[TR] Dome oil

[Allen Hess]

On Mar 20, 2012, at 10:15 PM, triumphs-request at autox.team.net wrote:

> oil weight is quite literally the acceleration enrichment control.
> A thick oil will make it run richer by slowing the response of the  
> piston, increasing air velocity over the bridge drawing more fuel
> a thinner oil will let the piston rise more rapidly, shortening the  
> enrichment time.

I've no argument with the above but it always makes me ponder the  
following. Since a rising piston/needle also allows more fuel to flow  
due to a smaller needle diameter, I've always wondered about the  
seeming contradiction in above. Can someone elaborate a little more?

Allen