peteh

iTrader: (3)

How do you tell them apart?? I know they both say 205 on the side but are the engine numbers specific for cosworth ones??

any help please

pete

jon@work

iTrader: (5)

cossie blocks have the bore sizes (eg 2232) by the dizzy - I don't think non-cossie blocks have these

richm

IIRC the sizes marked by the dizzy relate to main bearing gradings, and all pinto blocks have them
I believe the cossie 205's are standard blocks selected for bore casting thickness and concentricity, which I don't think is physically marked on the block

xr4x4rs

iTrader: (5)

i read somewhere on here about this

sure it was graceland that put it , but the markings are a sort of grade as mentioned, being bore or main i havnt a clue

but they are located by the dizzy and the lower the number the better the grade as they were hand picked

i think all cosy blocks were number 2222 by the dizzy

well my 205 block im using is anyhow

richm

my mk2 rs2000 pinto block had 2222 grade markings by the dizzy.. 1979 block

cossie4i+

iTrader: (15)

I used a normal 205 block on mine for 9 years

But it cracked this year

Steve.

peteh

iTrader: (3)

so the mith about 200 blocks being 'better' is true?

peteh

iTrader: (3)

what boost were you running?

cossie4i+

iTrader: (15)

Was using 22psi but only for the last 3 years, was running 14psi for 6 years.

Steve.

peteh

iTrader: (3)

was it overbored by much?

Jay,

iTrader: (4)

as far as cosworth are concerned a 200 is only different below the bores where the block is thickerfor 4x4 transmission , they did say that if your guna buy a 200 block nuy a ybp one because of oil ways

cossie4i+

iTrader: (15)

.5 pistons.

Steve.

peteh

iTrader: (3)

that's not good

WD Pro

I thought the 2222 indicated standard bore sizes ?

Stu @ M Developments

iTrader: (12)

Cosworth asked for only grade 2 and 3 bores be delivered to them by Ford so the genuine Yb blocks will all the gradings of 2 or 3 stamped by the dizzy. Once you have rebored it this becomes entirely irrelevant.

richm

so the dizzy markings are referring to bore grading then? sorry my in that case..

Wasn't there any selection relating to bore casting quality in terms of thickness and concentricity? Pinto bores were renowned for being offset in the casting, so making the cylinder casting thinner one side than the other.

JTECH James

iTrader: (13)

how are they graded?

COMEDY DAN

If you speak to Jondel Race Engines, Pete Jones, he said to me that the place on the blocks where they commonly crack, there is no difference in strength on either block.

He has been building cosworth engines for 25 years, a very clever guy.

peteh

iTrader: (3)

that's who is specin mine . and jambo

COMEDY DAN

Pete Jones is one of the original Kings of the Cosworth.

I remember a white saph they had 8 years ago that did 197 mph

Jondel, never a company to shout about their quality, and far too busy to come on here.

Top quality engine builder imo.