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| Tofuball's '94 XFi; It's all about city MPG | |
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| Tweet Topic Started: Mar 12 2011, 08:59 AM (39,439 Views) | |
| Tofuball | Apr 29 2011, 05:14 PM Post #151 |
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Strange Mechanic
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| Tofuball | Apr 29 2011, 05:22 PM Post #152 |
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Strange Mechanic
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100MPG: If you could shroud the crap out of the valve, I think it may also keep gas from flying right out of the valve and onto the cyl walls and between the piston\cyl wall. . . |
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| 100MPG | Apr 29 2011, 11:34 PM Post #153 |
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very good point, i hadn't thought of that. but your right, the shrouding just may turn the mix down and make it fallow the piston. i'll have to consider that aspect in my design... you sir have just had a very very enlightening and significant thought.. thats genius level thinking there. Dana |
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| Tofuball | Apr 30 2011, 05:27 AM Post #154 |
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Strange Mechanic
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I donno if it's genius, but what might be is figuring what shape the edge of the CC should take, if it should be jagged (grooved) and how. |
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| 100MPG | May 2 2011, 12:34 AM Post #155 |
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i only bump you because i like you.... really.. it was quite a thought, i hadn't thought of it and i'm not exactly stupid, i can generally talk over most peoples heads. but i don't have the fuel sticking to the cylinder walls thinking that you have. thats not something that concerns me generally. you have to be careful with single thought thinking and not lose sight of the big picture. not to lecture or school you. but i know an absolutely brilliant man that can get stuck on a single thought or issue. once it was oil on the bottom of the piston not being able to escape being the problem. then next it was valve seat concentricity(sp) and spent a long time building a tool to measure it in like millionths of an inch. like absolute valve seal was the answer to any number of problems. he owns a famous race engine shop and knows things that i will never know, he just gets stuck on things. iv'e seen you mention fuel to the cylinder wall a couple times. just don't ever think that the answer is a single feature, event or phenomenon. never forget the big picture and that there must be balance in all systems. but at the end of the day, that was a brilliant thought and is a part of the big picture. but only a part............ Dana |
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| Tofuball | May 2 2011, 06:00 AM Post #156 |
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Strange Mechanic
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Thanks ![]() Actually, the last time I mentioned it I think it was the fuel stuck to manifold walls (Issues with TBI\injector far from port) vs fuel stuck to cyl walls (and hiding in the piston shroud) and a third place I haven't mentioned, it may collect on those ridges inside the chamber (next to the intake valve and around the spark plug and not burn cleanly. I think I've greatly reduced the first two as far as I can go, you're the one who gets to reduce the first by changing the cc shape ![]() |
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| 100MPG | May 2 2011, 09:47 AM Post #157 |
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this is tough play for us because i'm a racer looking for homogeneous mix. and you have this new thinking stratified mix thing with rich and lean areas and i'm not sure that there is that much control to be had. its a great theory, but i have to wonder if can be achieved with any repeatability because theres a lot going on in there and any change in rpm changes everything... ok, your stuck on fuel sticking to things...lol.. now if you can get it to stick to the plug while running lean, you might have something. it might just be the difference of trying to make it stick versus fighting the sticking... embrace the enemy and make it work for you. Dana |
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| Coche Blanco | May 2 2011, 10:08 AM Post #158 |
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Troll Certified
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Question: Why don't you guys do all this stuff to a newer engine? I feel like you may advance on 20+ year old technology, but you wouldn't advance on a current engine design. Does that make sense? |
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| 100MPG | May 2 2011, 11:33 AM Post #159 |
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jeez, to me this is a newer engine..lol... most of my stuff has been 60s-70s... but at the end of the day an engine is an engine and they all respond pretty much the same to mods. experimental test engines are generally only one cylinder. to me the reason for working with this engine is that its one liter and three cylinders. that makes it cheap to work on and if i want to experiment with heads, i can buy them all day long for $30. a one liter 4 cylinder would be more efficient because the pistons and rods weigh less. but mostly, i like the company here! and if i get one of these things to go down the road 70mpg at 70mph, i'll be kickin the crap outta the new stuff. Dana Edited by 100MPG, May 2 2011, 11:35 AM.
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| Tofuball | May 2 2011, 12:10 PM Post #160 |
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Strange Mechanic
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Because the "newer technology" is too expensive, has to be imported or modified to fit, and has different, more expensive compromises to overcome. The G10 is cheap, easily found, and can easily be updated and modified. Not so much for the Insight engine. The G10 has the best layout for what I'm doing, unless I'm going to import something. Also, I want others to be able to repeat what I am doing. Drill holes in your heads, install new injectors, drop in this computer, and get crazy MPG. Hopefully Supposedly I can pick up the head from the shop today. Edited by Tofuball, May 2 2011, 12:12 PM.
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| Tofuball | May 2 2011, 12:11 PM Post #161 |
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Strange Mechanic
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Yeah, a fouled plug, or a misfire!
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| 100MPG | May 2 2011, 12:24 PM Post #162 |
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yep, you'd need a hot coil or ignition.. plugs foul because the heat range is too low and don't run hot enough to keep themselves clean. i had considered this in my combustion re design, it may turn out that the shrouding may blow so much more cold intake past the plug that i may need to go up a couple heat ranges. i feel pretty much the same as you on the new engine stuff, i like simple and cheap and easy Dana |
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| Coche Blanco | May 2 2011, 12:28 PM Post #163 |
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Troll Certified
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That's what I thought. I'm looking forward to your progress. |
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| 100MPG | May 2 2011, 12:43 PM Post #164 |
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hey CB, wheres that weekend pedicure?... did you really man up and get the rainbow colors...lol.. Dana |
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| Coche Blanco | May 2 2011, 12:51 PM Post #165 |
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Troll Certified
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http://en.wikipedia.org/wiki/April_25%E2%80%9328,_2011_tornado_outbreak I've been busy with other things. I'll get one soon though.
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7:24 PM Jul 10