Seems all the bigger piston and cylinder kits on AA or EMW is geared towards the 2.0 based motors with the longer stroke.
Is there a reason for this besides people just wanting to maximize the CC of their motor build money?
Very good question. I await the answer.
The cases are all the same. As long as it is good condition you can start with a 1.7, 1.8 or 2.0.
IIRC Jake said he likes the 1.7 cases because they have had an easier life. I'm not qouteing him, but something like that.
2.0's have a longer crank (71 vs 66mm)but if you want more than 71mm stroke, you're replaceing it anyway. Otherwise it's just P's&C's, head work, exhaust, wideband...
Bigger cylinders have sealing issues.
LN will make a piston with any pin height that you desire.
I have a 69X106.3 combo that works great using the 17/1800 rod length ands I have also done this with a factory 66 stroke crank, using the 105.07mm bore size.
Head sealing is an issue when using cylinders and hardware outside the Nickies line up.
In general I prefer stroke over bore hen increasing displacement.
Not much of interest in short stroke for these engines would be my guess.
the one engine build that still really intrigues me is the 78mm stroke with the 90.5mm bore. a torquey gas mizer
this was the basis for Jakes super two liter,
Dilemma - I'm in the process of tearing my wife's 1.7L D-jet motor apart for a rebuild. At first, I was going to rebuild what was in there - bone stock.
Recently, I've thought about going a little bigger, but want to keep the existing FI system pretty much as is and keep the car fairly reliable (whatever that means, being a 914)
If the 66mm crank and rods check out OK, maybe just a little increase with 94mm P&Cs and a little more aggressive cam. Is this a wise choice? … and an experienced FI guru can list any pitfalls I may encounter?
You will need to do head work on those heads, or do yourself a favor and get new AMC castings for the 1.8 heads and port design.
Then get a set of 96mm pistons and cylinders from EMW...
Simple build
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