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Classic Goldwing Technical Forums
Engine & Fuel System Modifications
Yet another single carb thread :) Dan's 1" runners from plenum to custom head flanges
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<blockquote data-quote="dan filipi" data-source="post: 99050" data-attributes="member: 54"><p>The reason I'm saying this and want to describe what I've found in my 1" runners is to maybe help others with this information in building a manifold.</p><p>It may help someone or it may not but it also may help give an idea what to watch for somewhere along the line in fitting pipes and coupling them.</p><p></p><p>So what I've built is this:</p><p></p><p><img src="https://www.classicgoldwings.com/forum/gallery/image.php?album_id=2073&image_id=21210" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>I was not very careful in fitting the pipes into the plenum outlets because I had the idea all along I'd seal any spaces with epoxy.</p><p>What I mean is, the 1" pipes extend <strong>inside</strong> the plenum outlets.</p><p>The way it sits now is there is a space between the plenum wall and the 1" pipe, maybe an 1/8" or so.</p><p></p><p>(No comments on my 1 dimensional drawing please, I can't draw.)</p><p></p><p><img src="https://www.classicgoldwings.com/forum/gallery/image.php?album_id=2073&image_id=21292" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>I've found that raw gas accumulates in this space.</p><p>Makes sense to me now because the fuel air charge is smacking right into that pipe and interrupting the flow.</p><p></p><p>I'm pretty sure this is also making it so the idle mixture has to be set a 1/2 to 1 turn richer than it should be, which is why I'm saying good looking plugs don't necessarily mean the manifold and carb mock up are performing the best they could. Mine are tan to very light tan which would seem to indicate the mixture that <strong>does</strong> get to the cylinder IS good, but may not be consistent.</p><p></p><p>I also experience some random "loading up" at idle speed which would lower the idle, at times the idle would randomly speed up too. My guess then is this raw gas gets sucked in once it's accumulated to a point.</p><p></p><p>So anyway, I hope this helps someone.</p><p>It was sort of a knock on the head "Duh" when I pulled the carb and saw raw gas sitting there.</p></blockquote><p></p>
[QUOTE="dan filipi, post: 99050, member: 54"] The reason I'm saying this and want to describe what I've found in my 1" runners is to maybe help others with this information in building a manifold. It may help someone or it may not but it also may help give an idea what to watch for somewhere along the line in fitting pipes and coupling them. So what I've built is this: [img]https://www.classicgoldwings.com/forum/gallery/image.php?album_id=2073&image_id=21210[/img] I was not very careful in fitting the pipes into the plenum outlets because I had the idea all along I'd seal any spaces with epoxy. What I mean is, the 1" pipes extend [b]inside[/b] the plenum outlets. The way it sits now is there is a space between the plenum wall and the 1" pipe, maybe an 1/8" or so. (No comments on my 1 dimensional drawing please, I can't draw.) [img]https://www.classicgoldwings.com/forum/gallery/image.php?album_id=2073&image_id=21292[/img] I've found that raw gas accumulates in this space. Makes sense to me now because the fuel air charge is smacking right into that pipe and interrupting the flow. I'm pretty sure this is also making it so the idle mixture has to be set a 1/2 to 1 turn richer than it should be, which is why I'm saying good looking plugs don't necessarily mean the manifold and carb mock up are performing the best they could. Mine are tan to very light tan which would seem to indicate the mixture that [b]does[/b] get to the cylinder IS good, but may not be consistent. I also experience some random "loading up" at idle speed which would lower the idle, at times the idle would randomly speed up too. My guess then is this raw gas gets sucked in once it's accumulated to a point. So anyway, I hope this helps someone. It was sort of a knock on the head "Duh" when I pulled the carb and saw raw gas sitting there. [/QUOTE]
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Classic Goldwing Technical Forums
Engine & Fuel System Modifications
Yet another single carb thread :) Dan's 1" runners from plenum to custom head flanges
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