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540 cam selection ???

Old 05-15-2004, 05:04 AM
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RLW
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For my 540, my engine builder went with a custom grind from Comp.
He opted for 236/[email protected] with .630/.635 lift and a 112LSA.
I am running AFR 305 heads with CNC porting. 9:1cr. Merlin single plane with Nickerson 1050. Stainless Marine Exhaust with long wet pipes that dump just inside the transom, at the tip. Hopefully dyno next week.
Russ

Last edited by RLW; 10-02-2004 at 03:14 PM.
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Old 05-15-2004, 11:43 PM
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Default Re: 540 cam selection ???

RLW thx for the info... is that cam considered mild or wild for your application? i'm really leaning toward reliability i 'd be happy with 500 hp.... or maybe even alittle less... something that has a good idle,and built to last...
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Old 05-16-2004, 09:35 AM
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Default Re: 540 cam selection ???

You need to talk to RMBuilder who is a member of OSO. Send him an e-mail at
[email protected]
His name is Bob Madara. He has developed a business that specializes in Marine Valvetrain Components. He is quite brilliant in that aspect of engine technology.
The key to good reliability is to install quality parts and to have a qualified engine builder that knows the difference between a marine engine and automotive applications. It is worth the added expense on both fronts.
Russ Withiam
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Old 05-17-2004, 12:33 PM
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Default Re: 540 cam selection ???

XCAV8,
Depending on the head upgrade you are planning, we have a cam/spring package designed for the 540. This particular grind was designed around the CNC AFR head combination which has a very good I/E ratio in the range of 77%-81%, hence the short split duration. Because these are custom grinds, adjustments can be made depending upon the flow numbers of the head package you choose. With the premium springs it is very durable, reversion free and will exceed your target power.
Max RPM 5500-5600
Cruise RPM 3300-3500
Dur @ .050 233 intake and 235 exhaust
Lift 600 intake and 612 exhaust
Lobe separation 112
intake centerline 108
Bob
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Old 05-17-2004, 09:17 PM
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Default Re: 540 cam selection ???

Originally Posted by rmbuilder
XCAV8,
Depending on the head upgrade you are planning, we have a cam/spring package designed for the 540. This particular grind was designed around the CNC AFR head combination which has a very good I/E ratio in the range of 77%-81%, hence the short split duration. Because these are custom grinds, adjustments can be made depending upon the flow numbers of the head package you choose. With the premium springs it is very durable, reversion free and will exceed your target power.
Max RPM 5500-5600
Cruise RPM 3300-3500
Dur @ .050 233 intake and 235 exhaust
Lift 600 intake and 612 exhaust
Lobe separation 112
intake centerline 108
Bob
thx bob , not sure which heads i will go with when that time comes, question is will that custom grind work well with the 049's i have now???
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Old 05-19-2004, 09:49 AM
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Default Re: 540 cam selection ???

Xcav8
I could not suggest that particular grind with your 049 heads. Custom grinds are designed specifically with the particular airflow package you are currently using. As Jim V correctly pointed out the 049 heads need to be crutched with additional duration due to the less efficient ports. Also the short I/E duration split is designed around a very high I/E ratio that is not available in the 049 head. There are custom grinds that will work with your current package, but they will then be less than optimum when you upgrade your heads. The advantage of going with a custom cam package over a shelf grind is that it optimizes your individual combination.
Bob
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Old 05-19-2004, 11:01 AM
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Default Re: 540 cam selection ???

I totally agree with Bob 100%. A well planned combination is the way to go.

Chris
 
Old 05-19-2004, 11:45 AM
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Default Re: 540 cam selection ???

I use a Lunati 54899 RRBI 240-245
valve lift .612 intake .612 exh.
.050 duration 240 intake 245 exh.
lobe centre 110 intake 118 exh.
lobe lift 360

use the imco power flow plus with custom risers as a wet system no problem with reversion is a comfortable cam at the dock
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