Type of Engine Series (i.e. 645, 710)

[M636C]

QUOTE: Originally posted by gemotor

Does anyone have information about what mechanical changes EMD made when raising the 567 engine horsepower from 1500 to 1750 (GP7 to GP9)? Bore? Stroke? If the compression ratio was changed, how was that accomplished? Thanks for any information.

The bore and stroke stayed the same between the 567B and 567C but the major change was in the cylinder cooling. In the B engine they used conventional "wet liners" with water surrounding them. This caused problems with leakage particularly around the air inlet ports at the bottom of the swept area. New liners with water jackets attached were introduced and these were connected by piping (called "water jumpers"). At the same time the whole crankcase was redesigned, and circular access covers replaced the rectangular ones so that the chances of cracking were reduced. These changes allowed the engine speed to be increased from 800 rpm to 835 rpm which produced the increase in power.

So basically, it was a new engine with the same bore and stroke. Most B series engines were rebuilt to take the new liners, but the rectangular inspection covers show up the older type of engine.

The 645E was basically similar to the 567C, (with a few design improvements) but had a greater bore (9-1/16" instead of 8-1/2") and the rotational speed was increased further to 900 rpm, giving 2000 HP from a 16 cylinder engine.

M636C

[gemotor]

Does anyone have information about what mechanical changes EMD made when raising the 567 engine horsepower from 1500 to 1750 (GP7 to GP9)? Bore? Stroke? If the compression ratio was changed, how was that accomplished? Thanks for any information.

[CJBeard]

The train watchers guide may have information on this topic.

[M636C]

There are some good rules of thumb to use determining the engine type.

If the model number is under 9 for an E, F, GP or SD it has a 567B or earlier engine.

Between 9 and 35 for those models, it has a 567C or 567D engine.

From 35 but less than 49, it has a 645E or 645E3 engine.

Locomotives with model numbers 49 and 50 have 645F engines.

Locomotives with model numbers 59 to 80 have 710G engines.

Locomotives with model numbers 89 and 90 should have 265H engines, but many were built with 710 G engines.

Peter

[Anonymous]

Try my site, www.geocities.com/guilford_350

Just go to the EMD section and everything should be there.

[Anonymous]

hey does anbody have a locomotive list (i.e. GP7,GP50, SD40) with the type of engine series (i.e.645, 710 series engine)?