Offshoreonly.com - Impacts of hitting rev limiter?

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Offshoreonly.com (https://www.offshoreonly.com/forums/)

- General Q & A (https://www.offshoreonly.com/forums/general-q-20/)

- - Impacts of hitting rev limiter? (https://www.offshoreonly.com/forums/general-q/333487-impacts-hitting-rev-limiter.html)

Ryan00TJ

01-07-2016 09:16 AM

Thanks for the replies. Just curious of everyone's opinions on this. With the 555 ECM cutting fuel when the revlimiter is reached, Whipple said " do not continually run on the rev limiter, continued abuse of the rev limiter can cause severe engine damage". Especially in my stock piston 496HO setup scenario.

BUP	01-07-2016 09:37 AM

^^^^ great for the reply so THX - and someone else that agrees with what I have said in the beginning of this post and if you search up here, I have said a bunch before.

And actually OEM merc and in all their OEM service manuals for ECM 555 and PCM 555 lists it drops spark hitting the REV limiter.

Trash

01-07-2016 11:04 AM

Quote:

Originally Posted by BUP (Post 4390611)

So unburned fuel continuously hitting a hot exhaust valve(s) is OK - would like to hear how that over time is fine.

.

Yes. Its hot air with fuel vapor. Not liquid fuel. It's hitting the exhaust valve regardless and we are talking milliseconds not immersion of a glowing valve into water.

class6

01-08-2016 05:16 AM

Quote:

Originally Posted by Ryan00TJ (Post 4391471)

Whipple raises the rev limit with their programing, Merc's limit is totally fine. BANG ON

Ryan00TJ

01-08-2016 09:27 AM

Quote:

Originally Posted by BUP (Post 4391477)

Bup, Thanks for the info. Good to get a spot on answer as to what actually happens when the 555 hits the rev limiter.

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