We're waiting on the cams that's been sent in. This is old news.

 

It's not old news dingleberry...Has it been posted here...???

 

Looking forward to it....

 

4,000 - 7,000 with a hyd roller with max lift set at .660"

Would rather see 4,000 - 7,500, solid roller max .700" net lift.

Seems somewhat limiting, but maybe there's enough room in there for a decent range of specs.

points for Pk hp, Avg HP, PK trq, Avg Trk

 

Now your caught up..

 

A few responses... I haven't personally listened to either. They popped up in between me playing 2k25 and scrolling thru my subscriptions.

 

The .660" lift rule is because many LS cam swaps use basically other stock components that limit the cam lift. Chad is a good guy to do this challenge. He goes out of his way to learn and share experience.

 

Mark....it was Eric not Chad. Chad has some good Gun videos besides the cylinder head stuff. 👌

 

20 mins ago.. its my Day off and its going like this 2k,YB, YouTube in bed all day

 

23 cam swaps ..... That's going to be fun. lol

That will be interesting on the graph range.

 

🤦‍♂️

 

Yea, I meant Eric, misspoke.

 

Switch cams? Or the heads?

Same basic build & different heads not a cam switch around. Intake change with similar numbers?
1 cam 😂 vs 23 will only tell us what's good 4 this particular combination. Trends do carry over yet each build and cam choice won't carry over 2 another head or build cause it may not like the cam that was/maybe # 1 unless the same top end is used. Although it some to most times does But 640? And you late
to...🥱

The Ultimate Chevrolet LS Cylinder Head Test - Stock LS1 Dyno - Hot Rod Magazine

We test 11 different Chevrolet LS cylinder heads to see which one flows the most and produces the most hp and torque. Only at www.hotrod.com, the official website for Hot Rod Magazine.

www.motortrend.com

 

The only thing this is going to prove is what cam that particular engine combination likes, the rest is drama, but people seem to like drama.

 

There are a lot of 'custom' cam guys who you send your engine's stats to, and they send you the 'perfect' camshaft for your combination.
What Eric is doing, is putting the cam guys to the test. He is giving them every possible statistic for his engine, including actual flow data for the heads, cross section, etc... and is seeing who can send him the best camshaft. It's a fun competition. Nothing more, nothing less.

Cams will be tested for highest peak horsepower, highest peak torque, highest average horsepower from 4-7k rpm and highest average torque.

I look forward to seeing his results... even if it is on an LS engine. lol

 

Dude got a attitude cause I said it was ole...that simple

 

Every possible statistic? I doubt it. Induction length, header design, swirl tumble , wet flow, if you ever modeled an engine in a simulation program like Engine Mod 4t or Dynomation you understand that there is a lot more to it . The winner of this contest would likely not be the winner of the same group of contestants on a different engine. It's all subjective.

One thing it will prove, is who is really bad at picking cams. The guys who aren't even close.

 

Compared to the data a cam guy is usually sent, it's well in excess and accurate. Most people send in advertised numbers (if any) and don't have a clue about cross section, compression ratio is often inaccurate, etc. Is what it is, and will be fun to watch.

 

I'll be interested to see results , hope there is a text summary I don't enjoy or watch many videos.

 

It will be interesting. I did build a engmod4t model have worked out the specs to best suit the rules works out kind of oddball as imo best to chase peak torque and the average hp and average tq and ignore peak hp by trying to get it to peak really early

 

Seen this guy....

 

I could see it being a competition to build the most aggressive lobes that don’t float the valvetrain.

 

That is basically what makes the world go 'round when it comes to output! Lol

 

IMO no use worrying about the “aggressiveness” of the lobes until you’ve got the events pretty much spot on. I think the test will be a real eye opener so looking forward to it.

 

IMO no use worrying about the “aggressiveness” of the lobes until you’ve got the events pretty much spot on. I think the test will be a real eye opener so looking forward to it.

Speaking of events .....

Did you see in the video of the challenge between 1:30 - 2:15 and how Eric discussed valve events ?

It made me laugh.

 

While we wait, to about a month from now. How's about a 700+hp pump gas SBC.

 

Interesting distributor Set Up on that SBC i don't think i've seen that before!!

 

Speaking of events .....

Did you see in the video of the challenge between 1:30 - 2:15 and how Eric discussed valve events ?

It made me laugh.

Missed it all... was vacationing in the Azores, avoiding as much Bullet drama as possible.

 

Missed it all... was vacationing in the Azores, avoiding as much Bullet drama as possible.

It's in the video in post #1

 

For about 350k you can fix the correction factor BS. Lol
Many need to fix other stuff before going that far but......

 

It happens

It’s not my data, I’m just pointing it out what was presented.

Really it should be telling Eric that there might be issues with the dyno he uses, and either the owner of it needs to fix it, or he needs to find a new dyno. Even the May pull is 19%+ correction… that’s 4 months ago. These correction factors are inaccurate (source: the people who made them) when you’re talking double digit percent corrections.

 

It’s not my data, I’m just pointing it out what was presented.

Really it should be telling Eric that there might be issues with the dyno he uses, and either the owner of it needs to fix it, or he needs to find a new dyno. Even the May pull is 19%+ correction… that’s 4 months ago. These correction factors are inaccurate (source: the people who made them) when you’re talking double digit percent corrections.

Back in May I think the correction factor with the 565 was 9%. Some years back, when tested at higher temp and different DA I think 11%. I'll take a look later today.

Yes, 15% plus correction factor is a lot, but isn't that a DA thing ?

 

Correction Factors:
Correction factors assume an engine is going to be able to take full advantage of increasing air density, and all engines will respond exactly the same.

How I see it, is an engine that has limited flow potential will not be able to take the same advantage as an engine with a larger airflow path.
A small port is only going to flow a limited mass of air. A larger port will be better able to take advantage of increasing air density, as it will be more able to handle a higher mass flow.

Am I seeing this correctly?

 

For any correction factor, in all industries, it is only accurate within the parameters that it is outlined in the testing methods. So that’s within a certain +/- a certain percent total correction, but also includes deviations +/- % deviation on air temperature, oil temp, gas type and temp, coolant temp (and often it’s the jacket temp), humidity %, barometric pressure, stabilized power reading (so no sweep), knowing reciprocating losses, etc.

Just applying it without controlling anything the correction calls for introduces correction error, and then go beyond what the correction is accurate for, and you introduce increasing error the further you get away from that range.

Applying it with sensors that are half on the fritz, weather stations who knows where, calibration who knows what, etc, is like the like that meme of the infomercial guy slapping flex tape onto a leaking tank, or a landlord painting over moldy drywall, where people are trying to use the correction factor outside its intended use to fix errors.

I don’t think Eric is trying to mislead anyone, but that dyno needs sorting, and it’s something everyone should be looking at with their own graphs or anyone who shares them. It’s one thing if your dyno is repeatable and reads high or low, those numbers only mean something to you, but if people are selling horsepower results or are bench racing, then it should fair game to know.

Everyone likes to think air density, but humidty is going to effect combustion, so it just all depends.

 

23 cams in 3 days is going to be a feat in itself! Lol 😯

 

R.I.P. valve springs......