65Shepherd
New member
Hoping this community can help me out.
I have twin Crusader 220's on my 1965 Shepherd Cruiser. We bought her last Fall. Port engine runs fine and uses 60% of the fuel that the starboard engine burns. At WOT I'm supposed to get 4000 RPM. Port seems like it could get there no problem (had it at 3600 with room to go on throttle) but starboard starts getting bogged down around 2500 and will only get to 3000. Once there it swings between 2600 and 3000.
A few things I'vr checked so far:
- swapped carbs made no difference to bad engine.
- set timing and confirmed mechanical advance works properly
- pulled #1 plug and it was quite black.
- new fuel lines, water separating filters and carb filters
- vacuum is lower on bad engine, 15 at idle 10 under load (2000 rpm). Good engine is 18/15.
- checked intake manifold and carb for leaks with ignition spray and brake cleaner. No revving occurred.
- cleaned contacts in distributor. Both distributors had some build up. Also put new mechanial advance springs in.
- compression test done in Oct, all cylinders looked good.
I don't think it's fuel supply related as the bad engine is burning so much more fiel and swapping carbs made no difference. It could be a prop issue but both are marked 16x14. I have a spare set of 16x14 that had balanced and checked that I would like to get on to be sure but I think the props are ok.
I should add in Mar I ran both engines at around 3600 rpm no problem. Just one time though. We have since made some friends in the wooden boat community and were surprised to hear they were all cruising at 18-22 knots and burning 2 Liters per nautical mile to our 4.5 at 8.5 knots. I wanted to see what our fuel burn was like up on plane.
My next steps were going to be new plugs, cables and swapping coils. Any help is appreciated, this i all new to me.
I
I have twin Crusader 220's on my 1965 Shepherd Cruiser. We bought her last Fall. Port engine runs fine and uses 60% of the fuel that the starboard engine burns. At WOT I'm supposed to get 4000 RPM. Port seems like it could get there no problem (had it at 3600 with room to go on throttle) but starboard starts getting bogged down around 2500 and will only get to 3000. Once there it swings between 2600 and 3000.
A few things I'vr checked so far:
- swapped carbs made no difference to bad engine.
- set timing and confirmed mechanical advance works properly
- pulled #1 plug and it was quite black.
- new fuel lines, water separating filters and carb filters
- vacuum is lower on bad engine, 15 at idle 10 under load (2000 rpm). Good engine is 18/15.
- checked intake manifold and carb for leaks with ignition spray and brake cleaner. No revving occurred.
- cleaned contacts in distributor. Both distributors had some build up. Also put new mechanial advance springs in.
- compression test done in Oct, all cylinders looked good.
I don't think it's fuel supply related as the bad engine is burning so much more fiel and swapping carbs made no difference. It could be a prop issue but both are marked 16x14. I have a spare set of 16x14 that had balanced and checked that I would like to get on to be sure but I think the props are ok.
I should add in Mar I ran both engines at around 3600 rpm no problem. Just one time though. We have since made some friends in the wooden boat community and were surprised to hear they were all cruising at 18-22 knots and burning 2 Liters per nautical mile to our 4.5 at 8.5 knots. I wanted to see what our fuel burn was like up on plane.
My next steps were going to be new plugs, cables and swapping coils. Any help is appreciated, this i all new to me.
I