Diesel P/U engine ??
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=173279
Printed Date: 08 Sep 2025 at 5:37am
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Topic: Diesel P/U engine ??
Posted By: FREEDGUY
Subject: Diesel P/U engine ??
Date Posted: 02 Aug 2020 at 5:49pm
| What is the "max" rpm's that a diesel engine in a p/u with an auto tranny will get to ? I had a guy pull out in front of me this afternoon and he really stomped on it to get ahead of me but it sure sounded like it was hitting 4 grand (my windows were down) ?? Maybe that's not out of the "norm", I've never been in or driven one. Thanks |
Replies:
Posted By: TramwayGuy
Date Posted: 02 Aug 2020 at 6:22pm
| At least 3000 for a 24valve Cummins. |
Posted By: jaybmiller
Date Posted: 02 Aug 2020 at 7:39pm
|
depends on who 'tunered' it....and of course overall design and parts... but a run-of-the-mill ... maybe tops out at 5000 RPM diesel burns slower than gas which is one limiting factor.... ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: DMiller
Date Posted: 02 Aug 2020 at 7:41pm
| 7.3l Fords will hit 3800 easily. 6.0 and 6.4 are shorter stroke engines can turn faster. These are not HD Diesels. |
Posted By: PaulB
Date Posted: 02 Aug 2020 at 7:50pm
Musta been one of those power JOKES. They sound like a constipated Sumo wrestler after eating cheese sandwiches for the last month. Then have some kid remove the muffler and add a tuner chip and it will look like the orange-blossom special rounding the mountain and still they won't get out of a VW bug's way  ------------- If it was fun to pull in LOW gear, I could have a John Deere. Real pullers don't have speed limits. If you can't make it GO... make it SHINY |
Posted By: Dakota Dave
Date Posted: 02 Aug 2020 at 7:51pm
| Duramax l5p redlines at 3450 rpm. I've seen guys at the track claim 4000 but they don't seem to last long usually break other drive line parts before anything happens to the engine |
Posted By: ac fleet
Date Posted: 02 Aug 2020 at 8:15pm
|
7.3 bout 3500 or so but wouldnt stay together for many yards IF you had it open! mine runs 60 at 2100 --- I usually never run it much past 1500 to 1750. ---runs better in that range and gets around 16 mpg,--so why hammer it?
------------- http://machinebuildersnetwork.com/ |
Posted By: shameless dude
Date Posted: 03 Aug 2020 at 4:48am
| he just wanted to show off to you that he had a diesel! he'll ram rod it enough and soon he'll be walking! bet it smoked sum too? |
Posted By: FREEDGUY
Date Posted: 03 Aug 2020 at 4:35pm
Sadly Shameless, it was pretty clean exhaust
 ,I could definitely smell it though  . This was a pretty new GM product BTW. I am recalling me as a passenger in a vehicle when the driver "kicked it down" into passing mode on an automatic with a gasser and hitting 5500 rpm's. I didn't know if a modern diesel could hit those rpm's in "passing gear"  |
shameless dude wrote:Posted By: DMiller
Date Posted: 03 Aug 2020 at 6:20pm
| RPM Limits on a Duramax is roughly 3200. Can sound quite high and not be. Tuners can over ride the limiter, to the owner be cautious as to how long, how many times and how much load when pull that stunt. |
Posted By: Eldon (WA)
Date Posted: 03 Aug 2020 at 10:28pm
My 2016 Duramax has downshifted to 4500 with the exhaust brake on, had me worried....only had 1000 miles on it at the time. Didn't seem to hurt it. ------------- ALLIS EXPRESS! This year: |