goobaroo Posted September 16, 2006 Share Posted September 16, 2006 does anybody know if any of the lightened pulleys made by unorthadox racing for newer subarus will fit the ea81 engine? if not where can i get one that will? Quote Link to comment Share on other sites More sharing options...
Phizinza Posted September 16, 2006 Share Posted September 16, 2006 You wouldn't be able to buy anything aftermarket/performance for an old EA81 surely? You might try looking up machine shop phone numbers and talking to them about custom lightweight pullys. Quote Link to comment Share on other sites More sharing options...
goobaroo Posted September 16, 2006 Author Share Posted September 16, 2006 yeah thats what i figured, but i was just wondering if there was some universal bolt pattern or pulley size for some other subaru engine that might be close enough to the ea81, but thanks anyway! Quote Link to comment Share on other sites More sharing options...
Myxalplyx Posted September 16, 2006 Share Posted September 16, 2006 yeah thats what i figured, but i was just wondering if there was some universal bolt pattern or pulley size for some other subaru engine that might be close enough to the ea81, but thanks anyway! Contact Garner on here! He was able to help me with my EA82T with a custom made pulley he made. Quote Link to comment Share on other sites More sharing options...
nkx Posted September 16, 2006 Share Posted September 16, 2006 Contact Garner on here! He was able to help me with my EA82T with a custom made pulley he made. how is that pulley holding up anyway?? i wouldnt mind a new pulley, seeing as i only use 1 belt now, and i want to get some weight off the crank. Quote Link to comment Share on other sites More sharing options...
goobaroo Posted September 16, 2006 Author Share Posted September 16, 2006 yeah it would be nice to lose some of that weight, even better if u can run a single belt, which i might do cuz my AC comp is shot, i think i'll just rip it out. unorthodox racing claims u can gain 2.7 hp for every pound lost! it might just be marketing, but who knows, it'll deff feel better. Quote Link to comment Share on other sites More sharing options...
NoahDL88 Posted September 16, 2006 Share Posted September 16, 2006 yeah it would be nice to lose some of that weight, even better if u can run a single belt, which i might do cuz my AC comp is shot, i think i'll just rip it out. unorthodox racing claims u can gain 2.7 hp for every pound lost! it might just be marketing, but who knows, it'll deff feel better. The pully will only save you maybe .25 pounds, so that would be a whopping .5 hp, at the crank, which would be nothing at the wheels. I hate to be the bad guy here, but you're starting with a car that has 72 horsepower, there is nothing that you can do to it, short of ponying up real money, to make it perform decent. Do a tune up, get good NGK plugs, the 1.49 dollar ones, there the best, gap em to .045 inch, which is a little bit more than the stock specs, get new wires, rotor and disty cap, and advance your timing to around 12 degrees BTDC, add a aftermarket ignition coil and you should have a more peppy feeling rig. When you're ready to spend real money, you can throw on a weber, which when tuned right will make your low end responce feel a lot better than stock. Good free flowing exhaust will help also, but a complete set from head to tail will be pricey, the aircraft guys go with 1 5/8ths from the head, and once they merge they go with 1 7/8ths, it maintains good driveability off idle but helps with top end. After all that, which will cost somewhere between 800-1200 bucks, you might top out at 90-100 horse power, and that is if the carb is tuned real well. The lightened pulley is the least of your problems. Quote Link to comment Share on other sites More sharing options...
goobaroo Posted September 16, 2006 Author Share Posted September 16, 2006 yeah i already have plans to do the wires, coil, and disty from a 2wd model (subiemech artical stuff) and im getting the new exhaust done next week, going with 2.25 cat back, possibly hollowing out the cat, dunno yet. also changing the thermostat to a 175 deg to keep things cool. i was just wondering about the pulley cuz i wasnt sure how heavy the stock was, and i might want a single pulley conversion soon. im not dishing out the cash for the carb cuz i like the gas milage i get now and i dont really want to lose that. thanks guys, great advice. Quote Link to comment Share on other sites More sharing options...
