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- Scurvy Dog
- Posts: 1
- Joined: June 21st, 2022, 6:53 pm
- Vessel Info: 1996 Carver 320 Voyager - gas engines 350 Cruisader XL
- Location: Ladner, BC
New to the forum and will appreciate any help.
Purchased our Voyager several years ago and have always had issues with it getting up on plane.
Believe the engines are Cruisader 350 XL, 260 hp.
In 2020 blew the Starboard engine, reason was never determined (except it happened right after the carburator and timing was tuned by mechanic).
Decided to rebuild both engines because I didn't want an offset in the throttle. All went reasonably well, got up on plane for the 1st time ever - mechanic put in 750 double pumper Brawlers (vehicle carburetor). The issue became oil pouring out everywhere, rocker arms burning up and found out the wrong size rods had been used with small pieces of washers found under valve covers.
Found a new mechanic and rebuilt for the 2nd time. Engines run great but max RPM is 2900, should 4000 - 4400, as a result can't get up on plane.
Have tested all possible mechanical issues. Have pulled it out and bottom painted, put in rebuilt carburetors (Rochesters). Have spent more money than anyone even imagine.
Really love the boat but need to get to the bottom of the issue.
Props are 18 × 18, have been told by the prop guy to try 14 x 12, again more money spent without knowing if it will work.
Loaded boat weight is 18,000 lbs. Gear ratio is 1:1. WOT is 10 knots at 2900 rpm
Anyone have any other ideas, I'm at my witts end!
- Posts: 2456
- Joined: February 28th, 2017, 6:04 pm
- Has thanked: 13 times
- Been thanked: 656 times
Knowing just what you wrote, you need to find out why the engines are not developing the power they should be.
Were the second engines built to the Crusader specs? Same type cam, rockers, etc? Same distributors? Same timing curves?
That does appear to be a pretty heavy boat for only 260HP engines, so if the second engine rebuild resulted less HP, that could be an issue.
- Posts: 1273
- Joined: May 22nd, 2018, 12:09 pm
- Vessel Info: 1995 Carver 330 Mariner
Twin 350XL Crusaders
Home port: Menominee, MI
- Location: Green Bay, WI
- Has thanked: 62 times
- Been thanked: 289 times
( All weather people have to say this on air, near lakes )
- Posts: 3903
- Joined: April 23rd, 2015, 10:22 pm
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Quite the history there, this could simply be a tuning issue now......a couple ideas......if the distributors were never right as far as having the proper marine advance curves then the engines will not have ever made power at the right rpm and could have been the reason the other engine failed, also the carbs need to have the secondaries opening for the engines to make power.
What tells me this is your rpm vs speed, that speed is just pushing water and very close to getting over that wave. I would not run the boat like that until I got the tuning verified and corrected if the distributors turn out to be bad. Actually even one engine bad can hold them both back.
Honestly, IMO the props may not be the issue here unless they are damaged somehow, also do not run automotive carbs in marine engine compartments, they are not vented properly and can cause an explosion hazard. If you have the rochesters have your mechanic make sure the power circuit is working , secondaries opening......good luck man.
“Long may your big jib draw.”
- CYO Supporter
- Posts: 5094
- Joined: July 10th, 2015, 9:58 pm
- Vessel Info: 1989 Carver 3807 Aft Cabin
- Location: Ontario, Canada
- Has thanked: 331 times
- Been thanked: 1300 times
I'd go back to basics, do some simple tests like leak-downs, check vaccum, etc. and inspect the hardware; carbs, distributors, plugs, etc. A vacuum test can tell you a lot about how the engine is operating and whether some things are set properly or not. Then if everything checks out on the engines, the fault must be the boat side.
BTW, disconnect your tachs and sync gauge if applicable and see if you still have the same issue. It's easy to do and may eliminate one possibility.
- Posts: 800
- Joined: May 12th, 2017, 10:41 am
- Vessel Info: 2001, Carver 356
- Location: Lower Potomac, VA
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