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Date:         Sun, 10 Jun 2001 13:45:23 -0800
Reply-To:     Mark Keller <kelphoto@ISLANDNET.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Mark Keller <kelphoto@ISLANDNET.COM>
Subject:      Re: Digijet Timing Info
Comments: To: Mark Ingalls <ingalls_mark@hotmail.com>
Content-Type: text/plain; charset=us-ascii

Great Post Mark!,

I think more people will get curious about their max timing as a result. This has got to help other people, as I've heard more that a couple of people with crossed vacuum hoses and such, which lowers the amount of timing. No wonder we're hearing so much about low power. BTW the horsepower numbers I crunched seem to suggest that the I-4 people find so powerful is not really able to produce any additional power over the waterboxer until it is revving past 5000 RPM.

Sincerely,

Mark Keller 91 Carat.

> Mark Ingalls wrote: > > Hello Volks, > > There has been some discussion on the list lately about the Digijet > vans and the 5 degree atdc timing. > > I run my van at 2 atdc and it runs fine for me, power is fine and 18 > mpg summer. > > I was curious about what the total advance would be with this close to > stock setting. > > So when I found a free hour and 1/2 today I took the spark plugs out > so it would be easier to turn the engine over. Then I found my plastic > compass with degree markings on it and marked the very rear pulley at > 30, 35 and 40 degree's. It had a factory mark on it already that > looked to be close to the Top Dead Center . ( I have the power > steering pulley.) > > After I had marked the pulley and put everything back together I > started the van and warmed it up. I had all vacuum hoses in place and > the idle stabilizer in service. > > At idle I still had 2 atdc. At 1500 rpm I had around 7 btdc. At > 2500 I had 30 btdc. At 3000 I had 45 btdc. > > My only uneasiness in this report is that it is somewhat difficult to > find tdc on the rear pulley by using a straight edge and eyeballing > it, but I wouldn't think I would be that far off. I was only a couple > degrees before the factory mark on the rear pulley when I used the > compass to mark the rear pulley. And from my experience building > engines I would assume the mark on the rear pulley would be TDC if the > pulley is keyed on the crank. > > I had taken my distributor apart a year ago when I had idle surging > trouble, so I assume the centrifical parts are ok. Springs in place > and weights lightly greased. > > If other people would run this test sometime, it would be interesting > to hear your results. > > peace, > Mark Ingalls > Nebraska City, Nebraska > 85 Vanagon GL 'Aimee Airheart' > 75 Beetle 'Salvation'


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