Summit Pro LS Cams
Teching In
Joined: Mar 2018
Posts: 26
Likes: 0
From: Bristol, TN
To put it simply. The bottom end and RPM range determines how much air the engine wants. The heads will determine how fast you can fill the cylinder. Based on that you can determine how long to open the valves. If you don't open the valve long enough, you don't build as much cylinder pressure as you could. Hold it open too long, and you bleed off cylinder pressure. A better flowing set of heads on the same bottom end will need a smaller camshaft to optimize cylinder pressure.
Edit: I misread what he said, but i'm gonna leave it.
Last edited by Broken944; Sep 20, 2018 at 02:10 PM.
Restricted User
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
I'll disagree with that. There are too many variables to have a 1 size fits all. For example, you have a certain bottom end. 4 different heads with different flow characteristics will need 4 different camshafts to optimize performance on that bottom end. Want to change the RPM range for towing, rock crawling, drag racing, etc? Camshaft will change. Stroker? Different camshaft.
To put it simply. The bottom end and RPM range determines how much air the engine wants. The heads will determine how fast you can fill the cylinder. Based on that you can determine how long to open the valves. If you don't open the valve long enough, you don't build as much cylinder pressure as you could. Hold it open too long, and you bleed off cylinder pressure. A better flowing set of heads on the same bottom end will need a smaller camshaft to optimize cylinder pressure.
To put it simply. The bottom end and RPM range determines how much air the engine wants. The heads will determine how fast you can fill the cylinder. Based on that you can determine how long to open the valves. If you don't open the valve long enough, you don't build as much cylinder pressure as you could. Hold it open too long, and you bleed off cylinder pressure. A better flowing set of heads on the same bottom end will need a smaller camshaft to optimize cylinder pressure.
He isn't saying that there is a single cam out there that works for everything. He's saying that for everything, there is already a cam out there somewhere that works.
On The Tree
Joined: Apr 2005
Posts: 167
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Teching In
Joined: Mar 2018
Posts: 26
Likes: 0
From: Bristol, TN
I still do not wholly agree. I've seen cams from the big names out there get replaced with a proper custom and make a big difference. Maybe they picked the wrong camshaft at the start, but someone who understands the math behind this stuff can definitely get more than 1% improvement.
No haven't gotten it together have Everything for the Long Block Ls3 combo that is along with trans and Tq converter...Again Everything. Ls7 top end needs springs and intake. Truck is together with 8.8 rear 1990 S10. I must remember most on here are Lame as hell and just follow the trend.. We call them Groupies....Go ahead and get this bunk as cam that Everyone and there Mom can get. Lame as dude says 1% for a cam that makes more, that is a plus dip sh*+ @ around the same cost.
Ask anyone I'm messing with are those pie in the sky post = numbers, and facts lil buddy. Dude your 700 hp 11 second or your old 10.6@132 pass says it all. I don't F with Slow people. You need to ask someone?
Ask anyone I'm messing with are those pie in the sky post = numbers, and facts lil buddy. Dude your 700 hp 11 second or your old 10.6@132 pass says it all. I don't F with Slow people. You need to ask someone?
So what are the specs on your "custom cam"? I guarantee I can find a shelf cam identical. There are literally 1000s of cams out there and with a little know how and research you can spec your own cam and buy it "off the shelf". I think I just realized the problem though, your to dumb or lazy to do any of that so it's easier to call a cam company and let them do it.
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Banned
Joined: Apr 2017
Posts: 948
Likes: 1
Let me see here, so you can find a identical shelf cam: 260/272 @ .050 .730 both sides 113 Lsa. Yea it's better to call and have a cam Spec'd that's what they do and they should have references from other builds to get you what you would like.....cam listed should make peak Hp @ 7400 - 7500 rpm and good for min. 730 fwhp. Find this one idiot. No need to look into a master lobe reference book....I've looked and did this also. Smart enough to make a phone call idiot to someone who does this for a living and has reference builds with similar cams that a person wants to use.
If it doesn't do what I'm asking I'll burn it! Not part it out....Burn it!
We all good. Just want to add to this site not detract from it. I hope you do put together a hell of a truck
TECH Senior Member
Joined: Jun 2016
Posts: 22,289
Likes: 3,615
From: Central Cal.
