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  #16 (permalink)  
Old 07-03-2013, 02:16 PM
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Quote:
Originally Posted by oldbogie View Post
I'm very impressed, going to have to take another look at Howards cams.

Bogie
I too was very impressed with the grind. For anyone that is curious this is the cam part number 180325-08. I have also attached a picture of the BSFC throughout the run.
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  #17 (permalink)  
Old 07-03-2013, 02:20 PM
How fast is fast enough?
 
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ran it on E85?
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Old 07-03-2013, 03:01 PM
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Originally Posted by ap72 View Post
ran it on E85?
No 93. He said the A/F ratio on there is not correct and you have to add about 2 points to it.
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Old 07-03-2013, 03:15 PM
How fast is fast enough?
 
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Originally Posted by zildjian4life218 View Post
No 93. He said the A/F ratio on there is not correct and you have to add about 2 points to it.
you do realize that if one of the data sets is off then the rest are suspect as well right?

Damn shame too because its such a simple build yet has a lot of potential (I hope!). Well, when you get it in a car and start driving it at least you can report mph, et, mpg, and cranking compression. Those things can say a lot too.
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Old 07-03-2013, 03:21 PM
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Originally Posted by ap72 View Post
you do realize that if one of the data sets is off then the rest are suspect as well right?

Damn shame too because its such a simple build yet has a lot of potential (I hope!). Well, when you get it in a car and start driving it at least you can report mph, et, mpg, and cranking compression. Those things can say a lot too.
Are they? What if he knows the others are consistent and just the O2 is off? Since that is the one he had mentioned was not consistent I guess I don't understand why you think that.
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Old 07-03-2013, 03:34 PM
How fast is fast enough?
 
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Are they? What if he knows the others are consistent and just the O2 is off? Since that is the one he had mentioned was not consistent I guess I don't understand why you think that.
Because if he has faulty equipment then you can't assume any of it isn't faulty. His dyno could have easily been out of calibration as well thus causing it to read about 25hp high... Or anything else can be off, your BSFC can easily be wrong and really looks very wrong for this kind of build.


Then again maybe it is a miracle engine and you'll be running 10's and getting 30mpg.

ET's and MPH will tell some of the story, mpg will help tell more.
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Old 07-03-2013, 05:32 PM
How fast is fast enough?
 
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If you correct your power by adjusting your bsfc to where it should be you're at about 390hp or less. Which is more in line with what I would expect from this combo. This test is pretty Fubar if you look at the results, they don't add up.
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Old 07-03-2013, 06:37 PM
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Originally Posted by ap72 View Post
If you correct your power by adjusting your bsfc to where it should be you're at about 390hp or less. Which is more in line with what I would expect from this combo. This test is pretty Fubar if you look at the results, they don't add up.
is SAE HP calculated using bsfc? I thought it was calculated using "ideal" atmospheric conditions and air pressure at sea level? What should the Bsfc be closer to? The plugs looked great maybe a little lean which the guy running the dyno had said you don't want to get the Bsfc below .32 so it was getting border line @ 6300.
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Old 07-03-2013, 09:07 PM
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Bsfc should be .4 for a near perfect engine, about .43 for yours. I calculated yours at .4 at your peak power rpm. That cam should peak at about 5600 in that combo though.
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Old 07-04-2013, 04:46 AM
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Originally Posted by ap72 View Post
Bsfc should be .4 for a near perfect engine, about .43 for yours. I calculated yours at .4 at your peak power rpm. That cam should peak at about 5600 in that combo though.
What about the HP numbers? How does adjusting the bsfc change the HP numbers? The SAE correction equation had no mention of bsfc in it. I'm pretty sure this is how it works. The dyno measures torque.... Duh. Calculated HP using the regular formula and then to find the SAE numbers it finds the correction factor and then multiplies the HP by that? How close am I? The net uncorrected HP numbers were around 380 I believe but that was only the first pull which went to 5000. Not sure after that.
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Old 07-04-2013, 06:44 AM
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This dyno sheet if way off A/F ratio not good, Volumetric efficiency is way off look at the air flow only 258, the dyno is set for 1000/RPM per second HMMMM

That dyno sheet in not accurate for sure.
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Old 07-04-2013, 07:45 AM
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Question to doubters:
If the dyno sheet is not accurate,should the O.P. get his money back for the tests?
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Old 07-04-2013, 08:27 AM
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Question to doubters:
If the dyno sheet is not accurate,should the O.P. get his money back for the tests?
Or redyno!!
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Old 07-04-2013, 08:57 AM
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Originally Posted by CNC BLOCKS NE View Post
This dyno sheet if way off A/F ratio not good, Volumetric efficiency is way off look at the air flow only 258, the dyno is set for 1000/RPM per second HMMMM

That dyno sheet in not accurate for sure.

What would cause all of these values to be off? Improper maintenance? One bad device throwing everything else off? Is the fuel flow off as well? I guess if the airflow is off which it definitely seems to be that would explain why the A/F ratio is off. I am not sure how the bsfc is calculated. Fuel flow/HP? If the fuel flow is off as well then that would explain the bsfc being so low. What do you mean by the dyno was set for 1000/RPM? I guess I need to have a good solid argument to go back on if I am gonna get him to redyno my engine. I mean the real reason why I had it ran on the dyno was to get the rings seated but it was nice to do a couple pulls as well.

Do we know that the hp is off or is it being assumed that since the other fields are off the hp probably is as well?

Also idk if the dyno is supposed to do this or not but when it took the engine up in rpm as it got towards redline it would rev the engine up and down? Is that intentional?
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  #30 (permalink)  
Old 07-04-2013, 09:08 AM
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Also I just noticed that the sheets say STPTrq and STPPwr. So apparently they are not SAE numbers they are STP whch is explained below


SAE -- The SAE standard applied is a modified version of the SAE J1349 standard of June 1990. Power is corrected to reference conditions of 29.23 InHg (99 kPa) of dry air and 77 F (25C). This SAE standard requires a correction for friction torque. Friction torque can be determined by measurements on special motoring dynamometers (which is only practical in research environments) or can be estimated. When estimates must be used, the SAE standard uses a default Mechanical Efficiency (ME) value of 85%. This is approximately correct at peak torque but not at other engine operating speeds. Some dynamometer systems use the SAE correction factor for atmospheric conditions but do not take mechanical efficiency into consideration at all (i.e. they assume a ME of 100%).

STP -- The STP (also called STD) standard is another power correction standard determined by the SAE. This standard has been stable for a long time and is widely used in the performance industry. Power is corrected to reference conditions of 29.92 InHg (103.3 kPa) of dry air and 60 F (15.5C). Because the reference conditions include higher pressure and cooler air than the SAE standard, these corrected power numbers will always be about 4 % higher than the SAE power numbers.

found it from this link Dyno Correction Factors (SAE/STD/STP/ETC) Explained - evolutionm.net

I am still curious as to what everyones opinion is on why all these numbers are low and how they effect each other.

Thanks for the input so far. Learning lots

Last edited by zildjian4life218; 07-04-2013 at 09:28 AM.
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