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Shop built roller starter
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<blockquote data-quote="Magnetoman" data-source="post: 112440" data-attributes="member: 2806"><p>I can't specifically answer the question you asked but I can provide some information that's directly relevant.</p><p></p><p>My DocZ rollers came with a single motor and had no trouble starting a Gold Star with 10:1 compression. But, since it had a slot for a second motor, I couldn't stop myself from adding it. With the two motors it still manages to start that Gold Star... The following measurement applies to the two-motor configuration:</p><p></p><p>The pair of motors draw a combined 480 A total so assuming a nominal 12 V for the battery[*], that's 5.76 kW. Obviously, with one motor it would be half that, i.e. 2.9 kW. This says that twice the h.p. of the motor you asked about will start an engine half the size (but greater compression) than your Vincent. From there you'll have to speculate. </p><p></p><p>[*]You plan to use mains but for those who use a battery, since the current drops linearly with voltage the power supplied to the rollers will be reduced to 85% after 15 sec; to 70% after 30 sec.; and 55% after 45 sec. This is relevant if someone plans to use rollers to spin an engine long enough to be sure oil is flowing.</p></blockquote><p></p>
[QUOTE="Magnetoman, post: 112440, member: 2806"] I can't specifically answer the question you asked but I can provide some information that's directly relevant. My DocZ rollers came with a single motor and had no trouble starting a Gold Star with 10:1 compression. But, since it had a slot for a second motor, I couldn't stop myself from adding it. With the two motors it still manages to start that Gold Star... The following measurement applies to the two-motor configuration: The pair of motors draw a combined 480 A total so assuming a nominal 12 V for the battery[*], that's 5.76 kW. Obviously, with one motor it would be half that, i.e. 2.9 kW. This says that twice the h.p. of the motor you asked about will start an engine half the size (but greater compression) than your Vincent. From there you'll have to speculate. [*]You plan to use mains but for those who use a battery, since the current drops linearly with voltage the power supplied to the rollers will be reduced to 85% after 15 sec; to 70% after 30 sec.; and 55% after 45 sec. This is relevant if someone plans to use rollers to spin an engine long enough to be sure oil is flowing. [/QUOTE]
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