Finally made it to the dyno!!!
 

After months of research, planning and building, our new engine finally made it to the dyno last Saturday.

First of all I need to thank those involved and hopefully I don't forget anyone....man I don't even know where to start!!!

My wife for her endless patience and understanding of my boating disease :)


NVR Racing in Butler WI, Scott and Tom, who did all the machine work, final assembly, and dyno test. when I called Friday morning the shortblock wasn't even assembled yet and the heads were on the milling machine Friday night :eek:
But they pulled it off and we made some good power on the dyno on Saturday. (after we fixed my leaky Demon fuel line :( )


Rmbuilder took the time to listen to what I was after and spec'd a cam, lifters, and springs to suit my needs to a "T"

In the process of deciding exactly what to build I spoke with Bob Endress, Dustin Whipple, Tyler Crockett, Doug from Barry Grant, Ray at Raylar, and quite a few others in the industry who were more than happy to give me some insight into what works and what doesn't


so, what I ended up with is:

502 block bored .030 over to 4.5"
JE pistons, wrist pins, and rings.

Stock crank turned .10 .10
stock connecting rods resized with ARP bolts.
Balanced Rotating assembly

088 casting GM iron heads custom ported at NVR racing
with Manley 2.25 stainless intake and 1.9 inconel exhaust valves.
118 cc chambers
8.9:1 compression
ARP head bolts.
Gasket Specialties head gaskets

Custom Ground Cam Motion cam (spec'd by rmbuilder)
Intake .594 lift 228 degrees duration at .050
Exhaust .600 lift 232.7 degrees duration at .050
112.2 degrees lobe separation
Morel hydraulic roller lifters
Crane gold roller rockers

Edelbrock Victor Jr intake port matched to heads
Demon Mighty Marine 850 carb with #80 primary and #88 secondary jets. The only adjustment required on the carb AT ALL was idle speed!!! The jetting was right on the money!!

Modified Mercruiser magnetic trigger distributor
Crane Ignition box using their #6 advance curve with 14 degrees initial timing advancing to 34 degrees by 2500 RPM
Autolite AR135 spark plugs
Mercruiser plug wires .

The engine was dyno'd with dry exhaust turning the water pump
We originally used the Dyno's MSD 7 box then switched to the Crane ignition for the last two pulls and did not see ANY loss of power whatsoever.

I still can't get over how well this combination turned out

To Everyone involved THANK YOU


Doug and Marie Schiller :D :D :D :D :D

Standard corrected data for 29.92 inches Hg 60 F dry air

RPM---Torque--Horsepower

3500----580.9----387.1
3600----580.0----397.6
3700----592.0----417.1
3800----576.7----417.3
3900----572.1----424.8
4000----584.7----445.3
4100----588.3----459.3
4200----597.7----478.0
4300----604.8----495.2
4400----608.8----510.0
4500----608.9----521.7
4600----606.9----531.6
4700----609.8----545.7
4800----610.5----558.0
4900----610.2----569.3
5000----602.2----573.3
5100----591.4----574.3
5200----585.4----579.6
5300----579.5----584.8
5400----578.7----595.0
5500----563.1----589.7
5600----547.5----583.8
5700----515.5----559.5
5800----475.0----524.6

It's going in a Checkmate 230 Enforcer..Dry weight of 3200lbs propped for 5500 rpm :evilb: :evilb:

Re: Finally made it to the dyno!!!
 

Great looking numbers especially in that sweet spot of 4400-4800RPM. Looks like you've got that motor set up to have the power/torque right where you want it!!! Way to go :evilb:

Re: Finally made it to the dyno!!!
 

Those are some great numbers !!! Makes me feel really good about the motors I am building. Almost identical to yours except massaged Edelbrock aluminum heads and fuel injection.
And to add to that a Whipplecharger at 6 psi.

I am hoping for 750 hp and from your numbers it looks like I'll be there or better.

Good job !!!!

Re: Finally made it to the dyno!!!
 

That's one of the reasons I left the compression ratio where it is.. I had thought of adding a Vortech supercharger in the future. :evilb:

Now after seeing how well it ran I think I'll leave it as-is for this boat....after all, the hull length is only 21 feet :D :D



Doug

Re: Finally made it to the dyno!!!
 

Congrats----nice, flat torque curve! Also, those are some really respectable HP numbers---especially from a GM cast iron head!!! I also believe this shows that a good cam selection can really bring it all together very nicely in an engine combination.

