Hey Andy how are things going!!! I am running 77's front 90's rear with no PV in the secondarys. I am going to run them the way they are for right now to get a base line over last year. And adjust from there.

WAY TOOOO BIG 74 and 84's also too much air flow 850cfm. I will see if I can find a set of 780's with vaccum secondaries for you to try/borrow

That's a pretty mild cam, but it appears to be ground with the correct marine advance (+4 to +6). A Merc 420 specs a little hotter, but your custom lobes may be more aggressive. I'm guessing not.

That IS a lot of fuel (jetting), but depending on your setup it may actually be correct. My guess is that it is fat. When you do your plug chops, make sure you use fuel with no alcohol in it since you get weird plug readings with the crap that comes out of the pumps these days. 71/84 is closer to what I would expect with Merc exhaust manifolds. Headers will require you to fatten up a touch.

Andy they are accually 800's and if you check out the dyno sheet (don't forgrt to click on it it will get bigger easier to read) the A/F seems to be spot on:confused:

Peak HP is at 4800, with those heads,carbs and intake it should be closer to 5000-5100. Tomorrow I will check your cam specs with comp cam's tech's.

**** UPDATE***

i finally got her in the water on sunday! The motors ran flawless for the hour and half we were out. no leaks or drips just no speed again. After racking my brain all the way back to the ramp and then again back at the building i was looking at the drives and it looks to be they are set wrong. Thanks to BOATMAN302 and also talking to Archer marine the trim guages are all wrong and it looks as if i was not trimming where it needs to be. Going to reset it tomorrrow and try a set of bigger props to see what happens. Here is a pic of the drives at MAX trim. As i understand it the drives need to be parallel to the bottom of the boat at CRUISE setting. it seems to me to be to low.

before you look into new props, consider revising the gear set ( inexpensive strait cut gears?) to change your ratio +/- 20%

what rpm were you at
where do you want to be (5000?)
i test drove a 311 kamma adn the boat rally lightenes up when you trim it to throw the roost.
also did you notice how long it takes to coast down when you cut the throttles :). shows how efficient (low drag) a surface drive is

great news !!

Ramb

RAMB i was turning the these motors 5000 as well i want to stay there maybe 1 or 200 below since my motors make the most hp there. The is a gent in Nunica that was very gracious to let me borrow a pair of 17x27 three blades and a pair of 17x25 4 blades this weekend. i have 161/2 x 24s now so i am going to see what these do

makes sence
if you find there is more speed, you might still be able to keep your props and regear, unless he wants to sell at a great price.

the boat i tested had rebuilt mags ( ~420hp ?), and ran approx 70-72mph for a reference
not sure on prop pitch
Ramb

Glad the engine dramas appear to be done. Good luck with the setup work!

Did you ever talk to Cuda since he used to own a Kaama??

i did when i first bought the boat. i haven't since then. I did do ALOT of searching the past couple days on here to find out mor info and read most of his posts on the subject though:D

Gotcha,

Good luck with her!!

had a nice run satuday and sunday. Did some testing sat. whith the trim running where it is suppose to be. I still have a problem where the trim pumps on the port side work when they want to:rolleyes: anyway it ran 62.8 @5600 almost 5800 in the CRUISE mode. It looks like i need some BIG wheels to get the rpm back down to around 5000. The worst part is i cannot get the dayum things to heat up. Check the oil sat after the run and the oil is milky. Temps never got over 100 degrees changed it for sunday and have not checked it yet. i am going to put thermostats in as how i have not been running any and i have crossovers.

BTW nice to see RAMBUNCTIOUS came up from Holland just to see me:p:D

Great to finally meet you and your family CarBiz.

would have been nice to see those roosts on Sunday but with 5' swells about 10' apart it was pretty rough. I know we had some high launches a few times

Maybe Josh has some props left over to try

Ramb

Hey CarBiz,
How did things turn out at the end of the season? I bought my 311 with Kaamas 3 seasons ago expecting the worst with the replaced engines but I'm pleasantly satisfied. Some exhaust issues which still remain and, as always, someone dicked up the rigging and upholstery along the way. Otherwise, it runs very strong. I'm curious as to what you found with gear ratio and prop setup. I had spoken with Brian Goetchius before he put the boat up for sale. I wasn't aware he had replaced the original motors. Same problem with mine. Engine builder told my original owner that BOTH engines were shot and he needed new ones. (Engine builder saw the bowtie on the side of the block) Now engine builder has two bowtie engines from Innovation Marine. He did put a very nice pair of Gen 5 engines in though. I kept the Gen iv motors from my F402 just in case. As Ramb commented above, you can change the effective prop pitch with a drive gear change. The gears are standard V-drive parts from Casale.

