[QUOTE=Van-man;52670551]Pour in sand to port your head afterwards[/QUOTE]
Thanks. Brb, adding 10 horsepower.
[QUOTE=FordLord;52670474]From what it looks like, whoever did the headgaskets didn't do them right.
That's likely a felpro headgasket, they don't have a good history in the Subaru community.
It doesn't look to me like the head was machined or anything.
Felpro gasket + no machining could mean some oil seaping in and leaving those deposits.
The EJ22 series is one of the bulletproof engines. Needing a headgasket is usually a redflag that it has had poor maintenance for an extended period.
As far as clenliness of the piston, burning coolant will clean the piston. Burning it for extended periods will make it look nearly new.[/QUOTE]
Sure enough.. looked up some more cases online and I see others with coolant. Ironing that have shiny new pistons on that cyl. Interesting! Never knew that.
Any recommendations on headgasket brands? OEM?
[QUOTE=fishyfish777;52669678]You are basically making the silly semantic argument that a carefully timed reflected pressure wave in the exhaust is not backpressure
Just because you understand the theory of how something works doesn't mean you have to be rude about it when someone makes a slightly lacking description / uses a word in a slightly different way
This is a Christian server, be civil[/QUOTE]
it's not physical pressure though, it's an acoustic wave. if you put a probe in there to measure pressure you'd get a negative number, because the shape of the pipe is designed to first scavenge exhaust gasses, then use acoustic properties to reflect unburned fuel
like you may as well say it's waves of water
I think your exhaust needs to be louder, can't hear it over the fucking supercharger. :dogwow:
[QUOTE=butre;52671657]it's not physical pressure though, it's an acoustic wave. if you put a probe in there to measure pressure you'd get a negative number[/QUOTE]
you are missing like half the words from these statements for them to make any sense
[QUOTE=Lerlth;52671737]I think your exhaust needs to be louder, can't hear it over the fucking supercharger. :dogwow:[/QUOTE]
longtube headers, catless x-pipe, vibrant resonators:
[IMG]https://scontent.fphl2-3.fna.fbcdn.net/v/t1.0-9/15442345_10207897600461733_7410388230548330641_n.jpg?oh=c392205586ed66bfe63c860ab9ff383d&oe=5A157058[/IMG]
im trying!!
[QUOTE=butre;52671657]it's not physical pressure though, it's an acoustic wave. if you put a probe in there to measure pressure you'd get a negative number, because the shape of the pipe is designed to first scavenge exhaust gasses, then use acoustic properties to reflect unburned fuel
like you may as well say it's waves of water[/QUOTE]
You do understand that acoustics are pressure waves through a medium, such as air, right? Sound is air pressure. If sound is hitting an object, it is applying pressure to said object. Ears take that pressure and turn it into sensory data. Sound waves through water (my job is analyzing them) are literally just pressure waves within the water.
[QUOTE=MaverickIB;52671922]You do understand that acoustics are pressure waves through a medium, such as air, right? Sound is air pressure. If sound is hitting an object, it is applying pressure to said object. Ears take that pressure and turn it into sensory data. Sound waves through water (my job is analyzing them) are literally just pressure waves within the water.[/QUOTE]
yes, but it's not backpressure, as in not gas pressure. it's a whole different thing ie you can't measure sound with psi
yall are pretty brilliant at missing the point
[QUOTE=butre;52672480]yes, but it's not backpressure, as in not gas pressure. it's a whole different thing ie you can't measure sound with psi
yall are pretty brilliant at missing the point[/QUOTE]
i think the point is that if you correct someone's vague terminology by making a counterpoint in vague terminology and act proud of yourself, people will notice
even though the last few statements have slowly started to slide into completely factually incorrect territory
[editline]11th September 2017[/editline]
sorry for bully, im done getting amusement out of justifications on why a wave of backwards moving pressure shouldn't be called backpressure
Man the Kawasaki Z series is so, SO much nicer looking than the Ninja.
Ended up going with a Z300 for the first bike and I'm happy af with the choice. Everything good about the ninja except better looking (in my opinion anyway).
[t]https://i.imgur.com/BNBRvvu.jpg[/t]
[QUOTE=Araknid;52672703]Man the Kawasaki Z series is so, SO much nicer looking than the Ninja.
Ended up going with a Z300 for the first bike and I'm happy af with the choice. Everything good about the ninja except better looking (in my opinion anyway).
[t]https://i.imgur.com/BNBRvvu.jpg[/t][/QUOTE]
I know it's done to death, but I'm still a sucker for the green/black... But all the same that's a lovely bike, congratulations! Also sharp pick to whoever owns that Tiger XRX in the background
[QUOTE=butre;52672480]yes, but it's not backpressure, as in not gas pressure. it's a whole different thing ie you can't measure sound with psi
yall are pretty brilliant at missing the point[/QUOTE]
You *could* measure sound in PSI if you had precise enough equipment. It wouldn't net you very much useful information beyond a convoluted way of looking at amplitude. Since sound is waves, not a constant pressure, pressure isn't a way we have tried to measure it.
It isn't a whole different thing. The pressure you're thinking is different really isn't, the only difference is sound is pressure waves instead of constant pressure. Gas pressure isn't the only form of pressure. Nobody said backpressure specifically had to be from exhaust gasses, technically sound reverberation providing that pressure is [i]still[/i] technically backpressure.
My brake parts are now over a week late...Thought Rockauto didnt do this kind of crap.
Waves are repeated short bursts of pressure, they cant be measured in the normal sense of pressure.
