LuckyDog33
New member
New to the forum. Looking for some advice on my new to me boat ‘89 Tiara 3300 with twin Crusader fwc 454s. I apologize in advance for the long post.
1. I have no clue what year or manual needed. The serial numbers are 80292 RH port and 80377 LH starboard. I’m told these are 350hp but cannot find any indication of such and assume these are original motors with 2,000hrs +/-.
2. The motors sound really good, but lack power. I’ve been on same boat at 3000rpm she moves 21-22kts. At 3000rpm I’m barely getting 15-16kts and barely on plane. WOT should be 4200-4400, but I’m only getting 3600-3700. Props are original 18x21 3blades. Running gear is clean as the boat was pulled, power washed and I cleaned all the running gear. No change.
——I've done the following to both motors: racor filters, in-line filter to Q-Jets, new plugs wires cap rotor, and Seafoam spray into carbs to clean top half. Motors fire up much quicker and better throttle response but no change to power.
I have to still check timing, advance and total. Port motor is nearly impossible to see the timing marks. I’ve read these distributors do go bad and the springs corrode. Would it be worth it to just replace with Delco Voyager EST? Looks like I have the conversion kit to electronic but did look a bit corroded when I pulled the cap.
—-Compression was 122-134 across all cylinders with the exception of #5 on starboard was 101. Leak down proved to be a stuck intake valve. Is my compression too low? I’ve found conflicting info 120-140 is spec, but also saw 130-170, uniformity being most important.
im trying to figure out if during winter layup should I pull motors and do a complete rebuild or just a valve job on starboard that has a bad valve.
if not rebuilding completely, I’d plan to replace both intake manifolds with edlebrock performers, exhaust manifolds, rebuild carbs (I still need to verify secondaries are fully opening), both Carter diaphragm fuel pumps, and all new fuel lines.
Im just not sure if I’m on the right track. I do not want to have to pull the motors if not needed, but do need to get the proper power from these motors for the boat to perform the way it should.
thank you all in advance
1. I have no clue what year or manual needed. The serial numbers are 80292 RH port and 80377 LH starboard. I’m told these are 350hp but cannot find any indication of such and assume these are original motors with 2,000hrs +/-.
2. The motors sound really good, but lack power. I’ve been on same boat at 3000rpm she moves 21-22kts. At 3000rpm I’m barely getting 15-16kts and barely on plane. WOT should be 4200-4400, but I’m only getting 3600-3700. Props are original 18x21 3blades. Running gear is clean as the boat was pulled, power washed and I cleaned all the running gear. No change.
——I've done the following to both motors: racor filters, in-line filter to Q-Jets, new plugs wires cap rotor, and Seafoam spray into carbs to clean top half. Motors fire up much quicker and better throttle response but no change to power.
I have to still check timing, advance and total. Port motor is nearly impossible to see the timing marks. I’ve read these distributors do go bad and the springs corrode. Would it be worth it to just replace with Delco Voyager EST? Looks like I have the conversion kit to electronic but did look a bit corroded when I pulled the cap.
—-Compression was 122-134 across all cylinders with the exception of #5 on starboard was 101. Leak down proved to be a stuck intake valve. Is my compression too low? I’ve found conflicting info 120-140 is spec, but also saw 130-170, uniformity being most important.
im trying to figure out if during winter layup should I pull motors and do a complete rebuild or just a valve job on starboard that has a bad valve.
if not rebuilding completely, I’d plan to replace both intake manifolds with edlebrock performers, exhaust manifolds, rebuild carbs (I still need to verify secondaries are fully opening), both Carter diaphragm fuel pumps, and all new fuel lines.
Im just not sure if I’m on the right track. I do not want to have to pull the motors if not needed, but do need to get the proper power from these motors for the boat to perform the way it should.
thank you all in advance