Optimium clone head temp

All these different ideas on the ideal CHT temperature! Oh my!
Never had any those problems with the EGT.
Al not everyone knows that the amount of work done in an internal combustion engine is dependent on Delta T. The higher it is the more work done.
It is Usually taught in college level Thermal Dynamics. Usually around the 3rd. year engineering classes.
So it is not something that everyone understands or is even exposed to.The same way that I don't have a clue on how to electrically wire a house or paint a car. I never studied it.
On some of the engine that are being raced in the stock classes, I don't think you can even change the jet size? If that is the case then It would be very hard to change the EGT ? If I am wrong in this assumption. Then I am sure that someone will correct me. Believe it or not. I have been wrong in the past. My wife reminds of this often!
But I cannot think of running a racing engine without knowing the EGT. Once you do, It makes a difference.in how you tune the engine.
 

alvin l nunley

Premium User
Al not everyone knows that the amount of work done in an internal combustion engine is dependent on Delta T. The higher it is the more work done.
It is Usually taught in college level Thermal Dynamics. Usually around the 3rd. year engineering classes.
So it is not something that everyone understands or is even exposed to.The same way that I don't have a clue on how to electrically wire a house or paint a car. I never studied it.
On some of the engine that are being raced in the stock classes, I don't think you can even change the jet size? If that is the case then It would be very hard to change the EGT ? If I am wrong in this assumption. Then I am sure that someone will correct me. Believe it or not. I have been wrong in the past. My wife reminds of this often!
But I cannot think of running a racing engine without knowing the EGT. Once you do, It makes a difference.in how you tune the engine.
As popular as they are, I'm thankful that everybody doesn't run in the box stock classes. "Fixed jet" is not what I read in the Briggs & Stratton rulebook. There is some leeway. Even after that, people adjust the float level. Same as a different jet. But I'm glad to hear you like EGT, at least I think that's what you said.

By the way, .0002" change in jet size would be necessary for a 1% change in air density. There is room to tune the carburetor even with a fixed jet rule. It might be interesting to know exactly how precise Briggs & Stratton jets are in size and flow. The company where I once worked had a need for rocket engine jets, very similar to Briggs & Stratton jets. They were CAD/CAM designed and machined on a Swiss CNC lathe. Of the 200 jets we had manufactured, then flow tested, we found about 14 different flow rates. With more precise testing methods, we might have found more. It would be interesting to perform that same test on say, 100 Briggs jets. There is a carburetor manufacturer in Europe (forgot the name) that marks their jets with flow numbers rather than sizes. Makes me wonder, if they think it's that important, why don't we do the same thing?
 

mike97760

Premium User
Al I think what is being discussed as box stock in most of these threads refers to Predator motors only. Theyre everywhere and seemingly growing faster than any other classes.
 
Talking about briggs rules and box stock predators and the dude is asking about a CLONE. Besides egt is not permitted in most stocker classes. So a lot of people use head temp as a directive as you cannot use an egt probe in this case.

Al you are so dense its not even funny. You have been told before about the rules regarding egt and cht. And recognize what the OP is asking about. AKRA Clone is a purpose built engine at this point. Far cry from box stock and totally unrelated to briggs and thier rules.

Now where is that squirrel emoji when we need it.......
 
Only a fool would call Al dense.
Well after reading his posts for over 10 years I have a pretty good idea of how smart the man is and what he has done for karting in general, but his skull must be thicker than tungsten when it comes to certain topics. Hence why I said dense.
 

alvin l nunley

Premium User
It appears we have conflicting opinions on certain subjects, I won't give in and you won't give in, for this you call me "dense"?

Tell me about even one subject where you consider me dance! Give me your reasons why and I will give you my reasons why.

How about this; give me even one occurrence when I accuse somebody of being dance because they disagreed with me!

Responding with pejoratives simply because somebody disagrees with me is not my style!
 
Im half and half on alot with you I agree with some such as dyno tuning with egt but on track use its not permitted and most use cht because of it and do not have a dyno themselves to tune with.

You want another example? Go back a few years and your posts about dirt oval chassis setups. Reading and studying is one thing but experience beats all in our world. You would argue your points to no avail and still somehow thought you were correct after multiple experienced people told you that you were wrong.

I do not argue the fact that you are an extremely smart individual but having no experience with certain things and thinking you understand it is why I used the term dense.

You are not dense for disagreeing but the fact that you argue when you are even shown facts as to why you are wrong. Perhaps our definitions of dense are different. I see it as any individual who cannot see anothers point of view or cannot accept defeat even after having proof they are incorrect.
 
380-420

is what I run mine at. Not going to argue with anyone it was just what was recommended by the engine builder and Jody at ARC. I used a temp lead long enough to know how much I had to tape to get that temp then I took it off.
 
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