knock/detonation sensor

[Slimm]

Is there a way to detect detonation/preignition without having an engine management computer?

Maybe a sensor that goes in the head and activates a light on the dash or something?

Surely they're is something for outboards because I cannot for the life of me see how anyone would hear it like we do in a car, and by the time you hear it the damage could be done anyway.

Slimm

[David - WI]

This is where I would start: http://www.knocklite.com/

You need to supply an appropriate knock sensor probe (preferably one tuned to the bore size of your engine) but that's not hard; Im thinking the stock Merc unit might even work but haven't looked into that yet.

[Slimm]

This is where I would start: http://www.knocklite.com/

You need to supply an appropriate knock sensor probe (preferably one tuned to the bore size of your engine) but that's not hard; Im thinking the stock Merc unit might even work but haven't looked into that yet.

I saw that, but it seems they are no longer available. Followed the links for buying but no luck. I'll keep looking around.

Slimm

[David - WI]

Seriously? I just looked at buying one last week, they were $112 but now I don't remember what website I saw them on.

[David - WI]

These guys still show 50 in stock, but wait til I order mine before you order yours... in case there's really only 1 left!

http://ajwperformanceproducts.com/store/#!/~/product/id=4478416

[wired247]

http://www.ebay.com/itm/825164A1-DET...97a7b7&vxp=mtr

Everything you need in a a box. Don't know if they work or not but they seem to have no problems in car engines.

[David - WI]

http://www.ebay.com/itm/825164A1-DET...97a7b7&vxp=mtr

Everything you need in a a box. Don't know if they work or not but they seem to have no problems in car engines.

That doesn't get you a display or warning of any kind; so if it is knocking... you just drive around retarded & rich (like a lot of other boaters!). LOL

[Slimm]

These guys still show 50 in stock, but wait til I order mine before you order yours... in case there's really only 1 left!

http://ajwperformanceproducts.com/store/#!/~/product/id=4478416

I sent off an email to the people at TurboXS and they said they used to make them but discontinued them a few years ago. Not sure what caused the discontinue decision, maybe lack of sales.

Slimm

[wired247]

That doesn't get you a display or warning of any kind; so if it is knocking... you just drive around retarded & rich (like a lot of other boaters!). LOL

By the time you respond to an audible alarm youve melted a piston. Been there. Automatic detonation retards work faster than you do.

[allstock]

Yamaha OX66 has a knock sensor, if that helps ya!

[David - WI]

I sent off an email to the people at TurboXS and they said they used to make them but discontinued them a few years ago. Not sure what caused the discontinue decision, maybe lack of sales.

Slimm

OK then, I'll let you know how it works in a couple days... I just ordered mine.

I've been eyeing them for years and the reviews were mainly positive but I never pulled the trigger because I didn't really need one... but if they stopped making them then I need at least one (maybe a couple) before they're all gone.

[David - WI]

Or not... I guess:

This item no longer exists, would you like a full refund?

[wired247]

One of the issues you will run into is that detonation is too fast to signal a light or buzzer if you are going strictly off the knock sensor output. Sure you can wire it similar to the way you set up a peak hold multimeter and have the horn or light go off and keep going off once you get the first hint of detonation but that doesnt tell you how many detonation hits youve gotten and it doesnt do anything about the root problem of having the detonation in the first place. I know theres a general aversion to having "black boxes" on these motors but knock sensors have been around for years and the technology is pretty good.

[2jz]

Is there a way to detect detonation/preignition without having an engine management computer?

Maybe a sensor that goes in the head and activates a light on the dash or something?

Surely they're is something for outboards because I cannot for the life of me see how anyone would hear it like we do in a car, and by the time you hear it the damage could be done anyway.

Slimm

I think this will help you more with what need for your setup
http://www.screamandfly.com/showthre...r-install-300x

[David - WI]

The Knocklite was a "smart" sensor that could distinguish between "light" and "severe" detonation and it's sensitivity varied with rpm. But you're talking about using it for "engine protection" and I'm talking about using it for tuning compression, timing, octane, and jetting. Then hook up the factory detonation box for engine protection.