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This is of great interest to me as it looks like I'll need to rebuild by stock 1600 this summer and am interested in building it as a 1679. Here's an old response I received when I asked a similar question. If I keep the stock FI setup is adjusting the fuel pressure the only adjustment needed? Thanks, Norman On 22 Feb 2003 at 1:27, Richard Steinburg wrote: > Just wondering, if you increase the displacement from 1584cc to 1678cc > while keeping the stock FI setup, won't you be running the engine a > little lean? How would the FI brain know you have increased the > displacement? The only thing I could think of doing is fooling the > brain by changing the injectors to ones with a bigger flow rate. I completely skipped over this earlier. Yes, you have to compensate the FI for the increased displacement. Take the ratio of you new displacement over the original 1594cc. Then either substitute injectors that have a higher flow rate in the same ratio, or increase the fuel pressure by that ratio. Since the flow rates for the various injectors are not published, it's easier, and a whole lot cheaper, to just increase the fuel pressure. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* -----Original Message----- From: wfoh8x9 Martinez-Ortiz [mailto:wfoh8x9@msn.com] I have seen this post before and would like to stir it up a little. Is that also true with carbureted engines and why would it be different changing the stroke and not the bore... > stock FI would handle 1776 no problem. But a 1776 will have about 30% > less > life and run hotter. > 1679 is the biggest you want to go and expect stock life out of it UNLESS > you get a stroker crank. > > Keith > > > > What is the maximum size of engine that the stock 70's FI would be > > happy with? I was thinking of perhaps a 1776 with standard size > > valves, stock exhaust and mostly stock everything else. Would the > > FI cope with that? > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org > > > > > > >