ivonr Posted March 31, 2015 Share Posted March 31, 2015 It's less about the top cover and more about the undercover -- it helps with pressure differentials which lend to more air going into the TMIC. this is still have. lost a few pop-its and replaced with zip ties Link to comment Share on other sites More sharing options...
MrTris Posted March 31, 2015 Share Posted March 31, 2015 this is still have. lost a few pop-its and replaced with zip ties Wait til they rip and then you have to re-drill some holes and STILL run with zipties.. Link to comment Share on other sites More sharing options...
BoozeRS05 Posted March 31, 2015 Share Posted March 31, 2015 I'm of the belief that both the top and lower covers are functional to some extent, and maybe to a large extent, or Subaru wouldn't have included them. My $0.02 EB's Subaru journal - 2005 LegacyGT Wagon & 2014 Forester FB25 (2008 specB - RIP) IG@legacygtliving Link to comment Share on other sites More sharing options...
ivonr Posted March 31, 2015 Share Posted March 31, 2015 I'm of the belief that both the top and lower covers are functional to some extent, and maybe to a large extent, or Subaru wouldn't have included them. My $0.02 could be, fair reasoning. as long as it wont affect my engine health w/ daily driving i'm leaving it off Link to comment Share on other sites More sharing options...
MrTris Posted March 31, 2015 Share Posted March 31, 2015 could be, fair reasoning. as long as it wont affect my engine health w/ daily driving i'm leaving it off Not drastically so, no. Link to comment Share on other sites More sharing options...
BoozeRS05 Posted March 31, 2015 Share Posted March 31, 2015 What makes you think you're qualified to make these types of comments? You have no clue how drastically those pieces effect the motor's health/performance over time. It's no wonder you'll be replacing your short block every 60k miles. EB's Subaru journal - 2005 LegacyGT Wagon & 2014 Forester FB25 (2008 specB - RIP) IG@legacygtliving Link to comment Share on other sites More sharing options...
MrTris Posted April 1, 2015 Share Posted April 1, 2015 Was already worried about these at one point in time. A Subau Master Mechanic (and owner of the No 1 Subaru Performance shop on the Westcoast) has told me time and again -- Engine cover, undercover -- Neither make a huge difference. They're nice to have, keeps things clean, but not critical one way or the other. Link to comment Share on other sites More sharing options...
jasejase Posted April 1, 2015 Share Posted April 1, 2015 I could have swore I read about engine covers in general (not just subies), and how engineers and designers use them as an integral air flow tool. Link to comment Share on other sites More sharing options...
TovarishGruzin Posted April 1, 2015 Share Posted April 1, 2015 Stop driving your car. Lies and propaganda! I stopped driving my car for over two years and now it's falling apart!! Link to comment Share on other sites More sharing options...
Max Capacity Posted April 1, 2015 Share Posted April 1, 2015 I have had my engine cover removed since about 2 weeks after I bought the car. When did I buy it...that was late June 2004. I haven't noticed any issues. The one benefit without it is, I can see everything on top of the engine. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
jasejase Posted April 1, 2015 Share Posted April 1, 2015 I could have sworn I read that your mother was the only woman in history to get pregnant from ingesting ejaculate, but, that doesn't make it true. You say the sweetest things! Link to comment Share on other sites More sharing options...
frank_ster Posted April 1, 2015 Share Posted April 1, 2015 The top engine cover seals to the hood on the stock intercooler setup. That likely helps. But if running aftermarket intercooler something sealing to the hood is likely better. The under tray does help with airflow a bit but mostly the radiator. But the cars are far from overheating . I feel the two covers are more for proformance than reliability . As the n/a cars dont come with them. Now that's thinking out of the boxer! fyi all 05 + legacy's have built in code reader Link to comment Share on other sites More sharing options...
