What grade fuel are you running?

[bruceb58]

Re: What grade fuel are you running?

Not really, aftermarket has been making these for years
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Yes, with converted auto fuel injections.

So you were talking about converted FI or stock ones from Mercruiser and Volvo? Please show me a stock FI with O2 sensors from Volvo or Mercruiser before cats.

 

[oldjeep]

Re: What grade fuel are you running?

Please show me a stock FI with o2 sensors from Volvo or Mercruiser before cats.

Don't know if they exist, I'm just surprised that they would bother offering an open loop system when it would have been so easy to build a standard closed loop system. But I guess boats are still 20 years behind cars in a lot of ways.

 

[bruceb58]

Re: What grade fuel are you running?

Don't know if they exist, I'm just surprised that they would bother offering an open loop system when it would have been so easy to build a standard closed loop system. But I guess boats are still 20 years behind cars in a lot of ways.

Mainly because the main benefit is emissions with a secondary benefit of a small increase in fuel economy. The downside is more complication and cost so closed loop systems weren't added until they were basically forced to.

 

[Bill3434]

Re: What grade fuel are you running?

Any actual advantage to running a higher octane fuel instead of basic 87?

Yea my 1977, 70hp johnson likes 89 octane better. I don't think she cares whether it has alcohol in it or not. Been my experience older engines and engines that run wide open prefer the higher stuff. The guy that rebuilt and works on her did tell me not to put the high octane in.

 

[Scott Danforth]

Re: What grade fuel are you running?

Oohh another hand of popcorn. Now we add FI vs Carb to the conversation.

Bruce, you were right, and it was the EPA that demanded cats on boats. I guarantee that the folks at VP and Mercruiser didn't want to go that route

and yes as a side note, I even changed my jets, power valve and secondary spring

 

[H20Rat]

Re: What grade fuel are you running?

Mainly because the main benefit is emissions with a secondary benefit of a small increase in fuel economy. The downside is more complication and cost so closed loop systems weren't added until they were basically forced to.

additionally, auto FI systems run in open loop during high load conditions. 90% of a boat's running conditions would put an automotive engine management system into open loop. No need for the complication of closed loop when you are rarely going to be using it.