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Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
The calculator would not recognize I had completed the static compression calculation. It gave me that "error" message. So I turned on cookies and it worked after that. I have no clue why.
As far as temperature goes I always figure the engine operates at 5-10°F over the indicated thermostat temperature under load.
From testing I have done over the years with a fair number of thermostats on the stove with crude equipment they seem to open at their marked temperature +/- 5°F. It is kind of hard to hold the temp at that point to see if they will eventually fully open at that same "cracking" temp. What I need is some of that good chemistry dept equipment. One of these jewels would help on a slightly larger scale:
http://www.sci-bay.com/index.asp?category=9608&count=1
As far as temperature goes I always figure the engine operates at 5-10°F over the indicated thermostat temperature under load.
From testing I have done over the years with a fair number of thermostats on the stove with crude equipment they seem to open at their marked temperature +/- 5°F. It is kind of hard to hold the temp at that point to see if they will eventually fully open at that same "cracking" temp. What I need is some of that good chemistry dept equipment. One of these jewels would help on a slightly larger scale:
http://www.sci-bay.com/index.asp?category=9608&count=1
Last edited by Torque1st; Sep 6, 2006 at 07:53 PM.
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Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
Originally Posted by Torque1st
Ran the edyno at 210°F and ran the DCR up and down and it gave me the same results listing octane at 93 or better for DCR's in the range of 7.37 to 7.61 which seems odd.
Octane = (5.6 X DCR) + 50.
This is the link to the Octane data:
http://www.popularhotrodding.com/tec...eze/index.html
It does seem a little conservative to me.
Posting Legend
Joined: Sep 2001
Posts: 30,255
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Great link. Dave Vizard does some nice work. I had not seen that article.
The article says it is a mite conservative. I may have to graph that chart out and extend the scales a bit to reflect todays fuel just to have it in my library. Nice job on the equation. Thanks for giving a prime example of using math for something besides balancing the checkbook!
Interesting "list" at the end of the article. I have done many of those things in experiments and thru info from other sources.
I will have to study the article some more over the next few days.
The article says it is a mite conservative. I may have to graph that chart out and extend the scales a bit to reflect todays fuel just to have it in my library. Nice job on the equation. Thanks for giving a prime example of using math for something besides balancing the checkbook!
Interesting "list" at the end of the article. I have done many of those things in experiments and thru info from other sources.
I will have to study the article some more over the next few days.
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Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
If you just plug DCR values into the equation, it will give you Octane numbers from 50 to infinity.
I am considering just supplying the results of the one of the three equations for the three temperatures, instead of putting the results in 'bins' and supplying the bin.
Would that be more meaningful, or should I continue to report the Octane bin?
I am considering just supplying the results of the one of the three equations for the three temperatures, instead of putting the results in 'bins' and supplying the bin.
Would that be more meaningful, or should I continue to report the Octane bin?
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
I was going to put the graph on paper and stick it in one of my books where i keep things like that.
You could supply all three numbers and maybe even add an intermediate number for 200°F.
ie.
xx octane at 170 engine temp
xx octane at 180 engine temp
xx octane at 200 engine temp
xx octane at 210 engine temp
You could supply all three numbers and maybe even add an intermediate number for 200°F.
ie.
xx octane at 170 engine temp
xx octane at 180 engine temp
xx octane at 200 engine temp
xx octane at 210 engine temp
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Postmaster
Joined: Aug 2001
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From: Delaware
I will have to extrapolate the 200 degree equation, but it is doable. I am afraid of confusing the less informed user with too much information. That is why I used the 'Octane Bin' method to report the result.
Last edited by Torque1st; Sep 10, 2006 at 01:41 AM.
Posting Legend
Joined: Sep 2001
Posts: 30,255
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It looks as if all the lines are straight so a simple "b" term offset in the equation for the line would work.
The more info the merrier, but I know what you mean.
This is one place the simple mechanical engine controls we have for these engines really fall down compared to the computerized systems where you can index into tables for engine temp etc.
The more info the merrier, but I know what you mean.
This is one place the simple mechanical engine controls we have for these engines really fall down compared to the computerized systems where you can index into tables for engine temp etc.
Last edited by Torque1st; Sep 10, 2006 at 01:45 AM.
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Postmaster
Joined: Aug 2001
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From: Delaware
I don't think that the Octane curves are quite parallel. They seem to converge at an Octane offset of 50(DCR = 0). It is the slope that is different between the curves, but they are straight lines.
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Postmaster
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From: Delaware
I am working on the VE, from there the # of BTUs and Torque and HP are easy. The VE is difficult. I have two simulators that I can use as a baseline, but I don't have source code for them.
There are sites with equations, but none for VE, that I have come across. that is probably due to the complexity of that calculation.
There are sites with equations, but none for VE, that I have come across. that is probably due to the complexity of that calculation.
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
The guys that write the main dyno programs have been working on them for years, catching up will be difficult.
I have Desktop Dyno 2000 on my machine. I also have several previous versions and another dyno program that never worked well somewhere in one of many stacks of disks.
I have Desktop Dyno 2000 on my machine. I also have several previous versions and another dyno program that never worked well somewhere in one of many stacks of disks.