TGM

Have a 29ft fountain fever stepped hull. Motor is hp500 with 177 blower. I really want to get into the 80's next summer after the rebuild. I am trying to stay with the 177 blower and maybe adding a superchiller to get some extra hp. I'm just curious on what kind of hp I will need to get into 80's. I know the simple way is to go to a bigger blower, but I'd rather not. Boat all ready has a 28p bravo prop and I'll probab have it labbed to get an extra 1-2mph.

Crude Intentions

iTrader: (1)

What are you running now?

Also I know you say you don't want to go bigger but it's highly advised. There is a lot of good info on these blowers in the q&a section. The 177 just creates too much heat and was really meant for a smallblock street app. Depending on what you run now you may almost reach your goal with just a bigger blower. The cooler charge and better air flow will up your power a good bit.

Bigger blower doesn't mean harder on the engine. In your situation it would prolly be easier on the engine.

http://www.offshoreonly.com/forums/g...er-sizing.html

TGM

It easily ran 75mph, 77 was the best at the beginning of the season but the motor just kept dropping power everytime out. I know a bigger blower will help, just can't quite swing the extra cash right now.

Cole2534

iTrader: (1)

That's not good, how are you compression numbers? Might be time to do some refreshing, if not, I think playing with the prop would be a good way to go.

ealesh33

iTrader: (1)

What year is your 29?

TGM

The motor is out and torn apart now. Just want to know what hp I need to get 80 so I can tell the engine builder what to shoot for. Right now I'm going for around 650-675. It's a 97 fountain fever.

excalibur82

I don't think you are going to make that kind of power with a 177 unless you spin the hell out of it. You might want to look for a 250.

TooLateVTEC

iTrader: (1)

Rebuild the motor good enough to make 700HP with a 250 blower...sell the blower you have and buy a used intake/carb to run this season or until you save enough money up to buy the larger blower...IMO.

ealesh33

iTrader: (1)

I have a 95 27 fever with a 525sc, all stock except running 2 extra lbs of boost 560ish hp. I have seen 80.9mph just me and about 15 gallons of fuel, 77.8mph with 2 people and 60 gallons of fuel, and I have seen as low as 75mph loaded down in poor conditions. I would say I would need 625hp to run 80's on a more consistent basis, but there would still be those days where I would be 78-80 loaded down in poor conditions. I am pretty sure the 29's are the same speed as the 27's with same power. In mine if I wanted to hit 80's all the time no matter what 675hp is what I would be after, as loaded down and in poor conditions I think I would still be around 80-81mph. However, light load day and good conditions could probably see 85-86mph. From a 502 base 500hp you will need to upgrade to a 250 blower as the 177 is too small for you now, so definitely will be too small for some bumps in power. At minimum open up the stock heads to get them flowing some air. a good ground blower cam, and go to a 250 blower. That should get you 675ish hp on about 5-6lbs of boost. The 177 is maxed out at about 625hp, and on a stock 088 head set up the heads will be the limiting factor in a blower application at 625-650.

ealesh33

iTrader: (1)

I have looked into this, as I want to be able to hit 80's with a moderate load frequently. I talked to Bob Madara about a cam and roller set up that he says will get me 600-625hp on a stock 525sc so that's probably what I will be doing this winter as I want to keep the motor relatively stock for resale. If I was shooting for anything more then 675hp I would do a nice aluminum AFR type head and a 420 blower underdriven.