BoozeRS05 Posted April 1, 2015 Share Posted April 1, 2015 Something about fresh cool air running through the intercooler and radiator are important enough that I'll always have mine in place. A well lubricated and cool running turbo Subaru motor is a reliable one. EB's Subaru journal - 2005 LegacyGT Wagon & 2014 Forester FB25 (2008 specB - RIP) IG@legacygtliving Link to comment Share on other sites More sharing options...
ivonr Posted April 1, 2015 Share Posted April 1, 2015 damnit now i'm having thoughts of putting mine back on...maybe i'll paint it a different color haha Link to comment Share on other sites More sharing options...
Rhitter Posted April 1, 2015 Share Posted April 1, 2015 Just read Max's post. He hasn't had it on for years and it's been fine. Of all the pieces to argue about - an engine cover.... My OBXT build Link to comment Share on other sites More sharing options...
BoozeRS05 Posted April 1, 2015 Share Posted April 1, 2015 He's also had to rebuild a motor. Not saying there is any correlation, but.. EB's Subaru journal - 2005 LegacyGT Wagon & 2014 Forester FB25 (2008 specB - RIP) IG@legacygtliving Link to comment Share on other sites More sharing options...
Rhitter Posted April 1, 2015 Share Posted April 1, 2015 He's also had to rebuild a motor. Not saying there is any correlation, but.. I have always had mine on and I had to rebuild my motor. I had it on during a track day and the cooling was insufficient in the late afternoon heat. The evidence that it doesn't really matter is with the wrx. Same intercooler and bigger turbo - no engine cover. If Subaru designed their cars with such precision that something like an engine cover would determine if you needed a rebuild... Well almost every single legacy gt would be off the road by now. My rebuild was an actual rebuild due to cracked ringland not wanting to rebuild because oil consumption was high. My OBXT build Link to comment Share on other sites More sharing options...
frank_ster Posted April 1, 2015 Share Posted April 1, 2015 lol thinking a shield will prevent a engine rebuild is totally grasping at straws. i'm sure the oil filter has 99.999% more to do with it than a piece of plastic. Now that's thinking out of the boxer! fyi all 05 + legacy's have built in code reader Link to comment Share on other sites More sharing options...
BoozeRS05 Posted April 1, 2015 Share Posted April 1, 2015 Not what I said, but All the anecdotal evidence you guys want to provide and believe, feel free. What's it tell you that NA's don't come with these items? It's not without engineering and profitability that auto manufacturers do these things. I'll stick by my story. They appear to be directly related to cooling, and motors require cooling last time I checked. EB's Subaru journal - 2005 LegacyGT Wagon & 2014 Forester FB25 (2008 specB - RIP) IG@legacygtliving Link to comment Share on other sites More sharing options...
BigTDogg MA Posted April 1, 2015 Share Posted April 1, 2015 By design, the engine cover helps seal to the OEM TMIC. The bottom cover helps with air flow and keeps shit from getting your accessory belts and other shit dirty. Plus it gets you high when it melts after contacting your aftermarket unwrapped header. Link to comment Share on other sites More sharing options...
frank_ster Posted April 1, 2015 Share Posted April 1, 2015 ok but don't forget airflow into intoolercooler doesn't make the car last longer. its performance thing. Now that's thinking out of the boxer! fyi all 05 + legacy's have built in code reader Link to comment Share on other sites More sharing options...
BigTDogg MA Posted April 1, 2015 Share Posted April 1, 2015 Seeing how this is a reliability mods thread, then yes, the top cover is useless for this purpose. Link to comment Share on other sites More sharing options...
ivonr Posted April 2, 2015 Share Posted April 2, 2015 has anyone mentioned a lightweight crank pulley yet? CovertRussian's thread is amazing. how common is it for the stock crank pulley to separate like that? Nuts! Link to comment Share on other sites More sharing options...
frank_ster Posted April 2, 2015 Share Posted April 2, 2015 i work on quite a few high mileage subarus and none have any issues with the front pulley. i would recommend just keeping an eye on it. Now that's thinking out of the boxer! fyi all 05 + legacy's have built in code reader Link to comment Share on other sites More sharing options...
ivonr Posted April 2, 2015 Share Posted April 2, 2015 looks like it's only happened to a handful of people here, but when it goes it can do some damage Link to comment Share on other sites More sharing options...
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