Hello,

we have tuned friends YB sierra, but after few runs engine starts to pressurize coolant until it blew from coolant tank. No overheating or pressurizing on crusing. We dissasamble engine. Found 205 block has usual crank around cylinder bolt between 1-2 cyl and partialy on 3-4 too.
But blew track on gasket is on oposite side of engine on cylinder no. 4.
Gasket is not burn, metal is like new, but black nylon sealant from gasket is blew away. We found, that there is not much made on gasket for solid pretension around cylinder.
Used OEM headbolds, tighten 120nm on assembly and checked 120nm on dissasembly. Around 5000km on gasket(overall on 1.1bar 340ps, now last 500km tuned on 2.0bar at 450+).

So my opinion is, that cranked blok doesnt have influence on gasket sealing(cylinders), isnt?

So may we change block(need reboring, simply almost whole build again) for non cracked + WRC gasket?

Or ghetto style, wireringed actual block(engine is out of car now) + YB1261 ?

 

If its cracked around the bolt holes then you run the risk of a water way being cracked and the chance of water mixing with the oil so I wouldn't wire ring it!!

An engine I bought years ago had similar issue, wouldn't run very well and checked the oil Nd was milky, changed it and checked again was the same.

When I stripped it was cracked round 3 bolt holes and also had a cometic HG!!!

 

But only way how can mix water with oil, is throught headbolt, from the top of the head. Around bolt is still just water. Also OEM gasket seal better around water ect, especialy if there is a crack = potential movement/deformation of material.

We dont want to cheat something, but if we decide to build new block, it means whole car season will be gone this year

 

im no pro but I think your block is no good,if its cracked between bolt holes oil water ways.its a lottery with a 205 block around that power level
mark

 

Mechanic decided to throw cracked block away, so engine being stripped down. Uncracked 205block bought, 200 is unreal to get in our noncosworth country

Do anybody have detailed photo of WRC gasket, how well is designed around cylinder bores?
Also there are a few manufacturers of WRC, any differences?

 

Don't have any detailed pics but I got this one for mine when I rebuilt it, made by victor reinz who also make the group a head gaskets!!

http://bit.ly/13qH7aX

200 blocks are getting hard to get hold of in general now sadly as most get them when the 205s fail

 

if I was you I would consider lowering your bhp level to around 400 bhp max otherwise your risking another 205 block going to the bin and at this level you can use a grp a gasket ,this way you can keep as much meat as possible on block and head. this is what I would do but the choice is your

 

Could you not go cooper ringed gasket??

 

Thanks for your opinions.

Reinz WRC looks the same design as cometic, but can be differend on inside layer, therefore some hires personal photo welcomed

There are peoples on this forum running 500+ on 205block, so there must be solution or simply more luck I searched a lot here about cracking ect.

Copper ring gasket means spesso? Expensive as hell, but in actual situation is in consideration also.
But now im in thinking about WRC + little pretension by copper wire ringed block.
Is there any guide how other wire ringing - O ringing the block?

 

I remember reading somewhere that a small turbo escort cossie head gasket is the best to use ? I had a metal multilayer head gasket on a previous cossie and it didn't last long so changed it to small turbo one and had no probs. I have always used these since without problem. Don't know why the escos one was suggested though ??

 

Copper ring gasket, xpower engines Essex, I paid Ł150 for mine as opposed to Ł400 from others, and mines fine as anything, so not much off a WRC gasket money, comes with instructions of how to machine block for the rings, any machine shop can do it cheaply.

And they're are superb on standard head bolts as thats what I'm running, and mine was a proven 500bhp engine.

 

Small turbo is Y1261, isnt?

Oh, i know xpower, engine have hiflow oil pump, bearings and few other small engine pieces. I will contact him, thanks!

 

Cometic gaskets are fine, but everything else has to be perfect for them to work. Have the head and block both been faced to a suitable finish? perhaps the cracks may affect it, as there is no 'give' in them like conventional fibre gaskets.

 

Block was skimmed in shiny finnish, head was maybe little more rought, but still shiny. As i wrote, cracks are on opposite side of main leak area.
Becouse i found bad comments about cometic(on evos ect...), then im in doubt of quality of product itself.

 

Cheapest for engine parts, and ex mountune engineer, so knows his stuff.

Ask for piero for the best prices.