Engine torque specifications

[Dsm559]

I was wondering if you do a 2.3 stroker with a .020 over bore, would you still torque all the nuts and bolts to the 2.0L specifications?

 

[donniekak]

Torque to the specs provided by the fastener manufacturer.

Why would they be any different?

 

[Dsm559]

Because it's not gonna be a 2.0 no more. So just wanted to know

 

[Dsm559]

Torque to the specs provided by the fastener manufacturer.

Why would they be any different?

I'm talking about cars here. Not machining

 

[donniekak]

I'm talking about cars here. Not machining

If a rod is machined to be round at 43 ft/lbs with x fastener, it doesn't matter what engine its in, it gets torqued to 43ft/lbs. If the main bearing bores are machined to be round with x fastener at 60ft/lbs, that's what they are torqued to. If a m12x1.25 headstud is designed to achieve maximum clamping force without permanent deformation at 95-110ft/lbs, that's what you torque it to.

 

[Dsm559]

Ok. So just make this short. I would just torque down all nuts and bolts to the 2.0 specs?

 

[donniekak]

Go by the information provided by the manufacturer of your part. An eagle rod gets torqued the same whether it's in a 2.0, 2.3, 2.4, etc.

There should be data that comes with every part you buy. For fasteners it's very important to torque them to the recommended torque, or for rod bolts, the recommended stretch if possible.

If you installed aftermarket main bearing fasteners you should also have the main bores checked with them installed.

 

[Lowestform]

Always go by what the manufacturer of the part intended. It's almost critical to have a FSM around when doing anything like this.

I'm a mechanic and I love and breathe the FSM.

 

[Dsm559]

Oh ok thanks guys. I've always thought that no matter what part you put in the engine it has to be in the engines factory specs.

 

[donniekak]

Oh ok thanks guys. I've always thought that no matter what part you put in the engine it has to be in the engines factory specs.

Not necessarily. When you install forged Pistons, you need to follow the recommendations of the manufacturer for the piston to cylinder wall clearance. The specs for stock Pistons are to tight. The same with the factory ring gap specs. A higher horsepower engine will have looser ring gaps than stock to keep them from butting.
Arp l19 head studs will be torqued to a different spec than the stock headbolts. There are a lot of specs that will be different.

 

[Dsm559]

Not necessarily. When you install forged Pistons, you need to follow the recommendations of the manufacturer for the piston to cylinder wall clearance. The specs for stock Pistons are to tight. The same with the factory ring gap specs. A higher horsepower engine will have looser ring gaps than stock to keep them from butting.
Arp l19 head studs will be torqued to a different spec than the stock headbolts. There are a lot of specs that will be different.

Ok. I will have to do more research thanks agian.