Thankyou RM Builder
 

I would like to thank Bob Madera aka RM Builder for specing the parts for my 540. I am really pleased. Dyno pull is with all accessories installed and blowing through Dana Marine Torque-flow exhaust.

Chris

I like the HP #'s from 4800 to 5900. that should pull some good #'s.Congrats , Bob is pretty sharp on designing a cam. He goes that extra info, unlike most cam manufactures,they usually don't ask much:(


Rob:ernaehrung004:

The numbers look really good. I would think, prop it for 5400-5500rpms at wot as the spinning it 400 rpms faster for 10 hp isn't worth it.

We were going for a very broad torque curve, and gave up some peak HP to gain it.

Chris

500 lbs of torque at 2500 rpm....awesome.

but what does the 400rpm do for speed,mine was gaing 10 hp per 100rpm from 5800-6100,I prop it to 6000 for top speed, the capibilty doesent mean you run it there .

Congrats!!! Those are some very respectable/impressive HP/TQ numbers with a "Manifold" style exhaust system!!!

CB...By the way, what size/brand of heads are you using? Also, was the engine dyno'd with or without sea pump, alternator, etc??? Was the exhaust system "wet" or "dry"? Just curious.

:cool-smiley-027:

Kamma,

AFR 305 CNC, Dana Torque-Flow exhaust - wet, vortex collector sized for 540, with sea pump, alternator, power steering pump, water pump. 9.6 compression, victor manifold, HVH 1 inch super sucker, 1050 Dominator, Jessel rockers, Morel lifters, Bob's cam.

Looking forward to putting it in the boat next week.

Chris

Great numbers. Similar HP/CI numbers as on my 502's with 305cc AFRs. You will enjoy the throttle response and mid range torque!!

I would prop to run high in the rpm band for acceleration and less stress on drive train.

OH yeah, forgot to mention Bob did my cams also!!

Bingo. An extra 400rpm is a decent increase of speed. + helps the drive live.



Darrell.

Thumbs Up to your engine builder who provided realistic dyno testing with all the externals/pullies, etc, on the engine---and your Dana exhausts....wet at that!

Remove all the externals, run it with car/dyno headers and it would be a 700+hp engine. :rolleyes:

Bob is top shelf!!!

He did the same for me a few years ago!!

Congrats. :D :evilb:

What do you think it would do to the Hp and Tq by adding headers in the boat? .... What type of headers?

Chris

SOME DRY STELLINGS, I would think would be good 1 to 2 mph on top end 40hp maybe more being dry.

Bob/RMbuilder did some cams/AFR heads for me a few years back as well. I run "dry" Stellings full length tubular headers in my 32' AT. It's really a combination of parts, but headers usually help. A friend of mine also has a 32' AT with 556cid/815 Supercharged engines,...ask Bob how well I can hang with him. Or ask him about how my boat compares with a stepped hull 36' Apache Vortec with supercharged engines supposedly making 815hp. ;)

Another big fan of Bobs work! He designed my entire valve train for me last season, made more power and idles much better than before. Great prices too!

Kurt

Bob Madera is a credit to our industry. This man is honest, knowledgable and very talented at putting together the right cobinations of pieces that make awesome motors. Congratulations! nice numbers!
This is why I keep pounding on OSO'ers with the "I'm gonna have a buddy build me a motor" syndrom to go to a "surgeon" when they need surgey and a "dentist" when they need dentistry! There both MD's but at that point the comparison stops!

Best Regards,
Ray @ Raylar