rebuild/connecting rod?

[ApullinV6]

When connecting rods are attached to piston, I know that certain markings on piston are suppose to go with marking on rod towards front of engine. Is this critical? I have heard that if rod is opposite that it has be proven that race cars have picked up on their et

Reason I ask this is some of my rods are, lets say 180 deg out. Do i need to press pin out and turn rod so that markings on rod match front of piston?

I noticed that even my stock rods were about a 50/50 match with the rod being installed the right way.

I just worry about messing a piston up trying to press pin out?.?

 

[blown okie]

what?

 

[ApullinV6]

I have a friend that runs stockers in the nhra and ihra and they have actually put connecting rods/pistons in facing to rear of block and have picked up on e.t. Only draw back is they say that you may hear somewhat of a piston slap. Take in mind these cars are not street cars.

Other than that, Thats what I say, WHAT? That's why I'm asking the ??

 

[jhanson1750]

I have seen this as well. It was not the rod reversal that showed power gains. The piston being "faced" backwards can increase base compression and rod angle due to the piston pin being offset from the true centerline of the piston. So by running the pistons "backwards" it can move the piston up in the bore and it can put the connecting rod at a lesser angle (closer to 90 degrees) from the crank throw at a given crank angle. B U T these are at a cost. The increase in noise until warm is due to the changes in these angles. The piston skirt will see aggresive wear and the distinct possibility of fracture if the engine is not allowed to fully warm up before it is put under a load. These things are OK on a track only car but are a real pain to keep to on a street car. The power increases on a a turbo-car can be had with 1-2 pounds of boost. I would recommend that you NOT do this on a street car and NEVER on a boosted one. Just my .02 GOOD LUCK Jon Hanson

 

[ApullinV6]

Thanks Jon,

I'm new at this rebuild thing..got to say, it's my first. I've rebuilt small engines but thats it. It's a good learning experience and I hope I don't do it again anytime soon though