FF
Guru
- Joined
- Oct 12, 2007
- Messages
- 22,552
"In the past when I entered into the US I never had the EPA show up and question my engine. Nowadays with the SVRS it is even more unlikely.
So from a practical point of view, who's gunna enforce the Tier requirement for a single boat, several years old, sailing back to port in America?"
Folks who have visited overseas with a bunch of burorats know the value of a wax seal on most any piece of paper.
I would have made some metal decals or plates and simply glue or rivet them on the engine.
TIER III, or 33 , its still boob bait for lazy B-rats , so should work if ever questioned.
"So that raises the next question... what would be better - a Jimmy 6-71 or a Cumming 6BT? "
At just over 20 hp a cylinder a 6-71 should be able to operate at 1500 or perhaps less , be properly loaded and be quiet . 30HP per is about max for efficiency as is 1800RPM
I would not go below 1200 RPM but might try to prop for LRC at 1200 .
The 6-71 has reams of HP/RPM/ Injectors info .
A 1200 or 1500 cruise may require a deep reduction gear and large (expensive ) prop.
But the efficiency and silence are forever!
So from a practical point of view, who's gunna enforce the Tier requirement for a single boat, several years old, sailing back to port in America?"
Folks who have visited overseas with a bunch of burorats know the value of a wax seal on most any piece of paper.
I would have made some metal decals or plates and simply glue or rivet them on the engine.
TIER III, or 33 , its still boob bait for lazy B-rats , so should work if ever questioned.
"So that raises the next question... what would be better - a Jimmy 6-71 or a Cumming 6BT? "
At just over 20 hp a cylinder a 6-71 should be able to operate at 1500 or perhaps less , be properly loaded and be quiet . 30HP per is about max for efficiency as is 1800RPM
I would not go below 1200 RPM but might try to prop for LRC at 1200 .
The 6-71 has reams of HP/RPM/ Injectors info .
A 1200 or 1500 cruise may require a deep reduction gear and large (expensive ) prop.
But the efficiency and silence are forever!