EricYellow

Anybody got an idea about the max bhp you can get out of a 205 block ?
Assuming it has a flowed head, GT30R, cams, RS500 IC, +0.25mm forged pistons etc...
What's the most anyone's ever got out of a 205 block ?
400 ??
450 ??

lawnsy

iTrader: (1)

you can get the same power out of a 205 block than a 200 block its just how long it will last as they are not as strong.....

Deano

I ran 500 in mine and didnt have a problem with it

bud-weis

As said above the block gives no difference in power...

GT30R doesn't tell us much about the turbo spec so it's hard to say what your power would be..

I have had long chats about the 205 block.....for the record i have a 205 in mine,currently running with no probs at over 420bhp, soon to be running over 450bhp, i expect no problems from the block at all tbh..

peteh

iTrader: (3)

my 205 will be 450bhp no problems as long as it's built and spec'd right

EricYellow

That's why I asked, how much can you get out of it reliably....?
How much can the block itself handle ?

ps. th GT30's spec's are good for max 500-525 bhp

bud-weis

tbh i personally don't think the block would be a problem. The production 200 blocks themselves aren't exactly special, i mean i bet you've seen just as many if not more cracked 200 blocks

the only thing i will say is that a 205 block in a 4wd car would probably not handle that power...the 200 block was strengthened to deal with the extra forces/stresses of the 4wd system,

best bet if your worried is to go for a new motorsport 200 block if you can find one!!

but at worst if your 205 block does break, it'd just be a case of swapping the bits into a different block, it's not as if it'd explode and damage the whole bottom end!!

lawnsy

iTrader: (1)

personaly i do not think there is a set bhp were the block will fail as i have seen a 200 block fail at 350bhp......

id be quite happy running 450 or more through a 205 block

Nash

iTrader: (3)

Like bud-weis is running i have a 205 block and should be running 420bhp+ very soon.

I have a another 205 block in the pipe line up with correct bore. If it cracks it cracks, i will just build it up into that one.

gingerturbo

iTrader: (2)

dan from abc motorsport built my m8's engine and he can wined it up to 400break and thats only a 205 block, and its as tough as nails

Dicko&Vacant

iTrader: (3)

mines running just over 400 on a 205 block with no probs at all

lawnsy

iTrader: (1)

nope blocks ok ....just the head.....

thought id get it in before some one else does

Dicko&Vacant

iTrader: (3)

ha fookin ha thought id copy off you lol
you will have to get to one of our group meets now ya car is back on the road

xr4x4rs

iTrader: (5)

well i ll be happy if i get 360 out of mine

i know its not a lot but its 4wd and from what mike said the other day i dont really want to be doing regular launches as it wont last

Dan

Good thread I was chatting about this on the phone to my mate last night funnily enough...

I thought the max power from a 205 was 400 ish, but you learn something everyday!

Danny @ Enhanced Performance

iTrader: (3)

your not limited to power just cos its a 205 block its just a fact that if you run lots of boost and spark through a 205 block or a non studded 200 block for that matter that it will crack round the stud holes therefore causing you lots of grief building up a new engine so dont fuck about in the beginning and just get a grpa long studded block and you wont have grief.as for saying the 200 block was desighned for the 4b4 due to extra running gear thats bollox alot of the early 1990 4b4 had 205 blocks

Cossie92

Old thread but I have a question. Are 200 and 205 blocks equal in strength and reliability at same power, with both using standard headbolts? I remember reading that 200 blocks also came with better casting than 205 block, so is the 200 block better in other ways than the possibility of machining longer studs?

Jay,

iTrader: (4)

Well the bottom half is thicker so the 200 block wont twist as much and some say its a bett all over cast than the 205 block but they all crack in the same places across the head bolt holes on standard bolts but imo thats down to prep when replacing the headbolts and not cleaning the threads out properly

Cossie92

How much does it generally cost to machine 6 or 10 long studs to 200 block?

e: I found out RB motorsport quotes 100-160 pounds.

Chip

iTrader: (3)

Dont forget all 200 blocks are NOT equal either, while an original 200 would by my preference, I think if that wasnt an option then I would sooner an original 205 block than a turkish 200 one TBH

james kiely

iTrader: (5)

i am always intrigued by the filling with concrete trick to increase rigidty in cossie blocks ,by our north european neighbours .

anyone in theuk ever used this mehod?

Harryh24

iTrader: (1)

I spoke to Harvey Gibbs about this as I've got a 205 block 2wd head, and he said power your not limited to but he wouldn't bother putting any sort of power through it, as it won't last and would be a lot of wasted money, do I it once and do it right.

Cossie92

Yes there are some swedish and finnish Cosworth's using 205 blocks with concrete. In theory, it should add quite a bit of rigidity but I don't know how much in practise because you still have to have some room for the water. I recall some of these concrete blocks running around 400-600 bhp, but then again, there are also std 205 blocks with those power levels and some of them have been running with no problems.