NorthWet Posted September 16, 2006 Share Posted September 16, 2006 Not-What-You-Asked: Light pulleys and flywheels do not "add" horsepower. They allow the engine to change speed more readily. Distance of mass from crank centerline is also involved, so a crank pulley is more "bling" than reality. Quote Link to comment Share on other sites More sharing options...
goobaroo Posted September 16, 2006 Author Share Posted September 16, 2006 ahhhhh....i see, thanks, i just reasoned that it was less mass for the engine to waste its energy moving, therefore that energy could be better applied to say the wheels... Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted September 16, 2006 Share Posted September 16, 2006 Mostly, light pulleys do some (not much, but *some*) good on engines that use a vibration dampening pulleys(heavy). The EA81 pulley is already very light. You would save virtually nothing in wieght, it would cost too much, and yeah.... just a wasted effort. Now if you were making a pulley for crank fired ignition, then you might as well try to make it light also. But that's a different scenario. GD Quote Link to comment Share on other sites More sharing options...
NoahDL88 Posted September 16, 2006 Share Posted September 16, 2006 going with 2.25 cat back Hope you don't really want low end torque, cause with exhaust that big your gonna loose it. Quote Link to comment Share on other sites More sharing options...
goobaroo Posted September 16, 2006 Author Share Posted September 16, 2006 should i go with a 2in? Quote Link to comment Share on other sites More sharing options...
testy Posted September 17, 2006 Share Posted September 17, 2006 I dont think theres enough gain for the price with those things. Quote Link to comment Share on other sites More sharing options...
Phizinza Posted September 17, 2006 Share Posted September 17, 2006 More free flowing your exahust is the less low end you have. It's really a question of do I want a offroader, or a street mobile... Compromises are almost pointless If you lighten the flywheel, which on EA81's are very heavy, you'll feel like to have more top end. It will ruin your torque and screw up your idle though. I would really love to do up a EA81 just for fun. But really, old subies are cheap, and the cheapest form of more power is a EJ. Somethings telling me to put that EJ22 in... Quote Link to comment Share on other sites More sharing options...
goobaroo Posted September 17, 2006 Author Share Posted September 17, 2006 does anyone sell lightened flywheels or do i have to lighten it myself? Quote Link to comment Share on other sites More sharing options...
Phizinza Posted September 17, 2006 Share Posted September 17, 2006 Normally what you do is take it to a mechanic/machine shop and get them to lighten and balance it. Although I don't know how much you would want to lighten it. If you take too much off the car won't run, and there may be a point where if you over work your clutch you can warp the flywheel from the heat. You'd get a new clutch at the same time, unless your on a real budget. I think it also messes with the timming, needing more advance? Quote Link to comment Share on other sites More sharing options...
goobaroo Posted September 17, 2006 Author Share Posted September 17, 2006 cool, i'll look into it, thanks man, clutch is relatively new, but i wouldnt lighten it too much, i dont want to totally screw up the engine Quote Link to comment Share on other sites More sharing options...
Phizinza Posted September 17, 2006 Share Posted September 17, 2006 Best thing to do is get a spare flywheel or two and prepare for a few flywheel changes while you get the best setup. Although it can be expencive to even balance a flywheel. Quote Link to comment Share on other sites More sharing options...
