Air Cleaner question

[roadranger]

On the R-600 Model trucks what was the reason for the second air filter hose?  Did that signify a certain engine model, like the Maxidyne?

Whereas other trucks had a single hose. These are both 1980's era trucks.

 

Thanks for any info

 

 

 

 

 

 

 

 

 

 

[Dalton1]

The second tube went to the tip turbine on certain engines, the 300+ used them and I believe a few others as well.

It's a sort of blower that is powered by a bleed of compressed air from the turbo to blow cool air over an engine mounted intercooler.

[67RModel]

Also, the original Maxidyne trucks from say 1966-1972 have two as well. However, the lower one is open ended under the hood. I assume so the intake air stream is partially warm. These trucks didn't have charge air coolers so I don't know why they did that but they did......

[Brocky]

1 hour ago, 67RModel said:

Also, the original Maxidyne trucks from say 1966-1972 have two as well. However, the lower one is open ended under the hood. I assume so the intake air stream is partially warm. These trucks didn't have charge air coolers so I don't know why they did that but they did......

Inclement weather!!!!  By drawing air from under the hood prevented rainwater from building up in the filter.. A lot of Northeast snowplows used this system to prevent the filter from clogging with snow and ice..

[mrsmackpaul]

4 hours ago, 67RModel said:

Also, the original Maxidyne trucks from say 1966-1972 have two as well. However, the lower one is open ended under the hood. I assume so the intake air stream is partially warm. These trucks didn't have charge air coolers so I don't know why they did that but they did......

The original Maxidyne's only had the 1 intake tube in Australia 

It wasnt until the coolpower motor came along that two intake tubes were needed, however in Australia the second intakecame from a second aircleaner for the turbine and the other aircleaner was for the motor intake

 

Paul

 

 

[Mark T]

Weren't the Maxidyes (237s) with the two side by side and smaller compared to the engines with a tip fan that were one on top of the other and bigger diameter ? I think some with a Strata Tube had the air cleaner that was smaller on the top if it had the under hood draw for bad weather too.

[1961H67]

I have a 1968 R Firetruck that has a control on the dash that switch’s where the intake draws from,, like Y’all are talking about, pretty neat setup. 

[mechohaulic]

54 minutes ago, 1961H67 said:

I have a 1968 R Firetruck that has a control on the dash that switch’s where the intake draws from,, like Y’all are talking about, pretty neat setup. 

I was racking my brain cells trying to picture the two hose air cleaners and for sure there was a cable going to lower intake hose as you say for inclement weather intake. can't remember two separate filters in canister ;;small and large? 

[Dalton1]

I forgot about that, most of the snow fighter trucks had an air switch on the dash to flip a shutter in the air cleaner to pull air from under the hood though a 2nd tube in sub zero weather, my '81 RD had this option and even my '07 Granite still does. Pretty sure those setups only used one filter though not 2 like the tip turbine. 

[1961H67]

Yep same filter, the flap just reroutes the suction from top bonnet to the hose under the hood ,, Good engineering from back in the day! 

[1961H67]

My 68 R Firetruck , Bought new by the City of Baltimore 

[Freightrain]

Notice the cold air version, the tubes are side by side.  Most of the tip turbine air cleaners the tubes are up/down.

[mechohaulic]

so many yrs later and still learning. never paid attention to side by side vs up/down on air cleaner piping, do remember the cable control now that you posted a picture. so many changes with "progress"; still remember the   dry road/slippery road valve on dash;; it cut the full air pressure to steer axle brakes .

[Freightrain]

With my little aingle axle, when I have flipped the wet road valve it really kills the braking power overall.  I've tried it on occasion on an empty road.

[doubleclutchinweasel]

My '70 had 2 hoses, side-by-side.  No selector for the air.  I think the selection on that one was automatic, based on the temperature, by a bi-metal coil....IF I remember correctly.