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Just for the 540" guys

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Old 10-19-2002, 02:33 PM
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Default Just for the 540" guys

What heads are you running,what cam( brand, dur. at .050, lift,lobe sep.) What intake. What HP are you seeing.
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Old 10-19-2002, 04:26 PM
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Steve if you start another set of motors Patty will KILL you!!!!I thought a cruiser was in your near future the way she talked this summer!!!!
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Old 10-19-2002, 05:01 PM
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No cruiser for at least a few years. If anything it may be a 35 ft cat with the engines from the SCARAB. Hey SHE is the one that is constantly telling me to open the exhaust up. She loves the sound of these motors. She loves the sound of high HP engines.
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Old 10-19-2002, 07:04 PM
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Steve/Tink,

Hey Listen Steve, don't listen to Dyno----he's just giving you a smoke screen to distract you from building those 540's. He's a 540 engine club wannabe! And if he can't have them right now he doesn't want ANYONE to have them.

My naturally aspirated 540's have Dart Pro-1 310cc fully ported aluminum heads, Dart single plane intakes, 950cfm Holley carbs, 9.5:1 comp ratio, Crower hydraulic roller cams 236*/244* @ .050" .610"/.612" lift on 114* lobes, 32* full adv timing and full length tube DRY stack headers. Roughly makes about 685hp @5500rpm and about 680 ft lbs of torque @ about 4500-4800rpm on Tom Earhart's dyno.

Dyno/Don, jyou know I'm just messin' with ya bro!
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Old 10-19-2002, 10:19 PM
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wake up Steve your dreamin again........
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Old 10-19-2002, 10:48 PM
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Default Not in the 540 club yet, but likely will be someday.

I have a cam spec from Erson, but it will likely be to large for most pleasure boaters. I will post it anyway. I will be shooting for 800 HP naturally aspirated in the 6000 to 6500 RPM range. That should be enough to get this little Baja into 3 digits. It will have my same fully ported 325 pro 1 heads with 2.3/1.88 valve dia. and will have 12.5 to 13.5 to 1 compression. The cam Steve Tanzi from Erson recommended is a solid roller with .731 gross lift, 278 intake duration at .050", and 286 exhaust duration at .050 and it will be on a 114 LSA. Probably not what you are looking for in a fast pleasure boat, but I am sure Tanzi would be able to help you select the correct cam for your application. (800)641-7920.
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Old 10-19-2002, 11:30 PM
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Hey Craig/Wette Vette,

What's the advertised duration on that cam? Are Erson Cams known for slow or fast ramp speeds? I like the slower ramp speeds (such as Crower) that are supposed to be easier on the valve train.
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Old 10-19-2002, 11:34 PM
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My isn't running yet but it is fully assembled, Dart 325 heads, ported with the same valves as "Wette Vette" and everthing the same as KAAMA. except the pipes.

What's up with that Mark , I thought you liked those 830cfm's?

Good luck "TB"

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Old 10-20-2002, 12:09 AM
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Hey Mike/Dabeezer,

Actually Mike, on the dyno we tried one of my 830's and then used one of my new 950's. This was a back to back test using these two different carbs. What we found was that the 950 didn't really make any more horsepower over the 830. In fact, the 830 in some RPM levels made MORE torque than the 950---maybe only about 3 or 4 foot pounds, but still that was kind of suprising to us. The 950 didn't really make any more power until AFTER 5400rpm on one of my 540's that we were testing. At 5500rpm, the 950 consistantly made about 16-18hp more than the 830cfm carb. But then for me, I plan on running at about 5400-5500rpm anyway. So in some ways I feel that the larger 950 may not have been a needed purchase.

There have been several people who are excellent with marine engine set ups that have told me on several occasions that my 540's really need a Dominator carb of 1050cfm. It might make a little more power maybe 10-15hp, but I'm not looking for every ounce of horsepower. I'm into a little more of the DRIVABILITY and IDLING scene---especially around the docks and when wind and water currents can be a wild card factor. It helps to be able to shift the engine from forward/neutral/reverse without it dying when manuvering in what can sometimes be a tense situation.

Both carbs I used were of the Holley HP series (NASCAR/Winston Cup) with no choke:

830cfm, double pump, annular discharge, mech secondaries, 4-corner idling.

950cfm, double pump, mechanical secondaries, 4-corner idling (NON-annular discharge)

So I think you're going to be fine with the 830cfm.

Last edited by KAAMA; 10-20-2002 at 12:12 AM.
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Old 10-20-2002, 08:56 AM
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KAAMA, the advertised duration on this cam is 304/312. Erson sells this cam for those who want a cam that is easy on parts yet still want big HP. With this cam spring and lifter changes will come every 50 HRS. My current setup is a comp 272/280 @ .050 with .714 gross lift. Springs and lifters need to be changed probably at 75 hrs. So far on the current setup I haven't had any trouble with around 25 hrs. When springs and lifters are needed I will probably get busy on a 540. With me that may be 2 more seasons with the 496.
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