Bigdogtrucker Posted July 2, 2012 Share Posted July 2, 2012 Anybody know much about them?Opetating range,oil pressure,overall thoughts??? Quote Link to comment https://www.bigmacktrucks.com/topic/25986-cummins-pt270-questions/ Share on other sites More sharing options...
Green Dash Posted July 2, 2012 Share Posted July 2, 2012 I know they had much higher torque than other engines of similar hp in it's day, except the Maxidyne. I've seen numbers somewhere in the 900-1000 lb range which is right there with an NTC-350 of the same era. If you're familiar with Brockway's Huskidrive, that's the engine they used to compete with the Maxidyne. They put in in front of a 5 speed with a 2 speeed (5.05/3.70) rear axle and instructed you to use low speed on the rear and flip a switch for high speed when in 5th. That says something of it's capabilities. I've seen them quite a bit in vocational trucks in front of Fuller 8ll's and 7 speed Spicers.When my Dad used to haul bananas, another company from the bronx had a PT-270 and a 13 spd Roadranger in a Diamond Reo. He would have no problem keeping up with us in a K100 with an NTC-350. We had similar loads, both grossing in the low 70's on the NY Thruway between Albany and NYC. This is my only perspective having never driven a truck with one myself.I had always thought that PT was an abbreviation for Power Torque, but have seen that argued on other forums. Quote Jim Link to comment https://www.bigmacktrucks.com/topic/25986-cummins-pt270-questions/#findComment-126575 Share on other sites More sharing options...
GearheadGrrrl Posted July 3, 2012 Share Posted July 3, 2012 'Twas Cummins attempt at building a Maxidyne, but didn't work quite as well. UPS had thousands of them in GMC Astros, they kinda worked but made you wish for a genuine Maxidyne. Quote Link to comment https://www.bigmacktrucks.com/topic/25986-cummins-pt270-questions/#findComment-126744 Share on other sites More sharing options...
Green Dash Posted July 3, 2012 Share Posted July 3, 2012 'Twas Cummins attempt at building a Maxidyne, but didn't work quite as well. UPS had thousands of them in GMC Astros, they kinda worked but made you wish for a genuine Maxidyne.I'm guessing that wasn't Cummins' intention when they marketed it.What tranny did the Astro's have. I read an article in one of the trucking rags, possibly Fleet Owner, where they did a report on a then new UPS Astro. It was similar to an Overdrive dissection report, but the focus was on the modifactions that were done to factory trucks to bring them up to UPS standards. All I remember was the emphasis on noise control and that the engine had been derated to 255 hp. I'm pretty sure it was a Cummins. Quote Jim Link to comment https://www.bigmacktrucks.com/topic/25986-cummins-pt270-questions/#findComment-126756 Share on other sites More sharing options...
Superdog Posted July 3, 2012 Share Posted July 3, 2012 I've got a PT270 in my '69 RL739LST,it has a 6 speed Spicer.I too was told by a Cummins man that they were built to compete with the Maxidyne. Quote Link to comment https://www.bigmacktrucks.com/topic/25986-cummins-pt270-questions/#findComment-126768 Share on other sites More sharing options...
Bigdogtrucker Posted July 4, 2012 Author Share Posted July 4, 2012 Anybody know what type of oil press. these Cummins should have at idle,and at rpm? Quote Link to comment https://www.bigmacktrucks.com/topic/25986-cummins-pt270-questions/#findComment-126777 Share on other sites More sharing options...
Olivetroad Posted July 4, 2012 Share Posted July 4, 2012 I've got a PT270 in my '69 RL739LST,it has a 6 speed Spicer.I too was told by a Cummins man that they were built to compete with the Maxidyne.Do you have a photo of it? I have never seen one, how do they differ from a 290 as far as looks? Quote Link to comment https://www.bigmacktrucks.com/topic/25986-cummins-pt270-questions/#findComment-126780 Share on other sites More sharing options...
Rob Posted July 4, 2012 Share Posted July 4, 2012 Is this the same engine referred to as a "Fleet 270"? If so I know where a very good running one in a wrecked truck resides with a Fuller behind it. Non turbo engine but 855 cubic inches. 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/25986-cummins-pt270-questions/#findComment-126783 Share on other sites More sharing options...
GreenGiant2 Posted July 4, 2012 Share Posted July 4, 2012 i think they were 927 cid. oil pressure shouldnt be any different that any other cummins.gg2 Quote We the unwilling, Lead by the unqualified, are doing the impossible, for the ungrateful. Link to comment https://www.bigmacktrucks.com/topic/25986-cummins-pt270-questions/#findComment-126895 Share on other sites More sharing options...
Green Dash Posted July 4, 2012 Share Posted July 4, 2012 i think they were 927 cid. oil pressure shouldnt be any different that any other cummins.gg2Of course I can't find anything on Google, but I believe the PT270 used the standard 855 block and the tweaks in the torque curve came from the fuel pump. The Super 250 used the 927 in block, not sure where else it was used.Is this the same engine referred to as a "Fleet 270"? If so I know where a very good running one in a wrecked truck resides with a Fuller behind it. Non turbo engine but 855 cubic inches.RobFleet 270 came out some time later, when high torque rise engines were more common. Maybe the same motor with a new name? Quote Jim Link to comment https://www.bigmacktrucks.com/topic/25986-cummins-pt270-questions/#findComment-126897 Share on other sites More sharing options...
