is a 205 block the same in a pinto as it is in the Cosworth YB?

im not fussed with internals, just the basic bare block

Can i take a bare 205 block from a pinto and use it to build a new bottom end for my YB 2wd?

 

Yes you can without a doubt, you can also use the 200 block if you want.
All that happened with the "yb" blocks were they were plucked off the standard pinto production line based purely on bore sizes, they were microscopically smaller so the walls of the bores were microscopically thicker, the bores were numbered 1 to 4 with 1 being the smallest(thickest bore walls), that's why most yb have the numbers 2/2/2/2 stamped by the dizzy hole, not all 2/2/2/2, my own one is 2/3/3/2.
So use with confidence any 205 block, the 200 block has a thicker skirt around the base of the block, as the sump and of course the 4wd diff etc are supported off this.
tabetha

 

as said above they were all destined for 2.0 sierra's and were just hand picked as the better blocks of the batch and they went into the cosworth. Heard of people using blacks from transits etc, think they were a 203 block

 

As said above they were just selected for there bore tolerance, there is one other minor difference that being the 'Selected ones' have YB then a four digit number on the from of the block. The Transit block talked of above is a 202 block which some people use.

Martin

 

cheers guys, tabatha your a star

 

oohh don't, my heads already swelling ha ha!!
tabetha

 

They ARE NOT THE SAME!!!

I was shown a batch of pintos blocks side by side and you can see that the cast webbing is much much more beefy on some types than others, the strongest being a YB 205 block.

you can build all the Cosworth parts into them, but they aren't as strong. I couldn't tell you at what bhp/lb/ft they'd become a liability though.

 

The ones with the thicker casting are 200 blocks, oddly enough you're talking complete rubbish.
The pinto or T88 to give it it's correct name was codenamed YAA and was 100% PURE pinto, but don't listen to me read read Mario Illien's comments, which went on to state
" comapred with the T88/pinto engine from which the new turbocharged YB evolved almost everything was changed, except fro the cylinder block, front cover and jackshaft, except for these parts all was new.
For those that don't know Mario was the man behind the engineering of the YB, I've a suspicion he knew what was used as he used it and asked for it.
tabetha

 

LOL as said thats utter rubbish!

The 205 as we have said is just a Pinto block nothing more nothing less, this is all the YB is anyway just a jumped up Pinto, the 205 is NOT the strongest block either.

The YAA which was seen by accident when on a visit to Cosworth to look at Formula 1 engine, Stewart Turner asked Keith whats that? To which the reply was "Thats a Pinto with a cylinder head conversion, we believe there is enough demand for it to put into production as a performance part" Nothing more was said. Turbocharging was then thrown in by Stewart's legendry comment whilst consuming a ploughmens lunch at a pub. To be specific "If we turbo charge your Pinto with the 16V head and put it into a Sierra Rover won't win another race" and so the YB was born.

205 blocks can't handle big power, it's a lottery some have run 500HP some have cracked at less, also you can't long stud these.

The 200 block as said is alot stronger, of course I am excluding the YBD 205.

That book your quoting is a good read as well!

Martin

 

in summary you can use the 205 block mate.

I have two in my garage that i will be using to build a yb into.

Plenty of people have had 400bhp without issues on these using standard bolts.

 

im goin to disagree with ye here paul and say they are the same
there s me thinkin you knew a bit about the old fords lol
tbh i think luck has alot to do with them staying together, my supposingly strong 200 block cracked at 420 bhp

 

More down to how they're put together a lot of the time, some can do 200K miles being thrashed every day and not miss a beat, when mapped correctly.
tabetha

 

Not quite right, it was planted there so Fords head bosses couldn't really miss it.

 

just to add; its all good and well finding a pinto block that has 2222 stamped by the dizzy; as soon as you rebore them, the 2222 casting becomes irrelevant

 

There were a number of evolutions of the 205 block, the best at the time being the version fitted in the Sierra 2 litre iS (If I remember correctly they had 205 in bigger numbers cast into the side of the block than the other 205 types) and it was from these ones that the cossie blocks were selected based on optimum bore size of 2222 as stated above.

 

ill be running little more than 300bhp when shes finished so the block should be fine

anymore than that and i think my RWD will become a bit TOO arse end happy!

 

Actually it was "planted" there by marcus heimer, as it was his OWN project he hoped it would be funded.
tabetha

 

Correct, so essentially any 205 block will do so long as it hasen't been bored by much, as I had this problem when I was running with a 'Non selected' block before it was rebuilt.

Martin