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Thread: Merc V6 History
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08-01-2022, 06:58 PM #691
The big advantage of loop charging is they tolerate high compression ratios better, the combustion chamber does not have the compromise shapes required in a crossflow. Crossflow dominated US fishing/pleasure outboards for a long time because they have a lot of midrange torque and often better idle than loop charged motors; and they used to be cheaper to build. Modern casting techniques reduced the manufacturing costs of loop charge construction and a new era began.
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08-02-2022, 07:18 AM #692Living in the Freedom provided by Bud Conner and his fellow warriors.
R.I.P. my Heathen Brother
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08-02-2022, 08:54 AM #6935000 RPM
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08-02-2022, 10:00 AM #6945000 RPM
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This is just my opinion but back in the early days of outboard engines the really important things were light weight and low cost. People carried their outboards around a lot. I don't think fuel economy or high specific power was a big concern at all. The loop scavagned two stroke wasn't invented until about the middle 1920's so cross scavaging had to be used early on. It also allowed for a light weight engine because the cylinders could be placed very close together. And it was also easily die cast making the cost to manufacture low. Then it was just natural to keep making cross-flow engines as number of cylinders and hp's went up. loop scavaging is much more difficult to make efficient transfer passages and usually requires the block to be cast by permanent mold or sand casting. Use of the heavy blister liners and die casting is only acceptable in larger engines where weight is not a big concern because they're being lifted by forklifts,ect. but they do allow for an efficient die-cast design. then later salt cores and lost foam eliminated the heavy cast iron liners so we now have the best of both worlds.
Never up --- never down!!
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Kitch thanked for this postLake X Kid liked this post
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08-02-2022, 02:19 PM #695
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08-02-2022, 02:41 PM #6965000 RPM
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08-03-2022, 07:35 AM #6975000 RPM
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I had the pleasure of trying to break this engine, and got payed for it. Some of the things we did to it you can't imagine .
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08-03-2022, 07:20 PM #6985000 RPM
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RBT, transomstand liked this post
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08-06-2022, 08:13 AM #6995000 RPM
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08-06-2022, 09:13 AM #700The Historic Photo Master
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...i don't know bernie. customers are known for destroying just about anything......
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08-08-2022, 06:22 AM #7015000 RPM
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Bernie, you wrote the book on what I had to do to abuse this engine
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08-08-2022, 08:16 AM #7025000 RPM
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Dd24skater liked this post
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08-09-2022, 06:20 AM #7035000 RPM
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you should put the contents of the book on here. that way everyone will know what we had to do to test these engines for release to the public, that shouldn't take you to long.
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Dave Strong liked this post
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08-09-2022, 08:27 AM #7045000 RPM
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joyrider liked this post
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08-19-2022, 02:19 AM #705Member
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This is directed at rckid74:
I see some of your early Internal Correspondence related to the V6, is dated early 1970. I think ECK left Mercury in 1969. Was the idea of a new engine design held back until after ECK left? I assume he was very proud of his Inline Engines, except maybe the I6 1500 which didn't come out until 73.