Dyno Testing Twin Whipple Big Block Chevy

MarineAssault.net Quad rotor 540 970 HP on 91 octane unleaded with only 5 lbs of boost.

Category:

Autos & Vehicles

Tags:

• whipple
• BBC
• big
• block
• chevy
• dyno
• test
• engine
• blower

[xpeacockx]

That dude is an idiot.

And he might only be on 5lbs of boost because of the compression he's running?

[Moritzguy]

An idiot why?

Only 5 lbs of boost because no more was needed. The boat goes 120+ with a mild tune.

[xpeacockx]

Cause there was steam or something else everywhere, and something could've happened to the motor while on the dyno, and he was standing in the chamber

[Moritzguy]

Steam is because it is a boat engine and the headers have water going through them.

The dyno did not have a boost gage so boost had to be read by standing there and looking at it.

And ... what's the difference between standing near the engine or sitting right in front of it in a boat?

[Moritzguy]

No problem. Whipple's are screw compressors and are not as hard to turn as a roots blower.

use a serpentine belt in Marine applications. No relief valve allowed under a covered engine hatch. So the belt slips if there is a blower sneeze

[DrydensFinest]

chevy power

[AlchemistHawk]

lol the dude was like "holy shit... fuck this!"

[djw117]

there are draw backs though the energy required to turn over 2 blowers is stilll greater than the energy to turn over one even to they are geared up.. and the 91 octane fuel ive never seen a super charged donk run properly on anything less than pulp 98. espiacly when cold haha. maybe computer cars but thats a different ball park.

[harrychronikjr]

It's nice to get an explanation, instead of being called an idot. Thanks

[madtownmadman]

Less parasitic loss because the superchargers don't have to operate at such a high RPM. The faster you spin them, the more power they will consume. Any blower will be more efficient when it doesn't have to operate at its maximum output. Heat is created not so much by spinning so fast, but by the air being compressed on the outlet, or underside of the supercharger. That said, you would really have to spin and load the hell out of this setup, before it became not so efficient.

[harrychronikjr]

ok, that makes sense. except I don't understand how two can have less parasitic loss than one.

[madtownmadman]

Using two superchargers gives more power with less boost. Used in tandom, they displace huge amounts of air, and you don't need to spin them nearly as fast. Quite advantageous. Less parasitic loss. Less heat. Not to mention the use of just 91 octane fuel. The list goes on and on.

[medoseedo11]

That guy was in the test room. wow.... Thats not something that anyone should do without ear protection

[andymcdo]

they use two twin screw superchargers because most twin screw superchargers dont displace enough air to feed big cubic inch engines.

[Resound]

The difference would be that if the engine drops a rod or something similar the bits of metal go mostly sideways. If you're in front of it in the boat you get a fright and complain about the dead engine and the holes in the boat. If you're standing next to it you complain about the holes in you. If you can still complain, that is.

[wolts77]

Chuck that sucker in a car man. that is one mean mother.