Can Increasing Con Rod Length Lead to Detonation and Supplier Issues?

In summary, the conversation revolves around increasing the conrod length by 150 microns and its potential effect on engine performance and piston thrust. There are concerns about the piston hitting the cylinder head and the need for more information such as the rod length and piston top to cylinder head clearance. Additionally, there is a warning to consider detonation in the quench areas and to question why the supplier cannot hold tolerance any longer.
  • #1
malodeatul
5
0
hello, what happen if cod rod length increase by few hundred microns?
 
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  • #2
the closest pistojn to cylinder head clearance should be 0.050" ( 1250 microns) and having closer distance would mean the piston hits the cylinder head and bends the connecting rod. This is a V8 cast iron engine forged con rod spec and a general guide line so beware...
 
Last edited:
  • #3
my supplier asking for 150 micron increase in length tolerance?
 
  • #4
Well is an online forum really the place to be asking for advice? We don't know your design, we don't know what is important.

What happens if the conrod tolerance is increased by 0.15mm? The conrod could potentially be upto 0.15mm longer than previously spedified. That's really the only sensible answer we can give.
 
  • #5
Thanks Chris for your concern, It all about engine performance that concern me.
My liitle concern about what it will increase the piston thrust.
 
  • #6
atulmalode said:
Thanks Chris for your concern, It all about engine performance that concern me.
My liitle concern about what it will increase the piston thrust.

The thrust will increase by exactly -100%, if the piston hits the cylinder head.

As the others said, it needs MUCH more information to answer to your question.
 
  • #7
What is the rod length?

What is the piston top to cylinder head clearance?
 
  • #8
2milehi said:
What is the rod length?

What is the piston top to cylinder head clearance?

rod lenght-150mm
clearance-1.5mm
 
  • #9
Unless you are running a true hemispherical combustion chamber, you need to think about detonation in the quench areas. But, more importantly, you need to be asking why your supplier can't hold tolerance any longer.
 

What is a "con rod"?

A con rod, short for connecting rod, is a mechanical component in an engine that connects the piston to the crankshaft. It converts the reciprocating motion of the piston into rotational motion of the crankshaft.

What is the purpose of increasing the con rod length?

Increasing the con rod length can improve engine performance by altering the stroke of the piston. This can lead to higher torque and power output, as well as smoother engine operation.

How does con rod length affect engine performance?

The length of the con rod affects the stroke of the piston, which in turn affects the compression ratio and the amount of time the valves are open. A longer con rod can result in a longer stroke and a higher compression ratio, which can increase power output and efficiency.

Are there any drawbacks to increasing con rod length?

Increasing con rod length can also result in higher stresses on the engine components, as well as potentially affecting the balance and smoothness of the engine. It should only be done after careful consideration and calculations.

How do you determine the optimal con rod length for an engine?

The optimal con rod length depends on various factors such as engine design, intended use, and desired performance. It is typically determined through calculations and simulations, taking into account the engine's specifications and intended use.

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