OMG! ConeDodger's Engine Case, is now ventilated |
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OMG! ConeDodger's Engine Case, is now ventilated |
McMark |
Apr 18 2009, 09:00 AM
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#1
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
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Rob just called me. Engine let go this morning in Stockton, on the way to the autocross. (IMG:style_emoticons/default/sad.gif) Sounds like a piston skirt broke off and trapped itself between the crank and case, and then blew its way out. Now he's got to wait for a tow truck. Ooooooh man. Poor Rob. I'm sure he'll have some pictures (with garbage cans) when he get's it back to his place. (IMG:style_emoticons/default/hissyfit.gif) (IMG:style_emoticons/default/barf.gif) |
jmill |
Jul 17 2009, 10:20 AM
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#2
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Green Hornet Group: Members Posts: 2,449 Joined: 9-May 08 From: Racine, Wisconsin Member No.: 9,038 Region Association: Upper MidWest |
This thread has had me thinking even more seriously about adding one to my next car/engine/exhaust build... I'm right there with you. I was dreaming up mounting the four gauges in my center console. A single EGT gauge wouldn't do it. It would be an average of all 4. I also run an AFR, but again it's an average. I'm thinking the best bang for the buck is to pay for the dyno tune. I do have to say that once I get my carb jetting dialed in I don't pay much attention to the AFR unless the engine runs rough. Oil temp, head temp and pressure are a different story. I check those as often as I check my mirrors. |
ArtechnikA |
Jul 17 2009, 10:44 AM
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#3
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rich herzog Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None |
I'm right there with you. I was dreaming up mounting the four gauges in my center console. A single EGT gauge wouldn't do it. It would be an average of all 4. I don't like that idea because you don't care about majority rule, you care about the one cylinder with the BIG problem. e.g. - one dead cylinder may bring the average down a bit which you may not notice. 3 at 600 and one at room temperature will get your attention... Blow-torch high EGT's from bad gas _should_ be across-the-board, but even if only cylinder were peaking for some reason you'd want to know, as we've seen. The piston exiting the case is the problem and you can take no solace from the n-1 remaining good ones... If you've got the bucks (and when we're talking about the cost of some of these engines it falls into the 'cheap insurance' category...) like the aircraft guys do, there are nice combo gauges that tell all. Do a search or go to Aircraft Spruce and have a look for "GEM" -- Graphical Engine Monitor. Shows CHT and EGT on a single multiple-bar-graph display. Since those guys are constantly monitoring fuel trims to achieve (something like) 50ºF lean-of-peak in cruise, it's really nice. I think you could get by easily with one AFR sensor per collector but you really need one CHT and EGT per cylinder. Finding a way to package the display for convenient dashboard presentation is a little challenge, but I think with a cheap 8051 microcontroller and an LCD display or some 10-segment LED bar graphs you'd have enough data to keep you out of the danger zone. |
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