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<blockquote data-quote="oexing" data-source="post: 128168" data-attributes="member: 1493"><p>Some clarification about Me 109 if you don´t mind: Only for the first test aircraft a Rolls-Royce Kestrel 700 hp V 12 was utilized as no DB 600 engine was ready for installation in 1935. The second aircraft had the Junkers Jumo 210 , inverted fuel injected V 12 like the DB 600 series as the 109 was designed for inverted V 12 engines from the beginning. </p><p> The upright Merlin engine ruined the perfect lines of the Me 109 post war but for the Spanish version Buchon no more DB engines or Jumos were available in the fifties so no other choices at that time. Have a look at the two videoclips below for comparison Buchon - Me 109 , that is Merlin vs. DB 605 , sounds very different . </p><p> One trouble spot on the Merlin today may come at no surprise to Vincenteers, wear on cams and followers: Judging from the photos the Merlin "fingers" were drilled to supply oil to the cams but as was learned from the past this idea is not as great as hoped and no hardchroming would help much when the drilling arrives at a spot of highest load: Any "lubrication" hole there wrecks the oil film wedge that may have built . Either you provide oil jets onto cams or have the camshaft drilled all along and have holes on cams right before lift begins. </p><p> In consequence I welded up all holes in the cam followers and have all oil go into the camshafts with extra flow in there. Hoping for some oil coming down along the pushrods and finding its way into these holes in a flying follower is wishful thinking. </p><p> The DB 600 series like the Jumos and Allisons all had roller followers for this reason so at least no headache here, don´t know about other weaknesses in these engines.</p><p> </p><p> Vic</p><p></p><p>Merlin Buchon 109 clip</p><p><a href="https://www.youtube.com/watch?v=NajMpRohcmg" target="_blank">Buchon video</a></p><p></p><p>Me 109 DB 605 video:</p><p><a href="https://www.youtube.com/watch?v=b6Een3A2ptM" target="_blank">Me 109 DB 605 video</a></p><p></p><p>Merlin fingers:</p><p>[ATTACH=full]37675[/ATTACH]</p><p></p><p>[ATTACH=full]37676[/ATTACH]</p><p></p><p>DB 605 roller followers:</p><p>[ATTACH=full]37677[/ATTACH]</p><p></p><p>[ATTACH=full]37678[/ATTACH]</p><p></p><p>Welded follower:</p><p>[ATTACH=full]37679[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 128168, member: 1493"] Some clarification about Me 109 if you don´t mind: Only for the first test aircraft a Rolls-Royce Kestrel 700 hp V 12 was utilized as no DB 600 engine was ready for installation in 1935. The second aircraft had the Junkers Jumo 210 , inverted fuel injected V 12 like the DB 600 series as the 109 was designed for inverted V 12 engines from the beginning. The upright Merlin engine ruined the perfect lines of the Me 109 post war but for the Spanish version Buchon no more DB engines or Jumos were available in the fifties so no other choices at that time. Have a look at the two videoclips below for comparison Buchon - Me 109 , that is Merlin vs. DB 605 , sounds very different . One trouble spot on the Merlin today may come at no surprise to Vincenteers, wear on cams and followers: Judging from the photos the Merlin "fingers" were drilled to supply oil to the cams but as was learned from the past this idea is not as great as hoped and no hardchroming would help much when the drilling arrives at a spot of highest load: Any "lubrication" hole there wrecks the oil film wedge that may have built . Either you provide oil jets onto cams or have the camshaft drilled all along and have holes on cams right before lift begins. In consequence I welded up all holes in the cam followers and have all oil go into the camshafts with extra flow in there. Hoping for some oil coming down along the pushrods and finding its way into these holes in a flying follower is wishful thinking. The DB 600 series like the Jumos and Allisons all had roller followers for this reason so at least no headache here, don´t know about other weaknesses in these engines. Vic Merlin Buchon 109 clip [URL='https://www.youtube.com/watch?v=NajMpRohcmg']Buchon video[/URL] Me 109 DB 605 video: [URL='https://www.youtube.com/watch?v=b6Een3A2ptM']Me 109 DB 605 video[/URL] Merlin fingers: [ATTACH type="full"]37675[/ATTACH] [ATTACH type="full"]37676[/ATTACH] DB 605 roller followers: [ATTACH type="full"]37677[/ATTACH] [ATTACH type="full"]37678[/ATTACH] Welded follower: [ATTACH type="full"]37679[/ATTACH] [/QUOTE]
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