breaffyaviation Posted May 26, 2005 Share Posted May 26, 2005 Hi everyone again,and I have a question.I was always under the impression that a stock EA 81 produced its best power in the 4000 rpm to 4800 rpm. range.However I was reading an article which suggested this engine produced more power at 2800 .Can this be right.?Without mods? Thank you in anticipation . Jude Link to comment Share on other sites More sharing options...
Ross Posted May 26, 2005 Share Posted May 26, 2005 Hi everyone again,and I have a question.I was always under the impression that a stock EA 81 produced its best power in the 4000 rpm to 4800 rpm. range.However I was reading an article which suggested this engine produced more power at 2800 .Can this be right.?Without mods? Thank you in anticipation .Jude Sounds odd. I know some ea81s got thier most torque at 2800rpm. Link to comment Share on other sites More sharing options...
Ratty2Austin Posted May 26, 2005 Share Posted May 26, 2005 torq sounds about right... the advertised peak HP rating for the old subarus, EA81 and EA82, was usually at like... 5200 rpms.. (like when advertised by subaru) anyone run a dyno on a stock EA81? Link to comment Share on other sites More sharing options...
Alex C Posted May 26, 2005 Share Posted May 26, 2005 From what knowledge I have gain the peak torque is around 2800, and the peak HP at the 4000+ range. The motor also starts to really pull above 3500RPM. Also, as stated elsewhere on this site, it cruises nicely at 4000 RPM for many hours at a time. Alex Link to comment Share on other sites More sharing options...
archemitis Posted May 26, 2005 Share Posted May 26, 2005 i've done 4500 rpms in a solid lifter brat from mn to texas (14 hours minimum) several times. Link to comment Share on other sites More sharing options...
Phizinza Posted May 26, 2005 Share Posted May 26, 2005 these little guys (ea81s) are as tough as wallnuts.. (what ever that means) I get most hp after about 3200rpm, but my brat pulls a little harder then most... I've heard of a mod called distributer re curving, you can put the maximum power just about anywhere you want it with the mod i've heard... sounds very interesting... Link to comment Share on other sites More sharing options...
Alex C Posted May 26, 2005 Share Posted May 26, 2005 I agree with the long stretches of driving at high rpm, (baltimore to joliet, joliet to cheyenne, and cheyenne to ashland, with only stops for gas/food, and sleep the two times). What is this recurving? Can you show us how? Alex Link to comment Share on other sites More sharing options...
Phizinza Posted May 26, 2005 Share Posted May 26, 2005 well i found out about it on this forum. the guy said he doesn't know how to do it, but he said he takes it to a guy with a machine and he does it... I think it has something to do with changing the advance and making the spark quicker or soming. I would think you could also do this with a computer controlled CDI... but I really have no clue what so ever. Link to comment Share on other sites More sharing options...
NorthWet Posted May 26, 2005 Share Posted May 26, 2005 "Distributer recurving" is no magic elixer. All it means is that the ignition advance "curve(s)" is/are altered to better suit the particular way the engine is set up. Most advance curves (profiles) are set to be conservative, trading off possible performance/economy gains in exchange for not worrying about engine damaging detonation. The big "hot tip" I have seen here is to use an FWD distributor instead of a 4WD distributor, the 4WD one being setup with an eye towards the vehicle being used in less than optimum situations and under higher loads. Torque and power curves are controlled mostly by how much air an engine can breathe, where in the RPM range it does so most efficiently, and over how broad a range the majority of this efficiency occurs. Link to comment Share on other sites More sharing options...
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