dek1581 Posted July 18 Share Posted July 18 I'm checking out a 1982 Mack CF fire engine for sale. Trying to confirm the engine that it has in it. It has CF686F12 stamped on it. I have seen models with 612 which meant it had the 300+. This is not the same obviously. FYI: the engine has light blue paint and the charge air cooler has water lines coming in/out of the side. Quote Link to comment https://www.bigmacktrucks.com/topic/74352-mack-chassis-plate-decode/ Share on other sites More sharing options...
1958 F.W.D. Posted July 18 Share Posted July 18 21 hours ago, dek1581 said: I'm checking out a 1982 Mack CF fire engine for sale. Trying to confirm the engine that it has in it. It has CF686F12 stamped on it. I have seen models with 612 which meant it had the 300+. This is not the same obviously. FYI: the engine has light blue paint and the charge air cooler has water lines coming in/out of the side. CF612 ETAZ673A-315/320HP Thermodyne 300 Plus CF686 ENDT676-285 HP EM6285 Maxidyne 300 EM6300 Quote TWO STROKES ARE FOR GARDEN TOOLS Link to comment https://www.bigmacktrucks.com/topic/74352-mack-chassis-plate-decode/#findComment-555495 Share on other sites More sharing options...
Lmackattack Posted July 20 Share Posted July 20 A CF686 denotes a 285 maxidyne. my truck is a RS786 with the same engine. A 300+ would be a CF612 Also a 285 hp usually had a 5 or 6 speed transmission as it was a high torque rise. where the 300+ needed minimum of 8 gears due to its shorter powerband Quote Link to comment https://www.bigmacktrucks.com/topic/74352-mack-chassis-plate-decode/#findComment-555603 Share on other sites More sharing options...
dek1581 Posted August 2 Author Share Posted August 2 Thanks for the replies. Now, did Mack produce a 300 HP version of the 2-Valve Maxidyne or was the HP increased when the Maxidyne was changed to 4-Valves? Quote Link to comment https://www.bigmacktrucks.com/topic/74352-mack-chassis-plate-decode/#findComment-556326 Share on other sites More sharing options...
Lmackattack Posted August 4 Share Posted August 4 Yes very early 80s had 2 valve 300 hp The 4v came out around 1983-84 if I recall 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74352-mack-chassis-plate-decode/#findComment-556404 Share on other sites More sharing options...
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