3doorcozmess

Hi people

What's the most power you've achieved or seen achieved from a 205 block

Si

gjh

Wasn't steve (cossie4i+) making 460dd at the wheels in his xr4i with a 205 block?

mgtkr1

I think it may have been 480bhp but that's splitting hairs at that power. somewhere in that ballpark though

COLEYST200

iTrader: (3)

The 205 block is a good block for 400 bhp there is not much need I my eyes to go any more than that . My focus Cosworth runs about 400 and I'v crack a 205 block at that power . It did last for 2000 miles ov hard use running 30psi

Staffi

iTrader: (1)

Ran 440 on mine for a year or so and no problem, before that it was running 411 for about 5yrs.

I know Dingy and Brom ran 500 and as mentioned Steve is also, depends on YOU personally and how far you want to push it, imo I'd opt for a 200 block of costs allow.

scoooby slayer

iTrader: (4)

I have known one crack at 330 hp years ago but it was on a 1mm overbore and had done plenty of miles

Caddyshack

Mine is at 470, don't know how it will last as it has only just started at that power.

JamesH

iTrader: (21)

Mine was on +1mm and did 12k miles at 350hp

markk

iTrader: (2)

Problems arrive on overbored 205s.

The blocks rot from the water jacket into the bore.
Liner them, job sorted.

RWD_cossie_wil

iTrader: (9)

350+BHP & your block is on the limit of sensible power. More, & you are on borrowed time, the power vs reliability graph drops rapidly over 400 BHP. Yes there will be exceptions but in general every 205 block I have seen over 15 years of Cosworth ownership in 205 form WILL crack at some point, be it bores or headbolt areas. If you are spending on a serious engine the only place to start is a long studded 200 block IMHO, it's just a false economy to do it with anything else.

3doorcozmess

Any one else seen big power from a 205 block

Si

gjh

What if you converted the block to liners? Would that be worth doing or a waste of time?

Fezman1

iTrader: (1)

You could see big power - but for a limited time.
I would say circa 400 is the boundary for a 205.
but there are always exceptions. some will crack before that some can go above and beyond.
Depends on the block, bore size, casting variations etc etc. Then if its bored out, been linered, etc. I even know of a couple that had enough meat in them to be long studded.
Then you get down to how its spec'ed and well its built up. pistons,cr, management and mapping - all go toward how well and how long the engine will perform.

What do you have in mind? or is this just a general question?

Staffi

iTrader: (1)

I didn't think 205 blocks could be long studded due to the waist of the block not being thick enough?

Billy_RS

iTrader: (5)

I think 400 is the limit really. Anymore and your asking for trouble.

Obviously not in all cases as there will always be people with more or less power cracking blocks but I'd say 400 is about where it stands.

ginner

iTrader: (1)

Mate stop fucking about do it right and do it once

3doorcozmess

I would of installed a 200 block if the previous owner didn't put a brand new 205 block with new pistons in just before I bought it. They have only done 1000miles

It is crazy the amount of opinions that are out there I've heard of some Karl norris builds 400-500 bhp cars are not long studded. Also what cracks the blocks??

scoooby slayer

iTrader: (4)

don't worry about long studding standard head bolts are fine for a t4 at 2.2 bar with a wrc headgasket, I ran it no problems at 472 hp.

LHD220Turbo

iTrader: (4)

but he builds them on 200 blocks not 205. 205 blocks are a lottery when upping the power.

3doorcozmess

What block?

scoooby slayer

iTrader: (4)

that was on a 200 block, the point im making is standard headbolts are fine ime.


ive had a 1mm overbore 205 block crack up the bore but it did lots of miles and abuse at 350 hp first.


I wouldn't be worried about running a 205 at 500 hp on standard headbolts as long as the block isn't overbored and isn't rotted to badly from inside out in the water jackets.

3doorcozmess

The block is as good as new only done running in miles. Was bought new from ford some time ago and sat under his stairs. The previous owner pay 1k for it. It did come with new pistons and low miles con rods and crank.

Cos500

Wanted 400 bhp from mine and I'm building it from scratch, I sold my 205 block as it was .5 and let's face it I want it reliable so I changed it for a 200 block.
On a standard 205 bore I'd have used it for stage 3 350ish bhp but no more although they can do it.
No point long studding for me, waste of time and money as standard bolts are fine for power I need.

PF Ben

iTrader: (1)

Just tune what you have to where you want it, enjoy it, but be prepared for it to let go at some point. Use what you have to have some fun, it owes you nothing. Then in my opinion build a replacement on a long studded 200 block...

...that's what I'm going to do - I'm enjoying the 205 at 415bhp, am NOT going to invest any more cash in trying to make the 205 stronger, I'm just seeing it as a consumable!

