Remind me what the general exhaust gas temp should be ?....I'm fine tuning the carbs with a Pyrometer
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(EGT) exhaust gas temp?
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 the750sergeant |
(EGT) exhaust gas temp? |
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Posts: 1005 (03/25/08 6:12 AM) Senior Member |
You can't "Chop" when you keep adding crap...
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ToeCutter66 |
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Posts: 728 (03/25/08 9:15 AM) |
Is it a vintage 1970s Pyrometer? The calibration has changed since then so you will need to know which set of specs to use. In the 70s Jimmy Carter tried to
switch us to the metric system.
But seriously, I think you would be looking for consistency across all 4 cylinders, instead of chasing a specific value.
Cutter
Turning food into turds since 1966 |
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kev74 |
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Posts: 226 (03/25/08 1:13 PM) |
I agree with ToeCuter.
There are too many variables involved to try to find an ideal exhaust temp - ambient air temp, carb/jet setup, exhaust header wall thickness. I think a consistent temperature between all 4 cylinders along with reading the sparkplugs - after vacuum syncing the carbs would ensure you're going to get the carbs as good as they will get.
You know, this used to be a helluva good country. I can't understand what's gone wrong with it. - George Hanson, Easy
Rider
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the750sergeant |
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Posts: 1006 (03/25/08 6:18 PM) Senior Member |
Yep, I have them close to the same.....but it seems like there is always one carb that really has a temp diff on every set of carbs Ive ever
owned...lol....But I will say that my chop is running like a rocket regardless
You can't "Chop" when you keep adding crap...
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ToeCutter66 |
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Posts: 735 (03/26/08 6:44 AM) |
Hey sarg,
Wanna race that rocket?
Cutter
Turning food into turds since 1966 |
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71CHOP |
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Posts: 10139 (03/26/08 11:49 AM) G.O.T.F. Member |
don't forget that you'll have the inner two cylinders running slightly hotter than the outter two naturally........
I've bee considering using an oxygen sensor to jet. |
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FireHawk46064 |
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Posts: 2349 (04/09/08 7:51 PM) |
We'd use EGT in aircraft. Here's the general gist to it...
You use them to set engines to run at either Max Performance or Max Range. So let's say you want max range ... you wanna burn LESS fuel ... so you have a mixture control ...it's kinda like a fuel shut off valve... full forward = max rich ... more fuel = more cool ...it's opposite from what you'd think. As you pull the mixture control back towards lean ...it cuts off fuel ...more and more ...leaner and leaner... the EGT temp will rise as you pull the mixture back... the EGT rises and rises ... UNTIL IT REACHES MAX PEAK EGT. If you continue to pull the Mixture control back even more lean then the engine "starts to die" or "gets starved a little for fuel" and the EGT temp goes down or cools off ... you'd set Max Lean/Max Range at about +25 degrees cooler/less than peak EGT. Okay... Max Performance is exactly the opposite. Pull the mixture control back to find where PEAK EGT is ... and then PUSH / ENRICHEN the mixture FORWARD until it cools +25 degrees ...now the "extra fuel" is used to COOL below peak...and results is MAX PERFORMANCE/POWER either way ... lean or rich off of peak EGT means you get COOLER than peak. hope I made sense. I think if I were using EGT on bikes I'd be looking for hitting peak and then ENRICHEN a tad bit off peak. peace! Firehawk
If you can't tell it's not a Harley, I won't tell you it's a Honda.
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erthhipi |
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Posts: 111 (04/10/08 4:13 AM) |
FireHawk, would that be turbine engines or engines in general? (i would like to be able to use this info on a turbine project)
Huh? umm, Yeah.
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74rat |
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Posts: 4347 (04/10/08 5:46 AM) |
the750sergeant wrote: ======================================================================
lets say its a fairly hot day out, and your running a long distance on the highway, you should`nt exceed about 1150F max temp.....1200F, may give you more power, but may also have you running on the lean side of the correct stochiometric AF ratio of 14.7:1, (14.7 parts air, to 1 part gas) which may have your motor running hotter then it should be.. running "slightly" on the lean side of prime air/fuel ratio, is "less loss of power", then running on the rich side of the prime air/fuel ratio, so unless your planning on taking it out to the track for some racing, your much better off, jetting slightly on the "rich" side of the prime air/fuel ratio.. now, if your just wanting to check temps while setting there idling, I`m not sure exactly what your gonna get, I would geuss somewhere between about 400F and 600F, depending on how your low end carb jetting is setup ect... 74rat when in doubt..knock`um out...H.C.C.M.F LOCAL 6978 Flint Michigan..3rd most dangerous city in the USA..come back and visit us..sorry we "missed" you the first time..LOL |
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cntrhub |
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Posts: 1352 (04/10/08 7:00 AM) |
Toe had it more or less your hands are tied but it works out no matter what you use as far as a number. It is all about math I have no clue of...
Think the ideal 14.7 fool to air ratio is that physics of the gas anal lies ear. I'm just messing with one number of Hawk's and that 25 variable #. Do not take my word for this. Hawk knows way more than I and I am in the learning curve right now trying to work this out so you can sorta watch the fuel to air is me the fool trying out the abstract so I can understand it and you can sorta see where this is going as I split that 25 in half. Now I am at 12.5 fuel to air ratio. The stoichometric is that 14.7 premium if you were in a vacuum lets say. But we in here day bye day is that pressure/temp all over us. So say Hawk messes up the game with the reverse play when you again have to remember to say, 'the higher the number, the leaner the mix.' So when Hawk wants that hot to trot +25 past the 14.7 is me thinking that is that hot azz ride in the stoic lean is that cream in my cougheee waiting 4 year azz to get here stopping at way too many gas stations. I told you I'd bye and now yer cough be cold waiting too. But, set the needle up, the wide is the low screw, the final 12 to 13 to 1; just like Hawk mentioned is to slam that fat off the meat and damn that fcuker will bust Trans cases right and left on the power stomp. Yeah... Lean it up top will not bust it's balls. Ain't got that power flying the bubble in the vacuum popping there... You have that factory all messing wit year head and where they set the torque per stoic.... Get that fuel mix going and a mixing in year head yet? Set that screw lean is mean in my book. That just keeps walking there reading Hawk... Ain't no one taking BS here... Diss be one of them is threads me quantifying that gas temp, Hawk quantifying that gas temp, 74 sniffin that air temp out to far wit day probe and not the hot gas temp deep inside the pipe and it just makes so much sense to me... It falls in the absolute way use (turns around no one looking with a probe in hand), I would gain a big wood if I had a gas my anal lies ear worth it's salt in the cheap seats ear in my gear rage. You know any, guys? Gaz Anal Lies Ears? Don't wanna pay $300 plus for some box of $4 worth of diodes and dollop of merc in a tube bike wannabee proble. I know the bike one's are over priced. The Snap-On is $2K and you need more accessorie$ on top of that. I know Hawk is sniffing on some high dollar up that's plane's rear end is no laughing matter 20K high up, (now laugh). WOT say ye. |
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