2,8? - Page 4

Jason · #31 11-21-2009, 10:21 AM

How do you acomidate the extra stroke and higher deck height? Super thick gasket?

Jason

axL_ · #32 11-22-2009, 04:21 PM

i didnt mean crankshaft i ment block with same stroke but bigger pistons

Jason · #33 11-23-2009, 07:35 AM

Ok so its a diesel truck block thats the same as the D24T but with much bigger cylinder bore to make it 2.8... What are you saying was week then the block, or the crank. Couldn't you use the D24T crankshaft then?

Jason

axL_ · #34 11-23-2009, 02:02 PM

i have really no idea and i dint even know if it's true but i have heard that there is an block from Vw LT55 on 2.8liters

friman · #35 12-12-2009, 01:27 PM

Quote:

Originally Posted by axL_

i have really no idea and i dint even know if it's true but i have heard that there is an block from Vw LT55 on 2.8liters

Not to be a wise man, but you are wrong. There is no bigger "block" in the
D24 series, not even in the LT trucks. Its a very rare crank that makes it possible to reach 2,76litre, and thats with original bore and piston, not oversized stuff. I understand that the block height isnt enough, so probably there is shorter rods made to that crank.

As i wrote earlier the crank was made by some aftermarket firm in germany to stroke D24 in the Lt series, there was Lt trucks with max weight of 5600kg=5,6ton so i understand that the engine had to work hard.

Regards Martin

Jason · #36 12-13-2009, 03:49 PM

I would be suprised that they would go with a shorter rod. You can only go so short before you will have issues with too steep of a rod angle. I would still like to see it. I would be if the same block and bore is used, there is a thicker head gasket that goes with it. The stroke to go from 2.4 to 2.76 would have to be increase quite a bit with only a 76mm bore. I did the math, and to get 2.76 Liters you would need a 100mm stroke which would come out to 2757cc or 2.76. 14mm increase in stroke is HUGE! Thats over a half inch! Still sounds iffy to me.

ThickasaBrick · #37 02-17-2010, 05:16 AM

Hi all. Long time lurker, first time poster.
The rod length to stroke ratio of the stock D24 (and T) is only 1.57 to 1. The con rod length is only 136mm (5.36"). These numbers are already about as low as you would want them. When VW created the 1.9 diesel they bumped those numbers up to 1.80 to 1 and 172mm (6.78") respectively. They raised the deck height to achieve this and the stroke still didn't reach 100mm! (It only reached 95.5mm). They chose to increase the bore a bit more (to 79.5mm from 76.5mm) rather than making the stroke any longer than that already too long 95.5mm. The point is that unless there is a 6 cylinder version of the 1.9 (which would be a 2.85L), this mystery engine didn't happen. Too bad too because that would be a sweet engine.
http://books.google.com/books?id=bE1...age&q=&f=false
http://www.not2fast.com/vw/stuff/vw_engines.shtml
Regards, Eric

ThickasaBrick · #38 02-17-2010, 05:24 AM

Testing my sig.

piper109 · #39 02-17-2010, 06:58 PM

My Swedish is not good but I believe I heard him say it was 2.4 liter bored out to 2.8 liter, has 260 HP, 500 kN torque. That is a lot of torque! I think he said that he has some parts from an Iveco truck in his description.
It sounds pretty nice and isn't that an old 142 ?

Steve

Jason · #40 02-17-2010, 07:44 PM

I did the math and boring the block out to get a 2.8 isn't possible, there isn't enough material. I also agree with what Eric said, though I didn't know what the rod length was untill he posted it. In the VW engines I build, we don't go any more than 82mm stroke with the stock 5.35 length rods (same in a air cooled vw as a D24... interesting). Anything above that and the rod angle is too steep and you get excessive side loading on the piston. I have heard of people building a 84mm stroke with the stock rod, but the rod almost hits the piston skirt. I guess the 86 stroke in the d24 works because of the shorter piston skirt.

Jason