Re: Optimum air / fuel ratio for marine engine
 

EGT Temp. vary wildly depending on how far the prob is away from the exhaust valve.On a dyno the probes are usually 6 inches from the valve.This is hard to do on a marine water jacketed header. I had mine in the exhaust port next to the header flange,i saw temps in the 1700*range.The dyno showed 1300*with the probs 6 inches downstream !

Re: Optimum air / fuel ratio for marine engine
 

To be blunt, given the variability of EGT measurements emntioned as a function of the distance from the combustion chamber, it would seem that all it is good for is cylinder to cylinder EGT balance check. Are there EGT numbers for that?

Re: Optimum air / fuel ratio for marine engine
 

Some helpful information regarding EGT and tuning parameters;
http://www.maxracesoftware.com/egt_probes.htm

Bob

Re: Optimum air / fuel ratio for marine engine
 

Incredible .. the stuff you come up with ....great info ...m

Re: Optimum air / fuel ratio for marine engine
 

Thank you gentlemen all!

Re: Optimum air / fuel ratio for marine engine
 

I figure about .5lb/hp*hr. You can add 10-20% margin and that should work out fine. So for 100 hp do:

100*.5= 50 lb/hr

+ 20% = 60 lb/hr

You could just multiply that by hundreds and that should get you there. So, 700 hp = 420 lb/hr or about 60 gal/hr or 1 gal/min. Just be careful when sizing your fuel pump to know the operating pressure range for the pump. A pump curve is always best to know that your fuel delivery will be adequate at your operating pressure.

Rene

Re: Optimum air / fuel ratio for marine engine
 

Im running a Revolution Marine aluminum exhaust manifolds. Is there any way to mount a EGT sensor in this type of exhaust?

Re: Optimum air / fuel ratio for marine engine
 

Yes,PM Nordic95 here on the board.He had a post on how he mounted an O2 sensor in his Revolution Manifolds.

Laken

Re: Optimum air / fuel ratio for marine engine
 

If the flange is thick enough where it mounts to the head you can drill there.Most EGT probes are 1/8 pipe thread,about 5/16". Be sure you don't get into the water jacket , or you're S______!

Re: Optimum air / fuel ratio for marine engine
 

Thanks Bob, Good Read!!

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