It would have to be measured in amplitude like a sine wave but without a negitive past the center point on the wave form, so only ups and no downs if you can see my strangely worded meaning.
As far as I understand is back pressure is the vibration in the exhaust that causes unburned vaporized fuel and air in some part to make it back to the cylinder to be burned in 2 cycle engines, while letting the ever increasing gas pressure to escape normally. In 4 cycle systems, back pressure is not really a thing as the principle is different. Its reliant on pulses from the cylinders creating high and low pressure zones which alternate and kind of act as a way to help keep exhaust flowing fast.
If the pipe is too small theres a restriction, if its too big the gasses can't gain momentum and can cause a loss of power due to a lessened low or lower pressure zone after the exhaust valve. The low pressure zone is there to help pull all burned gasses out of the cylinder which allows for a cleaner and in some cases a more powerful burn.
[QUOTE=MaverickIB;52676011]You *could* measure sound in PSI if you had precise enough equipment. It wouldn't net you very much useful information beyond a convoluted way of looking at amplitude. Since sound is waves, not a constant pressure, pressure isn't a way we have tried to measure it.
It isn't a whole different thing. The pressure you're thinking is different really isn't, the only difference is sound is pressure waves instead of constant pressure. Gas pressure isn't the only form of pressure. Nobody said backpressure specifically had to be from exhaust gasses, technically sound reverberation providing that pressure is [i]still[/i] technically backpressure.[/QUOTE]
ok lets start from zero, I think we've both lost the plot here
sound does often involve pressure, but it's not pressure, rather oscillations in pressure (or stress, particle displacement/velocity, and so on). those oscillations are what steer unburnt fuel back into the combustion chamber.
backpressure is typically thought of as a constant gas pressure caused by restrictions in the exhaust system, and those restrictions do not exist in an ideal 2 stroke exhaust system.
in the chamber itself there is no appreciable gas pressure, ideally it should be below atmospheric pressure but due to packaging and cost constraints this often isn't an option. this is where the famous quote from Walter Kaaden comes from: "You'll know when you have the design right, because the chamber will then be impossible to fit on the motorcycle without having it drag the ground, burn the rider's leg, or force the relocation of one or more major components."
Automotive addicts v smelly gasses from the rear edition
[QUOTE=JesseR92;52676248]My brake parts are now over a week late...Thought Rockauto didnt do this kind of crap.[/QUOTE]
They're generally pretty good about getting parts to you in 2-5 days. But sometimes things will be pretty late. You can usually complain and get a discount on your next purchase though.
Yesterday I got the R9 back after some serious gas tank and wiring maintenance, and the time for the near-complete rebuild of the E36 is getting near. My hype is redlining.
Fucking overtimes tho, I can't help dismantling my car if I leave the job at 7PM and the workshop is one hour away :hammered:
I ate through my disk brakes recently... Now I have to drive around a clunky espace with way too much power in it (232hp) instead of my comfy Mazda 323 bg.
[t]https://i.imgur.com/QvLDM7h.jpg[/t] [t]https://i.imgur.com/yjkgR23.jpg[/t]
[t]https://i.imgur.com/aUbMQWk.jpg[/t] [t]https://i.imgur.com/HAp5G4L.jpg[/t]
The shiny parts are metal fragments from the disks. No clue how much this is gonna cost me in the end but we'll see.
New pads and discs and you should be good-to-go. Looks like the backing on the pads is still there, right?
Yeah I did that once, completely wore through to the backing plate on the fronts. Somehow, I didn't quite manage to fuck up the rotors or calipers, particularly because the second I felt the brakes go, I made an effort to use the brakes as little as possible, even going as far as trying to only use the handbrake.
Not quite fit for the thread, but I just went and saw Baby Driver. And holy shit it it good. The car chases and scenes are fucking brilliant, not to mention the perfect music.
I liked that Baby Driver wasn't stupid retarded Fast n Furious style car porn wank. It used cars that were realistic for the situation at hand.
I only saw a little bit, but it definitely seemed inspired by Drive.
Guess I missed out. I kept writing it off, even after watching the first 10mins or whatever was released as a teaser. I really loved Drive, so if it's anything like it, I probably will enjoy it the same as you guys.
Brand new valve cover gasket #2 for the D15B...
[t]https://i.imgur.com/UseAwSo.jpg[/t]
Only the 5th time I've replaced one of these on this car, maybe 5th time is the charm?
Z6 style valve covers are beyond stupid. The bolts have a grommet that you have to cut off and press a new one onto the bolt and the spark plug tube seals are a total nightmare to remove and then reseat around the tube when putting the cover back on. After looking at some images, I'm now highly questioning the way that I orientated them too.
[t]https://i.imgur.com/MuB78Bw.jpg[/t][t]https://i.imgur.com/XxDmcur.jpg[/t]
I'm almost positive I've spent more than $100 purely on valve cover gaskets for that car, I pretty much bought the JDM D15B engine to get rid of the older style non-vtec head...
Thoguhts on Nissan Qashqai and Nissan X-Trail?
Driving my 2001 golf which is literally falling apart (last week brake fluid leaked out so had to get it towed and fixed.
Nissan offers decent PCP deal on those two.
So looking into options now.
[QUOTE=arleitiss;52680918]Thoguhts on Nissan Qashqai and Nissan X-Trail?
Driving my 2001 golf which is literally falling apart (last week brake fluid leaked out so had to get it towed and fixed.
Nissan offers decent PCP deal on those two.
So looking into options now.[/QUOTE]
I'd say neither because of their disappointing handling and the fact Nissan killed off "traditional" cars for SUV and crossover abominations.
Thanks Renault for fucking them up.
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