mechanic28

iTrader: (5)

you would push a 205 block too on standard c/r?? from experience you peeps might of had from here?? on a 2wd by the way!

JRST

wouldnt push more than 400

dovboy

no more then late 300's imo.

BigErn

As much as I possibly could.

380ish should be safe enough Id have thought

bud-weis

430bhp....now running slightly more power ( but less torque ) in the hands of its new owner.

a 205 block in a 2wd car will be fine IME ( never had a 200 blocked engine, and all of my cosworths have seen plenty of hard driving ).

From my time owning fords i've heard many more 200 blocks fail than 205's anyhow.

i'd say push it to 500bhp, if it fails then swap the bits over to a new block....but i bet it wouldn't if built properly!

Jim Green

LOL......I'm sure Karl won't answer this thread, as over the years it's ended in so many arguments.

There is a theory.........that the 205 block was cast using better quality material than the 200 block .......... and I think my old saph (Now in the hands of Maxest), is probably one of the biggest output 205 blocked cars, now verging on 450bhp. Only time will tell, but it was built up on a mint 205 block with low milage, and assembled by Karl (NMS). I know when I had it, it didn't get used much, but when it did, I wasn't easy on the horses. CR is not standard though.....It's 7.4:1cr

And as mentioned by Martin......I too have seen/am aware of more cracked 200 blocks than I have 205's.

Dicko&Vacant

iTrader: (3)

my old 205 block with standard comp and pistons etc made 403 and ran fine for 3 years

Butch.

iTrader: (1)

My old 4x4 saph was on a turbo technics t38 running 34psi live mapped by stu at msd and that was around 440 bhp and i raised the comp to 8.3

The DIVA

iTrader: (3)

I`ve run a few 205 blocked motors over 400 Bhp and i know Tony Mannock and Karl Norris have both built many big power 205 motors without any issues....

robertthorpe

my mates running 438bhp on 205 standard crank running 25psi,
another mate running about 520bhp on standard crank but irt s been lightened and balcenced he is running 23psi and they aint shy of using that power!!!!! lets just say the cars are driven hard and they have never had trouble!!!!!

Shorty

iTrader: (1)

Lee Cattermole uses or has used 205 blocks in the past at over 500bhp.

Also, Jonno (Nutter) uses a 205 block on his 500bhp car.

So dont know why people are saying dont push them no further than high 300's.

peteh

iTrader: (3)

well said that man

Jay,

iTrader: (4)

and brom run 500+ out of a205 and loads more people did years ago its all in the preperation and maintenance

BigErn

Its a common theory/misconception that the 205 can only take say up to 400bhp without problems and that is what a lot of people base their reply on if they have no first hand experience of running more on a 205 without problems.

Personally Id be happy to run 500bhp+ and if it goes it goes, just change the block. I know of a 205 block being ran at 500+ and it was fine, he now has droped it to stage3 as its more fun to play with on the roads and it gets nothing but abuse and copes just fine.
As said above theres a lot more 200 blocks being heard of with problems at the minute than 205's. Its just personal preference really, I suppose some people use the 200 for piece of mind.

mechanic28

iTrader: (5)

hmm!so whagt os the main differences between the two blocks then?why are the 200 blocks more stronger?i sem to remember its something like the casting around the bell housing is thicker?and the position of the water jackets around the liners are different?

Jay,

iTrader: (4)

the waist on a 200 is thicker this is what people drill into to able long studs

mechanic28

iTrader: (5)

is that it??

Jay,

iTrader: (4)

well as far as cosworth are concerned when i asked them

dumped

as one example a 205 block in my car vapourised at 460ish flywheel. But thats just one experience, read into it what you wish

mechanic28

iTrader: (5)

thats interesting

Karl

I've been asked this many times so here goes....................

200 blocks have several differences to a 205, but the three most important that give considerable increase in strength/improvement are:

1. Extra thickness to the bore tube up to half bore tube height. The bore tubes are also siamesed together unlike the 205 block.

2. Full height cast in pillars for no.3 pair of head bolts. This means the land into which no.3 pair of head bolts screw, is a full height cast internal pillar, adding considerable strength to the deck face, and is why long studding is NOT necessary.

3. At the base of the water jacket are 10 square cast bosses which allow the block to be 10 studded if required. (This process I carry out only when block cracking is an issue around no.2 or no.4 head bolt pairs. However from experience the block cracking issue around no.2 and no.4 pair of head bolts is actually a heat issue, and often associated with head gasket failure. It is NOT the daft misconception that the head lifting cracks the block due to using head bolts!

Other minor mods to the 200 block vary depending upon year of 200 block and include: (years are approx as I'm sure the exact date varies)

Deletion of rear core plug (1992 onwards) Designated V90HM 6015 AB (pre 92 blocks are V90HM6015AA)
Deletion of mechanical fuel pump drive machining (1994 onwards)
4 Additional internal bosses inside crank case for machining of internal piston cooling jets as used on EECIV escos (1992 onwards)
Use of larger size main bearing caps over early 205 blocks though these are also found on late 205 locks.

That folks covers all the significant changes to a 200 block and is as you can see quite significant. It does however not mean that 205 blocks are no use, simply that the 200 block is in design at least, a stronger block.

Jim Green

The king has spoken...........

There's your answer then guys.