Looking for cam and intake suggestions
 

My engine is finally comming together! I'm looking for suggestions for a camshaft and intake.
Here is what I have so far.

1993 Checkmate 230 Enforcer
Gen VI block 4.5" bore 509 cu. in.
JE pistons 8.8:1 compression ratio
Stock rods with ARP bolts
Stock crank turned .10 .10
Balanced rotating assembly

088 Iron heads ported
2.25 intake and 1.90 inconnel exhaust valves
Crane Gold roller rocker arms
Morel lifters

Keith Eickert exhaust manifolds.

The advertised weight of the boat is 3200 pounds

Here are the head flow numbers

BRZEZINSKI RACING PRODUCTS FLOW REPORT
CASTING NUMBER 14097088 CHEVROLET HEAD
2.25 INTAKE 121G FLOW GIUDE 4.500 BORE
1.90 EXHAUST NO HEADER

ACFM
LIFT #6 exhaust #8 exhaust #6 intake #8 intake

0.05 30.5 30.3 38.9 35.1
0.10 61.0 60.6 77.7 70.1
0.15 90.6 90.6 112.1 109.7
0.20 120.2 120.6 146.4 149.3
0.25 134.5 134.2 181.2 183.7
0.30 148.8 147.9 216.0 218.0
0.35 164.5 160.5 238.6 239.5
0.40 180.2 173.2 261.2 261.1
0.45 197.1 183.2 277.0 279.2
0.50 214.1 193.2 292.8 297.3
0.55 221.9 203.8 302.7 313.6
0.60 229.7 214.4 312.5 329.9
0.65 232.9 222.0 319.3 334.7
0.70 236.1 229.6 326.0 339.4
0.75 236.9 231.4 328.3 342.1
0.80 237.7 233.3 330.7 344.8

AVERAGE: 171.0 164.3 235.1 240.5

Did my machine shop do a decent job on the heads????

Thanks,

Doug

Re: Looking for cam and intake suggestions
 

Here are the head flow number again as a picture. Sorry, I couldn't get the columns to line up in the last post.

Re: Looking for cam and intake suggestions
 

Please :)

Re: Looking for cam and intake suggestions
 

so how can you expect a cam recommendation if you don't tell us anything about what it is going in, how you plan to use it, what your expectations are, where you wish to focus trade-offs, and what maintenance schedule you are comfortable with?

you want a cam suggestion on nothing more than a flow sheet?
Okay, how about this one?

Re: Looking for cam and intake suggestions
 

Looks good to me. All the lumpy bits are in about the right place. :D

Re: Looking for cam and intake suggestions
 

:D

Re: Looking for cam and intake suggestions
 

I thought I posted more than just a flow sheet :confused:
The Boat is a 1993 Checkmate 230 Enforcer
Gen VI block 4.5" bore 509 cu. in.
JE pistons 8.8:1 compression ratio
Stock rods with ARP bolts
Stock crank turned .10 .10
Balanced rotating assembly

088 Iron heads ported
2.25 intake and 1.90 inconnel exhaust valves
Crane Gold roller rocker arms
Morel lifters

Keith Eickert exhaust manifolds.
The advertised weight of the boat is 3200 pounds
My expectations are to make over 500hp reliably.
I could probably give up a little bottom end as this is a relatively light boat. I'm comfortable with any maintenance schedule necessary

Re: Looking for cam and intake suggestions
 

What the heck happened to the free exchange of information that used to be so representative of OSO. This guy, on a limited budget, in the true spirit of the hobby comes seeking the help of the members of the board. He even goes as far as to SCAN the flow sheet on his heads and list in detail 90% of the pertinent information required for an evaluation. For his efforts he gets ridiculed into submission by a member I used to respect highly, 3 newbies who think their being cool to grovel for acceptance, and one that knows a sum total of 2 alphanumeric combinations (731/741).

