LS3 STROKER INTAKE TRIPLE TEST (FAST VS MAST)

FULL DYNO RESULTS. THREE LS COMBOS (LS3, 415 & 468). CHECK OUT THIS VIDEO WHERE I COMPARED THE FAST LSXR (LS3) TO THE MAST SINGLE PLANE ON THREE DIFFERENT LS3 COMBOS, INCLUDING A CAMMED LS3 CRATE MOTOR, A HEALTHY 415 LS3 STROKER AND A WILDER (HIGH COMP, BIG CAM) 468 LS3 STROKER. DOES THE SHORT-RUNNER, SINGLE PLANE WORK BEST WITH INCREASED DISPLACEMENT?

[Sweakv]

Richard you sure are a blessing with these videos especially when I'm stuck at home alot during these times. Keep up the good work.

[digitald]

Man you are a machine pumping out videos at 35psi

[TheFarCobra]

I would like to see a ported MSD intake comparison.

I am actually starting to like the raver intro music ... well, I am starting to associate it with a pleasant anticipation of good things to come.

[lloydholt]

Once again you quieted the nay sayers. Pick your operating range. Both perform as you showed. Thanks for sharing. The more I watch your videos the more I learn. Your a great teacher.

[DAThCAlDS]

always cool to see the clean, and strong incline on the graph.

[scottbennett]

Another highly interesting comparison video, thanks for your hard work!

[vikenlink]

Hi Richard.... in my opinion, the LS3 intake manifold makes the best power under the curve. Also economically the best choice for the money. If someone with deep pockets wants to spend over $1000.00 on a intake manifold like the cross ram style with two throttle bodies.... to make 20 hp more just to find out.... oh no my alternator is in the way of the driver side throttle body opening. What did I get my$elf into lol.
Keep up the cool videos!
Cheers

[jaydnisevil]

Great test!
This may be entirley impossible, but you know what'd be interesting.. Testing oversquare vs undersquare.
With the same displacement, same cam, intake etc..
Destroked big bore vs Stroker

See if the longer stroke does much to improve bottom end torque.

[neckcrank]

The reason the rpm crossover is lower when when displacement increases is CFM is the same at those RPMs

[bigredracer]

First 👍's up guys thanks again for taking us all along with you

[utahcountypicazospage]

I like watching this and precision transmissions because a good motor needs a great transmission to put the power down also the cam used first has high lift how often should you change valve springs

[Azyh]

I love watching his videos. I think it would be cool to watch build a flat plane crank Ls

[opieg]

If I were racing and intended to keep RPMs high, the trade off might be worth it, but it is interesting to think about the area under the curve through the intended operating rage and for the bigger displacements (say 5, 000 through 7, 000 rpm), with the cross over shifting lower, you might have more area on average under the short runner version, it is less clear that the area under the curve on a smaller displacement given you a better average power through the range. Might be the basis the the "flawed common logic". The gain in effective performance at the wheels is more pronounced in that rpm range for the larger displacement with differing runner sizes.

So my take-away is --- more cubes is more better!!!!

[dennisrobinson]

From the data if you rev it out to 7, 500 or above the carb style or shorter runner intakes make sense. For up to 6, 500 the long runner intakes make sense.

[jeremypike]

So Ford's engineers stated that the 7.3 liter size was the best compromise between fuel mileage and power. I wonder if the power crossover placement was why it was decided for their new engine to displace 7.3 liters or 445 cubic inches or just usable torque in the bottom of the powerband. They also stated they intended to take on the LS platform with the new design (engine swap popularity) specifically stating they intended the block to handle 1500 + hp and an excellent candidate for boost applications. Hoping richard puts one on the dyno for a Big Bang motor soon.

[petejoseph]

Great vid, Richard, glad it wasn’t a Caddy motor.

[beardoe]

Optimization has about five variables: displacement (for most people this is fixed), compression ratio, cam timing, intake runner tuning and exhaust runner tuning.

Playing with displacement and intake runner tuning is leaving three of the variables unexplored.

It's probably impractical from a time and budget perspective to do an exhaustive test on four variables but if you have an optimized combination, one change is going to bump you off of optimized, you need at least two changes to get back to an optimized state.

That 468 lost a bunch of torque and the shape of the curve went from rounded on top to a plateau. To me, that suggests the cam tuning is off with the single plane. A smaller cam might restore that shape without losing too much top end. Just try one with an intake valve closing 5° earlier.

Worst case it will lose power everywhere but I'll shut up about it.

Best case, you might keep a bunch of cams and some adjustable length dyno headers to fine tune your combos after you make a change you are testing.

[HeWhoDrivesATruck]

Also Rich, how about an Olds 260 build? I had one in my 76 Buick Skylark and it was a turd with the 2 bbl Rochester, but it ALWAYS fired up on the first 2 revolutions even in the winter when it was -10 with a foot of snow covering it. That was almost 20 years ago and I've never seen anyone do anything interesting with one. I would say that's a perfect example of "the other guy's" engine.

[wayneangrick]

Nice work! Thinking of building my 4.6 3v. Would love to see some boosted combinations. Especially tvs supercharged as I have a Saleen blower.

[HeWhoDrivesATruck]

Rich, while I appreciate ALL of your hard work and research on so many different types of engines, after seeing your work on the B16, I'd really like to see you do some Honda J series V6 builds. I'd just really like to see you do a few different versions of the J series engine. Say a J32A2 NA build, a J32A2 turbo build, and then move on to the same with a J35 and J37. I know that many people would watch it and be interested.