Track T-800 CDI

I'm not sure why diesels end up heavier than petrols, but most likely it does have to do with the more complicated design and higher compression ratios (diesels compress the fuel/air mixture 'till it explodes and don't use spark plugs)

Originally Posted by injury_ian

500Kg wet!

"you ain't never picking that one up after a drop!" lol

I think you misread the tech sheet. It says it weighs in at 225 kg dry, so I don't see how you got the 500kg wet

[yorkie_chris]

Originally Posted by andreis

(diesels compress the fuel/air mixture 'till it explodes and don't use spark plugs)

That is completely wrong!

If you did that the engine would eat itself.
Diesels compress a fuel air mixture until very hot THEN squirt in fuel which instantly ignites.

The burning in a diesel engine is more akin to spraying an aerosol can over a lighter flame. It's a steady burn.

Originally Posted by Alpinestarhero

The engine itself is made by dialmer benz (sp!), and is apparently in use on some smart cars. 49 bhp is not going to set anyones world on fire, but consider that it's made at only 2,750 rpm, and thats not bad. Max torque is the more interesting figure though - 88 lb ft at 1,800 rpm which is allegadly carried through to the rev-limiter, cutting in at 4250 rpm could mean a bike that would be great for town riding and easy long distance trips.

Am I the only one to notice how obviously wrong the torque claim is? If it carried 88lbft of torque to the rev limiter max power would be at rev limiter. I would say that it drops off before 2750rpm and after that falls through the floor.

Ill admit though that fuel economy is nice... But why not get a little 125 where you can get even more? And it wont sound like a pile of ****e

Originally Posted by andreis

I'm not sure why diesels end up heavier than petrols, but most likely it does have to do with the more complicated design and higher compression ratios

Erm, the diesel bike is running lower compression than most modern petrol bikes. High pressures come from turbo not from the piston squash.

[yorkie_chris]

So the effective compression ratio is high. Makes no odds, still needs a strong block.

I'd be surprised if the normal compression ratio was less than 16 or so.

Sorry, my bad.. Must of heard the correct version at some point, then some odd memory distortion got in the way of it being retold correctly

[yorkie_chris]

Diesel fuel pump is almost exactly like distributor in a petrol engine, only it distributes fuel instead of spark.

Look up "detonation" in engines to see what happens if fuel is in there too soon.

Originally Posted by yorkie_chris

So the effective compression ratio is high. Makes no odds, still needs a strong block.

I'd be surprised if the normal compression ratio was less than 16 or so.

Sorry, I been thinking about starting a lot recently (I had a few issues, now sorted, HT lead issues!) and I thought about compression at start up lol.

[yorkie_chris]

Nah I wouldn't expect it to be a bother. Remember also that with high compression ratio and diesel (direct) injection you aren't relying on gas speed to mix your fuel charge up for you.

Heater plugs draw a bit of power but not much. Biggest problem I reckon is it is common rail. Too much electronic boswallox.


N.B look on the website. CR is 18:1

Originally Posted by yorkie_chris

That is completely wrong!

If you did that the engine would eat itself.
Diesels compress a fuel air mixture until very hot THEN squirt in fuel which instantly ignites.

The burning in a diesel engine is more akin to spraying an aerosol can over a lighter flame. It's a steady burn.

Essentially, he was right, but here you take the matter one more step advanced; from what I understand, there is a small "pilot" injection of fuel that occurs, which pre-heats the combustion chamber then further fuel is injected. From what I've read, there can be multiple (more than 2) injections per combustion cycle

I suppose the weight comes from having to be quite a strong engine. I assume aswell what unlike a normal motorcycle engine, the diesal engine used in the track will not need the valve clearances checking every 16,000 miles since the oil pressure will maintain the clearances required - thats a nice little bonus any day of the week!

I still like the idea, shun me if you all will!!!!!!