oldrx Posted September 18, 2015 Share Posted September 18, 2015 It's a giant pain in the ass, been there, done that, but wow, sure works. It's all the shaking and rolling and rocking to make sure it coats everything that sux. I suppose it might be easier with a smaller tank, mine's about 60l. It is a mission, i found the drying and drying and guessing if it was dry enough (needs to be crazy dry) before starting the worst Quote Link to comment Share on other sites More sharing options...
Styles Posted September 18, 2015 Share Posted September 18, 2015 It is a mission, i found the drying and drying and guessing if it was dry enough (needs to be crazy dry) before starting the worst I had a hair drier in one of the ports, a fan heater kind of blowing on the biggest one, and in the sun, left it like that for a couple of hours, though "that'll do" moved the drier and heater, and proceeded to pick it up with my bare hands........ realised when I had it about chest height that my hands were burning, didn't want to drop it so had to suffer those few extra moments gently putting it down. I'm not a smart man, Jenny 4 Quote Link to comment Share on other sites More sharing options...
Roman Posted September 19, 2015 Author Share Posted September 19, 2015 A few random thoughts.... Lets say you've got an engine where each cylinder is 500cc When the intake valves open and it gulps in air, if the volume of your intake runner is greater than 500cc it's just sucking in the air that's already in the runner, rather than from atmosphere.Then when the intake valve closes it's got the whole rest of the cycle to "refill" which is where bellmouths etc help it fill back up more efficiently. I wonder if this is why people say that if you've got shorter runners they need to be wider, longer ones skinnier.... To make sure you have that minimum amount of volume in there so you're never sucking air from "atmosphere" during the induction period. So can think of it as two redbull cans stacked on top of each other for minimum size. Also, You see those evos that have vortex generators on the trailiing edge of the roof. Which makes the air swirl and stick to the rear window instead of detaching and causing turbulence/drag: Well this is exactly the same reason that just about every modern car now has its car aeriel mounted in about that position, centrally on the rear of roof. Because they use it as a vortex generator to reduce drag.They're not required across the whole top edge of the roof because air swirls around from the sides as well. (Look at streamers in the evo picture above, they bunch in towards the centre because of air coming around from C pillar) When you see a car with the aerial mounted centrally near the front of the windscreen on top of the roof, this is because airflow starts detaching from right up front already. (compensating for a shitty aero design?) 1 Quote Link to comment Share on other sites More sharing options...
Testament Posted September 20, 2015 Share Posted September 20, 2015 That 500cc in the runner can't go into the cylinder unless another 500cc takes its place though, and the chain goes on. It depends where the choke point in the inlet tract is though... . Not as big a deal on n/a with itbs but on a turbo car having a big plenum can be of benefit in this sense. Quote Link to comment Share on other sites More sharing options...
h4nd Posted September 20, 2015 Share Posted September 20, 2015 Quote Link to comment Share on other sites More sharing options...
0R10N Posted September 21, 2015 Share Posted September 21, 2015 May be one for the DIY fuel injection thread, but has anyone here had any success making their own knock headphones/detonation cans? Quote Link to comment Share on other sites More sharing options...
cute wee gem Posted September 21, 2015 Share Posted September 21, 2015 From memory it's already been discussed in the DIY efi thread Quote Link to comment Share on other sites More sharing options...
cute wee gem Posted September 21, 2015 Share Posted September 21, 2015 And yes. they are relativelt easy to make Quote Link to comment Share on other sites More sharing options...
Roman Posted September 21, 2015 Author Share Posted September 21, 2015 May be one for the DIY fuel injection thread, but has anyone here had any success making their own knock headphones/detonation cans? yep, wideband 2 wire knock sensor like this: http://www.aliexpress.com/item/GM-Knock-Sensor-Ignition-Knock-Detonation-Sensor-for-2013-Chevrolet-Malibu-12623095/1738801957.html /your factory knock senor migh be frequency filtered which might mean its hard to tell ifits working until you get knock. wideband one picks up all vibrations. wired into a headphone jack and then plugged into the laptop. In my case I had to turn off software processing on the output so that it was in realtime and not delayed by a second or so. Quote Link to comment Share on other sites More sharing options...
0R10N Posted September 21, 2015 Share Posted September 21, 2015 Ah. No integrated knock sensor anymore, I'm purely "setting and forgetting" here. So the laptop acts as an amplifier of some sort? Basically I'd like to hook up a pair of headphones and listen for knock while tuning. /might go scratch around the EFI thread to see what's been posted before. Quote Link to comment Share on other sites More sharing options...
Roman Posted September 21, 2015 Author Share Posted September 21, 2015 Yep so you wire in the knock sensor as an input to laptop with headphone jack. Use the laptops amplifieer in the sound card to output it to headphones. Then works sweet. 1 Quote Link to comment Share on other sites More sharing options...
downtrail Posted September 21, 2015 Share Posted September 21, 2015 Another method ive been playing with is using the g4 tuning software alongside with head phones to look for knock they have this feature where you do the same ie wire in a wideband knock sensor to the mic input but the graph changes colour when it hears knocking if its in the frequency range for your motor. Theres calculators on the net to work it out. Seems to work ok but its hard for me to trust it over my own ears. Quote Link to comment Share on other sites More sharing options...
Nominal Posted September 21, 2015 Share Posted September 21, 2015 Lots of good ideas for knock sensors on autospeed. http://www.autospeed.com/cms/article.html?&A=113153 Quote Link to comment Share on other sites More sharing options...
sentra Posted September 21, 2015 Share Posted September 21, 2015 https://upload.wikimedia.org/wikipedia/commons/1/17/Wave_dynamics.gif[/img] cool image - thanks for posting Quote Link to comment Share on other sites More sharing options...
h4nd Posted September 21, 2015 Share Posted September 21, 2015 That gif doesn't show momentum effects, though, which are a big deal in 2T engines (and turbines). Quote Link to comment Share on other sites More sharing options...
Roman Posted September 21, 2015 Author Share Posted September 21, 2015 Not sure what to think about that one. When the valve shuts, why does it show the runner gaining air density from the valve end? A reflected pressure wave is a bit different to gaining a mass of air out of nowhere. Quote Link to comment Share on other sites More sharing options...
Ghostchips Posted September 21, 2015 Share Posted September 21, 2015 My thought was in the animators mind the low density air retained momentum until it hit the valve so built up to atmospheric pressure fron the valve end. Or it was easier to animate it that way. 3 Quote Link to comment Share on other sites More sharing options...
Roman Posted September 21, 2015 Author Share Posted September 21, 2015 Oh yep that makes sense. Quote Link to comment Share on other sites More sharing options...
Rookie Posted September 22, 2015 Share Posted September 22, 2015 And that is actually how it works. Quote Link to comment Share on other sites More sharing options...
Testament Posted September 22, 2015 Share Posted September 22, 2015 not quite, it will "fill up" the pressure/density from both ends to some extent Quote Link to comment Share on other sites More sharing options...
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