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Engine temp recommendations please.


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#1 StephenLilly

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Posted 05 October 2018 - 08:26 AM

Built a 12g4 jae rigger recently (first boat). I've got about a gallon of nitro through it and am nearing the point of wondering how lean it will run but don't won't to over do it. Any guidelines on engine temp ranges that are recommended? The setup is .18 os turbo engine, os p3 turbo plugs, torco 25% nitro 22% lube, 1440 prop. Thank you



#2 MattMurany

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Posted 05 October 2018 - 11:44 AM

Around 200F and don't build heat by leaning down the needle. Prop load, pipe length and cooling to the motor are what you want to work on to get the motor up to temp.



#3 RonShaw

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Posted 05 October 2018 - 12:28 PM

Around 200F and don't build heat by leaning down the needle. Prop load, pipe length and cooling to the motor are what you want to work on to get the motor up to temp.

Matt is on it. We recommend 180-200 degrees measured at the glow plug as optimum running temps.



#4 StephenLilly

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Posted 05 October 2018 - 02:00 PM

Ok thank you guys for your input and conformation!

#5 Jim Recker Jr.

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Posted 06 October 2018 - 07:29 PM

Around 200F and don't build heat by leaning down the needle. Prop load, pipe length and cooling to the motor are what you want to work on to get the motor up to temp.

 

Matt, Terry Keeley once told me squeeze off the water intake and open the needle (let it eat) is this the same thing you are talking about? I guess over cooling can work against us sometimes. 



#6 mr_fons

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Posted 07 October 2018 - 08:24 AM

So is this an ideal temperature for all motor sides?

 

Fons



#7 MattMurany

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Posted 07 October 2018 - 12:18 PM


Around 200F and don't build heat by leaning down the needle. Prop load, pipe length and cooling to the motor are what you want to work on to get the motor up to temp.

 
Matt, Terry Keeley once told me squeeze off the water intake and open the needle (let it eat) is this the same thing you are talking about? I guess over cooling can work against us sometimes. 

Yes

#8 MattMurany

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Posted 07 October 2018 - 12:22 PM

So is this an ideal temperature for all motor sides?
 
Fons


This is more for 12 and 21s. The larger engines don't need to run quite that hot. More like 180 for 45 and up. Hotter engines can burn more fuel which is the goal.