kentuckydiesel Posted January 16, 2007 Share Posted January 16, 2007 As I understand it, some R models have an extended hood. (RL700L as an example maybe?)Other than the better looks, why did they do this? Something added under the hood? Intercooler?Thanks, Phillip Quote Link to comment https://www.bigmacktrucks.com/topic/2027-reason-for-extended-hood-on-some-r-models/ Share on other sites More sharing options...
rick harper Posted January 16, 2007 Share Posted January 16, 2007 To accomodate the V8 Mack and vendor engines. Quote Link to comment https://www.bigmacktrucks.com/topic/2027-reason-for-extended-hood-on-some-r-models/#findComment-9765 Share on other sites More sharing options...
bulldog man Posted January 16, 2007 Share Posted January 16, 2007 To accomodate the V8 Mack and vendor engines.Yup just what rick said so the V8 Mack Cat, Cummins & Screamin jimmy Detroit could be in the Oh & to BMT Ky diesel later Bulldog or aka Quote You Cant Fix Stupid. But You Can Numb It With A Sledgehammer. Link to comment https://www.bigmacktrucks.com/topic/2027-reason-for-extended-hood-on-some-r-models/#findComment-9771 Share on other sites More sharing options...
fullfuel01 Posted January 16, 2007 Share Posted January 16, 2007 a Cat must be half bigger then a Mack to try to produce half of it's power. so they put a bigger dog house.. Quote Link to comment https://www.bigmacktrucks.com/topic/2027-reason-for-extended-hood-on-some-r-models/#findComment-9773 Share on other sites More sharing options...
mudslut28 Posted January 17, 2007 Share Posted January 17, 2007 Yeah the Cats and Cummins are much larger. I know the older Cummins were 855 ci. I believe the Cat is over 900ci.I am thinking the 2 valve and e6 Mack motors were in the 670-680 (673??) ci range and the E7's are around 725-735 ci...cant remember the exact numbers. I could be wrong on these numbers but I am close...lol. Quote Link to comment https://www.bigmacktrucks.com/topic/2027-reason-for-extended-hood-on-some-r-models/#findComment-9782 Share on other sites More sharing options...
rick harper Posted January 17, 2007 Share Posted January 17, 2007 The E6 was 673ci and the E7 was 728ci. The V8 and vendor engines also needed bigger radiators to allow proper cooling. Quote Link to comment https://www.bigmacktrucks.com/topic/2027-reason-for-extended-hood-on-some-r-models/#findComment-9783 Share on other sites More sharing options...
Rob Posted January 17, 2007 Share Posted January 17, 2007 Yeah the Cats and Cummins are much larger. I know the older Cummins were 855 ci. I believe the Cat is over 900ci.I am thinking the 2 valve and e6 Mack motors were in the 670-680 (673??) ci range and the E7's are around 725-735 ci...cant remember the exact numbers. I could be wrong on these numbers but I am close...lol.1693TA Caterpillar in my RL755L displaces 893 cubic inches, 14.6 Ltr. 425 hp@ 2100rpm, 1275 pound ft. torque@1400 rpm. These figures are conservative I'm told by Caterpillar engineers.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/2027-reason-for-extended-hood-on-some-r-models/#findComment-9786 Share on other sites More sharing options...
Lmackattack Posted January 17, 2007 Share Posted January 17, 2007 MY Long hood (RS700L) has the 6 cyl 285 Mack tip turbine . It has about 12"-14" between the fire wall and rear engine. Some day I would like to drop a E9 in it but for now it pulls great and cost next to nothing to keep it running. Someone correct me but are the 700 hoods 12" longer than R models??/ always wondered how much longer they were? Quote Link to comment https://www.bigmacktrucks.com/topic/2027-reason-for-extended-hood-on-some-r-models/#findComment-9787 Share on other sites More sharing options...
kentuckydiesel Posted January 17, 2007 Author Share Posted January 17, 2007 So brand loyalties aside, which was the more powerful engine? Mack V8? Cat?-Phillip Quote Link to comment https://www.bigmacktrucks.com/topic/2027-reason-for-extended-hood-on-some-r-models/#findComment-9788 Share on other sites More sharing options...
Rob Posted January 17, 2007 Share Posted January 17, 2007 MY Long hood (RS700L) has the 6 cyl 285 Mack tip turbine . It has about 12"-14" between the fire wall and rear engine. Some day I would like to drop a E9 in it but for now it pulls great and cost next to nothing to keep it running. Someone correct me but are the 700 hoods 12" longer than R models??/ always wondered how much longer they were?My engine fills the bay front to back. There is no doghouse protruding into the cab but it is a tight fit to get a hand behind the engine against the firewall.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/2027-reason-for-extended-hood-on-some-r-models/#findComment-9789 Share on other sites More sharing options...
GearheadGrrrl Posted January 17, 2007 Share Posted January 17, 2007 To give an idea of the length of the engines, Mack was able to fit their six completely under the 54" BBC MH cab. A 14 liter Cummins requires a 63" BBC cab to cover, and the big Cat is if anything slightly longer. Quote Link to comment https://www.bigmacktrucks.com/topic/2027-reason-for-extended-hood-on-some-r-models/#findComment-9796 Share on other sites More sharing options...
fullfuel01 Posted January 17, 2007 Share Posted January 17, 2007 V8 Mack of course dude Quote Link to comment https://www.bigmacktrucks.com/topic/2027-reason-for-extended-hood-on-some-r-models/#findComment-9808 Share on other sites More sharing options...
bulldoggin' Posted January 20, 2007 Share Posted January 20, 2007 Bigger hoods for bigger motors for bigger DOGS! Quote KEEP THE BLACK SMOKE ROLLIN Link to comment https://www.bigmacktrucks.com/topic/2027-reason-for-extended-hood-on-some-r-models/#findComment-9873 Share on other sites More sharing options...
rick harper Posted January 20, 2007 Share Posted January 20, 2007 A good treaked V8Mack will kick a cat ass back to shinola. Quote Link to comment https://www.bigmacktrucks.com/topic/2027-reason-for-extended-hood-on-some-r-models/#findComment-9879 Share on other sites More sharing options...
mudslut28 Posted January 20, 2007 Share Posted January 20, 2007 The V8 Mack.....the 500's are amazing when loaded heavily. Besides that you gonna have to mortgage the truck AND the house to fix that V8 Cat if it breaks....lol. Quote Link to comment https://www.bigmacktrucks.com/topic/2027-reason-for-extended-hood-on-some-r-models/#findComment-9880 Share on other sites More sharing options...
Phase 1 Posted February 4, 2007 Share Posted February 4, 2007 The RL (and FL COE) was built in Mack's Hayward California factory. It was an effort by Mack to combat the growing popularity of the west coast makes with the long hoods and set forward front axles. The forward set axle and long hood made it a "West Coast" truck and allowed bigger motors to be used. The RL 700's predecessors would have been the LT and B70 (especially those with the L cab) series. The next model in that position was the Superliner. Quote Link to comment https://www.bigmacktrucks.com/topic/2027-reason-for-extended-hood-on-some-r-models/#findComment-10254 Share on other sites More sharing options...
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