Originally Posted By: pwr2tow
Originally Posted By: Clevy
K. I built my Harley so I'm gonna take a stab at why 0w-xx aren't a good idea.
I noticed that my pistons weren't as tight in the jugs compared to any v8 I've ever had a hand on. So that tells me a 0w in a Harley is gonna get consumed at start up, until the piston expands enough to tighten in the bores,which is why a 20w or 15w is suggested.
I'm just using some sense and experience although I could be wrong.
Sorry I missed your first post. Makes perfect sense to me. But now I have to ask what about the rest of the tolerances within the engine such as bearings, journals, valve guides etc. etc.
Everything tightens up. But air cooled engines run much hotter than their liquid cooled counterparts which is why I think the minimum 40 grade should be adhered to.
Originally Posted By: Clevy
K. I built my Harley so I'm gonna take a stab at why 0w-xx aren't a good idea.
I noticed that my pistons weren't as tight in the jugs compared to any v8 I've ever had a hand on. So that tells me a 0w in a Harley is gonna get consumed at start up, until the piston expands enough to tighten in the bores,which is why a 20w or 15w is suggested.
I'm just using some sense and experience although I could be wrong.
Sorry I missed your first post. Makes perfect sense to me. But now I have to ask what about the rest of the tolerances within the engine such as bearings, journals, valve guides etc. etc.
Everything tightens up. But air cooled engines run much hotter than their liquid cooled counterparts which is why I think the minimum 40 grade should be adhered to.