GearheadGrrrl Posted July 4, 2012 Share Posted July 4, 2012 PT270 was an 855, basicly an Formula 300 with a flattened torque curve and 2100 RPM governor setting. Fleet engines were like a Formula, except governed to 1600 RPM IIRC. Quote Link to comment https://www.bigmacktrucks.com/topic/25986-cummins-pt270-questions/#findComment-126898 Share on other sites More sharing options...
Green Dash Posted July 4, 2012 Share Posted July 4, 2012 PT270 was an 855, basicly an Formula 300 with a flattened torque curve and 2100 RPM governor setting. Fleet engines were like a Formula, except governed to 1600 RPM IIRC.Didn't the PT270 come out before the Formula's, or were you just using the 300 as a comparison? The Diamond Reo I mentioned above was a '71 but I hadn't heard of the Formula engines until the mid-70's. Quote Jim Link to comment https://www.bigmacktrucks.com/topic/25986-cummins-pt270-questions/#findComment-126899 Share on other sites More sharing options...
Rob Posted July 4, 2012 Share Posted July 4, 2012 I've never been around Cummins engine but remember the advertisements in magazines about the "Formula" engines in 1981 and on. I remember JB Hunt had a lot of "Formula 230" engines.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/25986-cummins-pt270-questions/#findComment-126905 Share on other sites More sharing options...
GearheadGrrrl Posted July 5, 2012 Share Posted July 5, 2012 Formula engines came out in the mid 70s. The engine in the '71 was probably an NHCT-CT, a 248 HP high torque rise version of the NHCT 270. Quote Link to comment https://www.bigmacktrucks.com/topic/25986-cummins-pt270-questions/#findComment-127035 Share on other sites More sharing options...
Green Dash Posted July 5, 2012 Share Posted July 5, 2012 Formula engines came out in the mid 70s. The engine in the '71 was probably an NHCT-CT, a 248 HP high torque rise version of the NHCT 270.The door tag said PT-270, but I could be mistaken on the year. Quote Jim Link to comment https://www.bigmacktrucks.com/topic/25986-cummins-pt270-questions/#findComment-127043 Share on other sites More sharing options...
b61mack Posted July 7, 2012 Share Posted July 7, 2012 Formula engines came out in the mid 70s. The engine in the '71 was probably an NHCT-CT, a 248 HP high torque rise version of the NHCT 270. I have a 1970 Transtar 4070 that has an NHCT-CT 270, it has a 9 speed roadranger. they came in 3 horsepower ratings (240, 255, 270. Ron Quote Link to comment https://www.bigmacktrucks.com/topic/25986-cummins-pt270-questions/#findComment-127467 Share on other sites More sharing options...
GearheadGrrrl Posted July 8, 2012 Share Posted July 8, 2012 That's probably just a plain NHCT. The NHCT-CT (Custom Torque) had peak power around 1700 versus 2100 for the plain NHCT and peak torque down around 1200 or 1300 RPM. Same engine, different tuning. The NHCT-CT came out around 1966 in response to the Maxidyne and was replaced by the "Formula" derived PT (Power Torque) engines in the mid 1970s. Quote Link to comment https://www.bigmacktrucks.com/topic/25986-cummins-pt270-questions/#findComment-127671 Share on other sites More sharing options...
theakerstwo Posted July 22, 2012 Share Posted July 22, 2012 PT270 was an 855, basicly an Formula 300 with a flattened torque curve and 2100 RPM governor setting. Fleet engines were like a Formula, except governed to 1600 RPM IIRC. This is right Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/25986-cummins-pt270-questions/#findComment-129866 Share on other sites More sharing options...
theakerstwo Posted July 22, 2012 Share Posted July 22, 2012 That's probably just a plain NHCT. The NHCT-CT (Custom Torque) had peak power around 1700 versus 2100 for the plain NHCT and peak torque down around 1200 or 1300 RPM. Same engine, different tuning. The NHCT-CT came out around 1966 in response to the Maxidyne and was replaced by the "Formula" derived PT (Power Torque) engines in the mid 1970s. right Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/25986-cummins-pt270-questions/#findComment-129868 Share on other sites More sharing options...
storkmack Posted January 14, 2021 Share Posted January 14, 2021 Reading this after chasing a Goggle search 2021! Quote Link to comment https://www.bigmacktrucks.com/topic/25986-cummins-pt270-questions/#findComment-466953 Share on other sites More sharing options...
Bullheaded Posted January 15, 2021 Share Posted January 15, 2021 Been so long I can't remember oil pressures or anything like that, but ran a PT270 in a 1978 International S-Line tandem dump truck for many years. I do remember it pulled good for what it was. All the other dump trucks I worked with at that time had small International or Cat 3208 engines and that 270 was a powerhouse compared to them. But it was heavy. Get that truck into soft sand with it's wide base steers and the rear end was hopping where the other little motors would keep going. Other thing I remember about it, was a lot of people had a really hard time driving it, but I was used to it. The throttle would really "float" in it. You let off to shift and the RPM would float before it came down. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/25986-cummins-pt270-questions/#findComment-466999 Share on other sites More sharing options...
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