peteh

iTrader: (3)

it has only been rebuild once, just looked again and it was a con-rod that let go, must have grooved the bore well inside then if it's rebored to +1mm

where's mr norris when you need him

peteh

iTrader: (3)

bttt so stage 3 would be safe then?

JRST

after reading the post. Seems to be fine. i dont know though. i think we need the input of the turners really.

Ian2wdsaffcos

Good point

Ian2wdsaffcos

Very difficult to say, it's all a gamble really, the block in my first Saff cracked right down one of the bores not long after I'd sold it & that was running stg3 on 0.5mm o/s pistons with 205block. Although it had done about 50k on the rebuild.

Ian M

absolutely ive seen more 200 blocks cracked than 205 although thats usually down to poor preparation of the block before assembly.

Rene

boost mad thanks for clearing that up mate and i know Burton supplies the correct pistons for that as i was looking into this

LPS

I was running 92mm accralite pistons in my 205 block at about 400bhp and it did about 5000 miles before it cracked number 2 bore (about 3inchs) and started to misfire but it did not explode . I'm running a 202 trany block at the moment see how long that lasts!!!!

markk

iTrader: (2)

totally agree there !!

what alot of people fail to remember is how old is your 205 block ?
and not only the age but what is it like internally as blocks corrode from the inside out especially when used without an anticorrosion device !

i prefer to use the 205 blocks for a few reasons of my choice , but they have to be carefully selected !!

peteh

iTrader: (3)

so not much use to me then as i wasn't there when they rebuild it , it was the old block that they rebored +1mm if that helps.

ImaRacing 700

..

brad

my 1st 205 was cracked but im certain at was cracked b4 it was rebuilt and no one noticed it
the 2nd one i had was fine , i used to run 38 psi peak and hold 32 iirc with no problems at all
luck of the draw me thinks , you win some you lose some ,

peteh

iTrader: (3)

markk

iTrader: (2)

the condition of the block can be determined by someone who knows what there looking for ( generally ) ive seen blocks that have had hairline fractures in them after a rebore that have gone unnoticed until the car has been run

this is why a new block will be specified for all high power customer rebuilds , as was said above its a reliability thing. alot of my work is done for me in the name of research and development , but would i always sell it to a customer , no is the answer, unless the risks are accepted by the paying customer, to me you are going to have to take that risk that whoever built that engine knew what they were doing and hope its ok

brad

its funny phil mentioned using liners , as thats what the engineering company who got my replacement block ready use put in mine .
i allways thought they were a bad idea till i posted about it on here and found out they can be a good thing if done properly

markk

iTrader: (2)

ive no problem with liners if they are done properly !!

Ian M

as markk says if it has allways had plenty of anti freeze in it should be ok internally you could allways take your water pump off and have a look that will give you a good idea.

Rs Gus

iTrader: (2)

and hes also alot higher than std comp and not even cossie pistons

Rs Gus

iTrader: (2)

yeah nearest transit van

Ian M

i hope your not suggesting he,s a cheapskate

PGT

fiona wanted to seee dancing men

markk

iTrader: (2)

yep - 2.5Di pistons machined down swirl chambers removed, and re welded crowns work mint !!!

pugo

I spoke to one of rouse's old engine men when i built mine and when i asked how much power a 205 block could take he told me because of the way cast has to settle he would prefer using an old crack tested 205 block in favour of an unsettled 200 block
he said when they were 1st racing they used to bin the new 205 cossie block and used to hunt breakers yards down to find any old 205 blocks that had had done at least 50k as they had had plenty of heat cycles and had settled , he said they even favoured them over the 500 blocks until they had done milage on them!

I currently use a 205 block and hold 30psi and its as happy as a pig in shite

Pugo
PS they were all on std bore though

Ian M

not having it, not even you would do that.


then again

peteh

iTrader: (3)

got my hopes up then , i've been told the 200 block being stronger is all a mith anyway from someone who was whilling to buy a brand new 'stronger' 200 block from a very very well known rally engine builder then told to keep his money as they are not weaker, only in a certain place which will never break on a road car, or something like that anyway

Ian M

i wouldnt worry about it even if you ran greys you wont put anywhere near the amount of strain on it that a race car would.

Rs Gus

iTrader: (2)

markk they dont even know the bore size lol and its more than 1mm over

markk

iTrader: (2)

now dont be silly gus you and i know you cant run a block at more than 1mm over for competition use

Rs Gus

iTrader: (2)