How to Increase Horse power

(da_bomber) · (da_bomber) **Join Date: Aug 2008** 08-01-2008, 8:14 AM

Good Morning All!
Does anyone know how to get more Horse power out of a PCM 330 Excalibur? Im looking to get approx 15 more Horse Power?

(denverd1)

That engine is pretty efficient for a 5.7L. Would a different prop get you there?

(da_bomber) · (da_bomber) **Join Date: Aug 2008** 08-01-2008, 8:33 AM

I was thinking of changing the prop but then i would lose topend, so if i could add approx. 15 Horsepower then i could get what im looking for with out jepordizing the Boats top end

(murphy_smith) · (murphy_smith) **Join Date: Dec 2005** 08-01-2008, 8:40 AM

Why do you care about top end...Are you barefooting or just putting unjust stress on yuor motor.

(magic) · (magic) **Join Date: Mar 2002** 08-01-2008, 8:42 AM

what are you trying to do that a new prop won't solve? 15 more hp is about 4-5% gain and where do you want it (low end top end?)

(gti2lo) · (gti2lo) **Join Date: Nov 2005** 08-01-2008, 8:46 AM

Little NX kit with a 50 shot never hurt a small block V8.... Hell give it a 100 shot.. sac it down...

(da_bomber) · (da_bomber) **Join Date: Aug 2008** 08-01-2008, 8:49 AM

Sean,

Im looking for additional low end with out jeopordizing the top end, im not looking to go fast but i do not want to lose what i have on the top end

(da_bomber) · (da_bomber) **Join Date: Aug 2008** 08-01-2008, 8:55 AM

Greg,
are you refering to Nitrous?

(jarrod) · (jarrod) **Join Date: May 2003** 08-01-2008, 9:03 AM

Prop changes work wonders.

You won't get noticeable power increase from anything you bolt on. No substitute for cubic inches and compression imo.

(da_bomber) · (da_bomber) **Join Date: Aug 2008** 08-01-2008, 9:06 AM

Jarrod,

Do you have any recommendations for props im looking for explosiveiness out of the hole with out jeopordizing the top end so much

(jcush313) · (jcush313) **Join Date: Jun 2008** 08-01-2008, 9:08 AM

just buy a jet boat if your worried about top end! there is no need to go over 25 anyway!

(blownc6) · (blownc6) **Join Date: Aug 2004** 08-01-2008, 9:18 AM

Jarrod is 100% correct, you'll never notice an extra 15 ponies, if you want to get out of the hole better the prop is your friend. Give ACME a call, nice guys , very helpful.

(denverd1)

you could get a low-end prop with a higher cup. should give you a little more top end than a normal stump-puller type prop.

50 shot = head gasket job

a mild torquer camshafts might help, but I doubt you'll want to do that.

(chpthril) · (chpthril) **Join Date: Oct 2007** 08-01-2008, 9:31 AM

x2 on ACME

(denverd1)

besides these boat only run 45'ish. How fast you trying to go???

(cavlxenvy) · (cavlxenvy) **Join Date: Aug 2007** 08-01-2008, 9:44 AM

Be careful about the year of your boat and what you bolt on from a warranty standpoint. It can also change engine calibrations that work with the computer system and give many engine alarms/warnings.

(magic) · (magic) **Join Date: Mar 2002** 08-01-2008, 10:46 AM

an other vote for an Acme Prop. I had one on my old boat, gained a lot of hole shot and kept my top end.

(guido) · (guido) **Join Date: Jul 2002** 08-01-2008, 11:15 AM

ACME...

I changed the prop on my sanger. Gained hole shot and picked up a few MPH on top.

(chas) · (chas) **Join Date: Feb 2002** 08-01-2008, 1:46 PM

ACME

Great hole shot with 1800 lbs and was still just shy of the 50 mph mark on my Sanger 210

(johnsvt) · (johnsvt) **Join Date: Dec 2006** 08-01-2008, 1:51 PM

New prop...I like OJ personally.

(jarrod) · (jarrod) **Join Date: May 2003** 08-01-2008, 2:21 PM

you may have to play around with a few props. We went through 2-3 props before we found the right one. Now we've got great holeshot, and we were able to keep the RPMs below 4K at riding speed. It's going to depend on the boat, how much weight you run nomally. Different goals through, we've never been interested in top end.

(da_bomber) · (da_bomber) **Join Date: Aug 2008** 08-01-2008, 5:51 PM

Jarrod,
i usually run approx. 800 LBs of ballasts and i usually have 3 adults and 1 child in my boat, i spoke with the boat manufacturer today and he recommended a 3.5" x 16" prop i checked my prop today and this is what is on the boat right now. so i think i may need to go to a 3.5 x 15 or go big 4.25 x 4.25 to blow out of the water(HoleShot)

(rallyart) · (rallyart) **Join Date: Nov 2006** 08-02-2008, 11:25 AM

Craig, you need to put more air into the cylinders to get more hp.
You can do that by increasing displacement, or changing the cam, or chemical forced induction like NOX, or turbo or super charging.
You can also reduce parasitic losses by using low friction fluids and different pulley sizes or lowering hydro drag.
15 hp is a lot to get by little things, You also need a lot of power to increase you top end speed. It's pretty special to have a tournament style boat that does over 50 mph.

(clubmyke) · (clubmyke) **Join Date: Aug 2004** 08-02-2008, 12:26 PM

get a acme prop or a bigger motor (or both)

(rio_sanger) · (rio_sanger) **Join Date: Apr 2007** 08-02-2008, 12:49 PM

330 hp out of 350 cu.in. is pretty darn good as it is.

I dropped one and a half inches in pitch, and went from a 4 blade to a three on my 330 Black Scorpion. I got better hole shot, and the top end stayed about the same. But as everyone else says, who cares about top end?
If you just want to go fast, a towboat is really not your best choice.