replicaengineer Posted June 26, 2013 Share Posted June 26, 2013 Would an 1987 R688ST come with both short and tall breather? Engine is a Mack 300. And what would determine the breather stack height? Also what about round vs. rectanguar tanks? What dictates the usage? Model, year, engine, use (tractor, van body, dump bed)? Quote Link to comment Share on other sites More sharing options...
2stacksuperdog Posted June 26, 2013 Share Posted June 26, 2013 Rounds tanks were used after '77. DMs/Us had square till the end. and what do you mean by breather height? Quote Matt Link to comment Share on other sites More sharing options...
Lmackattack Posted June 26, 2013 Share Posted June 26, 2013 Square tanks were standard untill the late 70's with round as an option . Then around 76'-78' round tanks was standard not sure when square were discontinued?...From what i have seen Air cleaners of all years could be speced for standard short breather or option for a offroad tall breather. There was also an option for twin inlet / under hood air intake. Quote Link to comment Share on other sites More sharing options...
Offset-U-bet! Posted June 26, 2013 Share Posted June 26, 2013 The tall vs short air breather. The tall breather stack was used up till the mid 70's (if I can remember right) I believe your 87 should have a short breather stack in fact I'm almost possitive. The dual intake tubes that where mentioned where on the 300 PLUS engines. 300's had single intake tubes. The only options as far as the fuel tanks is aluminum or painted steel in round only post 78. Quote Link to comment Share on other sites More sharing options...
RFCDrum Posted June 27, 2013 Share Posted June 27, 2013 I have dual intake tubes on my R it has the ENDT676 @ 283 hp. I like the big dual element air cleaners. Cheers, Rob 1 Quote Link to comment Share on other sites More sharing options...
Lmackattack Posted June 27, 2013 Share Posted June 27, 2013 I should be more specific....I was not talking about the tip turbine engines...There were also twin pipe air cleaners used to draw under hood air into the filter housing, air entered a pipe under the hood...then that air was filtered in the housing and then sucked thru the turbo and into the engine. Canadian mack trucks often had these..A lot of dm Mack's that see a lot of dusty job sites often had the tall air cleaner with the inlet near the roof line.. Quote Link to comment Share on other sites More sharing options...
Offset-U-bet! Posted June 27, 2013 Share Posted June 27, 2013 I have dual intake tubes on my R it has the ENDT676 @ 283 hp. I like the big dual element air cleaners. Cheers, RobHummmm! Interesting. Where does the other tube go to? Is your motor like the 300 PLUS as in set up etc? Quote Link to comment Share on other sites More sharing options...
Lmackattack Posted June 27, 2013 Share Posted June 27, 2013 Hummmm! Interesting. Where does the other tube go to? Is your motor like the 300 PLUS as in set up etc?The 285 and 300+ used a tip turbine so the 2nd tube feeds clean air to the turbine. Quote Link to comment Share on other sites More sharing options...
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