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Old    Ian Gordon (16igordon)      Join Date: Jun 2013       03-12-2015, 7:35 AM Reply   
I've always wondered this and never received a concrete answer. I've heard people say as low as 3500 and as high as 5500. I usually keep it at around 4000-4500. What do you guys think?

We have a 400hp 383 hammerhead in our Malibu.

What is the max RPM you would suggest to run it at?
Old    Brian (Ewok01)      Join Date: Apr 2013       03-12-2015, 7:43 AM Reply   
What does the owners manual say? My PCM 343 manual says I should try to pitch a prop for max rpm of 5200 at WOT.
Old     (Bit)      Join Date: Aug 2014       03-12-2015, 8:52 AM Reply   
4000-4500 rpm when you do what? Cruising on the lake?
Old    Delta Force (wakebordr11)      Join Date: May 2001       03-12-2015, 9:15 AM Reply   
Quote:
Originally Posted by 16igordon View Post
I've always wondered this and never received a concrete answer. I've heard people say as low as 3500 and as high as 5500. I usually keep it at around 4000-4500. What do you guys think?

We have a 400hp 383 hammerhead in our Malibu.

What is the max RPM you would suggest to run it at?
I've never worried about over-revving the family boat with the stock prop. Wide open. 5000-5500 rpm should be no problem on these fairly custom and robust SBCs...
Old    Ian Gordon (16igordon)      Join Date: Jun 2013       03-12-2015, 9:19 AM Reply   
Yes when cruising around the lake. Would never get that high surfing or boarding.
Old    Mase (superair502)      Join Date: Mar 2010       03-12-2015, 10:22 AM Reply   
Totally fine. I see people run over 5k all the way back to the dock all the time. As long as you aren't near the redline I wouldn't think it would hurt anything at all.
Old    Mase (superair502)      Join Date: Mar 2010       03-12-2015, 10:24 AM Reply   
I would feel totally comfortable up to 5000 rpm with a hammerhead which is just a bored 350
Old    Josh M (dvsone79)      Join Date: Dec 2012       03-12-2015, 10:52 AM Reply   
I've never been above 4k. But I only board with an occasional surf set and I've never had my boat above 30mph. No need to. Weighted out at 23mph I am usually at 3400 on my 350.
Old    Todd (antoddio)      Join Date: Dec 2006       03-12-2015, 12:05 PM Reply   
I don't think propping the boat to achieve a certain rpm applies in the real world to wake boats. My boat could prob run 7000 rpm if the computer would let it. i propped down from 17.5 stock to 12 right now.
Old    Hey, You scratched my anchor! (bftskir)      Join Date: Jan 2004       03-12-2015, 4:41 PM Reply   
We've blown up 3 of those hammerheads they blew at 4500+
Old    Art (rallyart)      Join Date: Nov 2006       03-13-2015, 8:40 AM Reply   
Run in all day at 10% below the redline. Run it to the redline for 15 minutes if you want to. Just remember that you are putting distance on the engine when you rev it high so everything is more stressed and your fluids and tuning need to be at their best.
The most load on the engine is at full throttle at peak torque. Peak torque RPM is also where you get the best fuel use. Redline RPM puts the most stress on the connecting rod bolts and wrist pins but there should really be no issue with those on any small block Chevy at the RPM that boats normally run.

If Indmar Hammerheads blow up below their redline regularly in a boat, then Indmar does not build good engines. I think they probably do, but switch to Mercuriser or Ilmor if you are concerned.
Old    Timmy! (timmyb)      Join Date: Apr 2007       03-13-2015, 8:59 AM Reply   
Quote:
Originally Posted by antoddio View Post
I don't think propping the boat to achieve a certain rpm applies in the real world to wake boats. My boat could prob run 7000 rpm if the computer would let it. i propped down from 17.5 stock to 12 right now.
Sure it could. You'd have floating valves or broken valve springs, etc, but I'm sure you would be fine.
Old    Todd (antoddio)      Join Date: Dec 2006       03-13-2015, 9:02 AM Reply   
Well yea. It could only do it for a few seconds haha. But at WOT it would try to get up there if the computer didn't stop it.
Old    Nacho (denverd1)      Join Date: May 2004       03-13-2015, 10:35 AM Reply   
no rev limiters?

and a 383 is a stroked 350, not simply bored over. Its a mild stroker so those RPMs shouldn't be an issue
Old    Mikeski (mikeski)      Join Date: Aug 2003       03-14-2015, 12:30 AM Reply   
My PCM manual says sustained RPMs should stay at or below 4000rpm. Hammerhead internals are similar.
Old    Alex Yermolenko (alexair)      Join Date: Oct 2008       03-14-2015, 3:59 AM Reply   
See Chapter #4 http://www.indmar.com/Libraries/Manu...al_1.sflb.ashx
Old    Frank Berg (Iceberg)      Join Date: Dec 2011       03-14-2015, 8:50 AM Reply   
Since the internals of the engines are all the same, there is no one best engine manufacturer, as there is only one! The accessories and PCM tuning are the only differences, and some of those are the same as well. Sustained high RPM and load will shorten engine life, it is simple physics. As you approach the upper limit the wear increases exponentially, so depending on your red-line or what is suggested in your owner's manual, operation less than 20% of red-line will go a long way giving you many years of trouble free use of your GM Marine engine, adapted by the various engine suppliers.

I forgot that Ford has added an engine to the marine industry, but the GM engines are everywhere.
Old    J (Jmorlan)      Join Date: May 2013       03-14-2015, 8:53 AM Reply   
Speaking of the gm engines. Anyone know if the 5.7's are the older flat tappet or are they roller lifters

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