1.8T 20v head + MK4 2.0L AEG, AZG, and newer block (NOT ABA, NOT 9A, NOT G60, etc)
I know there's several threads (and one really big one) on the subject
of 20/20 conversion. However, 98% of that only centers around pre MK4 motors.
One of the biggest difference MK4 motors DO NOT require plugging
any oil drain holes in the 20v head (among other differences).
I'd like to consolidate the MK4 conversion info into this thread.
This swap should be alot easier and shouldn't have all the extra
details associated with older motor conversions confusing others researching this conversion.
I'll post later with any MK4 specific info from the big 20v thread and all the info I have on this subject.
edit: Let me start off with this:
The biggest problem that we have to get past which will convince 99%
of you just starting research NOT to go through with it is this....
you CAN NOT use the stock 2.0L pistons as they are. The stock pistons
will NOT clear the middle intake valve on the
20v head (at least not with safe tolerance). You have 2 choices:
1) modify the stock pistons by machining a notch relief to clear the valve
2) buy custom pistons
I won't get into reasons for going with either now, BUT either choice REQUIRES
removing the pistons from the block. This also involves at least prep honing
the cylinders and new pistons rings that you need to properly gap.
LIST OF MEMBERS THAT HAVE DONE THIS SWAP:
Modified by elRey at 3:03 PM 2-25-2010