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Phoenix 29- gas repower options 5.7s

Old 12-24-2019, 11:12 AM
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Originally Posted by LI32 View Post
The Crusader 5.7 & 6.0 are both GM small blocks, so either will fit in any boat that previously had a 5.0, 5.7, 6.0 or 6.2 (obviously, they would also fit any boat that had a 7.4, 8.1 or 8.2).
I think that boat would perform really well with a Crusader 6.0 EFI @ 375 hp.
Whatever you do, if replacing 30 year old motors, you want a full repower - the old accessories are just as likely to leave you stranded as an engine failure. I would probably also rebuild or replace the gears.
I agree, brand new 375hp engines would be sweet, hoping she is a candidate for that upon inspection. Unless a great pair of running takeouts come along with EFI & FWC with low hours (like a post above might have), I would want to go all newest tech thats proven, even if it means doing EVERYTHING. I had been left stranded by cooling accessories on my Tiara, never the motor itself. So if (more like when) I repower, it would be everything, nothing like not taking it across the goal line to save a few $ and use old parts.

Old 12-24-2019, 12:50 PM
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Originally Posted by billinstuart View Post
The problem with digital motors is adapting fuel systems, gauges, controls and exhausts. The digital stuff often makes hp at higher rpms, so props still have to be repitched. I'm not sure if the bell housings are interchangable, and a digital motor cannot be counter-rotated. Physically, I agree there should be no serious issue in upgrading, and the accessories should be fresh.
Does anyone not use ZF down angle gears (which are bi-directional) when they repower? That avoids the need for counter-rotation (diesels have literally been doing it this way for decades).
The higher rpm is also usually not an issue when you go from 270 hp to 375 hp, the old props will be close, but give about 15% more speed). If you go the repower route for an older boat, you don't need to buy the catalyst exhaust, so they old ones (if they are 4") will bolt right up. You might need larger fuel lines and a return, but that is pretty simple.
Old 12-24-2019, 01:37 PM
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Originally Posted by LI32 View Post
Does anyone not use ZF down angle gears (which are bi-directional) when they repower? That avoids the need for counter-rotation (diesels have literally been doing it this way for decades).
The higher rpm is also usually not an issue when you go from 270 hp to 375 hp, the old props will be close, but give about 15% more speed). If you go the repower route for an older boat, you don't need to buy the catalyst exhaust, so they old ones (if they are 4") will bolt right up. You might need larger fuel lines and a return, but that is pretty simple.
Marine transmissions have been using down angle for years. Volvo had em in the mid to late 80's in the MS3/4/5 and then HS1 transmissions. ZF has been making them for years. Having a down angle will allow you to have a steeper shaft angle (if needed) while the engine will be fairly level. Zf gears are high quality. Be aware that if you change from a volvo gear to a ZF, you will need to change either the placement of the engine, the height and other things. The ZF gear is shorter than the Volvo gears.
Old 12-24-2019, 01:38 PM
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Originally Posted by LI32 View Post
Does anyone not use ZF down angle gears (which are bi-directional) when they repower? That avoids the need for counter-rotation (diesels have literally been doing it this way for decades).
The higher rpm is also usually not an issue when you go from 270 hp to 375 hp, the old props will be close, but give about 15% more speed). If you go the repower route for an older boat, you don't need to buy the catalyst exhaust, so they old ones (if they are 4") will bolt right up. You might need larger fuel lines and a return, but that is pretty simple.
The old velvet drives are hard to kill.The ZF's are a great unit, but not real common. I'm not sure if modern Gen4 stuff works without a O2 sensor/catalyst. I've seen them at boat shows, and they are scary packed tightly with exhaust, electronics, water lines, etc.
Old 12-24-2019, 01:47 PM
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Originally Posted by LI32 View Post
Does anyone not use ZF down angle gears (which are bi-directional) when they repower? That avoids the need for counter-rotation (diesels have literally been doing it this way for decades).
The higher rpm is also usually not an issue when you go from 270 hp to 375 hp, the old props will be close, but give about 15% more speed). If you go the repower route for an older boat, you don't need to buy the catalyst exhaust, so they old ones (if they are 4") will bolt right up. You might need larger fuel lines and a return, but that is pretty simple.
The old velvet drives are hard to kill.The ZF's are a great unit, but not real common. I'm not sure if modern Gen4 stuff works without a O2 sensor/catalyst. I've seen them at boat shows, and they are scary packed tightly with exhaust, electronics, water lines, etc.

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