timucin

Here is the the engine

Disp:520 cu.in
Pistons:srp forged 9:1
Crane cams hyd-roller cam 632 lift with 1.7 r.arms
Crane gold 1.8 rocker arms
Full ported and polished heads from cobra racing 2.300 intakes
Accel assisted mercruiser ignition
Twin 800 cfms on top
Huge headers

I am guessing that this combo can make around 650 hp

1- are we agree untill here?

Then i add
Weiand 8-71 with 10 psi boost
Superchiller

Here is a formula : desired hp/current hp=PR
We already know the pr : 10psi
10/14.7=0.68
which is 1+0.68 = 1.68
if we solve the equation:
[desiredhp/current hp=Pr] = [pr X current hp= desired hp]
1.68 X 650 =1092 hp

desired hp- app losses =
1092 - %10 loss by belt,adiabatic loss,drive
982 hp

note these are all estimations done by the help of some books

My personal idea is, i will have an engine around 900-1000hp

What do you think?
Does it sound ok to you?

GLH

Is that for your Hemi or Skater?

timucin

LOL;
Glh believe it or not but i cant reach all projects.its nice ,i was looking for something to do now i dont have time to finish all

1-skater stays as it is.nothing to do with that
2-gtx stays as its is .nothing to do with that,waiting for papers and parts from the ex owner
3-f100 pickup project is going on car is at body shop
4-this engine is for the new boat; 28 turkish cat. planning 2200lbs empty wieght, 3500 lbs full rigged running wieght.single engine ,expecting around 110 mph 's

cobra marty

Figure 520CID x 1.2HP/CID = 624HP

then 624HP x 10lbs/18 = 970HP

then nothing works as well as expected, 1.2 might be generous-maybe closer to 1.1 with 9:1, and 10lbs is a lot for roots blower, lose 8-10%= 900HP.

Use 18 as base for carb, roots blowers is my experience.

But still 850-900HP is no slouch. Good luck.

timucin

Cobra;
thats also cool!

i only need a crankshaft for 540 cu.may be i should do that.......

wwwTOPDJcom

now for the drive , your not gonna use a bravo are you?

wwwTOPDJcom

ASD8 would be good for you because merc parts have to be in short supply there.

cobra marty

How do you post that picture of the motor?

JohnJan

9:1 compression with 10 pounds of boost is going to pound those SRP pistons into a very nice set of paper weights. If you get 'em out quick enough, maybe you can use them as ash trays.

GLH

LMAO