FormulaZR

Thanks, can I find him on here? Also, anyone know if EA81 and EA71 cams interchange?

Got the PM, thanks. For the first "incarnation" of this I will be using EA71 stock heads, just to see. My first two steps are going to be some head work, and a cam from Delta. I'm going to start small and work up from there if the results don't suit me... Are there any gains from using 1400 heads? If so, what are they and where did they come from? IE: better casting, or small combustion chamber, etc? Side note, and I really need some info on this: Does anyone have any information on milling heads. IE: How much can I mill? My goal is 9.2-9.5:1 compression...but I'm wondering how much that takes and if I will have any PTV issues. Also...are there thinner head gaskets available for this engine that will reduce the amount of milling required. Thanks again, Zach

Sorry for the stupid question, but I'm having trouble reading that graph due to english vs japanese measurements. Does anyone have these dyno charts with HP and Ft/Lbs? Besides, horsepower is relative...I'm looking at that torque peak around 3500. I'm going for thrust, not a fast spinning prop.

Thanks guys...part of my "problem" is that my application is somewhat weight critical. All of the auto engines converted to aero use are a compromise....but it's worth it to me for what I'm doing. In stock form the EA71 will do what I need, just not quite what I want. Ideally I'd use a turbo'd EA81, but the added weight of the 81 vs 71 plus the turbo just puts me out of the weight spectrum I can handle. I've read a little about using EA63 heads on the EA71, does this offer any gains? Also...I am wanting to mill the heads a little bit to bump the compression, does anyone know the "max" they can be milled and keep the engine happy? I could, in theory, turn the engine up higher...up to 3800 with direct drive, or higher with a reduction drive, but I really don't want the weight of a re-drive.

First, I'll introduce myself as this is my first post on these forums. I'm from West Texas and a total gearhead. I'm not really a Subie guy by nature...but I have a couple engines that I will be building up for experimental aircraft use. I'm pretty new with these engines, so take it easy with me if I use wrong terminology or state the obvious please! Currently I am mounting an EA71 to a V-max experimental. It has a single carb and 1 intake port per head. So here's the questions: 1) The intake manifold doesn't appear to be a great design for power, what is the best intake...or intake design...for max power between 2400-3400 rpm? 2) Does anyone have any real world experience regarding head work results on this engine? 3) Who makes cams for these engines, and what would be the best grind for 2400-3400 rpm? 4) Are the pistons forged or cast? 5) What is the highest (up to 10:1) compression that these engines will safely and reliably run with, and who makes the pistons to bump the compression? Or...do you just mill the heads? 6) Are they any tips you guys can give me to help me get the most out of this engine reliably? 7) All the above questions for an EA81 (for a future engine swap). If I left any important details out, please let me know and I'll provide as much info as I can! Also, I do have both an EA71 and EA81 currently, so I'm ready to start experimenting. Thanks, Zach