[Rovernet] SU dashpot oil

[Steven Dibdin]

Hey Tom

I always have used 20w50 oil in my HS8s and (now fitted) HIF6s. That seems a pretty good weight for damping without getting a lean spot on acceleration. 

Incidentally, I read on the Rover forum that Rover used the 2" carbs on the 2000TC because the 1.75" carbs (HD6 and HS6) didn't like the harmonic vibration of the engine which caused piston fluttering in the carb at speed resulting in a lean mixture at higher engine revs. The more complex HIF6 carbs seem to be fine with it hence their use on 2200TC engines. 

Best,

Steven 

Sent from a small screen, please excuse any typing errors. 

> On Apr 11, 2017, at 08:51, Tom Rymes via Rovernet <rovernet at rovernet.org> wrote:
> 
> Rovernetters,
> 
> While tending to various bits on my 2000TC, I checked the oil in the dashpots of the SU HD8s (yes, HD). It seems awfully thin, and perhaps low, too. The maintenance manual says to put 20W oil in them, but I usually put 20w50 engine oil in my other British cars.
> 
> I know that Rover SUs are often different in some subtle ways than other SUs (piston shapes, etc), and I know that this engine has a lot more carb on it than others of similar displacement, so I thought I'd ask if there is a consensus on what oil to use.
> 
> Many thanks,
> 
> Tom
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