325HP or 340HP?

[rdlangston13]

that's not a bad idea. all that driving in circles has to push all the engine smog into one concentrated area. no wonder that guy that won the daytona couldn't find the winners circle

could you imagine being in the infield of bristol if the cars exhaust exited the left side of the car??

i honestly think that being an outdoor sport the smog dissipates fairly quickly

[sandm]

so wait, they exit to the right? that explains a lot about nascar fans

[rdlangston13]

it does say something about NASCAR fans...that we like the smell of 98 octane race fuel! YUM!

[schuylski]

about the exhaust stream getting warm, i thought i saw that the CAT engines have the separate cooling systems and are not raw water cooled through the engine - they've got different requirements with the cooling.

[cham]

about the exhaust stream getting warm, i thought i saw that the CAT engines have the separate cooling systems and are not raw water cooled through the engine - they've got different requirements with the cooling.

I would think the exhaust would have to be cooled to be in a boat. Exhaust temps are extreme and would quickly start to cause problems in the engine compartment.

[sandm]

I know when I start mine up with the fake lake, water pours out the exhaust just like my buddies boomerang.

[schuylski]

HA! Ok oops not what I meant at all - Don't know if I'm even right, but I meant that I think the cat ext has the closed system for cooling. Water still comes out the exhaust but the raw water doesn't actually go through all the engine channels.

[sandm]

in order for you to have a closed cooling system, you must have a radiator and a heat exchanger. the extcat's are cooled by the lake/river water just like the non-cat motors unless you opt for the closed cooling system or a saltwater package. follow the hoses off your raw water pump and you will see where they dump into.

[moombabound]

Back onto the track...the real benefit of the 340 is the reduction in emissions. The difference vs the 325 is night and day. A 340 would be my recommended #1 mandatory for a Moomba. If you do any surfing, you will eat alot of CO behind a 325. The 325 w/CAT will be along in due time. CAT should be mandatory, not for environmental reasons, for participant safety. A local dealer of a competing brand does not order any Indmar 325s.
As a side benefit, you won't need to dwell on whether to struggle with installing a Fresh Air Exhaust system.

[maxpower220]

Back onto the track...the real benefit of the 340 is the reduction in emissions. The difference vs the 325 is night and day. A 340 would be my recommended #1 mandatory for a Moomba. If you do any surfing, you will eat alot of CO behind a 325. The 325 w/CAT will be along in due time. CAT should be mandatory, not for environmental reasons, for participant safety. A local dealer of a competing brand does not order any Indmar 325s.
As a side benefit, you won't need to dwell on whether to struggle with installing a Fresh Air Exhaust system.

Funny, at 34 mph I don't smell anything and doubt I am getting any CO. The "struggle" of my FAE is that I now don't have to listen to exhaust noise. Also, your dealer has a markup on engines as well.

15 hp in a 3500lb boat isn't much, The 310 hp in my 99 Malibu would walk away from the 325 in my new boat, different hull, running surface, etc.