NorthWet Posted September 17, 2006 Share Posted September 17, 2006 Lightening engine rotating parts just changes how quickly the engine will change RPM... in a Subaru, that means mostly when blipping the throttle while out of gear. The power-to-weight ratio of Subarus will make it unlikely that you could measure any acceleration difference. (The engine might feel more lively, though.) As already mentioned, it will adversely effect (how much depends on how light) your idle and low speed smoothness, and can increase clutch issues (grabbing, chattering). It does not effect combustion, so no timing changes are needed. Lightening does not do any real world good UNLESS your engine's rotating masses are a significant total of your vehicle's inertia. BIG engine, light car, it makes a difference. Little engine, not-light car, almost no difference. Re: Exhaust - Nothing much matters after the first major obstruction/restriction in the exhaust path. Low-end torque will not be adversely effected by a too-large pipe following a cat or muffler. All the old lore about pipe diamater deals with a straight pipe, where exhaust pulses and flow are not interfered with by a muffler. Exhaust pulses are reflected/dampened by every change in tubing cross-section and or reflective obstruction, so they never make it past a cat or muffler (even glass-packs mangle the pulse). Keeping a pipe small past the cat/muffler just adds flow restriction, and is not needed for "extraction" purposes. Quote Link to comment Share on other sites More sharing options...
bratman2 Posted September 18, 2006 Share Posted September 18, 2006 The twin belt pulley is heavier on the EA81 than some people may think. I pulled mine and had a mechanic at work help me cut the front pulley off, we then drilled about 8 or so 1/4" holes with a drill press. Total weight reduction was app. 1 1/4 lb. Performance wise can't really say but it seemed to make a small difference (been a few years ago that I have done this). Ram engines that makes EA81 aircraft engines sells a lightened underdrive EA81 pulley, don't remember the weight or price but a search will turn that up for you. Probably not worth what they would want for one unless you have extra cash to burn. Glenn Quote Link to comment Share on other sites More sharing options...
Phizinza Posted September 18, 2006 Share Posted September 18, 2006 Probably not worth what they would want for one unless you have extra cash to burn.Seems to be the way for all EA81 upgrades Quote Link to comment Share on other sites More sharing options...
daeron Posted September 18, 2006 Share Posted September 18, 2006 Re: Exhaust - Nothing much matters after the first major obstruction/restriction in the exhaust path. Low-end torque will not be adversely effected by a too-large pipe following a cat or muffler. All the old lore about pipe diamater deals with a straight pipe, where exhaust pulses and flow are not interfered with by a muffler. Exhaust pulses are reflected/dampened by every change in tubing cross-section and or reflective obstruction, so they never make it past a cat or muffler (even glass-packs mangle the pulse). Keeping a pipe small past the cat/muffler just adds flow restriction, and is not needed for "extraction" purposes. thank you. that was my first thought when i finally learned about the whole extraction thing.... any expansion chamber would act almost as a capacitor or damper to even that all out. Quote Link to comment Share on other sites More sharing options...
idosubaru Posted September 18, 2006 Share Posted September 18, 2006 Hope you don't really want low end torque, cause with exhaust that big your gonna loose it. i'm not an exhaust expert but i've put larger exhaust on an XT6 which has a much larger engine (2.7 liter 6 cylinder) and 145 hp stock and i even think 2.5" is too larger for that. i think 2...maybe 2.25" depending what you're after is more than adequate on those. i'd think 2" or 2.25" would be maximum you'd want for normal applications on a 1.8 liter subaru. but again, just talking from experience, i don't know much about exhaust theory. i agree with all the comments on power too. i've done all sorts of things to the 145hp 6 cylinder ER27 engine in the XT6. exhaust, removed A/C pulley, ignition upgrades, intake modifications, new hewgaskets and valve job, perfect compression, play with timing, synthetic fluids...blah blah blah. alot of that stuff adds to reliability or needed replacement anyway, but in the end you don't end up with tons more horsepower. very little difference really, even on a much larger and more powerful engine than the 1.8 liter. old non-turbo subaru's are not power houses by any means. i wouldn't spend too much time on trying to make it powerful. if you really want power, then start planning ahead for a turbo or a complete newer generation swap. read through all the EA82 and even ER27 posts about modifications and you won't see great results. lots of effort and time on little return really. but..there has been lots of awesome work done and i highly recommend reading about it including looking at some good dyno results all through this forum. i highly value these vehicles, but not as powerhouses. Quote Link to comment Share on other sites More sharing options...
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