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Brian · 09-20-2013, 01:10 AM

I think the reason there was no conclusive answer is because at any given RPM, there are other variables to consider; the throttle opening and load on engine being two. Altitude would be another factor.Try fitting a vacuum gauge into your wiper circuit somewhere in the car and go for a drive, observing said gauge.

09-20-2013, 01:10 AM	#2
Brian Senior Member Join Date: May 2010 Location: Masterton, New Zealand Posts: 3,836	Re: Vacuum 221 cu in stock I think the reason there was no conclusive answer is because at any given RPM, there are other variables to consider; the throttle opening and load on engine being two. Altitude would be another factor.Try fitting a vacuum gauge into your wiper circuit somewhere in the car and go for a drive, observing said gauge.