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 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 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 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 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 Share on other sites More sharing options...
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