Originally Posted by Uncle Dave

The dyno room is an important part of any real rebuild as that's where you determine weather your guy did his work and prior homework before or you are some unknown project- or guesswork.

Lots of things to go wrong in a rebuild like yours. I'm not trying to freak you out just help share a lifetime of experiences like this.

Another thing for me is the dyno room is where the engine builder gets his final payment from me. Unless he is installing it in the boat himself.

Until established in the dyno room otherwise- claims mean nothing. Results mean everything.

The dyno should be the "feelgood moment" between you and your builder with a trusted third party helping the both of you figure it out. Because you will be making changes and testing them and when the needles finally swing into where you expect them to be and the roar fills the room you know you got it.

It's not only worth every nickel you'll have fun and learn a lot in one day.

Uncle Dave

Originally Posted by Diego9040

Dave,

In this case he is also installing them and by the way he is giving me 1 yr warranty on parts and labor.
Anyways, what is a fair rate for a day at the dyno?

Originally Posted by sprink58

I will be watching this thread closely...my engines are similar and our boats are close in size and weight.

I believe that cam is a flat tappet model...did you consider Comps roller?

I used Comps Xtreme Marine XR264 HR12 Hydraulic Roller Camshaft in my two 355's

Lift: .488"/.495"
Duration: 264/270
RPM Range: 1000-5000

Mine made 400 @ 5100 and 435 ft. lbs at 3200

People I have talked to swear by these rollers...makes a huge fat TQ curve.

As for dyno $$ ...call Chief and or Cobra...also Doller in Hollywood has one I think.

I might be test running engines this weekend if I can sort out some cooling system issues.

What drives are you running?

Originally Posted by Uncle Dave

Depending on the operator and the sophistication of the room 5-700 bones.

Your guy sounds solid I hope your project goes well.


Uncle Dave

Originally Posted by Diego9040

My guy has been building engines for over 30 years , seems very honest and patient as well , I made lots of changes from what he offered me originally . I will also have MSD ignition package. Does this MSD thing really work in improving performance?

I keep you all posted. Thanks again.

Originally Posted by dereknkathy

merc's thunderbolt is a very solid, dependable marine ign that has an advance curve that is about optimal for boats. i don't think you will see an improvement from the MSD's. let us know what kind of speed-rpm numbers you get, and what props...

Originally Posted by Uncle Dave

I visited doller offshore last year when on the sunny Ilses to Bimini trip.

Mindy is a good business woman and has competent help.

Id trust them.


Uncle Dave