Help on 2.4 bp

[wrechin2]

I just got a 2.4 245hp to replace a blown 200hp. I am using all the electronics and carbs on it from the 200. I have the wh-22s. I was told that they are large chambered heads. The compression is 117-120 psi. I have no clue where to start. What rpm should I let it turn? What is my pick up and max timing? What can I do to improve performance? It is going on a 18' Astroglass bass boat (VERY HEAVY) Any help will be greatly appreciated!

[STV_Keith]

117-120psi is a little low. You can run up to 140-145psi on pump gas. Peak power is 6800-7000, but you can turn it harder. I think the limiters were supposed to be at 7500-7600.

Pickup timing is 0*, +/- 2*, with 26* max.

Cutting the heads would be the quickest bang for the buck mod to bring power up.

[QUICKSILVER]

Don't run the same carb jets from the 200 in the 245. They need to be upped quite a bit, at least .010

[STVmod]

put some 92 jets

25 deg timing

turn it till it won't turn no mo!!:D

[wrechin2]

it has .074 and .076 go to .084 and .086? ....092!? With it having large chambered heads do I need to go up that high? It doesn't have velocity stacks on it. That is my main concern is jetting. If I am jetted right I should have a small wet spot on the center of the piston when running wot and shutting down correct? Also I have the stock flywheel off the 200 on it. What can I turn it safely? Thanks again for all the responses.

[STVmod]

with that low compression"125" you would be fine around 85-86 jets.

with the stock wheel you should be able to turn around 7-7500 without too much risk of breakin the crank.

[wrechin2]

do I still need to run .02 richer on 2 and 5? Will the crank out of the 200 fit this engine? If so I may keep it as a spare. The stock boxes will let it turn 7k right? Thanks again

[STVmod]

dont think you need to with that compression... you should be fine with 86.

are you sure that motor has a rev limitor?

if it does come in just disconnect it

[us1]

I wouldn't go smaller than 92s in it.

[STVmod]

i would run 92 also; but taking into consideration his compression, he would be safe i think.

we have run 86 in race motors with 170 and 114 fuel with 27 deg timing, and been safe.

[us1]

I dont think he is running race gas.

[wrechin2]

run .092 jets in all carbs (including 2 and 5 or .002 larger?) and run 93 octane with a 32 to 1 mix with 25-26 degrees of timing and turn it to 7k with my stock fly wheel. I have the factory switch boxes (from the 200) and no rev limiter. Do I have it right? Thanks again guys. Just don't want it to come apart also!!

Can I start out with the .092 and lean out untill I don't see a rpm increase and richen bacK up .002?

[us1]

Thats what I do but I would check the EGT guages and plug color to make sure its right.

[wrechin2]

Us1 I don't have pyrometers on it. I can only rely on color. Should it be tan on the pistom or black with a wet spot on it? Thanks again.

[us1]

If tis running right it should be tan and black on the pistons and wet by the intake ports.

[wrechin2]

I will run it with .092 in all 6 cylinders right and go from there.
Thanks again US1