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Carb tuning question?

2K views 8 replies 3 participants last post by  steves86ta 
#1 ·
Posted this in the V-drive forum as well, lots of jet boats with wet stacks, so hopefully my issue has already been resolved by someone:

Has anybody successfully done a temporary installation of a wide band O2 sensor and AFR gauge to dial in a carb? I'm able to set up the sensors no sweat, my concern is how to keep it dry since I have wet stacks. My thought is to setup a temporary inline tube where the rubber hose interconnects the riser outlet to the transom trumpet. I can redirect the water overboard briefly, I'm just not sure how fast the heat will get out of hand and melt the rubber tubing (real quick I presume).

Any thoughts or first hand experience with this would be great, I'm installing a new carb on my old DiMarco 21 this week to free up the second carb for my other motor. Planning to tune it this weekend an would refer to be able to dial it in using the AFR.

Thanks

Mike
 
#2 · (Edited)
I dont know if this helps you or not. But i have a friend that had forgot to turn his water on (idiot i know) He melted his exhaust tubing very quickly...

I have a wideband on my boat, If/When i inject the water the readings get very screwy.

I know that Mercruiser has o2 adapter plates that go between the logs and the riser. I dont know if something like that is an option for you?

Oxygen Sensor Spacer | Wags Engineering

theres also this one
Oxygen Sensor Plate Fuel Injection Mercruiser O2 EFI | eBay
 
#3 ·
I know that Mercruiser has o2 adapter plates that go between the logs and the riser. I dont know if something like that is an option for you?

Oxygen Sensor Spacer | Wags Engineering

theres also this one
Oxygen Sensor Plate Fuel Injection Mercruiser O2 EFI | eBay

Thats the solution I landed at. I'm fabricating a spacer to drop int between the log and the snail on my old Hardin Marine wet stacks.

How are you set up that gives goofy readings with water? My goal is to be able to collect numbers from the the sensor while underway on the lake, set up the carb using the O2 sensor and gauge, and pull the instrument off once I hit a satisfactory tune.

Thanks for your input. I really appreciate it.

Mike
 
#5 ·
One sensor or two?

Thanks for the response

Are you running a sensor on each side? Or just one side?

I'm machining a puck to adapt the sensor upstream from the riser. Trying to decide whether to run one or both sides. Pretty sure I will install a cheap narrow band sensor first before I put my nice wide band unit in there.
 
#8 ·
Good info.

I have a nice wide band unit on hand. Guess if I roast the sensor I can replace it for less than the cost of the whole unit, probably not that much more than a narrow band sensor.

I'm anxious to try it out. Not sure how likely it is to get wet yet.

Haven't got my adapter puck done just yet, probably next week.
 
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