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pnicholson
Joined: 04 Jun 2011
Posts: 46
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 Posted: Tue Apr 25, 2017 4:28 am Post subject: HS6 primer upgrade questions |
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Gentlemen,
plane currently in for annual. We had the primer line off as it was crimped at 90 degrees resulting in restricted flow.
It's a pretty odd set up for this line. It comes out of the firewall, heads 90 degrees left, then doubles back right, and then another 90 degree bend into the intake manifold. Any thoughts of running a steel braided line right from the firewall straight in?
The primer "atomizer" is pretty dreadful. We tested it, and really, gas just streams out similar to holding your thumb on a water hose. There is no atomizing, aerosol-izing, or misting of fuel. Is there an after-market part that would do a better job?
Given the poor atomization, we started wondering if one shouldn't prime and 'press start' simultaneously (dragging gas into the cylinders) as opposed to priming earlier and having the gas collect at the bottom of the intake header. I suspect in the South (hotter) this isn't an issue, but in the North, gas doesn't create as much vapour.
Anyone performed any upgrades to this system?
Thoughts?
Phil
(C-FEPN - Ottawa)
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Vic
Joined: 12 Aug 2008
Posts: 113
Location: Southern Bavaria
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| Posted: Wed Apr 26, 2017 4:12 am Post subject: Re: HS6 primer upgrade questions |
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Hi Phil,
I did not like the design of the jet, so was thinking along the lines of jets used in central heating oil burners. There is a taper top seated inside with very fine grooves that do not point exactly to the center. That is to produce some swirl and resulting in a cone of oil spray out of the tiny jet. For primer application all details can be much more rough than for burner use. You have to experiment a little with water from your water tap at home to see what it does. But it is no very big deal to make up a jet for your purpose and maybe use some part of a burner.
Vic
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