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:
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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!!!
Originally Posted by Bigwavz
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 !!!! 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.
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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!!!
Originally Posted by Bigwavz
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. 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
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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
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