Trojan Boat Forum

Polyester should be fine. Here is a link to G10 They have different types. Wood is also fine.

https://www.mcmaster.com/products/~/mul ... ars/?s=g10

Plywood was used I believe. Todays plywood is not like it used to be I used Oak on mine ( F36). Others have used marine plywood, marine plywood with epoxy, plastic boards and G10 fiberglass I would never use treaded plywood, it has too many voids. If I was to replace my Oak I would go with G10. G10 ...

Check around the battery area too.

The Tri cabin never came with 318s. Assuming you're not talking about a tri-fly. They only came with the 360 (250hp) Chrysler and Mercruiser 255hp(351?) Factory props are 20x17. When picking props I often recommend reducing the pitch from factory specs. As very few are in factory new condition/ If f...

Assuming nothing was changed it sounds like a ground issue. But it is odd it's the upper and lower. If it was only one engine I would think about a sender issue. Still posable, any work done over the winter?

Check your grounds to the panels.
Is this at idle and warm?

Joe, That tach is not original. The hour meter is digital. They did not have digital back then and the OEM tachs were also cable-driven. A new hour meter will be at zero. The OEM would likely say trojan on them. Not sure who made them. Any photos of the other gauges so I can tell you if they are OEM...

It is possible but it is much better and easier done from the top. I had the same issue and rather than cut it open, I used a product called injectadeck. I was happy withe the results. Here is a link to the thread on my repair https://www.trojanboats.net/wforum/viewtopic.php?p=111878&hilit=injec...

Congrats and good luck. Make sure the inspection is really a Survey done by a NAMS or a SAMS-accredited surveyor. At 2 years it is time to paint the bottom again. Hope all goes well.

Any photo of your Alt? Beacon Marine has some

https://www.trojanboats.net/zencart/ind ... th=102_110

Not 100% on what you are looking for. But you can plan on about 1 MPG on plane and maybe 2 MPG below hull speed ( 7 knots or so) While not exact it should be in the ballpark and will vary some on the exact speed, weather conditions, and of course the boat's condition.

You can compare an automotive engine to a marine engine with many differences. Like cams, ignition advance curves to start. starboard engine even turns in the opposite direction than the port.

The 318 is rated at 225hp. Trojan info shows 4000 as top rpm. And it is propped that way. I can try and look up the specs for a new 1971 F31, but it is unlikely an old boat would come close.

Nice work and good info.

I always preferred 3 blades for performance.