engine blocks

[richard gleason]

Your correct about availability ,last year i could only get.20 over not .40 in 9.0 .My engine builder said to be legal not to use 10.0 .Did he read that wrong?(update/backdate)!? At least i can bore it again ,unless i vent the block.

[Lael Cleland]

We have a .5 comp increase & 1.2mm over bore......Ya try and find any cast vw pistons 1mm over!!!! I have never seen them....in 20 years....there is few .25mm(.010)& lots of .50mm(.025in)
In a MK2 golf 8v if you have all the GTI stuff(rear disk), you can run 10.5:1 comp......If you have drums its 8.5:1..????.....????? may be a few more differences....Vented front rotors???? 9A gear box....

[Ralf]

My Golf GT came with non vented front brakes and rear drums but with the 10:1 RD engine and 9A tranny. According to the car classification, GTI, GT and GL are all on the same line allowing 10:1 compression.

[Lael Cleland]

WAHOO!!!!! 10.5:1 after the race is allowable!Are you running solid rotors now? I heard Hawk quit making pads......

[Sandro]

Bildon sells 1mm over Pistons:

http://www.bildon.com/catalog/Detail...av=6&SubNav=62

[Ralf]

WAHOO!!!!! 10.5:1 after the race is allowable!Are you running solid rotors now? I heard Hawk quit making pads......

No way. I have had vented rotors in there since '88. They are a direct fit.

[Ralf]

Last night I did some reading in the ITCS and in 9.1.3 para C it states:

Any updated/backdated components shall be substituted as a complete
assembly (engine long block, transmission/transaxle, induction system,
differential/axle housing). No interchange of parts between assemblies
is permitted, and all parts of an assembly shall be as originally produced
for that assembly (such parts may, however, be coated, painted or

plated).


So, it doesn't sound like one can just swap in higher compression pistons if such block didn't come with 10:1 compression. Am I reading that right?

[shwah]

You can update back date between all years on a given spec line. The ITB Golf 1985-1992 spec line includes 10:1 cars. Yes you can use a 10:1 motor. The engine blocks are the same, the difference is the pistons. You are not creating anything that does not already exist within that spec line.