Looking for 400hp on 383's
#21
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The dyno room is an important part of any real rebuild as that's where you determine weather your guy did his work and prior homework before or you are some unknown project- or guesswork.
Lots of things to go wrong in a rebuild like yours. I'm not trying to freak you out just help share a lifetime of experiences like this.
Another thing for me is the dyno room is where the engine builder gets his final payment from me. Unless he is installing it in the boat himself.
Until established in the dyno room otherwise- claims mean nothing. Results mean everything.
The dyno should be the "feelgood moment" between you and your builder with a trusted third party helping the both of you figure it out. Because you will be making changes and testing them and when the needles finally swing into where you expect them to be and the roar fills the room you know you got it.
It's not only worth every nickel you'll have fun and learn a lot in one day.
Uncle Dave
Lots of things to go wrong in a rebuild like yours. I'm not trying to freak you out just help share a lifetime of experiences like this.
Another thing for me is the dyno room is where the engine builder gets his final payment from me. Unless he is installing it in the boat himself.
Until established in the dyno room otherwise- claims mean nothing. Results mean everything.
The dyno should be the "feelgood moment" between you and your builder with a trusted third party helping the both of you figure it out. Because you will be making changes and testing them and when the needles finally swing into where you expect them to be and the roar fills the room you know you got it.
It's not only worth every nickel you'll have fun and learn a lot in one day.
Uncle Dave
In this case he is also installing them and by the way he is giving me 1 yr warranty on parts and labor.
Anyways, what is a fair rate for a day at the dyno?
#22
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I will be watching this thread closely...my engines are similar and our boats are close in size and weight.
I believe that cam is a flat tappet model...did you consider Comps roller?
I used Comps Xtreme Marine XR264 HR12 Hydraulic Roller Camshaft in my two 355's
Lift: .488"/.495"
Duration: 264/270
RPM Range: 1000-5000
Mine made 400 @ 5100 and 435 ft. lbs at 3200
People I have talked to swear by these rollers...makes a huge fat TQ curve.
As for dyno $$ ...call Chief and or Cobra...also Doller in Hollywood has one I think.
I might be test running engines this weekend if I can sort out some cooling system issues.
What drives are you running?
I believe that cam is a flat tappet model...did you consider Comps roller?
I used Comps Xtreme Marine XR264 HR12 Hydraulic Roller Camshaft in my two 355's
Lift: .488"/.495"
Duration: 264/270
RPM Range: 1000-5000
Mine made 400 @ 5100 and 435 ft. lbs at 3200
People I have talked to swear by these rollers...makes a huge fat TQ curve.
As for dyno $$ ...call Chief and or Cobra...also Doller in Hollywood has one I think.
I might be test running engines this weekend if I can sort out some cooling system issues.
What drives are you running?
Last edited by sprink58; 07-21-2012 at 08:41 AM.
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Depending on the operator and the sophistication of the room 5-700 bones.
Your guy sounds solid I hope your project goes well.
Uncle Dave
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I will be watching this thread closely...my engines are similar and our boats are close in size and weight.
I believe that cam is a flat tappet model...did you consider Comps roller?
I used Comps Xtreme Marine XR264 HR12 Hydraulic Roller Camshaft in my two 355's
Lift: .488"/.495"
Duration: 264/270
RPM Range: 1000-5000
Mine made 400 @ 5100 and 435 ft. lbs at 3200
People I have talked to swear by these rollers...makes a huge fat TQ curve.
As for dyno $$ ...call Chief and or Cobra...also Doller in Hollywood has one I think.
I might be test running engines this weekend if I can sort out some cooling system issues.
What drives are you running?
I believe that cam is a flat tappet model...did you consider Comps roller?
I used Comps Xtreme Marine XR264 HR12 Hydraulic Roller Camshaft in my two 355's
Lift: .488"/.495"
Duration: 264/270
RPM Range: 1000-5000
Mine made 400 @ 5100 and 435 ft. lbs at 3200
People I have talked to swear by these rollers...makes a huge fat TQ curve.
As for dyno $$ ...call Chief and or Cobra...also Doller in Hollywood has one I think.
I might be test running engines this weekend if I can sort out some cooling system issues.
What drives are you running?
I have been to Doller in Hollywood , very impressive place, will call them ,thanks .
I do have Bravo 1's
Thanks for your input.
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I keep you all posted. Thanks again.
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merc's thunderbolt is a very solid, dependable marine ign that has an advance curve that is about optimal for boats. i don't think you will see an improvement from the MSD's. let us know what kind of speed-rpm numbers you get, and what props...
Last edited by dereknkathy; 07-22-2012 at 06:57 AM.
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My guy has been building engines for over 30 years , seems very honest and patient as well , I made lots of changes from what he offered me originally . I will also have MSD ignition package. Does this MSD thing really work in improving performance?
I keep you all posted. Thanks again.
I keep you all posted. Thanks again.
I went through 3 engine rebuilds with a thunderbolt system from 91 that worked great for 19 years.
I just switched to the marine MSD 6 in my small boat and it works beautifully, but isn't any "better" than the thunderbolt system when it was working properly- at least that I can tell.
Unless you get the rev limiting version you wont see any diff.
Derekncathy is correct.
UD
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I am anxious to see those numbers, will post them as soon as I get the boat on the water, probably 10 more days...
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