.003 rod clearance

[1972ho]

What oil viscosity would you all recommend with rod bearing clearance of .003 and the mains at .0025-.0027 running a dry sump system.

[Abbottracingheads]

Anything you want. It will be fine.

[Warp Speed]

.003 rod bearing clearance?!?
What is the application?

[1972ho]

Drag racing I’ve been using 10w30

[statsystems]

Drag racing I’ve been using 10w30

I think warp wants to know what the engine is. That's plenty loose unless you are dealing with big throws and mains.

[cjperformance]

What oil viscosity would you all recommend with rod bearing clearance of .003 and the mains at .0025-.0027 running a dry sump system.

I'd start at 20 to 23 Cst at your oils race/operating temp.

[1972ho]

Warp it is ford SVO v-6 273 cid one reason I ask about the oil viscosity is sometimes I don’t have time to get the oil up to at least 150 because of of the dry sump and I was thinking I might need a lighter oil.

[modok]

2" shaft and bearings have a lot of eccentricity then .003 is very loose.

3" shaft and bearings have zero eccentricity then it might even be too tight.

[Newold1]

If that is really your rod clearance in that smaller journal size engine I think myself and few others here would think you might be better off using a set of +.0005 to .001 bearings and tightening things up just a bit.

[Old School]

The clearance is fine for drag racing. 10-30 10-40 either will work well.