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leyland 600/680 conversion

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leyland 600/680 conversion

Postby mr.hall » Wed Jan 11, 2017 11:28 pm

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
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Re: leyland 600/680 conversion

Postby CCCC » Thu Jan 12, 2017 11:12 am

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
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Re: leyland 600/680 conversion

Postby mr.hall » Sat Jan 14, 2017 12:56 pm

heres some pics of the old gal
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Re: leyland 600/680 conversion

Postby mr.hall » Sat Jan 14, 2017 1:00 pm

:D
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Re: leyland 600/680 conversion

Postby Bedford-29 » Tue Jan 17, 2017 8:22 am

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
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Re: leyland 600/680 conversion

Postby mr.hall » Wed Jan 18, 2017 11:12 pm

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.
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Re: leyland 600/680 conversion

Postby Herbert » Fri Jan 20, 2017 6:23 pm

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Re: leyland 600/680 conversion

Postby Swift » Tue Jan 31, 2017 10:48 am

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.
viewtopic.php?f=2&t=66765&hilit=leyland+questions
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Re: leyland 600/680 conversion

Postby Maladjusted » Fri Feb 03, 2017 8:18 am

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
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Re: leyland 600/680 conversion

Postby Swift » Fri Feb 03, 2017 9:52 am

Maladjusted wrote:All for an extra 25 horses

You will certainly feel those extra horses though!!
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Re: leyland 600/680 conversion

Postby boronia » Fri Feb 03, 2017 6:10 pm

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.
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