CAM LIFT-DOES IT MATTER? LET'S TALK TECH

HOW MUCH DOES CAM LIFT CHANGE POWER? DOES IT VARY? DOES HEAD FLOW (AT LIFT) COME INTO PLAY? WHAT ABOUT THE TEST MOTOR? LET'S TALK TECH.

[@thomasblottman6741]

The higher lift gain is also reduced if you have to go up to a higher spring pressure due to high lift.

[@richardholdener1727]

springs stayed the same

[@scotthatch4548]

If the intake manifold doesn't flow what the head can flow it will put a cap on total flow and so more lift doesn't increase the flow even if the head can flow more

[@frankfrosolonejr7010]

The stock ls4 intake was designed to do exactly that to limit the power and help protect the 4t65e from blowing input shafts and clutches and such limits the engine to 303hp when all the other stock intakes make much more power

[@vinceyoung5912]

Are vacuum secondary carbs better with automatic transmissions? Are flat top pistons and a larger combustion chamber better than dished pistons and a smaller combustion chamber? Or domed?

[@richardholdener1727]

smaller chamber and flat top

[@vinceyoung5912]

@@richardholdener1727 I’d like to run L98 aluminum heads on a 400 sbc with an Isky 292 flat hydraulic cam. It think the cr will be too high with flat tops. Should I stay with the dish piston?

[@melkerpersson3323]

Everybody need to look for bottlenecks

[@Jason-kn3tw]

More lift and keeping the duration the same would have faster opening , so wouldn't that alone increase hp regardless

[@richardholdener1727]

that is why we tested-because theories don't make hp

[@Jason-kn3tw]

Yeah testing is good , engine dyno isn't a car either so all isn't known It could accelerate faster and you're not seeing that on dyno either All just thinking out loud

[@markmccarty9793]

Yes, I agree. Increase lift doesn't have as much low end torque as increasing duration.

[@anealsrikant9254]

You know before I watched the stream I used to think I was no such thing as a stupid question.. I stand corrected LOL. I got a question has anybody actually done the hybrid built with the LS3 bottom end and an LT Gen 5 head? I watched your video and it was very eye-opening and now I'm actually thinking about building one of these how do you think it would perform with 91 octane? Most likely going into a car that weighs under 3,000 lb and would be for a road course situation no drag racing

[@anealsrikant9254]

Forgot to mention horsepower wise I'll be looking around 5 00 to 540 horsepower at 7,000 RPMs so I would be shifting say 7500 RPMs ish on a wet sump thanks man and anybody else reading this

[@richardholdener1727]

that route is very expensive-you can make your power with an ls3

[@samstewart4807]

Hi Richard, HOW much max lift can I use a street LS and Drive it 100 k miles? .550? .600? or- USING proper rocker arms/ pushrods for that cam?

[@richardholdener1727]

the question is WHY do you want max lift?

[@samstewart4807]

@@richardholdener1727 hi Richard, Is lift not the determining factor in valvetrain life? aka more lift more spring pressure=less valve train life. Are guys running a .600 lift cam in an LS engine for 100k miles on the street?

[@mikes.1882]

Bottom line is modern engines are variable timed, boosted smaller and more power. OP question, my answer, All things considered, not in the modern world. Case in point. 1.5L 4cyl variable everything with turbo boost in a small crossover . 200hp advertised. The Nissan Rogue. Runs really good, with 8k miles on the 2023 model

[@joe-hp4nk]

Why all the BS, you can say it in 15 minutes.