con rod length increase

*malodeatul*

hello, what happen if cod rod length increase by few hundred microns?

Ranger Mike

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...

*malodeatul*

my supplier asking for 150 micron increase in length tolerance?

xxChrisxx

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.

atulmalode

Thanks Chris for your concern, It all about engine performance that concern me.
My liitle concern about what it will increase the piston thrust.

AlephZero

Quote by atulmalode

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.

2milehi

What is the rod length?

What is the piston top to cylinder head clearance?

atulmalode

Quote by 2milehi

What is the rod length?

What is the piston top to cylinder head clearance?

rod lenght-150mm
clearance-1.5mm

Highspeed

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.

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malodeatul	con rod length increase hello, what happen if cod rod length increase by few hundred microns?

Ranger Mike Recognitions: Gold Member Science Advisor	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...

xxChrisxx	con rod length increase 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.

atulmalode	Thanks Chris for your concern, It all about engine performance that concern me. My liitle concern about what it will increase the piston thrust.

2milehi	What is the rod length? What is the piston top to cylinder head clearance?

Highspeed	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.