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Farm Machinery
Classic Machinery
Nuffield D4 with Six Cylinder Engine
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<blockquote data-quote="John 1594" data-source="post: 489619" data-attributes="member: 23"><p>perkins p6 in the major had 2 different specs...the agri engine, which had cast iron pistons, revved to 2000rpm and developed 45hp. The industrial spec engine had ally pistons and revved to nearer 3000rpm</p><p></p><p>shortly into the life of the P6, it was found that allowing the cast iron pistoned engine to over-rev was causing bent con rods, and damaged bearings, so they standardised on ally pistons on all the variants</p><p></p><p>personally i think the L4 engined conversion was better, it wasnt as nose heavy and the L4 was a keener starter in cold weather</p><p></p><p>As for the MP6, it was purely a towing tractor, designed mainly for roadwork and driving a drum, it was marshalls last throw of the dice after they pursued with thier outdated (but very efficient) single cylider range</p><p></p><p>The MP6 was very similar in design terms to the David Brown 50D, a large, towing only machine built for roadwork and beltwork, with oddles of power, they really wasnt suited to fieldwork in practical terms</p><p></p><p>Shame that neither really did well in terms of actual sales</p></blockquote><p></p>
[QUOTE="John 1594, post: 489619, member: 23"] perkins p6 in the major had 2 different specs...the agri engine, which had cast iron pistons, revved to 2000rpm and developed 45hp. The industrial spec engine had ally pistons and revved to nearer 3000rpm shortly into the life of the P6, it was found that allowing the cast iron pistoned engine to over-rev was causing bent con rods, and damaged bearings, so they standardised on ally pistons on all the variants personally i think the L4 engined conversion was better, it wasnt as nose heavy and the L4 was a keener starter in cold weather As for the MP6, it was purely a towing tractor, designed mainly for roadwork and driving a drum, it was marshalls last throw of the dice after they pursued with thier outdated (but very efficient) single cylider range The MP6 was very similar in design terms to the David Brown 50D, a large, towing only machine built for roadwork and beltwork, with oddles of power, they really wasnt suited to fieldwork in practical terms Shame that neither really did well in terms of actual sales [/QUOTE]
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Classic Machinery
Nuffield D4 with Six Cylinder Engine
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