Re: Finally made it to the dyno!!!
 

That's alot of motor for that boat. You will be running well into the 80's knocking on the 90's. Be careful and make sure you have hydraulic steering on that bad boy !!!

I'll let you know what I end up with HP wise. I should be on the dyno in about 3 weeks.

Re: Finally made it to the dyno!!!
 

I did install XS Performance dual ram full hydraulic steering while I had the engine out.

So now all I have to watch out for are your "Bigwavz" :D :D


Definately let me know how your engine turns out!!


Doug

Re: Finally made it to the dyno!!!
 

your the guy I told about the steering right? nice job on motor I didnt do anything to mine slow winter for work couldnt afford it this year hopefully next

Re: Finally made it to the dyno!!!
 

Nice power that will be a great motor in that boat.
Hunter

Re: Finally made it to the dyno!!!
 

nice power :D

Re: Finally made it to the dyno!!!
 

I would think special thanks would go out to the great guy who sold you the main engine components! :D :D Doug, do you need the engine hoist this weekend? I've got that alignment tool here! Steve

Re: Finally made it to the dyno!!!
 

Any time you can tickle 100% VE with a package like this you know you got the combination right. The jetting seems lean, but maybe with the different exhaust in the boat this will be OK? Yes, this is a perfect engine for a centrifugal supercharger.

Re: Finally made it to the dyno!!!
 

Nice numbers! That's gonna be a lot of HP for that boat. Drive carefully and work your way up to WFO speed... doing it on the first trip out... well you know. First boat wake could be the last boat wake at those speeds.

Re: Finally made it to the dyno!!!
 

I'll definately have to check the plugs the first time out, but we're thinking the wet exhaust and mufflers should richen it up some...

And yes, Steve, Thank You for selling me the engine :drink:



Doug

Re: Finally made it to the dyno!!!
 

Impresive #'s !! Do ya have any flow # on the heads?

Re: Finally made it to the dyno!!!
 

Yes I do, They're on another thread in the tech section.

Head flow info
Doug

Re: Finally made it to the dyno!!!
 

Now that it is mid summer and I am sure you have been out......How does the boat run? which prop worked best? top end? what mods to the merc mag trigger did you do? What would you have done differently?

Thanks very much.

Great thread..

Re: Finally made it to the dyno!!!
 

The boat runs absolutely EXCELLENT!!!! I wouldn't change a single thing on the engine!!!! :D :D

Right now I am running a labbed 28 pitch Bravo I and am seeing 79 mph at 5200 rpm :evilb:

...I do need to get my rpms up to around 5500 on the top end as that's where my peak hp is, and maybe I'll see a little more speed.


I had sent my prop out to be worked on some more and was told that by taking .020" off of the trailering edge my cruise rpm wouldn't change, only my top rpm would.....Well, my cruise slip went from 10 percent to about 20 percent and I actually lost a little in top speed while only gaining 100 rpm.. :( so I had to send it back to hopefully get it re-adjusted to where it was as I love being able to cruise at 53-54mph at about 3400 rpm..I think eventually I'll have to try either a 26 or 27 Hydromotive Quad IV X or maybe even a mirage plus..

As far as the distributor, all I did was cut the wires going from the pickup to the module and feed them out the bottom to hook to my Crane box.

The only other issue I've had is that with the Keith Eickert manifolds and the GGB mufflers I was at 94db at idle!!!! :eek:

Our noise law in Wisconsin is 86 db :( I tried adding a set of inserts along with the mufflers and only got down to 92 db, so I took them back out and put on a set of down tubes instead.

I will be testing them out this weekend :drink:

Doug

Re: Finally made it to the dyno!!!
 

how is your steering working out for you

Re: Finally made it to the dyno!!!
 

The steering works pretty good, while underway you can just let go of the wheel and the boat will stay in the direction you pointed it even in rough water....

The only issue I'm still working on is it is a little hard to steer at idle which makes docking a bit of a pain...


Doug

Re: Finally made it to the dyno!!!
 

Sounds like a great package. My buddy has a 24 Enforcer with 468 with a 420 Megablower, nickerson carbs, and CMI headers. Very fun boat to ride in and drive.

Re: Finally made it to the dyno!!!
 

Boatally Insane sounds like a good running package .congrats :drink: