Not sure if this has been posted here before. Tried to search but couldn't find any threads on it.

http://www.cosworthusa.com/store/pc/...8&idproduct=28

Price $ 5.999.00

Strangely, this part is only found on the Cosworth USA website. No mentioning of it on the European website...



This Ford Cosworth YB aluminum cylinder block is a direct replacement for the European spec thick deck 200 iron block and can be used for 2wd or 4wd wet sump or dry sump applications. It is intended for normally aspirated or turbocharged engines. Cast from LM25 and heat treated to T6 condition for uncompromising strength. The large, robust shot peened cast alloy main caps are located with precision ground ring dowels and secured using a 12 mm high strength stud, washer, and nut kit. The thick-wall bores can accommodate dry iron straight thin wall liners in 90.8mm, 92mm, 94mm, and 96mm or the bores can be left unfinished allowing other liner types to be installed. Additionally, crankshafts up to 88mm stroke with high performance rods are acceptable. The deck height is finish machined to original specification 207.5mm, but is also available with a 217.5mm deck for long rod and/or stroker crank application. Unlike the iron block with limited material beneath the threaded head bolt/stud holes, this block features large cast pillars that extend internally from the deck to the crankcase portion of the block, which permit the threaded stud holes to be machined deep into the block; however, the stainless steel threaded inserts are installed at a depth to accommodate standard head bolts or an aftermarket head stud set. The combination of large internal pillars, thick cylinder walls and deep cast deck provides a very strong and stable block making through block stud arrangement unnecessary. Unless otherwise specified, each block is meticulously finished machined and arrives with the finish honed liners, main caps, main cap studs, bungs, core plugs, ring dowels, and head stud inserts installed.

 

Would be interesting to see how much abuse it can take.

 

i'm sure we will when the big money boys start tuning them to the moon woohoo

 

That sounds pretty good.

2550cc would certainly spool up turbos nicely!

 

is that basically the same as a millington diamond block though albeit made by cosworth? so would be able to withstand the same power?

 

If you price up up getting a 200 block and machining it properly, and long studding it etc, that is actually looking really cheap if we ever get back to 2 dollars to the quid!

 

agreed

just need someone to test one now; i guess they would have better tolerances to cyclinder pressure than the old 200 blocks

 

I wonder why they didnt incorporate a girdle while they were at it.

 

I spoke to Cosworth US about this when it first came out and asked lots of details and got lots of answers,
But it came down to we have not run it that hard so cant say for sure it will take it. Only that the Scooby one we do has run up to 1000hp but this is not that engine.

Mark

 

Happy days!

 

arent they more popular with straight 6 pot engines to help stop the crank from moving in the middle under massive pressures?

anyone got one fitted to a YB you're aware of?

i also thought the YB crank construction and assembly was pretty bullet proof in standard form? (within reason ie not 1000hp,)

 

just need a wealthy cossie owner to invest and have you try and break it then Mark

 

Lots of 4 pot motors run them too, and dont forget the standard YB you are talking about is made of iron.

Im sure cosworth know what they are doing FAR better than me though, so I guess if it doesnt have a girdle its cause it doesnt need one, id just like to see the decision making process for it if that was possible, which im sure it isnt!

 

Can you share a bit more about the questions and answers? The first thing that comes to my mind is why they made it in the first place!

 

fair do's; as you say; i'm sure Cosworth knew what they were doing with this upated block

wernt aware 4 pot motors ran them; would have thought it would have been overkill; although i suppose it depends on the application & purpose

 

Just as an example:

Standard vauxhall vectra 1998 2.0 16v = got a girdle

 

you learn something new everyday

 

 

Chip: what a girdle is, can you show? I don't understand the word and I don't want to spend half of the night googling if you can tell me simply? I am guessing is it the type of one piece set of main caps as used on 4G64 Mitsu Evo?

 

IMO you would need to change the sump also due to the clearance on the front lower section of the sump.

Mark

 

which in turn will mean the oil pump & pick up pipe would need modifying too wouldnt it?

 

so basically one of roys old employees has gone and worked for the competition and said ey up what about a alloy block yb then made by cosworth.

 

A girdle is a brace across the bottom of the block bolted to each of the mains caps.



Mark, fair point about the other bits needing changing too, I suppose it wouldnt be a direct replacement then.

 

Im sold, where to buy?

 

The sump will accept a girdle with minor mods, my Millington had one.

 

http://www.cosworthusa.com/store/pc/...8&idproduct=28

 

Cheers worked out Ł3,650 ordered

 

Does that mean that you have ordered one? Good luck if that's the case.

What they need to do now is to remake the cylinder head as well. I think I heard some rumours about that on this forum.

 

I know quite a lot about these and other developments to do with them but I'm sworn to secrecy I will use one in the future but not right now, can't say why.

Bit of a useless reply I know

 

 

burtons sell the alloy yb block by cosworth

 

are you building a competitive time attack car?

 

Useless in a way, maybe. But oh so interesting from a different perspective. Indicates that there might be new and interesting developments in the world of Cosworth tuning...

Looking forward to more information with great anticipation.

I've been to the Cosworth factory in Northampton and did tour of the facilities. This was when they where preparing their last F1 engine. Got to see the V8 on the dyno and all the other bits (apart from some places) of the F1 and road engine departments. Impressive stuff. Especially the F1 pistons, cranks, cylinder blocks and camshafts.

 

Cosworth Inc are only marketing the block.
The block is made by ex-employees of a UK company on the other side of the world.
A highly respected UK based tuner is doing an assessment for a high power YB build.
I have seen the block in N/A use, I have doubts it will be suitable for big horsepower use (not what it was designed for and I am no expert)

Steve

 

what are your doubts about it in high HP application then mate? interested to know

 

Most of the Honda's i've stripped have and Evo's have.

 

Torsional rigidity and overall strength, aluminium is weaker than cast iron.
Hypothetically, if the alloy block was cast using the original cast iron mould, would it not be weaker ?
I know the have introduced more metal to the stud areas but the block wall thickness is less.
When Ford and Harts did the BDT and BDT/E four bolt main caps were used and much more metal was introduced to strengthen the block in the main bearing area and a dry deck format was used to improve the rigidity of the deck face.

Steve

 

i cant see why it shouldent hold together?
The evos produce what 1500bhp now on alu blocks?
Why should this one not hold together for 600+bhp then?

 

I'm no expert on engine blocks either. However, first of all I find it hard to believe that Cosworth have just poured aluminium alloy into the old Ford block mould. Second of all, when I did the tour of the Cosworth factory none of the racing engines had cast iron blocks... And on F1 cars the blocks have to cope with being a stressed member of the chassis as well.

I don't know any details of the Cosworth YB block so I cannot comment on the actual strength of that particular design. There is however nothing to indicate that a aluminium alloy block should'nt be able to cope with high power outputs and torsional rigidity issues. Quite the contrary I would say. Cosworth should have plenty of experience with aluminium alloy blocks in high power/torsional rigidity applications. Hence they should have the necessary know how to make this a rigid and solid block (I don't know if this particular design has those qualities though - just that it should be possible).

Any other, better educated, views on this?

 

so it is a cosworth branded millington block then? like the one on the old reyland escos?