All this talk about drives. Who uses what for drive oil ? Thats a big factor. Ive tried Amzoil and it expanded out of the overflow can where merc oil didnt. Dont know if thats good or bad but im back to merc with the new drive. Thinking about going to mobil 1 synthetic. That has to be worth a few since my drive hold like 10 quarts.

Kendal HP (Power) varies as a function of RPM since it is a calculated value from Torque and RPM.
The Torque produced by the engine is what is depending on the power curve of the engine.
In this case with 5500 rpm being the red line, your statement is probably correct, the engine does likely make a little more Torque at 4000 than at 5500. For sure, it makes a lot more Power at 5500rpm.
Your also saying that spinning a 28p prop at 5400 engine rpm (3600rpm at the prop) creates less load on the drive than if you spin a larger prop i.e. 30p or 32p at the same rpm; also true.

My statement was that a 28p spinning at 4000rpm (6000engine rpm) does not likely create less load on the drive than a 32p spinning at 3467rpm (5200 engine rpm); Bigger prop less rpm but propotional to the smaller prop at higher rpm... Same Speed as a Result...

We are not debating the same thing...:ernaehrung004:

K, your suggestion that G holds the power back to the level he had before is a little strange to me.
Don't you have like 750HP hooked to an XR? I know you put the hammer down from time to time.
Superbabi turned a 29p B1 at 5400 engine rpm with the 600sci.
No way could one of us get behind the helm after bolting in a new engine and not run it...:party-smiley-004:
Gary knew the risk of bolting 800HP to his 280hour old XR and I'm sure he's not surprised it went boom. Now with the new XR drive he'll see how much his stomach and wallet can take before he holds back with his throttle hand...
My guess is that he has already hammered it again...:eek:

Does this mean we're going to start thinking about surface drives again? ;)

You guys are Fuuunnny!:D Gary, just run it like ya stole it! (almost).

Zup, I run Merc oil.

Wise Guy !!! lol lol

Who luvs ya !

Pat, first part of your statement, very true, I did run hard. I also knew my XR was tired. We just put another 5 hours on the new upper and new parts lower, I have been running only 3000-4000 max for the time being.:( I guess we will have another winter project ( New Drive ). :D

[QUOTE=Pat McPherson;2619587]K, your suggestion that G holds the power back to the level he had before is a little strange to me.
QUOTE]

I never said go back to the power he had before

[QUOTE=Pure Energy;2621676]Nor did I say you did.

So K, are you going to be out east on the 26th?

http://www.offshoreonly.com/forums/s...d.php?t=187738

A little late for you G, but interesting...