junk250 Posted October 11, 2014 Share Posted October 11, 2014 (edited) From WIKI , EA-71 The Subaru EA-71 engine was produced from 1976 to 1994, and was a redesign of the EA-63 block. Sales in the US ended in 1987. Subaru EA-71 Engine Specifications Displacement: 1595 cc Bore: 92 mm Stroke: 60 mm Compression Ratio: 9.0:1 Valvetrain: OHV Pushrod Horsepower: EA-71The Subaru EA-71 engine was produced from 1976 to 1994, and was a redesign of the EA-63 block. Sales in the US ended in 1987. Subaru EA-71 Engine Specifications Displacement: 1595 cc Bore: 92 mm Stroke: 60 mm Compression Ratio: 9.0:1 Valvetrain: OHV Pushrod Horsepower: Horsepower Horsepower:1976-1979: 67 bhp (50 kW; 68 PS) at 5,200 rpm (US) 82 PS (60 kW) at 5,600 rpm (JDM, emissions cleaned) 95 PS (70 kW) at 6,400 rpm (JDM twin-carb, emissions cleaned) 87 PS (64 kW) at 5,600 rpm (JDM, no emissions equipment) 1980-1987: 68 bhp (51 kW; 69 PS) at 4,800 rpm (US) ************************************************************************* It seems the standard US EA-71 is 67 bhp. The "JDM emissions cleaned" is 82 bhp. "JDM no emissions" is 87 bhp. Thats nearly 20% increase in HP by no emissions ! Can you make a US EA-71 "no emissions" and 87 bhp, and how exactly ? Thanks Chris Edited October 11, 2014 by junk250 Link to comment Share on other sites More sharing options...
Leeroy Posted October 11, 2014 Share Posted October 11, 2014 Firstly I would not put any faith in the accuracy of Wikipedia entries! Secondly there are two different measurements for horsepower being used, BHP and PS and lastly the Japanese used to list the power figures at the flywheel rather than will all the accessories fitted (such as fans, alternator and so on). Having stated all that it does appear the JDM EA71 had 10 kW more than the US version... Link to comment Share on other sites More sharing options...
Datsunrides Posted October 11, 2014 Share Posted October 11, 2014 Generally, on these 70's US cars, the power power rating is more due to lowered compression, leaned out / smaller carbs and mild cams to meet smog laws. Take a US motor, up the compression a bit, add in a hotter cam and add a weber and you will probably get at least another 10 hp. I'm with Leeroy in that I doubt the JDM motors put out 20 more HP than the US version unless maybe with the dual carbs. Those numbers are probably due to the different test procedure between JIS and SAE. Link to comment Share on other sites More sharing options...
junk250 Posted October 12, 2014 Author Share Posted October 12, 2014 (edited) Firstly I would not put any faith in the accuracy of Wikipedia entries! Secondly there are two different measurements for horsepower being used, BHP and PS and lastly the Japanese used to list the power figures at the flywheel rather than will all the accessories fitted (such as fans, alternator and so on). Having stated all that it does appear the JDM EA71 had 10 kW more than the US version... Leeroy, Thanks, yes I noticed the different rating system PS vs bhp. WIKI, yea I know. But if the numbers are correct, they are all rated in PS and compare those ratings. So I did a little math. US version rated.............. 68 PS emissoins cleaned JPM....82 PS That's a 20% increase over US Version. no emissions JPM.............87 PS That's a 27 % increase over US version ! and the dual carb JPM .....95 PS That's a 39% increase over US version I wonder what the difference is between "Emissions Cleaned" and "No Emissions". Best, Chris Edited October 12, 2014 by junk250 Link to comment Share on other sites More sharing options...
junk250 Posted October 12, 2014 Author Share Posted October 12, 2014 (edited) Generally, on these 70's US cars, the power power rating is more due to lowered compression, leaned out / smaller carbs and mild cams to meet smog laws. Take a US motor, up the compression a bit, add in a hotter cam and add a weber and you will probably get at least another 10 hp. I'm with Leeroy in that I doubt the JDM motors put out 20 more HP than the US version unless maybe with the dual carbs. Those numbers are probably due to the different test procedure between JIS and SAE. Hey Datsunrides, I miss my 76' B-210 5 sp Coupe, I called it the "road warrior " it would burn a tire in 4th gear . Back to the Subaru EA71, Not 20 HP increase, but 20% increase. When you start from 67 Hp/JP, 82 HP/JP would be a nice improvement,maybe remove a whole lot of emission stuff I don't need? Best, Chris Edited October 12, 2014 by junk250 Link to comment Share on other sites More sharing options...
Peter Posted November 6, 2014 Share Posted November 6, 2014 So I have a 79 EA-71 What emissions can I get rid of and still make the engine OK ? The air suction system, the EGR, do these sbsolutely need to be there? Link to comment Share on other sites More sharing options...
djcommie Posted November 7, 2014 Share Posted November 7, 2014 AIr suction system can be removed, EGR too. EGR actually lowers pumping losses and doesn't really remove any power from the engine. Link to comment Share on other sites More sharing options...
-tombba- Posted November 8, 2014 Share Posted November 8, 2014 (edited) Just to mix things up more my -88 leone coupe has EA71 engine in it and all of our third gen EA71 1.6 engines are supposed to be 54kW. I assume the difference comes from timing advance settings and higher octane fuel or something similar. Difference in the Japanese engine can also come from more timing advance due to higher octane fuel. Edited November 9, 2014 by -tombba- 1 Link to comment Share on other sites More sharing options...
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