Ken what did Rob @ Marine Kinetics come up with ???

He is due back in today from his travels. I will post any updates.
Thank you

Cams
 

Well I have not been able to reach Bob. However I did talk to Joe Coretti who said do not go over 650 on the Lift with HYD rollor lifters. He said my duration should be about 245 -255 @ .50 and 650 with LS @ 114 and 1.7 Rockers.
What do you think?

**

That is the reason for the 1.8 ratio rockers, it keeps the cam lobe lift and the ramp speed down (good for hydraulic rollers) but puts the lift into the valve for extra air flow. I agree do not exceed .650 lift with hydraulic roller lifters.

I am running a Hyrdaulic now. .647/.647 and 252/262 @50. I dont know what my LSA is. I would say that what you have there is a good choice, but if you have dry exhaust i would throw some more duration in there.

Rudy fixed me up after loosing a brand new engine with only 19 hours that was built in Waukegan, IL. I picked the original builder because they offered a 2 year warranty but after having to pay $8K for a rebuild they have not stood behind their work. Why even offer a warranty? There may be more info forthcoming on this situation.

Rudy's engine is top notch! He educated me too.

what are the CI's on your motor? Are you fuel injected or Carb? How is your Idle? Thanks

I just got off the phone with Bob. WOW what an education and a great guy to talk to. Bob asked questions that no one else had asked. Everything from how I plan on using my boat to what exhaust, Head type- flow and EFI I was using. I underestimated how the cam really works. If I had not already ordered my motors Bob would have receive my purchase order after all that. Building a low maintenance and dependable motor was always my number one goal. I think Bob filled in all the missing pieces. Thanks Bob

598ci N/A with worked 345cc Dart Pro 1's, dry CMI sport tubes, single 1050 Dominator.

I idle at 850rpm out of gear, 500rpm in gear. It doesnt surge, has never stalled, just lopes along. I am running 10:1 compression and pretty conservative timing at 33º total.

Sometimes good things DO come to those that wait. Glad to hear it. Good luck.

You can't go wrong getting the cams Bob recommends. His knowledge is great and he doesn't forget you after you bought the parts. As you know he will talk with anybody to help them out whether he gets a sale or not. I try to talk all my buddies into ordering a cam from him v/s an off the shelf cam out of Summit.

I have one of Bob's cams in my boat... When I was building my engine Bob helped me spec everything! I couldn't be happier with the engine set up... One other suggestion I have is to call Patrick at ProSystems carbs.

What was Bobs opinion on an Aluminum block? My engine builder had a pair of Aluminum blocks in his shop that were toast! I'm assuming they were freshwater but I'm not sure on that. All I know is one of the shop guys said "never use and aluminum block in a boat".

+ 1 :ernaehrung004::ernaehrung004:

Especially if she's 17 :drink:

Me thinks that's a whole new topic!

:ernaehrung004::ernaehrung004::ernaehrung004::erna ehrung004::ernaehrung004:

What did Bob say? Did he like the 332 cc Brodix head for this application? What about cam numbers?

"never use and aluminum block in a boat".

i have seen alum blocks out there in boats and never heard a bad think as of yet ..mmmmmmm do tell why :drink:

Thats alota cubes for those heads, it'll make monster TQ down low but youre leaving alot of HP on the table......

The 332 cc 3xO is not that small. The pour cc might seem small but the 2.300 intake valve and flow numbers suggest otherwise. In this rpm range should work well. I'm interested to hear what RM builder had to say.

I'm interested to hear what RM builder had to say.[/QUOTE]

Must be top secret.

:ernaehrung004:

What intake are you running?

I am using the ACCEL 74202C SuperRam Intake Manifold
oval port.

In matching the heads to scale of the engine it is necessary to evaluate the relevant engine parameters. For this example, looking at displacement, engine speed, and V/E will supply the necessary data.
• 604 CID
• 3000-5500 Power band
• Low compression/low RPM
• Hydraulic roller camshaft with a stated max lift @ valve of .650”, which after deflection may net .620”@ the valve on a good day. As long as the head shows no signs of backing up prior to ~ .750”, any flow values > .625” provide no relevant data to this specific application.
The graph below illustrates the flow values of four different Brodix heads, three of which are oval ports, in the same family as those used on Kens 604 CID.
To keep the comparative head selection valid we will use only Brodix heads, as that is Kens head selection, flowed on the same bench (Brodix), by Brodix. This will mitigate any discrepancies due to operator or equipment. The four heads are:
• BB-3 XTRA 363 cc
• BP BB-3 XTRA O 332 (CNC Ported/50° Valve Job) As used
• BP BB-3 XTRA O 351 (CNC Ported/50° Valve Job)
• BP BB-3 XTRA O 365 (CNC Ported/50° Valve Job)

When viewed graphically it is evident that there is no advantage to utilizing a cylinder head with larger port volume and increased CSA as the flow value increase at our data point is negligible. What the heads pour may not reflect the CSA of the port; however, in a comparison of the same series heads by a common manufacturer, the comparison is relevant.

The downside to increasing the CSA of the port:
• Decrease port velocity
• Fuel falling out of suspension/atomization, wall wetting
• Decrease V/E
• Increased column air speed (of a smaller port) provides increased energy and inertia for cylinder fill, with less reversion potential.
• More energy expended in initiating column motion
The person responsible for cylinder head selection in this application was absolutely correct in their evaluation.
Bob

niiiiice Rob , sounds like Kens well on his way :ernaehrung004::ernaehrung004:

Bob,
Thanks again I could have really screwed this up with out your help.
Ken

any progress updates Ken ???

Brodix 3X Ovals
 

Thanks Bob for the technical analysis of port size. I was hoping you would post some info on what cam specs would also work best in this applicaton. The Brodix 3X Ovals are a good flowing head for the money.

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Sweeeeeeeeeeet .....them Babies look dayum good , may have to leave them on the coffee table right next to the Grey G@@se :drink:

BTW you better save up for some new ROD BOLTS :lolhit:(cause your gettin em ) :drink:

Have new 365 xtra O's and looking to sell or trade for smaller intakes.
 

I have a set of new 365 extra O's professionally ported and looking for smaller/less cc intake runners.
Wanna trade?
They make better cfm,s then the CNC ported heads.
Steve

I`m sure he`d like to trade... 5 years later