Offshoreonly.com - Knock sensor needed?

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s022mag

03-17-2019 11:08 AM

Knock sensor needed?

I going through both motors and when I had the blocks honed and hot tanked the one knock sensor was destroyed removing it. Are they even needed in the 500EFI motors. If so will a regular GM BBC one work instead of the Mercury Racing one.

vee robb

03-18-2019 07:12 PM

I would keep it. The 500EFI is a speed density system and has limited information to develop it's strategies, also removing it will most likely put it into "safe mode" and pull all of the timing out I don't know if they are standard GM knock sensors, but I would not be surprised if they are.

Griff

03-18-2019 08:35 PM

Yes, you need it. It helps control the timing. I wouldn't try and skimp on this. The wrong one could trash an engine.

s022mag

03-19-2019 10:53 AM

From what I’m seeing there around 150 from mercruiser. Is there any after market that will work just the same for less?

F-2 Speedy

03-19-2019 10:55 AM

I think I have a used 1 or 2 these are OE mercury

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