Too low RPMs hurt?

C

CODE-1

Seaman Apprentice
Joined
Jun 24, 2002
Messages
32
I've heard that too high RPMs can hurt a motor and understand that you may be reving it to an early death running it WOT. But does it cause any problems by not being able to reach the rated max RPMs at WOT? Or any problems not going to WOT but cruising 2/3 throttle?<br /><br />Thanks, Ron
 
M

Mikedg

Petty Officer 2nd Class
Joined
Sep 3, 2002
Messages
131
Re: Too low RPMs hurt?

Code 1<br /><br />If your engine cannot reach the manufacturers specified RPM for WOT you will harm it. By being improperly propped you are overloading the engine.
 
SpinnerBait_Nut

SpinnerBait_Nut

Honorary Moderator Emeritus
Joined
Aug 25, 2002
Messages
17,651
Re: Too low RPMs hurt?

CODE-1, post this in the engine section along with type ob, hp etc. for more answers.
 
CalicoKid

CalicoKid

Lieutenant Commander
Joined
May 27, 2002
Messages
1,599
Re: Too low RPMs hurt?

Cruising at reduced throttle, however, will not harm your engine any.
 
M

MartyTn

Petty Officer 2nd Class
Joined
Nov 3, 2002
Messages
108
Re: Too low RPMs hurt?

This is a question I've wondered about also, so let me ask it since it's the same question with one more variable -- I changed from a power prop to a cruise prop on my 17' SeaRay with '89 Merc 100HP. I love the prop's performance, it's got good hole shot power and good cruising speed. To get full recommended WOT however, it needs to be trimmed exactly right. Now, when I'm just cruising - usually around 3500rpm or so, I get it trimmed well, but probably not exactly. The motor feels great, but could I possibly be lugging it and hurting it at this lower speed if it's not trimmed exactly ??<br />Many Thanks, Marty...
 
JB

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: Too low RPMs hurt?

As Spinner-bait-nut pointed out, this is an engine question. The Forum title says, "not engine questions".<br /><br />Because I have no idea what sort of engine Code-1 has, I will just move it to I/O and Inboards.<br /><br />Good luck, Code-1, but give us some info to go on, please. :)
 
C

CODE-1

Seaman Apprentice
Joined
Jun 24, 2002
Messages
32
Re: Too low RPMs hurt?

Thanks guys for your response. Appreciate it.
 
G

geriksen

Petty Officer 2nd Class
Joined
Nov 15, 2002
Messages
111
Re: Too low RPMs hurt?

You want your engine to run at or near it high reccommended limit with the throttle wide open. If it cannot get there the engine will be lugging, the timing will be over advanced for the rpm and it will start pinging. You will not be able to hear this at the helm, but you will be steadily burning up the engine. At lower throttle settings it is not as critical but the boat should be propped correctly anyway to run at it's best,
 
C

CODE-1

Seaman Apprentice
Joined
Jun 24, 2002
Messages
32
Re: Too low RPMs hurt?

Thanks geriksen, that's what I was looking for.
 
S

SHelms8844

Cadet
Joined
Nov 1, 2002
Messages
27
Re: Too low RPMs hurt?

OK, here is a dumb question...what exactly does WOT stand for? Told you it was dumb!
 
Bart Sr.

Bart Sr.

Lieutenant Commander
Joined
Jul 26, 2002
Messages
1,603
Re: Too low RPMs hurt?

Also known as WFO!!!!THANKFULLY AND RESPECTFULLY>>BART SR.
 
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