mmb

My cam is a little smaller on duration, little larger on the lift. Could be several things keeping the engine from making power, unstable valve train, heads starting to go sonic, not enough carb. Doesn't always have to be the cam. But yes mine made power all the way to 6500.

KAAMA

Based on the past several years, I think it's pretty much common knowledge by now that a Whipple has the advantage over a Roots---it looks to have proven itself.

I know that when my builder had finished a long run on his dyno with a hard pull at the end that you could lay your hand on the blower case of a customer's Whipple and it would be cold to the touch. The Air Intake Temps are much cooler with a Whipple....that's at least one advantage of the Whipple vs a Roots.

38Raptor

That's some monster diameter u boys are runnin at 17.5. Keep the update posts coming, great project/thread and has been a joy to follow since the start. Any porpoise issues with that diameter over 90mph? I had 17" diameter on last summer on Old School and at 5400 was turning 97 on gps and had to go down in diameter or she wanted to literally jump out of the water so no way to open it up to 61-6200rpm safely...long way to go yet, needless to say, props redone this winter and waiting to try again when the pond thaws out.

kvogt

What rake angle are you running?

38Raptor

I don't remember....seems so long ago (last summer). BBlades boys fixed them up so we'll see what happens this summer when they get bolted on...don't want to high-jack and will get another thread going later.

cigrocket

I had 17.75 x 32 by BBlades on my straight bottom gun before I sold it, of course they were only 4 blades. You are definately making some power. Can't wait to hear the results. I was making somewhere near 900 HP at 5500. Boat ran 97 GPS with x dimension to the moon.

ICDEDPPL

Kvogt liking this.. that`s rich!

Zero Patience

We both run 15 rake, the fuel was and is 93 unleaded, ethanol. Pump gas. We will put the video up of the Dyno . On our run last Friday the whipples were wet with condensation, and cold to the touch.

frickstyle

Zero,

Are there any advantages when running the whipples in relation to octane ratings? I would assume that detonation has more to do with the cylinder head design and hotspots inside the engine/combustion chamber/ cylinder (also a relation to intake temps).?

I.E. - "I can safely make 50 more hp at the same octane rating, compression ratio, # of static boost with the Whipples". Or maybe is it that they are just more efficient therefore yielding a better average horsepower under the curve, and possibly a higher peak. Or can you actually run additional/more boost everything else being equal. Does my question make sense?

(I may have answered my own dumb question....)

mmb

You put new engines in?? Or are those N/A motors running that strong?