ALJ - Well the engine drama is still haunting me a little. The port motor has always had a water issue in the oil since it was put in. I had the intake gasket changed the first weekend in Oct and ran it one time and the water is still there....... Both motors run flawless and i can spin them 5000. With the 24's they will spin 5600:eek:............ I am in the process of pulling them both back out and i am going to take them back to Felice to see what is wrong. The best i have seen out of it is 67.9 @ 4800 still not trimmed all the way. The props are 17x 29 4 blades I borrowed from BOATMAN302. All in all it has been both frustrating and exciting:cool:

*** UPDATE***

ok............what frustration this thing has been from day one...........The port motor is pumping water out number 6 right out the exhaust port. the head gasket was not blown it seems the valve guide is leaking.

The starboard motor has a blown head gasket and one pison that is toast. the block is going to have to rehoned and a new piston.


The motors show alot of detonation it seems too much compression for 89 octane. I am going to have them completely redone AGAIN and hopefully..........hopefully have a good boating seaon for my family and my sake. i will report when i get more information!!!

CB

Just go over them completely, I had issues last season trying to cut stuff that should not have been an issue, I did everything the last time and have had no issues.... hope all goes well, I spen last summer pulling engines 3 times, I know how this feels...

i feel your pain . My first weekend out in my 242ls I managed to hurt the engine . was running strong untill it destroyed an exhaust valve in number 6 , number three was right behind it , it was tuliped pretty bad .I had just baught the boat and only really ran it on the trailer since there was still snow on the ground . building her up with a small nitrous/blower cam , inconel valves and new je pistons to hopefully work better with the procharger the boats had on it since 1998 . Im not sure what Id do if i hurt it first time out . probably pull a Lutenate Dan and jump over board and start doing the back stroke !!

I haven't read your whole thread but just curious if the person doing your engine work is a marine engine guy? There are more differences between marine and automotive engines than a lot of people know. Lots of variables, gaskets, valves, cam, bearing clearances, piston to wall clearances, cam choices, how much timing. All these things add up to making marine power much differently than strip power. An engine that works well on the strip might not last too long in a boat.

**UPDATE**

Well after some debating I went ahead and bought new heads. Went with 308cc Darts. The block is done and bought one new piston. I talked to Precision Power today and he going to get on them right away. We are also going to do a cam change as well. I hope to gain some power and have a turn key boat!!! i will post results after the build!

Good luck CB you could use a trouble free summer:drink:

Thanks Bro!!! Considering i have had it for almost 2 yrs and only put 25 hrs on it i need to have some fun:drink:

Damn boats!!! Hope your luck turn around w/ it. :drink:

***UPDATE***

Dynoed one yesterday all in all good. 454 HP and 514 TQ this was with manifolds @34 degrees. At full throttle the motor was plently fat BUT Ben found that at part throttle it would go into 14.8-15.0 AF. Prolly why the motor came apart last time. he called me and said he ended up with 84 squared on the jets. i hope to be testing on fri night. I will post the dyno sheet when i get it :drink:

Well i think the drama is FINALLY over. Test run last night other than fine tuning the idle the boat ran good. ALOT of little things had to be done but i think she should be trouble free!!!:drink:

HERE IS THE "NEW' DYNO NUMBERS.

Only change was the cam and heads dynoed with manifolds not headers.

Cam is a Comp Cam # CB XM 270H-12

Heads are the Summit BBC 308CC

Click the pic it will get bigger to read!

congrats biz

awesome Jeremy
get some hours on that puppy
buddies are wanting a "guys boat day" soon
so maybe we can hook up in Grand Haven

Ramb