Anyone useing two head gaskets.

[Avantus]

Up to what hp levels is the stock 9.1 RS2 CR safe?

[A80Avant]

the hp levels may not have much to do with it. More compression, you run less timing, but may get good hp numbers regardless. im told that more compression will give faster spool and better response off boost. Knock will be a limitation though. Having said that, newer audi turbocharged engines have 11:1 compression (sure FSI may have something to do with it) and yet get big turbo mods and run 1.8bar happily

[Avantus]

So stock CR with up to 430-450hp is still safe then.

thanks

[A80Avant]

i was running on roughly 9:1 up to 470-490 with the 3076r and 2bar without knock.

[220bhp]

There must be a few heads around that are below the minimum given the age of theses cars and the fact that most people skim the head when they take them of. Head gasket failur is more likely now the cars are getting older.

[Avantus]

i was running on roughly 9:1 up to 470-490 with the 3076r and 2bar without knock.

Nice!

[Thuppu]

Many people run 500-600hp with stock CR.

[QuattroFever]

hammer and shed way to check valve to piston clearance -> a piece of wire down the spark plug hole, into the recess area and crank it by hand then measure the thickness.

[220bhp]

I thank you all for your replys, and it seems to me that my problem is not so much cr but this minimum head measerment. This is the crushal thing,and the answer I cannot find.
RWD19t,I can't thank you enough for your quick replys,and I understand what you meen about the I5 being a none tolerrance engine, and I fear you may be right,but I still cannot find Audi,s reason for stateing this minimum measurement,yet not telling us why.
Someone must know how to find the answer
In the mean time thanks for the help I realy need it, just seems its one brick wall after another at the moment,quite easy to lose the faith right now.

[s2martyn]

what you are trying to do is a very technical job,if you caNt use a plastigauge set then you will not get the definative answer you need..only an experet can do this for you..
i wouldnt skim the block

[220bhp]

The block has already been done.I am getting the engine balanced and put together by
Alred and hopfully he will be able to sort my problems.

[JP]

When assembling any engine a builder will check block holes bolt lengths and head thickness. To ensure the headbolts don't bottom out. If they do run studs problem solved.

As for valve to piston clearance this should be no less than 1.5mm at tdc with headgasket compressed. Again an experienced builder will know how to check this. So in the grand scheme of things if the valve piston clearance is good and you are running studs then you have no issues.

Normally if someone is running adjustable timing pulleys you would also check at what cam degrees the valves go below the 1.5mm clearance so you know where your limits are when dialing in the cams.

Hth

[220bhp]

Many thanks

[A80Avant]

valuable info there! thanks