Hi. I have a leyland opd2 double decker with a 600 engine and was wondering if it was possible to put 680 piston and liners in to make it a 680 or maybe its not as simple as that???? I also have a worldmaster with a horizontal 680 which pulls well. I was considering converting it to vertical and making one engine out of the two. any info or suggestions will be greatly appreciated

Thanks

mr.hall wrote:Hi. I have a leyland opd2 double decker with a 600 engine and was wondering if it was possible to put 680 piston and liners in to make it a 680 or maybe its not as simple as that???? I also have a worldmaster with a horizontal 680 which pulls well. I was considering converting it to vertical and making one engine out of the two. any info or suggestions will be greatly appreciated

Thanks

can't help with engine advice but please put up some pics

heres some pics of the old gal

One of these was advertised for sale Dick White Alstonville many years ago repowered a Volvo engine I am not sure what gearbox was hooked up to the motor

thanks for that I'm still weighing everything up. thought about doing an upgrade with a more modern truck engine and running gear but I would like to keep it as original as possible. theres a fine line between orininality and reliability.

DAF truck engine is another possibility. It is a very modernised vertical 0680 and will transform your bus into a pocket rocket, if the gearbox can take it.
Why do you need to go quicker in one of these anyway? I have read that the 0600 is a very reliable and durable motor, arguably more so than the 0680. And it sounds nicer too!!

You may find this topic of interest.
https://www.busaustralia.com/forum/view ... +questions

The difference between a 600 (9.8 litre) and 680 (11.1 litre) are
Cylinder Bore (600) 4.8inches (680) 5.00 inches
Length of stroke (600) 5.500 inches (680) 5.750 inches
So as the crankshaft is different and bore size as well not really able to convert.
All for an extra 25 horses

Maladjusted wrote: All for an extra 25 horses

You will certainly feel those extra horses though!!

Swift wrote:

Maladjusted wrote: All for an extra 25 horses

You will certainly feel those extra horses though!!

Quite a lot when you only have 115 to start with. The longer stroke would hike up the torque figure, which is probably more useful for stop-start bus work.