Engines in Disguise

[Gingerbus1991]

Following on from an off-topic situation on the Mcgills buses page with @Jordan Adam here we all are to discuss engine manufacturing and technology.

Bus engines arent just used in buses and they usually arent made for ones own product.

For example.
A Cummins ISBe 6.7ltr found in the likes of an ADL Enviro 400 MMC is not just solely produced as a cummins product, Scania also use the engine block with a different Turbocharger renaming it as the DC07.

DAF Truck owner PACCAR also use the same unit but rebranded as the PACCAR PX-7 engine.

Renault or Volvo? Whos the true maker.

The Volvo D7E was originally used in trucks at 250, 280 and 320hp for euro5, but the D7E with 290 was produced as a bus variant as a bus required a rise in peak torque at a lower rpm given there used around cities mostly hence the gearbox can upshift earlier improving efficiency yet still maintain responsiveness.
The earlier D7C was originally a 6.7ltr in early D7A form which was used in trucks until it was bored out in size, the D7A can be found in older trucks nowadays but nowdays its actually the D7E engine with the D7A naming for truck use until euro5.
The D7C and D7E engine blocks were both manufactured by deutz alongside Volvo/Renault Truck each as co-developers for the engine, after they are built the engine blocks are shipped to Renault/Volvo Trucks for assembly(Turbo, injectors etc etc).
The D9A/D9B engines that can be found on a B9TL chassis was co-developed by Volvo/Renault Trucks as well but built by Volvo in Skövde-Sweden, the older DH12C and D13C engines found in B12B/B13R coach chassis are also built in Skövde, the D13C is still produced for Euro6 as the D13K for truck use at 500hp.

The latest round of Renault/Volvo co-produced engines are the current Euro6 motors found in the Volvo B5, B8 and B11 chassis, The D5K, D8K and D11K engine blocks are currently manufactured by UB-Trucks at there UB-Buses engine division plant in bangalore-india, which Volvo Group actually purchased from the previous owner Nissan, UB Trucks themselfs based in Japan.

 

[GusB]

I wondered if this discussion might result in a separate thread

The earlier D7C was original a 6.7ltr in early D7A form which was used in trucks until it was bored out in size, the D7A can be found in older trucks nowadays but nowdays its actually the D7E engine with the D7A naming for truck use until euro5.

Would this engine have any connection with the old TD70, which powered the Ailsa/Volvo B55?

 

[Gingerbus1991]

I wondered if this discussion might result in a separate thread


Would this engine have any connection with the old TD70, which powered the Ailsa/Volvo B55?

Bingo! It is actually the same unit just given a new name for modern use.

Of course over the years its just been moderised.

In the 70s and 80s the D7C as we know it today was the successor of the TD70, like said above its the same base unit just with a larger cylinder bore, producing 7.3ltr instead of the 6.7.

 

[GusB]

Bingo!

In the 70s and 80s the D7C as we know it today was the successor of the TD70, like said above its the same base unit just with bored out cylinders to a 7.3ltr

It was the 6.7l figure that prompted my question. Engine development does seem to be rather evolutionary rather than revolutionary. The old Leyland 680 was subsequently developed into the L11 and the TL11 here, but I believe DAF licence-built it at one point (and developed it further), and there was a Polish company (Jelcz?) who also manufactured the same engine. Is there anything current that's still based on it?

 

[Gingerbus1991]

No point in messing if it works, hence the reason volvo and renault have developed engines together for a while, even though some have been better than others.

 

[Gingerbus1991]

Unfortunetly going back to leylands prime is going outside my knowledge zone, more in tune with Volvo, Daimler, MAN and Scania, but of course Leyland Trucks is still in business building DAF trucks these days, may well be some connections if you researched online, the biggest problem with that is the fact the enternet didnt exist in its current day form back in the 60s, 70s or 80s where knowledge is otherwise easily attainable.

DAF did have an 11.6ltr engine which they used from as far back as the mid-70s, it was only recently discontinued a few years back in favour of the fresh euro6 MX-11/13 Range that PACCAR developed, the HGV company I work at has recently took on some DAF trucks with PACCAR MX-13 engines and the New ZF traXon automated gearbox for trial, there surprizingly good and the gearbox shifts rather quickly for an AMT unit, much better than a Volvo iSync/iShift.