Whats the deal with the BOSCH CP-ISB21S3 pump?

[Bug Out]

I was reading on the HD RAM board this was the pump that was to replace the CP-4 and is actually the pump being used in 2021 forward? Or is the numbers actually mean its a CP-3? So much dis and mis information floating around.

TIA

 

[Wiredawg]

The way I read it it's a CP3. Google that number and see what comes up. I cant say this as an absolute fact, but my 2020 International Durastar Cummins 6.7L has a CP3, which makes me wonder if the only Cummins 6.7L with the CP4 were Ram spec'd motors.

Recommend downloading Cummins Quick Serve where you can enter your Cummins ESN and get ALL the build info on your motor, including build date.

Cheers, Ron

 

[AH64ID]

The way I read it it's a CP3. Google that number and see what comes up. I cant say this as an absolute fact, but my 2020 International Durastar Cummins 6.7L has a CP3, which makes me wonder if the only Cummins 6.7L with the CP4 were Ram spec'd motors.

Recommend downloading Cummins Quick Serve where you can enter your Cummins ESN and get ALL the build info on your motor, including build date.

Cheers, Ron

Its not uncommon to see different engine model years in rigs like that. What is the date on the motor?

 

[HPSimpson]

Says made in Czech Republic I don't read Czech.

 

[Wiredawg]

Its not uncommon to see different engine model years in rigs like that. What is the date on the motor?

16 October 2018

 

[AH64ID]

16 October 2018

That would be a MY18 motor which likely explains the CP3 over the non-Ram application.

 

[Wiredawg]

That would be a MY18 motor which likely explains the CP3 over the non-Ram application.

Are you saying Cummins installed CP4s on some/ all non-Ram spec'd motors after a certain date?

 

[AH64ID]

Are you saying Cummins installed CP4s on some/ all non-Ram spec'd motors after a certain date?

I have read that they did, but have not seen one in person either way (CP3 or CP4).

The CP4 was a Cummins spec'd item and not a Ram spec'd item.

 

[Wiredawg]

I have read that they did, but have not seen one in person wither with (CP3 or CP4).

The CP4 was a Cummins spec'd item and not a Ram spec'd item.

I knew Cummins spec'd the CP4. It seems Cummins did a clean cut for pumps at least for the Rams spec'd motors as no 19 thru 20 Ram Cummins received CP3s. And as mentioned, Cummins max's HP/TQ on non Ram spec'd ISB motors to 360/800. I think that's interesting Cummins does that, maybe they would create competition with their ISC motors if they produced higher rated ISBs for their non-Ram market, particularly RV where bigger HP/TQ desired.

Cheers, Ron

 

[JR]

I firmly believe the HP numbers in the pickups are purely marketing with a heavy dose of torque management to mellow things out.

If you look at Cummins website their HP ratings and duty cycle are correlated. High HP, low duty cycle. Low HP, high duty cycle.

C&C trucks, MD rigs, motor homes, etc etc are generally lower HP. Longevity, lower gear ratios, etc all play a role in the big picture.

 

[Bug Out]

Its not uncommon to see different engine model years in rigs like that. What is the date on the motor?

No idea. From how it read, it came from a RAM on the lot? Where I don't know.

 

[lpennock]

No idea. From how it read, it came from a RAM on the lot? Where I don't know.

There is a data tag on the side of the motor that tells among other things the date of manufacture.

 

[Wiredawg]

I firmly believe the HP numbers in the pickups are purely marketing with a heavy dose of torque management to mellow things out.

If you look at Cummins website their HP ratings and duty cycle are correlated. High HP, low duty cycle. Low HP, high duty cycle.

C&C trucks, MD rigs, motor homes, etc etc are generally lower HP. Longevity, lower gear ratios, etc all play a role in the big picture.

Absolutely correct. The Cummins 6.7L ISB, regardless of "rated" HP/TQ, all have the characteristics of strong pulling/loading accross a nice RPM powerband. What I'm anxious to get the full experience on is the 5th Gen Allison transmission. From what I've read, it has some nice electronic controls and user selection for performance and economy.

Waiting on Fantastic Fan to arrive to fill opening where I removed the only cheesey feature on this RV, the noisey, crappy little exhaust fan in the bathroom, so I can take it to Internatiional on Monday to have EB programmed and switch installed.

All I can say is I LIKE Cummins!

Cheers, Ron

 

[nukegm]

Absolutely correct. The Cummins 6.7L ISB, regardless of "rated" HP/TQ, all have the characteristics of strong pulling/loading accross a nice RPM powerband. What I'm anxious to get the full experience on is the 5th Gen Allison transmission. From what I've read, it has some nice electronic controls and user selection for performance and economy.

Waiting on Fantastic Fan to arrive to fill opening where I removed the only cheesey feature on this RV, the noisey, crappy little exhaust fan in the bathroom, so I can take it to Internatiional on Monday to have EB programmed and switch installed.

All I can say is I LIKE Cummins!

Cheers, Ron

comrade ron - have you heard when the transmission is coming out? lots of speculation its next year. figured you might know more. cheers sir!

 

[Wiredawg]

comrade ron - have you heard when the transmission is coming out? lots of speculation its next year. figured you might know more. cheers sir!

Brother Chris,
Allison is in my 2020 International Durastar. I don't know of any Ram plans, but honestly, I love Aisin in my current 5500 and previous 4500. Not sure Allsion is an improvement, just another tested transmission.

Cheers, Ron

 

[Cummins12V98]

Brother Chris,
Allison is in my 2020 International Durastar. I don't know of any Ram plans, but honestly, I love Aisin in my current 5500 and previous 4500. Not sure Allsion is an improvement, just another tested transmission.

Cheers, Ron

I am assuming your MH has a "REAL" Allison.

 

[Ozymandias]

I am assuming your MH has a "REAL" Allison.

Are there "fake" Allison's?

 

[AH64ID]

Are there "fake" Allison's?

The current GM 10 speed Allison is a fake Allison.

 

[Ozymandias]

The current GM 10 speed Allison is a fake Allison.

Isn't Allison a subsidiary of GM?

 

[SnoKing]

Isn't Allison a subsidiary of GM?

June 2007—GM announced that it was selling Allison Transmission to private equity firms The Carlyle Group and Onex Corporation, in a deal valued at $5.6 billion.[17] The transaction closed on August 7, 2007.