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Grey Flash: Motorcycles that Matter
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<blockquote data-quote="davidd" data-source="post: 106517" data-attributes="member: 1177"><p>Tim,</p><p></p><p>I am not sure how well the 1-7/16 works as a down draft. It clearly had problems that the Factory had to fix due to the angle. With the replica I ran I did not have a problem, but I did not run it because I did not have enough time to do a lot of dyno runs to dial it in. I chose to run the 32 mm instead.</p><p></p><p>I think the big carb will fit under the tank, but it does "dead end" the bell mouth into the tank more than I liked. Because I could, I made a special tank cover to allow air to the bell mouth.</p><p>[ATTACH=full]26776[/ATTACH]</p><p>Coburn Benson ran the Flash with the big port head and an 1-1/2 GP in all of his races. The GP does not do downdraft well (except for the GP2) so he made a manifold to hold it.</p><p>[ATTACH=full]26777[/ATTACH]</p><p>This is probably the best way to run a vintage carb. Kurt Fisher ran 113.851 mph to qualify for the Daytona 100 miler in 1968. Coburn figured 38 MPG at full throttle and ran the race without a pitstop. Coburn got up early and grabbed one of the original 20 sheets that Daytona copied.</p><p>[ATTACH=full]26778[/ATTACH]</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 106517, member: 1177"] Tim, I am not sure how well the 1-7/16 works as a down draft. It clearly had problems that the Factory had to fix due to the angle. With the replica I ran I did not have a problem, but I did not run it because I did not have enough time to do a lot of dyno runs to dial it in. I chose to run the 32 mm instead. I think the big carb will fit under the tank, but it does "dead end" the bell mouth into the tank more than I liked. Because I could, I made a special tank cover to allow air to the bell mouth. [ATTACH type="full"]26776[/ATTACH] Coburn Benson ran the Flash with the big port head and an 1-1/2 GP in all of his races. The GP does not do downdraft well (except for the GP2) so he made a manifold to hold it. [ATTACH type="full"]26777[/ATTACH] This is probably the best way to run a vintage carb. Kurt Fisher ran 113.851 mph to qualify for the Daytona 100 miler in 1968. Coburn figured 38 MPG at full throttle and ran the race without a pitstop. Coburn got up early and grabbed one of the original 20 sheets that Daytona copied. [ATTACH type="full"]26778[/ATTACH] David [/QUOTE]
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Grey Flash: Motorcycles that Matter
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