Re: Looking for cam and intake suggestions
 

RLW,
Well said, I couldn’t agree more. The information provided was accurate and certainly enough to begin to respond to the question originally posted by Boatally Insane. The few details that were omitted could have been addressed with far less effort than it took to embarrass him in a public forum. It’s not about big cams/small cams; it’s about getting the most from what HE has to meet HIS needs and goals. Those goals might include meeting his performance requirements with the correct “lumpy bits”. Boatally came here respectfully requesting information, assistance and direction of the members of the board more experienced than him in these areas. If the question is too trivial to warrant expert advice, why respond at all?
Bob

Re: Looking for cam and intake suggestions
 

as a novice myself....i was hesitant to even post anything!!! glad to hear some people are willing to REALLY help out!!
RLW and RM thanks!! do you have any cam or intake suggestions? :D

Re: Looking for cam and intake suggestions
 

I always rec. this one but it works well in the 454 with smaller Vortec heads and 9.1/1 compression. The ZZ502 cam from GM.Forget the exacts but about 224/234 dur and 527/544 lift. Plenty of cam for up to 5500 rpm and very strong torque down low. You could prob go bigger with a good non reversion exhaust but it will put you around 500HP tons of torque and it's cheap from GM $160 or so.
I'm also in love with the Dart intake I'm using although it's a little big it does plenty from the get-go without bogging,,would be even better on your. Mine is for big oval ports but rec is the most common,,Ebay $250,,,looks like an HP500 to ;) I have used Edelbrck torquer II's on other boats and they did well but because of flat tappet cam and sim spec it was weak on the low end compared to the roller set up.
Don't mind Mcollinstn,he can't help himself but after he vents he usually has some very technical and helpful info,,usually.
I am no expert but have built about 6 boat motors over the years and am learning here.

Re: Looking for cam and intake suggestions
 

doug, ive got that zz502 cam for you....!!!!.......also know that guy still has his hp500 intakes!!

just a reminder!

anyone looking for gen 6, zz502 cam, gm lifters, dog bones, spider, timing chain and cover.....ive got all new take offs i want to get rid of reasonable!!!

sorry to use your thread for my ad doug!!! ill be quiet now :drink:

Re: Looking for cam and intake suggestions
 

I would have thought the Crane 731 or 741 would have been great suggestions. Is that wrong?

Re: Looking for cam and intake suggestions
 

Might as well use it for something good Kevin....

RLW thanks again..

Rmbuilder Rest up and call me when you're feeling better.

No, there's no wrong answer, I'm just looking for people's suggestions on what to run from their own experiences, as I don't have a lot of experience with marine engines. All the engines I work on have about 16:1 compression and run 25-30 psi turbo boost!!!


Later,

Doug

Re: Looking for cam and intake suggestions
 

:D :D all very good i would try to boost compression to about 9.5 but no moor than 10.2 the hyd. roller cam 830 to 850 4150 hollie, dart typ intake.. i have a ,, iam told a crain cam from hp. 500 and 32 value springs to to mach. springs have about 15mins time. 2 110 mech fuel pumps..913 9477222.. ps dicth the water surculationg pump, for 15 moor hp eeeeees

Re: Looking for cam and intake suggestions
 

50boat, I doubt that you'll find 15 HP by removing the "surculationg pump" and think in our colder water temperatures it should be left on. Doug, it looks like you're dropping the EFI route in favor of a carb. I think it'll make life much easier in the search for more horsepower! Maybe you should start another thread under a different screen name. It seems alot of people want to rag on you instead of helping! :rolleyes: :rolleyes: Steve

Re: Looking for cam and intake suggestions
 

With the E/I ratio you will be looking at something in the high 220 range on the intake and around 12 degrees more on the exhaust. Lift, will be around 630ish on intake an high 500's on the exhaust. Max rpm will play a factor and without it these are just speculative. The 500HP reliable will be no problem.

Chris

Re: Looking for cam and intake suggestions
 

Hey Cooltoys,
You are describing an engine that I had planned to build this winter but I got a great deal on a 502MPI instead.
I do still plan to build up my 1999 7.4MPI at some point too...
My plan is for 454 with flat tops, vortec heads, dart intake, 750cfm carb, ZZ502 cam. Hoping for 420HP+ at 5200rpm...

Re: Looking for cam and intake suggestions
 

After several phone conversations with RMBUILDER(MarineKinetics)
, I ended up having Bob spec my camshaft.

When I asked about intakes we ended up having an hour long discussion and when I hung up the phone I realized he had never given me a "brand name" of what to buy, but instead educated me more on how to decide for myself :D

and as you can see by the results a well engineered combination pays off :D




Here are the rest of the specs

Engine build and dyno results


Doug