I have no idea... I've never seen a mercury 5.0 280 hp engine, but his #'s sound impressive with that kinda of weight, how fast is he getting??
5.0 Rpm
I have a friend that just got a 23' Larson BR boat. When he runs it at WOT the rpm goes 5400 to 5500 rpm with his 2 kids , wife and him with a full tank of fuel. The motor is a 5.0 merc 280hp.It has a 3 blade 19 pitch aluminum on it now. What prop/size should it have on it? or where should the rpm be for that motor? is 5400 or 5500 rpm right for that motor?
1 - 16 of 16 Posts
Should be 4600-5000 RPM's I would try a stainless 23P if his tach is accurate. The most powerful 5.0 Mercury put out was 260HP.
That could be it. I was not sureMkos1980 said:The most powerful 5.0 Mercury put out was 260HP.
He said it was doing 50 mph gps. I was not there so I can only tell you what he told me.Fyhr Factor said:I have no idea... I've never seen a mercury 5.0 280 hp engine, but his #'s sound impressive with that kinda of weight, how fast is he getting??
Very good performance from a 5.0 in a 23ft boat. I'd love to turn those rpms's with a 19 in my boat. Means theres alot left in prop changes. I was doing 53 at 4400 RPM with a 21 when it was the stock 270hp 350 Mag.
The 5.0 260 Mercs sound impressive.
Thats what I told him.RSCHAP1 said:The 5.0 260 Mercs sound impressive.
But I just had to ask so I could help him out.
Hey Doug, you been getting out lately?
I don't think any BLACK motors are rated for more than 5k RPMS.
Little bit, I will be out Friday morning 2 head 2 the inn.SINGLE SCREW 32 said:Hey Doug, you been getting out lately?
Yea i hear ya.as long as the grass keeps growing i'll be out as wellheading to the beach this weekend but hope to be out all 3days on the 4th. Hope to catch up to ya soon.SS32
I want to try to catch up with you at Lloyd's one day.
might be worth checking the tach....
In factory trim, that engine should be running out of cam around 5000... and should be well past peak hp at 5500...
In factory trim, that engine should be running out of cam around 5000... and should be well past peak hp at 5500...
and the 260hp/305 is efi and computer controlled so Im pretty sure it has a rev limiter as well. Could be wrong though..
I think your right. I think the rev is set at 5150ish.
1 - 16 of 16 Posts
- This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Powerboat Forums at SpeedWake
A forum community dedicated to Powerboat owners and enthusiasts. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more!
Full Forum Listing
Explore Our Forums
Recommended Communities
