Quote, originally posted by Kougaiji » Elrey. How would one take advantage of increased flow from the 20v head on an NA car? I know that Nate's record-breaking NA 2020 dub obviously uses the 20v head, but what engine mods take advantage of the lower CR?
With everything else that's involved with flow:
and then software
don't hold me to it, but I think I read that the 20v head flow ~20% more that 8v head on a flow bench.
20v intake and TB shouldn't do anything to lower that increase.
However, using the stock 20v exhaust mani coupled to 8v downpipe
might lower that ~20% flow increase on the bench.
Hypothetical, let's say your gain ~12% increase flow with all stock 20v stuff. You've lowered you CR to ~8.4:1.
The loss in CR will over shadow your gain in flow.
20v NA application wouldn't be worth it without custom pistons.
VW did make a 20v 2.0L NA engine ove the pond, but those pistons
are hard to get a hold of. A set was for sell on here a while ago.
edit: found them: NA 20v pistons
Modified by elRey at 6:13 PM 7-8-2006