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Re: More than you need to know about gauges
Sorry for the long delay, Gisli.
Gisli Ottarsson wrote:
> Wow! Thanks for the generous info, Igor.
> Two question, for clarification, if I may:
> 1) You cite the following specs:
> VDO 150 921 -30" Hg to +25psi and -1 bar to +1.5 bar
> I presume that the +1.5 bar is relative to atmospheric pressure,
> i.e., that it corresponds to a 2.5 bar reading of the in-dash
> The reason I ask is that I had conviced myself that a 20psi
> gauge would be inadequate but if this corresponds to 1 Atm + 20 psi
> then this is plenty (for my application).
Correct. That's what I had in my '89 200TQ. Ran it at 17psi. At 20psi
the engine would start detonating (too lean a mixture - very dangerous).
> 2) In your experience, when a gauge is advertised having a 52mm dia,
> is this the diameter of the outer edges of the frame or is this the
> size of the mounting hole?
It's the mounting hole DIA.
Two turbo quattros.