engine wont go past 4000rpm
 

Ok I finally got me 24 outlaw in the water for the first test run. We took it out and everything seemed fine except it would not rev more than 4000rpms. It's smooth fuel pressure is good just hits a wall.

565ci was told 650hp
bravo 1/ 1.5 ratio
28p bravo left hand

Also runs 58mph at 4000
even if I trim will not gain revs.

What is your timing set at and is it advancing properly, should be 32+ degrees total timing depending on motor.

Are the secondaries on the carb opening all the way? Throttle linkage?

Was the motor set up on a dyno?

We do need to time it we only set it at 12 at idle. Didn't want to run it at 3000 on the hose and forgot the light when we went to the lake.

MSD distributor and 6 box.

throttle is set and goes all the way open.
the holley 850 was tuned on the motor before I bought. I bought the engine used.

Verify that the MSD distributor doesn't have the timing advance locked out. If it is you will only see your 12 degrees of timing.

Timing would be your issue.

going to try and put it in the water tonight and set the timing. Kind of sucks on a time crunch going to the shoutout this weekend at the loto. I was also told to unhook the tach and take out the revlimiter. Cant hurt just a quick plug.

http://www.youtube.com/watch?v=n9GKOWOeiAg

http://www.youtube.com/watch?v=KGpJzzG3cjQ

Ok we went out last night. Timing was dead on 34. we unhooked the tach to make sure no interference and that didn't change anything. we took out the rev chip and nothing changed. The secondaries are working. checked with the air cleaner off. fuel pressure is holding at 7psi.
This thing starts nice idles nice. Jumps on plane with no problem in fact all i do is set it at 2200 and then it just planes right out. But when we get to 4000 rpms just runs out no more.
Could it be just bad fuel???

How old is the fuel? It it is bad fuel you are going to have some serious problems at 34 degrees very soon

How is the engine temp?

Did you get a dyno sheet on the engine? Wondering where the peak HP and TQ hit, you might be over propped. I doubt it at 565ci, but maybe

What prop was on the boat before? I would switch to a lower pitch prop first and see if the problem stays.

man, without being there or video it is hard to say... It could be that they have a cam that tops out there, my best guess.. What cam is in it and where did the motor come from? did they give you a build sheet?

What is engine temp? Are you running a thermostat?

Fuel is over a year old. Kind of forgot with everything else we have done.
Innovation marine said made torque somewhere around 4800 cant remember exactly. they said to prop it to 5350. I bought the boat without the engine or a prop.
has a 160 thermostat which is right where it stays.

We are leaning towards bad fuel so we are going to dump it and fill with fresh fuel before the weekend and see what happens. We have done so much to this boat so we have just forgot the simple stuff like how old the fuel was. And I am sure there was never any stable put in it. Because the last owner blew his motor in June last year.

I started here and finished with this.

[IMG]http://i1069.photobucket.com/albums/...w/P1010034.jpg[/IMG]

[IMG]http://i1069.photobucket.com/albums/...w/P1010195.jpg[/IMG]

I still haven't finished everything need to paint over the old exhaust holes.

you did a great job but where are your batteries? you mount them under the rear seat? And don't forget about a blower... uscg won't like that

I has simaler issue when changing motors...fuel lines and antisiphone were too small for new motors..though you should just hook up to gas can to check if its the fuel...

Good call. I had to put bigger fuel lines and pickup in my buddy's boat when he upgraded power.

I just went through this with a 496 I bulit for a 23ft Scarab. Would hit 60 @ 4600 but no more rpm. Swapped out 3 diff props23,24,25. The 25 lost rpm and speed. Turns out had a blow by issue along with head gasket issue. The boat ran FINE! I would not have thought i had the problems i did. I pulled the motor today and going to up grade the cam a bit but putting in new rings and bearings. I would do a static compression test on your cylinders and see where they are. Is the oil clean?? If its getting "dirty" you have have a ring problem. Good luck

Looks REAL nice. Good job!!

Well we are just going to see what happens this weekend with new fuel. I have 1/2 pickup to carb lines so no issue there. Either I will get lucky and it is bad fuel. Or I have way to big of a prop which I don't think so with how it planes and runs.

I would try borrowing a 26" B1 just in case, takes a lot to spin a 28".

My issue was the line (pipe) in the gas tank was too small...

my 2 cents
 

Prop is too big. I have a 24' Python (much lighter boat) with a 625 hp 540 cid motor. After trying many props, my boat likes nothing bigger than a 26 p three blade. I can turn the 26p to 5500 with lots of trim, but with more pitch than 26 the rpms drop dramatically.

And that boat has a really low X I ran a 3 blade 25 labbed on mine with a merc 540 bulldog

I was thinking that but his rpm should increase when he over trims.

you need a 25 mirage + for that boat to even get the nose out of the water..that boat would rock with RT HAND REVOLUTION PROP..http://www.ebay.com/itm/NEW-Mercury-...#ht_2343wt_962

well took it out this weekend and fuel didn't change still 4000 rpms. So this weekend we are going to try some props. A buddy said he has a 25p three blade.
Also I think my oil for the outdrive trim pump needs flushed. the oil foams up when we try it running. I am pretty sure it isn't trimming up while running. When we changed the pump from the old reservoirs they had nasty muddy oil water whatever in them. So we are going to clean it and try some props.

Sounds like the trim rams need to be rebuilt (o rings) or you'll just get more water in them...

Well took it out this weekend. I believe you are right about needing to rebuild pump we tried flushing and it is still air-rating the oil. But a local marina loaned us a 26p 3 blade turbo something prop. Which allowed the motor to turn 5200 with trim all the way down. But this prop didn't look like anything nice which pushed to boat only 57mph . It was horrible on plane and the motor seemed like it wasn't even trying. Thinking maybe 25p rev4.

is the oil foam white/milky?

looks like a lava lamp when it starts then just turns real light color. Lots of little tiny air bubbles. after a few minutes let it settle, looks perfect again.

plastiv bottle? or old stlye..upper o ring sounds like. milky color would suggest rams got in some water which isnt the case...ya, play with some rev 4's from bblades and get it over with...

Just an update took the boat boat out last weekend for the last run of the year. We put a new trim pump on and it actually worked. Engine went up around 4600 rpms and went 65mph on gps. Still have to much prop but was glad to see improvement. We are planning to pull the motor this winter and go through it. It burned 1 quart of oil an hour. We did run 120 miles that day down at the loto an that was running 53mph at 3700 rpms pretty much the whole time.