I'm trying to find out the physical demensions of the engine that is used in the current Humvee, for scratchbuilding purposes. Another question in this question is, is the crankhouse the same size as a modern big-block engine?? I don't know if a diesel motor and a gasoline motor have the same crankhouse sizes. I have the dsm for the Humvee engines, but haven't been able to guess the size of the block, cause if I can find that out I can use the manual to make one.

Thanks in advance!!

I've found the dimensions I was looking for with the gasoline engines at The Engine Factory. Now all I need to figure out is if the dimensions hold true for the diesel block too.

Any ideas?

The HMMWV uses a Chevy 350cid diesel. I used a left over Tamiya M113 engine as a starting point for one I scratched up for a HMMWV.

Good luck.

Great thanks for the info and tips. I've got a couple of M113's in my stash so I'll take a look at it!!

Something about the 350 cid just bugged me, cause I thought 6.5 liters would be more cid.

From Google I got 6.5 liters = 6500 cubic centimeters = 397 cid

IIRC they use the same basic Engine block casting. they don't burn as Hot as Gas does Thus creating less stress. they can get away with boring the blocks larger.

I thought compression was more of a factor. Normal compression in a gas engine is roughly 9:1, but diesel is like 20:1. The extra boring probably matter that much I guess...

I dont mean to disagree with Matt, but diesel engines do technically run hotter then gas engines. This is why when you look at a diesel vehicle, you will note the massive cooling system and radiator. Even the cooler lines to the transmissions (automatics) are huge. DIesels work by heating a glow plug and getting it hot enough to combust a heavier diesel oil like diesel, JP8, or even Kerosene. Gas engines ignite a an atomized mixture of gas and air (which is much more flammable) using a spark plug that does not get as hot as a glow plug. You can throw a match at a puddle of diesel fuel and not even ignite it, the match just isnt hot enough. Dont try this with gas though LOL FYI, a 350 is a 5.7 liter engine. Chevy did make a small block diesel some years back as I recall, but I dont think it is in production any more. A 6.5 is like you said a 397. A 397 is a big block engine while a 350 is a small block engine. If youve got a chevy dealer near you somewhere, go do some fake car shopping and take a peak under the hood of a diesel 3500 series truck. You will find the same 6.8 engine thats in the Hummer. I cant speak for the Hummer, but my friends who have chevy tow trucks with the 6.8 in it HATE the motor. Its expensive to repair and breaks down frequently. There are especially problems with the diesel injection pumps on those motors. Sorry I dont have more to conrtibute to your question, but thats about the extent of what I know about that motor.

Gary

I know Chevy's are sold here, it is just to find out by whom since there are no dedicated Chevy dealerships here. This is turning out to be a harder question to answer than I thought. I thought it would be common knowledge, but then again do I know the length of my motors in my own cars?? An inline 4 and an inline 5, doesn't do me any help...LOL

Thanks alot everybody!!

It's a different engine. Although it shares similari design principles (including a similar pattern for the bell housing), the vehicle is the post-350 c.i.d. development. It was re-designed to provide greater torque and reliability. The older 350 version, which was a conversion from Chevy's gasoline engine (with modifications) was not as reliable, and was dropped off the production line a few years after it was entered, in favor of the newer design. I've worked on both, definitely different engines, although related.

Jed

Actually diesel engines run cooler than gas, try starting one during a Canadian winter without plugging in the block heater

The cooler lines to the tranny's are larger because of the added torque that the diesel engines developes is harder for the tranny's to handle.

The glow plugs (if used, depends on the engine/application) are only used for start-up and shut down afterwards, again because they tend to run cooler and require more heat for start-up.

They diesel engines ignites the inject fuel by heat of compression; intake stroke=pull in fresh air; compression of confined air=heat; inject fuel=bang!

To get the air hot enough to ignite the fuel you must have higher compression ratios than your average road car, diesel=18 to 24:1 while your mom's grocery getter is around 7.5 to 9:1.

And yes diesel is less flammable than gasoline (much higher octaine rating) so that the burn is more controlled in the engine.

And yes the 6.2 litre diesel in the hummer is ROUGHY the same size as an old school chevy big block.

The 6V53 NA engine from a M-113 is only a V-6 and would not look right, major mods involved to convert.

cheers

I disagree. It is a good starting place. The M113 engine looks the part and fills up the HMMWV engine compartment. Once you add all the bits and pieces, it looks pretty close to me, but you can be the judge yourself...

Like I said it woud take lts of scratch .

Nice job by the way.

cheers

Not to detract from your scratch building project, but CMK does make an engine for the hummer

Yes they do, but why shell out extra cash when the engine and compartment details can be easily made and from left over parts. More cost effective and I like scratch building.

Here, here Gino! Great job on the motorroom!!

I like to model on the cheap!! If I can do it myself I will. It is the process of building a model that is the real thrill for me. Something that keeps me from doing a large amount of modelling is the fact of what to do with it when its done!! For this purpose, I wish I had my own set up so I could build a model, enjoy it for a while then mash it up and make something else out of it.

Thanks all for the tips and all!! Anybody know the dimensions??

OK... Sorry.. I was 1/2 asleep LOL the basic block design IIRC is the same. Yeah the compression is Drasticly higher........ Like Gino points out the M113 engine is a starting point if ya got one... If not CMK does make a engine compartmnt for the HMMWV I Agree w/ Gino that once you fill p the compartment with all the acc'ys it's damn full in there. and hard to see some of the smaller details

I just looked at CMK's engine and it is the capartment tub, not the engine per se. Sort of what I was looking for but not really.

And I thought this was an easy question!! I guess I'll have to play around and see what I come up with... Thanks again all!!