think more hp = more fast.

Taking Torque curve X and moving it up 2000rpm will yeild you more power and slower track times unless you back that engine with gear.

always nice seeing a high hp, 8000rpm with factor gears to save gas

Adrenaline_Z

That's a given, but a rev kit wont shift the curve.

It will improve power across the board.

Anything to help valve control will augment power curves.