WJM Posted May 23, 2006 Share Posted May 23, 2006 As the title says...I'm brain storming and its REALLY soaking in here. I am waiting to hear back from Delta cam on a set of cams and springs to be safe to rev to 8. The real question is...can the bottom end handle the revs and can the oil pump keep up the demand? I will be on MPFI heads, spyder intake, delta cams, appropriate valve springs, borla header, high flow cat, and a custom cat back with MegaSquirt as EMS. Ofcourse, a custom intake as well as a 2.5" throttlebody. WJM thinks I should just rev the F*** out of it until it blows....that'll tell WJM if its ok or not. Quote Link to comment Share on other sites More sharing options...
jeffast Posted May 23, 2006 Share Posted May 23, 2006 jeffast agrees Quote Link to comment Share on other sites More sharing options...
TheSubaruJunkie Posted May 23, 2006 Share Posted May 23, 2006 Will... when will you learn? Good to see you back here again tho. -Brian Quote Link to comment Share on other sites More sharing options...
[HTi]Johnson Posted May 23, 2006 Share Posted May 23, 2006 WJM thinks I should just rev the F*** out of it until it blows....that'll tell WJM if its ok or not. UGH, it not my money, I agree. Quote Link to comment Share on other sites More sharing options...
kingbobdole Posted May 23, 2006 Share Posted May 23, 2006 you must really like building engines. Quote Link to comment Share on other sites More sharing options...
simple monkey Posted May 23, 2006 Share Posted May 23, 2006 a custom intake as well as a 2.5" throttlebody. individual throttle bodies possibly? Quote Link to comment Share on other sites More sharing options...
soobmater Posted May 23, 2006 Share Posted May 23, 2006 WJM thinks I should just rev the F*** out of it until it blows....that'll tell WJM if its ok or not. Soobmater agrees Quote Link to comment Share on other sites More sharing options...
Caboobaroo Posted May 23, 2006 Share Posted May 23, 2006 won't be long now until we see a thread about how he blows his engine again.... just kiddin Will, I've got faith in you! Now I have to stop blowing engines myself... stupid oil pumps. Quote Link to comment Share on other sites More sharing options...
keltik Posted May 23, 2006 Share Posted May 23, 2006 Can we get a vid of the trial run? I recently read an article on how stock rover and honda engines are good to 9,000rpm balanced. Im assuming the same goes for a soob. KELTIK Quote Link to comment Share on other sites More sharing options...
GLCraig Posted May 23, 2006 Share Posted May 23, 2006 The real question is...can the bottom end handle the revs and can the oil pump keep up the demand? I've seen an EA82 hold up to the Tach being pegged for long enough that the cat melted down. After that there was too much back pressure to keep the rpms up. We were trying to kill the engine, crap occurs I guess. Quote Link to comment Share on other sites More sharing options...
4x4_Welder Posted May 23, 2006 Share Posted May 23, 2006 From the looks of it, harmonics may come into play around 7k, but the belts may help some. You might need a damper to go to the other side of 8k though. Whay not put the heads and cams on a junker block, put it on a stand, and rev that till it blows? Then you'll know. Quote Link to comment Share on other sites More sharing options...
Jerry DeMoss Posted May 23, 2006 Share Posted May 23, 2006 I am eager to see the end result!Sounds very awsome!Besides thats how things get done! Quote Link to comment Share on other sites More sharing options...
DerFahrer Posted May 23, 2006 Share Posted May 23, 2006 Don't forget the ign system. I don't know if a stock EA82 disty is ready to operate at 8k rpm. Besides, SOHC and 2-valve-per-cylinder isn't exactly a high-revving design. Quote Link to comment Share on other sites More sharing options...
jeffast Posted May 23, 2006 Share Posted May 23, 2006 i dunno i think it could handle it i'd like to try somthing similiar somday Quote Link to comment Share on other sites More sharing options...
NorthWet Posted May 23, 2006 Share Posted May 23, 2006 ...Besides, SOHC and 2-valve-per-cylinder isn't exactly a high-revving design. I have a SOHC 2-valve-per-cylinder that I routinely run to 12.5k and has seen 13.5k. Come to think of it, the crankshaft length is about the same as the EA82's... The timing belt could also be a problem at high rpm, as the load on them will increase greatly with RPM. Quote Link to comment Share on other sites More sharing options...
subeman90 Posted May 23, 2006 Share Posted May 23, 2006 valve float????? Quote Link to comment Share on other sites More sharing options...
joostvdw Posted May 23, 2006 Share Posted May 23, 2006 valve float????? and springs to be safe to rev to 8 there's your answer I think the crank and bearings and so forth can take the 8k, but I think you will run into some unsuspected problems, like cambelts ripping apart, disty's blowing up, they were never designed for 8k, and thus are not as balanced as the crank is (not that THAT is designed for 8k, but a hell of a lot more balanced than a rotor) Quote Link to comment Share on other sites More sharing options...
WJM Posted May 23, 2006 Author Share Posted May 23, 2006 IThe timing belt could also be a problem at high rpm, as the load on them will increase greatly with RPM. I seems there is a 3.5 flat 12 with timing belts that turned to 12,500.... Quote Link to comment Share on other sites More sharing options...
PoorManzImpreza Posted May 23, 2006 Share Posted May 23, 2006 Yes actually I think the HLA will be the problem at 8-9k rpm..once you get stiffer springs in there the valve springs won't be the cause of float.. 8k isn't that high and lets not forget rally prepped ea82s ran to 7500rpm with approx 12psi of boost.. but they had shim adjusted mechanically locked HLAs in there..I just think the HLA relief system will cause them to lose pressure at that rpm..maybe not, but we'll find out if Will does what he likes to do.. Quote Link to comment Share on other sites More sharing options...
WJM Posted May 23, 2006 Author Share Posted May 23, 2006 if I feed the engine 300 psi of oil pressure.....it should not be an issue... Quote Link to comment Share on other sites More sharing options...
jeffast Posted May 23, 2006 Share Posted May 23, 2006 i am dieing to hear how this goes how do you plan to get 300 psi of oil pressure? Quote Link to comment Share on other sites More sharing options...
WJM Posted May 23, 2006 Author Share Posted May 23, 2006 SUper duper ultra dry sump. Quote Link to comment Share on other sites More sharing options...
NorthWet Posted May 24, 2006 Share Posted May 24, 2006 I seems there is a 3.5 flat 12 with timing belts that turned to 12,500.... I wasn't meaning to imply that a high-speed engine CAN'T use toothed belts cam drive, just that the existing design MIGHT not be able to handle it. Strains go up with increased RPM, exponentially IIRC, and stiffer springs just add to the strain. Durability might become an issue. And too much oil pressure can be as bad as too little. Flow becomes more important, as this is waht props up the pressure. One street-turned-race-engine that I read about (Datsun's L24) had issues with the oil being thrown out of over-zealously drilled conrod journals at high RPM, and starving the further-from-the-supply journals of oil. (They also had some nasty harmonic issues due to crank length, but not terribly applicable here.) Quote Link to comment Share on other sites More sharing options...
WJM Posted May 24, 2006 Author Share Posted May 24, 2006 Either way, it doesnt look like this is actually going to happen anytime soon. EJ22E is 4 parts away from getting the green for go on a weekend thrashing to get it roaring to life. Quote Link to comment Share on other sites More sharing options...
subeman90 Posted May 24, 2006 Share Posted May 24, 2006 reading ownes me.... Quote Link to comment Share on other sites More sharing options...
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