Gas engine and Diesel of same specs.Pull the same.

I'm not the one stating opinions as fact about an engine I know nothing about. I was hoping you could enlighten me about the Merc 1350 with facts but all I got was baseless opinion. Then a diversion with the SB 350 and LS1.
Why does the little Cummins need to turn 5k rpm? HP? :B

And how exactly does this relate to a tow vehicle for a travel trailer?

You being the big gas man and know all there is to know, what does the valves start floating at on this nine liter motor? Fact is what I want. Do you actually know what valve springs it has on it? I do know that a small block 350 will turn 7500 with stock valve springs without floating them. A LS1 will also turn over 7000 on stock valve springs without floating them. When floating the valves the motor will begin to miss and will not gain anymore rpms but will not necessarily "self destruct".

With the stroke being smaller than the bore the motor it is capable of making more hp than torque. The numbers that you posted of the torque then they have the rpms dialed back for reliability.

As far as the "little 5.9" goes. This 5.9 Cummins turns 5000 rpms on the track.;)

Little 5.9

transamz9 wrote:


Exactly what facts are you wanting me to provide for you? That a gas motor will turn 9-10,000 rpms without floating the valves or a diesel motor that will run 15,000 hrs?

Turn on a car race on Sunday and watch it. 9-10,000 ain't squat. As far as 15,000 hours? Look at any big truck with 500,000 miles on it. I work on equipment that has well over 15,000 hours on it.

You made reference to this particular engine. Maybe you know something about it no one else does. I was interested in your source of information on it. That is exactly what I'm wanting you to provide. The 5.7L Hemi starts to float valves at 6300~rpm. The 5.9L Cummins starts to have problems at around 4200rpm. This particular engine weighs quite a bit more than the little Cummins pickup truck engine. I'm doubting that it can easily turn 10k rpm but prove me wrong and I'll concede. And where did you get the hours figure from on this particular engine. Just curious.

http://mercuryracing.com/1350/specs/

F1 engines are rev limited to 18,000 RPM. Used to be 19,000.

Hannibal wrote:

transamz9 wrote:

Hannibal wrote:

transamz9 wrote:


That is a boat motor and it is capable of turning WAAAY more than 5500 rpm's. It is governed at that for many reasons, warranty is one of them.

Even detuned, let's see if it will hold up for 15,000 hours.;)

At what rpm do the valves begin to float and the engine start to self destruct? Facts, not opinion. And why only 15,000 hours? Why not 60,000 hours?

There are gas motors that turn in the 9-11,000 range all the time and that's just 800 hp engines. I would think a motor with that hp should turn 10,000 easy.

Show me a gasoline engine with 60,000 hrs on it. That would be like 2,000,000 miles.

I didn't think you could back up your assertion with facts. :B


http://mercuryracing.com/1350/specs/

Exactly what facts are you wanting me to provide for you? That a gas motor will turn 9-10,000 rpms without floating the valves or a diesel motor that will run 15,000 hrs?

Turn on a car race on Sunday and watch it. 9-10,000 ain't squat. As far as 15,000 hours? Look at any big truck with 500,000 miles on it. I work on equipment that has well over 15,000 hours on it.

06Fargo wrote:

Hannibal wrote:

transamz9 wrote:

Hannibal wrote:

transamz9 wrote:


That is a boat motor and it is capable of turning WAAAY more than 5500 rpm's. It is governed at that for many reasons, warranty is one of them.

Even detuned, let's see if it will hold up for 15,000 hours.;)

At what rpm do the valves begin to float and the engine start to self destruct? Facts, not opinion. And why only 15,000 hours? Why not 60,000 hours?

There are gas motors that turn in the 9-11,000 range all the time and that's just 800 hp engines. I would think a motor with that hp should turn 10,000 easy.

Show me a gasoline engine with 60,000 hrs on it. That would be like 2,000,000 miles.

I didn't think you could back up your assertion with facts. :B


http://mercuryracing.com/1350/specs/

I have a useless fact to contribute to a thread about RV's:

I have seen Cummins and Cat truck engines come in for major overhaul with over 30,000 hrs.

I've seen 25K hours on several 7.3 PSD's (shuttle buses)...and over 18,000 hours on a gas V10!

6dot6 wrote:
lol this threads funny.

The Tow Vehicle forum is one of my favorites :)

Hannibal wrote:

transamz9 wrote:

Hannibal wrote:

transamz9 wrote:


That is a boat motor and it is capable of turning WAAAY more than 5500 rpm's. It is governed at that for many reasons, warranty is one of them.

Even detuned, let's see if it will hold up for 15,000 hours.;)

At what rpm do the valves begin to float and the engine start to self destruct? Facts, not opinion. And why only 15,000 hours? Why not 60,000 hours?

There are gas motors that turn in the 9-11,000 range all the time and that's just 800 hp engines. I would think a motor with that hp should turn 10,000 easy.

Show me a gasoline engine with 60,000 hrs on it. That would be like 2,000,000 miles.

I didn't think you could back up your assertion with facts. :B


http://mercuryracing.com/1350/specs/

I have a useless fact to contribute to a thread about RV's:

I have seen Cummins and Cat truck engines come in for major overhaul with over 30,000 hrs.

transamz9 wrote:

Hannibal wrote:

transamz9 wrote:


That is a boat motor and it is capable of turning WAAAY more than 5500 rpm's. It is governed at that for many reasons, warranty is one of them.

Even detuned, let's see if it will hold up for 15,000 hours.;)

At what rpm do the valves begin to float and the engine start to self destruct? Facts, not opinion. And why only 15,000 hours? Why not 60,000 hours?

There are gas motors that turn in the 9-11,000 range all the time and that's just 800 hp engines. I would think a motor with that hp should turn 10,000 easy.

Show me a gasoline engine with 60,000 hrs on it. That would be like 2,000,000 miles.

I didn't think you could back up your assertion with facts. :B


http://mercuryracing.com/1350/specs/