Let me see here, so you can find a identical shelf cam: 260/272 @ .050 .730 both sides 113 Lsa. Yea it's better to call and have a cam Spec'd that's what they do and they should have references from other builds to get you what you would like.....cam listed should make peak Hp @ 7400 - 7500 rpm and good for min. 730 fwhp. Find this one idiot. No need to look into a master lobe reference book....I've looked and did this also. Smart enough to make a phone call idiot to someone who does this for a living and has reference builds with similar cams that a person wants to use.
If it doesn't do what I'm asking I'll burn it! Not part it out....Burn it!
If it doesn't do what I'm asking I'll burn it! Not part it out....Burn it!
TECH Senior Member
Joined: Jun 2016
Posts: 22,289
Likes: 3,615
From: Central Cal.
TECH Senior Member
Joined: Jun 2016
Posts: 22,289
Likes: 3,615
From: Central Cal.
Banned
Joined: Apr 2017
Posts: 948
Likes: 1
When does anyone make $ doing race/modded engines or cars as a Owner if it's not a business deal or have sponsors? Or grudge racing with $ on the line. Uncle runs a shop and is a former Crew chief, engine builder, and driver:comp eliminator vs guys like R.Coleman .... I like it but it's a $ losing sport. FACT! Go to Wallace calculators and calculate 2700 lbs & 720 hp and see what the ET is. BTW I should have more. Also you keep saying sober...lil buddy I just got away with weapon charges I'm WAY past the 3 strikes law ....I gotta stay sober. 7 months and counting.
Last edited by Patron; Sep 21, 2018 at 12:59 AM.
Restricted User
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
Comp 13065/13068-113 is a 259/271 .720/.720 113 LSA hydraulic roller.
Comp 14346/14350-113 is a 260/268 .739/.739 113 LSA hydraulic roller.
Comp 12106/12112-113 is a 261/273 .715/.715 113 LSA hydraulic roller.
Comp 12636/12136-113 is a 259/271 .715/.715 113 LSA hydraulic roller.
When used with 1.7 rockers:
Comp 13988/13994-113 is a 259/271 .755/.755 113 LSA hydraulic roller.
If you want, I can go through their solid rollers just to show you how still not special your custom cam is.
And I still haven't checked any other manufacturers yet.
All of these will make within 1-2% power of your 'custom' cam.
Banned
Joined: Apr 2017
Posts: 948
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Yea, I'm like you Dang. Yea go look up solids ... I'm running Chris Straub: bearing less lifters. That's too easy.......I gave you the specs...... While your there spec me a cam for a 8500 rpm peak that does lose that much power on shift recovery. Or do you need me to Give the specs for that also. Or make a phone call to get references. Anybody can look up a reference # to match someone's profile. You have none for this 1 so spec it ......Most guys I know don't give out specs!!!!! They do here cause it's friendly and there's nothing wrong with that. So you spec cams. Spec what I just asked 8500 that still has power under the curve. It's kinda a Grudge cam.......No specs are given. Your trying to one up the other guy that you have no cam specs for.
Match it cam matcher. Hell a blind man can go look thru Comp master lobe and match or copy a lobe.......Match something with no specs. Just power band and peak and get within 1% 4 inch crank .030 over . I have the specs. BTW 1.8 rockers. Your no cam maker but can copy to match a cam. Nothing to copy this time.
Match it cam matcher. Hell a blind man can go look thru Comp master lobe and match or copy a lobe.......Match something with no specs. Just power band and peak and get within 1% 4 inch crank .030 over . I have the specs. BTW 1.8 rockers. Your no cam maker but can copy to match a cam. Nothing to copy this time.
Restricted User
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
You're not proving anything here. You are rambling and making yourself look bad.
Thread Starter
LS1Tech Sponsor
Joined: Jan 2008
Posts: 2,232
Likes: 1,521
From: Ohio, Georgia, Nevada, Texas
Folks, we're getting a little off track here. This thread is here to inform. The Pro LS cams are a good lineup of great cams that are more than a match for anything in the operating range they are designed for. If you need a Greg Anderson motor, that can be arranged.
Last edited by Summitracing; Sep 21, 2018 at 09:56 AM.
