That4doorKiD Posted October 18, 2016 Author Report Share Posted October 18, 2016 Made the mock up so much easier after. Harbor Great Quote Link to comment
That4doorKiD Posted October 18, 2016 Author Report Share Posted October 18, 2016 Things I've bought recently: 2.5mm Needle and Seat for 32/36 Weber (Good for fuel pressure rise) Boost referenced power valve (Boost activated fuel enrichment) Boost referenced carb FPR(so expensive) Extra schedule 40 elbows and straight pipe Ssr Mk-3's waiting in frieght Looking for: Forged pistons External wastegate Wideband sensor MSD Boost Timing Master Gonna do my own water injection set up down the road with a nozzle, fuel pump, and Hobbes boost activated switch. Asked the carburetor shop guy if a Weber 32/36 would leak fuel from boost, they put the myth to rest. A 32/36 doesn't need to be O-ringed, the shafts can handle it. Big relief for me Quote Link to comment
Fast720 Posted October 18, 2016 Report Share Posted October 18, 2016 Hey 4 door kid , looks like your having a good time !!!! Crank up the heat on that welder !! , is it a 110 volt machine or 220 Volt ? the manifold plate that bolts on the head might need to be pre heated before you weld it , or your not going to get any penetration , and if it too cold it will probably crack or break . Mig over stick for sure , Tig would be even better ..... Cheers Fast720 2 Quote Link to comment
Anderson521 Posted October 18, 2016 Report Share Posted October 18, 2016 Looks awesome, I have the same helmet and works great for the price 1 Quote Link to comment
datsunfreak Posted October 19, 2016 Report Share Posted October 19, 2016 Plan to heat shield that dizzy somehow. Friend's car with a similar set-up fried a few during shakedown... Quote Link to comment
datzenmike Posted October 19, 2016 Report Share Posted October 19, 2016 Made first Cylinder piping about 5 inches shorter than the rest of the header. Subaru Rumble sound from uneven header. Subaru engines are not inline they are flat like the old VWs. I think this is more to do with the strange exhaust sound not the length of a pipe. Agree the auto darkening helmet is the greatest invention. Quote Link to comment
Abe Froman Posted October 19, 2016 Report Share Posted October 19, 2016 Here is a turbo L series I built years ago, 2 photo's of different stages of the build. 2 Quote Link to comment
That4doorKiD Posted October 19, 2016 Author Report Share Posted October 19, 2016 But why no intercooler if you did blow thru Quote Link to comment
Noflers Posted October 19, 2016 Report Share Posted October 19, 2016 Subaru engines are not inline they are flat like the old VWs. I think this is more to do with the strange exhaust sound not the length of a pipe. Agree the auto darkening helmet is the greatest invention. It does kind of have to do with header length. A boxer will always sound like a boxer, but unequal length headers make for that Subaru rumble. 4doorkid, Sounds like you're on a better route than before. Nice work. Quote Link to comment
Dolomite Posted October 20, 2016 Report Share Posted October 20, 2016 I've heard a Subaru with equal length headers, didn't sound like a subie at all, had a very even exhaust note. Quote Link to comment
flatcat19 Posted October 20, 2016 Report Share Posted October 20, 2016 Plenty of videos on YouTube covering said topic. I like the boxer rumble. But given how underpowered they are, getting equal length headers to squeeze the tiny bit you can out of them seems worth it. Even if you have to give up the sound. I don't think an inline 4 would have the same effect. You'd have to have 1 and 3 or 2 and 4 longer than the opposite to create any effect. With that though, your scavenging would be all messed up. Possibility of creating backfires. One would think. Hm. Quote Link to comment
datzenmike Posted October 20, 2016 Report Share Posted October 20, 2016 Sound travels at 746MPH or about 1,200 feet in one second. If a header pipe was 1 foot longer than the others it might delay the sound by 1 / 1,100 of a second. You might hear the out of phase cylinder but I don't think I can. It takes almost 400 times longer to blink your eye. 1 Quote Link to comment
UnderControl Posted October 20, 2016 Report Share Posted October 20, 2016 Manifold is looking good. Looking forward to seeing it finished. Sound travels at 746MPH or about 1,200 feet in one second. If a header pipe was 1 foot longer than the others it might delay the sound by 1 / 1,100 of a second. You might hear the out of phase cylinder but I don't think I can. It takes almost 400 times longer to blink your eye. I don't think an inline 4 would have the same effect. Not exactly boxer, but driving next to a scooby in it was an interesting experience. 2.4L ecotec with 4 to 2 header with mismatched cylinders (1 paired with 3, 2 with 4), dual exhaust for about 2' before going single. 1 Quote Link to comment
DaBlist Posted October 20, 2016 Report Share Posted October 20, 2016 If you look at this picture out of context it looks like something purposed by the government to keep emissions from escaping the engine 2 Quote Link to comment
That4doorKiD Posted October 20, 2016 Author Report Share Posted October 20, 2016 The article I read, well more than a few actually were pretty conclusive about the exhaust tone produced by an uneven length header. " The shorter runner on a UEL header will create a louder noise than a longer runner as it has less piping to travel through. This results in the iconic Subuaru Rumble. This rumble doesnt exist on cars running an Equal Length header" Some articles mentioned the boxer motor also contributing to the tone. So many mixed reviews on the internet.. but 1 and 3 on my headers are definitely shorter than 2/4. Quote Link to comment
flatcat19 Posted October 20, 2016 Report Share Posted October 20, 2016 1/3 and 2/4 being matched, regardless of length... One cylinder is pushing while the other should be sucking... One exhaust valve starting to open as another is starting to close... There has to be vacuum there somewhere... Then the other pair of cylinders is doing the same thing... Really seems like scavenging CAN'T happen... The force of vacuum should be greater than the force of exhaust... Suck, Squish, Bang, Blow...not so much a 4 cycle anymore... Not fact, just thinking out loud. Interesting topic. Quote Link to comment
datzenmike Posted October 20, 2016 Report Share Posted October 20, 2016 If the header was open possibly. The longer pipe would cool the exhaust slightly more but shorter or longer header pipes doesn't exist if on a full exhaust system. Sound travels the same distance of pipe over all. . Quote Link to comment
flatcat19 Posted October 20, 2016 Report Share Posted October 20, 2016 I'm not even thinking about sound. I'm thinking more about where this spark is going at the same time exhaust is being pulled in and pushed out at the same time... With a turbo sitting right next to all of it... Quote Link to comment
datzenmike Posted October 20, 2016 Report Share Posted October 20, 2016 The turbo will homogenize the sound any way. You can almost run a turbo engine without a muffler. 1 Quote Link to comment
datsunfreak Posted October 21, 2016 Report Share Posted October 21, 2016 You can almost run a turbo engine without a muffler. Lots of people do. Even Dodge did it. :rofl: We call turbos "spinny mufflers". Yes, we're dorks. 2 Quote Link to comment
That4doorKiD Posted October 26, 2016 Author Report Share Posted October 26, 2016 One week later...I'm getting back to finishing the last piping. Took like an hr and a half. One piece at a time... Current state...gonna finish today the last small piece Holliday card from the Kids 1 Quote Link to comment
mttam510 Posted October 27, 2016 Report Share Posted October 27, 2016 Your dogs look proud of you. Quote Link to comment
Guest Mojo510 Posted November 22, 2016 Report Share Posted November 22, 2016 Update please......this thing making fire and boost yet? Quote Link to comment
Dolomite Posted November 22, 2016 Report Share Posted November 22, 2016 Hopefully it's not making a fire. Quote Link to comment
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.