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ScottS

diesel engine question

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Marion_Kerr
Most diesel engines torque curves are in the range of 1300 to 2100 rpm. Usually the power torque curve starts back down above 1750 rpm. The best operating range is 1300 thru 1700 rpm usually.

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UCD
I believe it is 3600 rpm Lombardine rates some of it engines hp at 3000 some at 3600. the only engine specs in the Simplicity 7790 owneres manual and lombardini engine manual are engine model 10LD400-2 bore 86mm stroke 68mm displacement 790 cubic cm All of the attachments and pulleys are the same as the gas 7100 series and they operate at 3600 rpm. Specs for the 10LD400-2 are no longer on the Lombardini site. I have all the books and paper work from Simplicity and Lombardine includeing the lombardine tool kit that came with the tractor. Anything free is worth what you pay for it This & $1.00 might get you a small Coffee Maynard aka/UCD

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MikeES
My friend, when he was pulling his 7790, carried a complete specification book on the Lambardini diesel to show that he was running it at factory specified rpms. Which was 3750 rpms! The tractor was entered in the Modified Stock class a couple of times, and we spooled the engine up to 4200. The national rules were changed in 2001 (any engine over 14hp) to 3500 rpms or factory specifications which ever is lower. We were told that this rule was added to "equalize" the high speed diesels as no gas engine could touch them. The 3500 rpm did make it a closer contest but the diesel was still the points champion. Good Luck! Mike S.

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PatRarick
Scott, I would assume that the speed must be close to 3600 rpm, since the tractor is geared the same as a gas tractor. It would have to maintain that rpm to adequately handle the implements, since they are the same between gasoline and diesel models. Marion, your information corresponds to what I was always taught, but the newer small diesels must be different. The specs for the Briggs 3-cylinder liquid cooled diesel show that they are rated at 3600 rpm, with the torque drop off beginning at 2400 rpm. Pat

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