WHEN it does go, I will invest in a long studded 200 block build, but for now and until it blows up, I'm having a great time!! Life's too short to worry about it, just drive it!

Ben

turbotrev

Totally agree with Ben

Cheers Paul

3doorcozmess

Also agree with you ben.

Just want to know if 480bhp is achievable from a 205 block and has any one done it. I bought my saff last year and want to get good use out of it this summer. I don't want to blow it then have to source a 200 block and swap every thing over yet If it does let go I hope it's at the end of the summer lol.

Nash

iTrader: (3)

I ran 450bhp on a 205 block with a T4 running 2bar for about 4-5years and never killed the block. Infact the block is still sat in the shed at home waiting for a rainy day. i just kept hammering it until something gave out.

Tbh i think its a bit of a lottery on a 205block at 400bhp+ some fail others dont, alot will come down to how good the block was to start with. The 205 block i used had never been over standard power or bore until i had it machined for my uses, the block had been stood for over 10 years without water through it as well.

bigdel

Interesting discussion about the overbored 205's being weak. My original engine (it was removed in 1995 after the head gasket went and one of the bores got badly scored), was replaced with a 2nd hand short engine and I've only now, 20 years later, got round to having it rebuilt.
The score in the block necessitated a +1mm overbore, with new rings and pistons. I'm not considering massive power, just want a moderate tweak to around 300bhp.
Before the engine came out it had done ~30,000 miles, and has been dry stored for all the time it's been out. I assume I'm safe(ish) at 300bhp, or am I going to be running on borrowed time?

Rod-Tarry

That will not be as good as an old Block that has been heat cycled over time . Stop grasping at Straws either run sub 350 Power or use a 200 Block.

scoooby slayer

iTrader: (4)

if its on standard bore rod and not rotted from the jackets it should easily run more than 350 hp reliably.

Rod-Tarry

I can only give advice cant force anyone to do anything if they are wise they will listen. The decision on this build is being made on money grounds & that's one thing you don't do when building a YB to be reliable. The suck it & see approach will mean another thread in a years time on a rebuild caused by a 205 cracked block with the comment it ran 450bhp for a whole year . Its another how much Power will a T5 take as they rebuild there 3rd Gearbox.
DOING IT ONCE MEANS DOING IT RIGHT. that's always been my Motto.

cozzy jeff

iTrader: (4)

anyone had a Turkish block long studded??

Jay,

iTrader: (4)

This is correct but many are held back by a budget

Yes they seem ok up to 500 but any further is a bit dodgy seen a few crack in half at 550+

cozzy jeff

iTrader: (4)

Yes they seem ok up to 500 but any further is a bit dodgy seen a few crack in half at 550+[/QUOTE]

I don't intend to get anywhere near that just looking into building a bullet proof bottom end,are oil jets a worthy mod or is the spray bar good enough.

sierraforlife

How about this one …


Source: http://www.burtonpower.com/cylinder-...pe-sc1209.html

>>>>>>>>>>>>>>>>>>>>>>>>>>>
Cosworth YB RS500 thick wall motorsport type

Product Description

A very limited batch of genuine RS500 Cosworth YB motorsport blocks are now available. Machined from original castings, these blocks are stronger than the 4wd 200 block. All blocks are machined to take 6 long studs and are also machined for piston spray jets. Blanking plugs are supplied for applications that do not require the jets. Machined to original bore size and deck height, they also feature billet machined steel main caps. Supplied with oil gallery and water jacket bungs and core plugs. Long stud kit and piston spray jet kit can be supplied at additional cost. Std bore size.
Ford Cosworth YB 16v Turbo
Application: Ford Sierra RS Cosworth 3 door 1986-1987
Ford Sierra Cosworth RS500 1987
Ford Sierra Sapphire RS Cosworth 2wd 1988-1989
Ford Sierra Sapphire RS Cosworth 4wd 1990-1992
Ford Escort RS Cosworth 4wd T34 1992-06/1994
Ford Escort RS Cosworth 4wd T25 06/1994-1996
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

If you intend building a “bullet proof bottom end” and IF it’s true what is claimed in the product description, I think there is no better block for cossies available – not only for big power cossies.

Does anyone know more about this block/offer?
I'm interested myself ...

scoooby slayer

iTrader: (4)

for £3k though surely a linered 200 block would be cheaper and even stronger at this price level for a bare block ?

ajamesc

I did on my old engine but one of my Pistons let go and put a hole in the side of it lol

ajamesc

I'm going for 650 and was told I don't need oil spray jets with a standard crank. I only need them if I fit a more modern crank with a counter balance on each journal

steveboyslim

Who told you that ?

Steve

markk

iTrader: (2)

Top info there, like the std yb crank isn't counterbalanced 😭😪