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The bigger issue with the ICL set at 112 is reversion. The exh valve is open for more piston downstroke degrees which can be trouble in wet exhaust apps. If that is not an issue I would attempt to prop it for the current hp max rpm, see what you get.
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What does the cam card say the INTAKE CENTERLINE should be? If you infact set the intake centerline (max. lift) at 112, that is not correct. The LSA is Lobe Separation Angle, it is determined from the intake and exhaust centerline numbers.
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I think that he has the crane 741 cam which should be a recommended 107 ICL.
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Originally Posted by Hard Charger
(Post 3389793)
Yes 112 Is the LSA which is also what the cam was degreed in at. I retarder the cam too much so I guess that makes me retarded. :lolhit: No wonder why I can't spin that prop. Dang this SUCKS!
Also this motor was not dynoed. Yes it should've been but I simply ran out of time. The machine shop put me months behind schedule. Summer was fast approaching, poker run, work load, etc. Anyways thats engouh excuses for now. Chalk this up to another lesson learned. Don't feel bad. My Machine shop had my block for 3 frickin months.. for about 3 days worth of work :angry-smiley-038: |
Its the same grind as a crane 741. I won't name names but the supplier did not include the cam card. I should have verified it regardless. A 5 minute phone call would've prevented this. The ICL should be 107, I'm at 112, 5 degrees of retardation. Now I get to pull the motor and spend 2 days correcting this phuck up.
Fun Fun |
Why pull the engine???? You should be able to pull the timing cover off and degreee it in properly in the boat.
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Update
The oil pan has to drop down in order to pull the timing chain cover. I dont think its possible to degree a cam with the motor in the boat. Maybe if you had a two piece timing chain cover.
I pulled the motor on Sunday and took off all necessary parts. Degreed the cam to 107 ICL. Glad I reset the ICL because I found signs of water reversion. Milky oil residue under the valve covers, top of heads. Next everything was put back together. The motor will be installed by weeks end. Will post update after sea trial. |
Update
Man its one thing after another. The motor is back in the boat with the cam degreed in at 107 ICL. Started the engine an ran it for a short time. Found water pouring out the bottom of the oil cooler next to the power steering nipple. Water is mixing with both the oil and power steering fluids.
New cooler and fresh oil should be here before the weekend. This build is down to the wire. Our poker run is only a week and a half away. |
Originally Posted by Sport 280
(Post 3389478)
Actually, 112 is not advanced. Most cams are installed from about 105 to 112 degrees after top dead center. 105 is considered advanced and 112 is considered retarded. About 109 is generally what is used in boat engines.
Now if the cam was installed before top dead center, then engine would likely not run or run very poorly. |
ok i did not read all three pages before i posted. After you get the cam in right you might play with a larger carb i have had good results with close to 1000cfm on similar combos although most will say it is to much carb. I have 2 496's in a 32 active thunder that i have 1050 dominators on , the motors made 640 at 5600 with the big carbs.
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