Horsepower guestimate

[ATS_Aaron]

Would anyone care to guestimate for me how much power I'll be making with my new setup?

760 62T cylinder (bored .5 mm over) 766cc actual displacement
ported by Riva for a blaster (bought from NorcalEX)
Pro-X pistons
Pro Design Cool Head
40cc domes (should yield 175 psi)
stock 62T carbs
V Force 2 reed valves
Speedworx/Riva/don't really know Dry Pipe with Riva manifold

I'm not looking for big speed, mostly midrange. We ride in a lake, and try to do flat water tricks. Occasionally we jump boat wakes (while keeping a safe distance).

I'll be looking for a new impeller soon, any recommendations?

Thanks,

Aaron

 

[chart102]

no idea about hp. but i just replaced my stock prop with a solas concorde 13/16 cut back 3 mm. THAT THING HOOKS UP!!!!!!! im still a noob, and i never thought a prop could make that big of a difference. thanks Impros!!

 

[Speedfreak]

This is a post by Orange Flattop Freestyler and what his motor makes. I am not sure but I've heard that all dynos vary in readings but this is a base to make a guess on... LOL that sounds like speculation

Engine mods are as follows:

R&D Dominator 785cc ported cylinder, modified by jetshed
Wiseco lite flattop forged pistons
Prox rods
Jetshed Trued-welded superstock crank
Superstock big-ported cases with ramps
R&D Dominator head with custom jetshed domes running approx 195psi
Jetshed lightened flywheel
ATP light weight billet couplers
MSD ignition
Factory pipe with custom jetshed chamber and custom stinger insert
R&D intake manifold
VForce 2 Reeds
Twin Riva Powerbomb 48mm carbs
Prok filters and outerwears

Probably some stuff ive forgotten but thats pretty much it for the engine

Built and tuned by Alan Pickard from Jetshed, run on his in house dyno @ 105.9bhp..

Its very very snappy with a massive wall of torque in the middle that rips through to the top.

 

[njfl]

I don't think it's an appropriate question to ask how much horsepower you are making with a given set of parts. If you really wanted to make the most horsepower with your parts, you would tweak tham for optimal flow so that your engine could push air/fuel through it at the maximum possible rate. This would also be happening at or near the maximum possible rpm. You stated that you don't care about top speed (=top rpm).

If you did assemble/modify those parts for maximum horsepower, I am quite certain that you would be dissatisfied with your bottom-end/mid performance.

If those parts are set up right and the porting is done right, you can have a lesser hp motor that will kick the butt of a higher hp one.

Keep in mind that horsepower claims are just one number that is a snapshot of the entire rpm range. Usually that snapshot is an rpm where you will not usually be operating the boat.

 

[robertg]

BTW I don't think you will get 175psi with 40cc domes. I think a stock 760 has 90 peak horsepower.