Hot Boat

I just got finished building a 28 excel with a 575 HP motor in it I will be running the motor at 5300 rpm to reach peek HP. what would you estimate my speed at. I don't have my prop picked out yet. I just know that there some people out there that are running the same boat with similar power or even more. I would like to know there results.

I am looking for true speeds only. I raced a 38 formula yesterday for a brief run while testing props and walked right by him. he asked me how fast I was and I said I didn't know ( but I did) . He said his boat ran 80 mph with twin hp500's. Well I know that my boat was running around 67 - 68 on gps at the time. and I beat him. I also have a friends that has the same boat with 630 hp motors in it and the boat will just touch 70 MPH on gps.

So what I am trying to say is please post your boats real speed , HP, and prop your running.... not how fast you would like to run. This would be a great help to me.

Thanks

Paul

Scarab28

'89 Excel, 468, Procharger, 7 lbs boost. 26" Bravo one, 70.9 MPH at 5500 RPM on GPS.

Hot Boat

Scarab28 Thanks for the call the other day. I don't know if you read my post or not but I blew a head gasket that afternoon. I was getting water in the oil. I only had 2 hours on the motor. It should be fixed with in two weeks max if I need a head. I will make sure I get hold of you before I run up that way I would love to see the boat.

Any way what HP do you think you have and if you can could you post some of your engine specs.

Thanks

Paul

Hot Boat

I forgot . I raced a 38 formula with hp500's in it from your neck of the woods. I walked right by him. He said his boat does 80 Thats kind of funny because a friend has the same boat with 630 hp blower motors and just touches a bit over 70.

do you know the boat?????

Tinkerer

With the bigger boats it takes about 1/2 mile to get to top speed. You would probably blow past me also and I do 77 mph gps.

Scarab28

Sorry to hear about the head gasket. Been there, done that.

Anyways, here's the engine specs:

454 Mark IV, +.060
SRP flat top pistons, 8:1
Crane Cams (2500 - 5500 power range)
MR. Gasket head gaskets
Stock Rect port heads
Manley inconel exh valves, SS intakes
Team G Single plane intake
Procharger w/ M2 charger, 7 lb boost
SX electric fuel pump
750 Holley, 84 p, 98 s

I originally started with a Gen 5 block and blew a head gasket within hours. Knock on wood the Mark 4 is holding togehter nicely.

Keep us posted on how you make out. WHat are your Engine specs?

Hot Boat

28 Scarab do you run your boat on Lake George???? I see a 28 out there crusing with a 26 CV and one other boat every now and then.

Scarab28

No - Stictly Lake Ontario between Rochester and Sodus Bay.