what is the weight of your boat?
Fresh dyno sheet on the first engine of a pair of mild 9 to 1 540's going into a new 380 PQ with XZ drives. How fast do you think its going to run? The dyno #'s are with the engine fully accessorized and ready to drop in the boat.
Last edited by rpm; 09-24-2002 at 04:37 PM.
what is the weight of your boat?
Last edited by timucin; 09-24-2002 at 05:55 PM.
83 my guess
WHAT ARE THE CAM SPECS. "THIS IS VERY IMPORTANT"
HOW HEAVY IS THE BOAT
HOW WAS THE CAM PUT IN (WHAT DEGREE?)
BOTTOM END POWER IS JUST NOT THERE FOR TORQUE OR H.P.
NOT BEING CRITICAL ,REALLY JUST WOULD LIKE TO HELP IF POSSIBLE
Ray, I think you are very close, I'm looking for 85. Engine #2 will be on the dyno Friday, tailpipes are being made for the CMI split tubes as we speak. If all goes well I'll have your answer next weekend or shortly thereafter.
Bobby, The boat weighs 9000 lbs. Please explain what you mean by "bottom end is just not there for torque or hp"? A/F ratios are a little strong, but a fat motor is a HAPPY motor and I'm pretty sure that 600+ ft/lbs of torque in the cruising range (35-3800 rpm's) will turn 32" Labbed Bravos just fine. Torque and HP match @ 5300, that should help keep drives together as well.
Its a .580/580 lift cam with 228/234 duration on a 112* centerline installed straight up in a 9 to 1 hydraulic roller engine.
It was never designed or intended to be a race engine, but an everyday turn the key reliable, dockable setup that a lady could drive, yet perform respectively when needed. We expect it to idle at 850/900 in neutral and 750/800 in gear. I'd be interested in your advice on how to make this setup work better. WOT is 55 gal/hr. Thanks
640tq and 640hp- not too bad. hpand tq will by defination = at 5250 rpm. Like you said a little rich, lean it out .5 and improve your power. 55GPH ouch!. Is that -2 on the boost or a 2inch vacuum? maybe needs more carb.
Marty, neither boost or vac were hooked up, not sure why the default shows -.2. It has plenty of carb, its a 1050 dominator and well within CFM parameters. I'm actuall pretty happy with 55 gph to make 640 HP - at 3800 its only using 17 gph ( no secondaries yet) and makes more torque than a 500 EFI at WOT and using way less fuel. Once the engines are in the boat, we'll fine tune the carbs, but I think we are within a jet size or two. The extra 10 HP that we leave on the table doens't mean didley to us at WOT, it wouldn't even be 1 mph and no sense putting it on the edge for a family cruiser. Thanks
Great torque curve.
Hey even if it ain't broke it's still fun to tinker with it.
I agree with Tinkerboater. I think you did an excellent job with that engine in my opinion! Especially with such a small cam and the for a 540" engine. You might try a 950cfm Holley vs the 1050 and see what you get like idle quality, GPH, as well as TQ/HP numbers. Very impressive numbers so far I think! Thanks for sharing.
Can't get over the size of that cam for the numbers you've gotten! Very good! What brand is the cam?
Last edited by KAAMA; 09-24-2002 at 10:03 PM.
sounds like a nice setup there, I would say when dialed in 86-87 mph
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