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jkp1 · 08-23-2005, 11:28 PM

Boy, I have to tell you, at 40,000 lbs loaded, the 42' Post never should have been set up with Gas. I own a 1980 42' Post with Detroit Diesel 6-71ti's pumped to 410 hp and it is just adequate.

Do not underestimate the hassle of converting from gas to diesel. You'll likely have to change out batteries, fuel tanks, lines, mounts, shafts & props in addition to the engines. Oh, don't forget your generator. Can't have diesel engines and a gas genny. You will save yourself alot of headaches by just buying a boat that already has diesels.

For performance with gas, figure 14-15 knots @ 3200 rmp burning about 35 gph. BUT the engines are highly loaded and will wear out every 1000 hours or so. Not sure of range, I hold 508 gallons but your tanks may be less.

By comparison, I cruise at 22 knots with 26 knots at top end. At cruise, I burn about 30 gph. The engines will likely outlive me.

08-23-2005, 11:28 PM	#2
jkp1 Registered User Join Date: Feb 2005 Location: Chester, CT Posts: 7	Eeek! 42' Gasser? Boy, I have to tell you, at 40,000 lbs loaded, the 42' Post never should have been set up with Gas. I own a 1980 42' Post with Detroit Diesel 6-71ti's pumped to 410 hp and it is just adequate. Do not underestimate the hassle of converting from gas to diesel. You'll likely have to change out batteries, fuel tanks, lines, mounts, shafts & props in addition to the engines. Oh, don't forget your generator. Can't have diesel engines and a gas genny. You will save yourself alot of headaches by just buying a boat that already has diesels. For performance with gas, figure 14-15 knots @ 3200 rmp burning about 35 gph. BUT the engines are highly loaded and will wear out every 1000 hours or so. Not sure of range, I hold 508 gallons but your tanks may be less. By comparison, I cruise at 22 knots with 26 knots at top end. At cruise, I burn about 30 gph. The engines will likely outlive me. Last edited by jkp1 : 08-23-2005 at 11:40 PM.