Bullet 540
 

Hello evryone . Y bought a boat last summer .
fountain fever 27 1992

engine was supossed to be a bullet 540 650HP

bloc is a merlin III whit Merlin IV cast iron head .

me question is what the rpm range ?

i run a 28p on bravo XR sportmaster 1.50 whit steeling extension box . Run 5000rpm at 70mph … it realy slow …

If it’s making 650hp it’s probably making it at 6k. Just a guess but with that said even if you dropped down a couple of prop sizes I wouldn’t think you’d gain much speed. Maybe a couple mph at best but would likely respond better! Have you cked the transom and stringers for moisture? A good friend and member had a 565 790ish hp that ran just shy of a 100 and around the same year as yours. Details are distant past however Rookie will have the particulars as valako doesn’t frequent here much!

Yes i tried a 26p lab finish , y get about 2-3mph and 5200rpm .

Id be surprised if you are getting the power they sold you on. I have a 29 fever with a 525EFI and an XR drive and can turn a 28p Bravo to 5250.. I would imagine if you were making that sort of power you would be blowing out a 28p. I'm not sure what the extension box will do to my equation here, but feel like you aren't seeing the power you should.

What type of 26 lab did you put on there? Was it a Bravo as well?

Is your sportmaster lower standard length ?

Perf125,

We are running a 28P Bravo prop on a 1.5 Bravo1 drive, and we are running 77-78 at 5000RPM. Check to make sure the prop is stock.

Thanks. Brad.

we run a 25 footer 540 with cast iron ported heads and big valve springs solid roller bullet cam bravo xr stock bravo 26 we can run a bit over 100 and can turn it up to 7000 rpm is your friend...to much torque is not

Sorry im not very good in english . The guy sold me the boat say me it have no information about the engine . But when im look how it’s rigged it’s look similar too the bullet engine . I took out the engine too send it on the dyno .

but a fountain fever whit 540cubic inch engine do 70mph it realy slow …

for the extension box is a Steeling 13inch . The drive shaft between engine and box its on very angle … i think y losse power here …

The drive lower is a standard leght .. im good mechanical but i dont realy good whit the X dimension end the drive height … the boat was hard too place on calm water when y hit full throtel …

And a grin to watch and here it turn those R’s. 😂
I love it but many don’t.

That’s 26 AT right? Bro how drive you grenade? 🧐

Double post

Details... 1992 27' Fountain, 565, twin 1000 cfm, tunnel ram, Haltec EFI, Valako ported heads, RV cam, 10.5:1, Stellings ext box, standard length bravo, labbed 28 bravo, 6400RPM, 98.6 mph. And a handful from 70-80mph.
With 650 you should be at least seeing 80.

Bravo 1.50 ?

did you have picture off the angle off you drive shaft ? Mine is in skeetchy angle …

im questioning about is me engine are not able too rev over 5000rpm or is just y losse power on my box drive shaft … but it sure we have a trouble some where …. The engine go on dyno soon … to see what the best rpm range and what real HP….

What elevation ?
Do you use the trim button ?
Remember to unhook from the trailer ?

Let us know dyno report along with dyno conditions. That will be a good start.

There you go - memory popped back into place a lil bit. 😎

HAHAHA , yes im able too drive a boat . I had about 7 boat before this boat . I drive the 38fever of my brother and it realy easy to drive. But my 27 fever it much hard to drive … 3/4 throtel to go on step … and after it hard to place … drive trim about 4-5 on the indicator …

Yess the first step it to make sure the engine are in great shape and whats is the HP and the rpm .

Yes 1.50.
The drive shaft angle was not bad. He had a short lower on at one time but loss speed. His 27' did not like a high X.

ok thanks ! How high did you trim your drive ?

every boat different but just trim it up until you feel the hull free up and monitor the speed and rpm. Are your indicators working? If not go by feel it’s what I do half the time anyway.

Also where are your Tim tabs at? Send those babies up and down when needed only. They could certainly be scrubbing speed if there downward.

yes me indicator works . Y run at 4-5 and a bit down trim table .. y feel the boat plane good on the water but when y it full throtel y feel the boat run load .

so i drive the boat about 5-6 time this summer …
I make more test in summer 2024…

thanks evryone for the helps i give you some news wen the engine go back from the dyno .

if a 850cfm is too smal for a 540 ? If y buy a 1050dominator can a feel a real difference?

Your engine build/specs will help determine carb size but if it’s a 540 I would think a 2 circuit 1050 would be a better option but in reality you can make almost any carb work with some work. The real kicker is are you certain you have a stroker 540? Any machine or speed shop can determine that for you. I’m not trying to insinuate anything just being honest. You’ll get it worked out as long as you use a reputable shop in your location. Good luck and keep us posted.

the engine block was a Merlin III World and not a GM bloc .. so it realy a 540 ?

in this time the engine is at my engine builder .. y change the valve seal . And y look what cam and spring y have . After this y go to dyno and give you somme news .

I like your style. Concerns about the engine, no problem, lets just pull it and put it on the dyno. If more people took your approach, they would save hours, days, even months of troubleshooting.

I’m assuming it’s a std 9.8” block. Merlin does indicate it’s an aftermarket block. Your bore and crank size will confirm your CI. How long before your engine builder gets it in the dyno? Snap was right - do we dive into all the bs and start investing or strap it on a dyno and see what she’s got!!! Cut to the chase! 😂

im not realy good in english ahaha … my engine builder it a old guys and y work whit y look at all whit them . It winter so i have about 3-4month too check all the engine ahah . But i just look at the spring and cam … after this go on the dyno to see real HP and the rpm range . After this y can have a good start .

this boat was in my area depuis 2006 . A talk to a few guys we have it … one off this say me we turn at 5800rpm whit the same engine .. same blade and it 80mph … the guys we add boat bettewen me and other guys rebuilt the engine …. If it change something in the engine and kill the rpm ..? This is why y go on the dyno

29 Fountain, running 28p B1 at 5K hitting 78 MPH. 5800 RPM with a 28 B1 should be much faster than 80.

https://cimg6.ibsrv.net/gimg/www.off...83410f199.jpeg
https://cimg8.ibsrv.net/gimg/www.off...a9402129d.jpeg

I will go to dyno soon , my engine guys call me and says me my valve spring are bad . Call new one putt on it and go to dyno .

It’s tell me the spec off the cam .
641-667 lift
242-254 @ .050

What are you thinking ?

https://cimg2.ibsrv.net/gimg/www.off...8aa142d33.jpeg
Go on dyno today . For the first pull it’s too lean… asjust the carbs and it 645HP at 5700 rpm’s 😎

Where are you from and who's dyno is it?

looking good, could you post the dyno sheet when its all done?

https://cimg1.ibsrv.net/gimg/www.off...a7b7ab966.jpeg

im from Canada , Quebec .
Dyno is at Compétition Jean Gelinas

In mirabel
we are not too far apart!

Yess , im from Sorel-Tracy