looking at engine data for Superdawg... considering various Diesels... probably a Mercedes a 2.5L TD or 3.0L TD... a 6.5L TD would be the best for all around power... a 4.7L V8 out of a WJ would be the quietest and fastest... would get around 16 in town and 20 -21 on the freeway. sadly the 6.5 or 6.2 would do about the same... with the Mercedes Diesels I'm thinking I'd see closer to 20 in town and closer to 30 on the freeway... Superdawg is an '83 J10 stepside with a curb weight around 4,100lbs. underconsideration: -94 - GM 6.5L TD - 215 hp @ 3,200 - 440 lb-ft @ 1,800 -87 300d 3.0L chassis 124.133 /engine 603.960 143 hp @ 4600 rpm, 195 ftlbs @ 2400 rpm -91 300d 2.5 Turbo Diesel chassis 124.128 /engine 602.962 121 hp @ 4600 rpm, 165 ftlbs @ 2400 rpm -88 - GM 6.2L Dsl- 130 hp @ 3,600 - 240 ft lbs @ 2,000 -99 - WJ 4.7L - 235 hp @ 4,800 - 295 ft lbs @ 3,200 <-- WJ (GAS... :( to get better economy I'm thinking the Mercedes Turbo Diesel would work better... john full details below: ================================================= Benz Model/Engine --601 series-- -84-85 190D 2.2 chassis 201.122 /engine 601.921 72hp @ 4200 rpm, 96 ftlbs @ 2800 rpm --602 series-- -86-89 190D 2.5 chassis 201.126 /engine 602.911 non-turbo 93hp @ 4100 rpm, 122 ftlbs @ 2800 rpm -87 190D 2.5 TD chassis 201.128 /engine 602.961 turbo 123 hp @ 4600 rpm, 168 ftlbs @ 2400 rpm -91 300d 2.5 Turbo Diesel chassis 124.128 /engine 602.962 turbo 121 hp @ 4600 rpm, 165 ftlbs @ 2400 rpm --603 series-- -86-87 300SDL chassis 126.125 /engine 603.961 148 hp @ 4600 rpm, 201 ftlbs @ 2400 rpm -91 350SD chassis 126.134 /engine 603.970 <--- 3.5L TD - BEWARE 150 hp @ 4000 rpm, 229 ftlbs @ 2200 rpm -87 300d 3.0L chassis 124.133 /engine 603.960 143 hp @ 4600 rpm, 195 ftlbs @ 2400 rpm --606 series-- -95 E300d 3.0L chassis 124.131 /engine 606.910 ???? --616 series-- -77-83 240d chassis 123.123 /engine 616.912 72 hp @ 4,400 - 97 ft lbs @ 2,400 (normally aspirated) --617 series-- -77-81 300d 3.0L chassis 123.130 /engine 617.912 88 hp @ 4,400 - 126.6 ft lbs @ 2,400 -81-85 300SD chassis 126.120 /engine 617.951 125 hp @ 4,350 - 170 ft lbs @ 2,400 -82-85 300d 3.0L TD chassis 123.133 /engine 617.952 125 hp @ 4,350 - 170 ft lbs @ 2,400 year - engine - HP @ rpm - torque @ rpm -------------------------------------- 83 - J10 4.2L - 115 hp @ 3,200 - 210 ft lbs @ 1,800 <-- original 97 - ZJ 4.0L - 185 hp @ 4,600 - 220 ft lbs @ 2,400 99 - WJ 4.7L - 235 hp @ 4,800 - 295 ft lbs @ 3,200 <-- WJ 99 - WJ 4.0L - 195 hp @ 4,600 - 230 ft lbs @ 3,000 83 - J10 360V8 - 129 hp @ 3,700 - 245 ft lbs @ 1,600 <-- Old Blue 88 - XJ 4.0L - 177 hp @ 4,500 - 224 ft lbs @ 2,500 <-- little wagoneer 91 - XJ 4.0L - 190 hp @ 4,750 - 225 ft lbs @ 4,000 97 - ZJ 5.2L - 220 hp @ 4,400 - 300 ft lbs @ 3,200 78 - SJ 401V8 - 215 hp @ 4,400 - 320 ft lbs @ 2,800 <-- 401 V8 88 - GM 6.2L Dsl- 130 hp @ 3,600 - 240 ft lbs @ 2,000 94 - GM 6.5L TD - 215 hp @ 3,200 - 440 lb-ft @ 1,800 GAS V8s 88 - GM 350V8-FI- 210 hp @ 4,000 - 300 ft lbs @ 2,800 89 - Ford 302-FI- 185 hp @ 3,400 - 270 ft lbs @ 2,400 Mercedes Diesels -------------------------------- 85 - 190D 2.2L - 72 hp @ 4,200 - 96 ft lbs @ 2,800 (normally aspirated) 83 - 240D 2.4L - 72 hp @ 4,400 - 97 ft lbs @ 2,400 (normally aspirated) 87 - 190D 2.5L - 123 hp @ 4,600 - 168 ft lbs @ 2,400 (TURBO) 81 - 300D 3.0L - 88 hp @ 4,400 - 126.6 ft lbs @ 2,400 (normally aspirated) <-- fritz 83 - 300SD 3.0L - 125 hp @ 4,350 - 170 ft lbs @ 2,400 (TURBO) ----- ------------------------------------------------------------------------- Snohomish, Washington -o|||||o- where Jeeps don't rust, they mold SAVE fuel: use synthetics: http://www.AMSOIL.com/redirect.cgi?zo=283461 SAVE power: use LINUX: http://johnmeister.com/tmcp.pdf http://wagoneers.com http://gunbanobama.com/ http://freegift.com -------------------------------------------------------------------------