Toypirate
Seaman Apprentice
- Joined
- Aug 24, 2011
- Messages
- 31
My neighbor's 33 Larson Cabrio needs new U-joint bellows on both sides as they are cracking from dry rot, I'm gonna replace everything rubber in there as I go since it has been 8 years since they were done last.
Twin 7.4L GI PEFS and they get run fast all the time, He has mentioned some exhaust smell in the cockpit with the full cockpit canvas closed and the detector sounds off sometimes as i am told. So he runs with the front window open which remedies this but is kinda chilly in late october here on the upper mississippi.
I had installed bilge heaters so he can prolong his boating season which has brought up this entire thread. Can you imagine my dispare?
His pivot housings are original and I found the pivot housing Part#s to be the same for both the open and accordian style bellows. The old ones are open and I thought it better to replace them with the accordian style to better divert more exhaust further behind the boat.
My question is which exhaust bellows CAN or SHOULD I use?
I like the Volvo Penta SX-MDC transom shield (accordian) style with the small holes but would there be an exhaust pressure issue, major performance loss, backpressure, overheat, or cavitation?
How about the sierra units? The large slots would relieve some of this but might not reduce the exhaust intrusion into the cockpit by much when on plane.
Or should I keep with the original SX-MHP (open) design and tell him to keep the trims down, bundle up in october and by the way lets have those 16yrs old Co2 detectors checked out? I just don't think open is gonna do though.
There has to be a design flaw here and I'm thinking Larson used the wrong transom model number (off by one part) unless they intended the boat to be run with the canvas down.
Any Input would be appreciated guys and thank you for all.
Twin 7.4L GI PEFS and they get run fast all the time, He has mentioned some exhaust smell in the cockpit with the full cockpit canvas closed and the detector sounds off sometimes as i am told. So he runs with the front window open which remedies this but is kinda chilly in late october here on the upper mississippi.
I had installed bilge heaters so he can prolong his boating season which has brought up this entire thread. Can you imagine my dispare?
His pivot housings are original and I found the pivot housing Part#s to be the same for both the open and accordian style bellows. The old ones are open and I thought it better to replace them with the accordian style to better divert more exhaust further behind the boat.
My question is which exhaust bellows CAN or SHOULD I use?
I like the Volvo Penta SX-MDC transom shield (accordian) style with the small holes but would there be an exhaust pressure issue, major performance loss, backpressure, overheat, or cavitation?
How about the sierra units? The large slots would relieve some of this but might not reduce the exhaust intrusion into the cockpit by much when on plane.
Or should I keep with the original SX-MHP (open) design and tell him to keep the trims down, bundle up in october and by the way lets have those 16yrs old Co2 detectors checked out? I just don't think open is gonna do though.
There has to be a design flaw here and I'm thinking Larson used the wrong transom model number (off by one part) unless they intended the boat to be run with the canvas down.
Any Input would be appreciated guys and thank you for all.