I was asked today if a loader could cause engine rpms to be lower?   I don't see how
but you guys are the experts so I told him I would post the question.

He changed cams to a supposedly better cam and lost 200 rpms.   It's a 460 berkeley 12je A impeller.

The only other thing he did was put on the loader.  I vote cam.

Opinions?  Tom??  

Yes, it is possible since a loader loads the motor harder than a rock grate.

x2

one change at a time, take the loader off and put the grate back on. the new cam may not be rite for the impeller

As said , an aggressive loader (worse if not "adjusted" ) can pull the motor down a bit and this is even more noticable with smaller HP  Tom

Does anyone have a picture of a smi-blocker or v blocker? I only have a rock grate loader, and a ramp loader, and when I swapped them out I had no rpm gains or losses

Heres our Semi pro open,Ill dig up some more pics for ya of my others !  Tom

Got a call a little bit ago.   It WAS the loader.  Interesting, now does that mean
trim more off the ramp??

If the keel line were right where the rock grate lines were then it was cut right on the button.
It's hard to tell the real keel line as the bottom of the hull starts to slope toward the jet opening.

He just cut it dead on where the bottom of the rock grate was. 

Pressure taps are a valuable "tool"  in diagnosing and adding/subtrcting underwater hardware (shoes loaders etc) recommend everbody give thought to them the infomation gives a way to anaylize vs expirimenting thus saving valuable lake trip time Tom

this is the suction Josh is prepping for my boat , the "e" in the pic below is also tapped 

kind of general for a lake boat but we'd like to see you making around 15/30 +- psi on the bottom and 15/30 +-( close to equal at the top maybe a little higher on top ), suction taps located just fwd of the WR  and then tune from that point. shoe depth (biting edge) , the depth of the loader horizontal blades below keel line and intake opening size affect more than just intake pressures they also can effect the overall handling of the hull That said while doing this its very important to observe  how it the boat feels, drive  and handles , Beware and pay attention to how the boat reacts when you "set it down" ,eg  "hooking" , "light a$$" end feel , on hard decel from speed, pay special attention to  the gauge readings on shutdown as well Tom