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Classic Goldwing Technical Forums
Engine & Fuel System Modifications
Single Carb. Conversion, VW Plenum & Modding, the OEM Manifolds
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<blockquote data-quote="Jungo" data-source="post: 98387" data-attributes="member: 2588"><p>I read this info on a VW mod webpage. Hope can help. <a href="https://www.christopherwking.com/projects/aircooled-vw-fuel-injection/" target="_blank">https://www.christopherwking.com/projects/aircooled-vw-fuel-injection/</a></p><p></p><p>====================================================</p><p><strong>A few rules of thumb when constructing a plenum and intake runner system:</strong></p><p><strong></strong></p><p> Plenum = or 1.5-2 times bigger than a single cylinder volume OR 2.25-2.5 times a single runner volume</p><p> Single runner volume= single cylinder volume. If this cannot be accomplished, it can be compensated for by adding more cc’s to the plenum</p><p> <strong>Runner diameter= intake valve diameter minus the diameter of the valve stem (you want good flow from runner to port)</strong></p><p> Throttle Body Diameter= 1.25 to 1.5 times the runner diameter</p><p>====================================================</p><p></p><p>Goldwing GL1000, GL1100 Intake Valve Specs:</p><p>Intake Valve diameter= 1.496"</p><p>Intake Valve stem = .2595"</p><p></p><p>1.496-.2595 = 1.2365"</p><p></p><p>My pipes are 1 3/16" ID (1.1875" ID) so I'm planning keep the pipes size and reduce a little the the end to increase the flow. I'll post results as soon as I do the mod to the pipes, unless you guys see I'm doing something wrong.</p></blockquote><p></p>
[QUOTE="Jungo, post: 98387, member: 2588"] I read this info on a VW mod webpage. Hope can help. [url]https://www.christopherwking.com/projects/aircooled-vw-fuel-injection/[/url] ==================================================== [b]A few rules of thumb when constructing a plenum and intake runner system: [/b] Plenum = or 1.5-2 times bigger than a single cylinder volume OR 2.25-2.5 times a single runner volume Single runner volume= single cylinder volume. If this cannot be accomplished, it can be compensated for by adding more cc’s to the plenum [b]Runner diameter= intake valve diameter minus the diameter of the valve stem (you want good flow from runner to port)[/b] Throttle Body Diameter= 1.25 to 1.5 times the runner diameter ==================================================== Goldwing GL1000, GL1100 Intake Valve Specs: Intake Valve diameter= 1.496" Intake Valve stem = .2595" 1.496-.2595 = 1.2365" My pipes are 1 3/16" ID (1.1875" ID) so I'm planning keep the pipes size and reduce a little the the end to increase the flow. I'll post results as soon as I do the mod to the pipes, unless you guys see I'm doing something wrong. [/QUOTE]
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Classic Goldwing Technical Forums
Engine & Fuel System Modifications
Single Carb. Conversion, VW Plenum & Modding, the OEM Manifolds
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