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  1. Replies
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    Narrowing down the number of ways to make a bad...

    Narrowing down the number of ways to make a bad car sure seem enticing, but when teams still put rod ends in bending, a weight rule or first drive video won't prevent failure. Time will find them...
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    There are some insinuations about the judges that...

    There are some insinuations about the judges that I don't think are fair. Keep in mind that many of the judges are engineers at the top levels of motorsport or within their industries, they have a...
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    Not to digress, but the 2014 Rolex 24 hours of...

    Not to digress, but the 2014 Rolex 24 hours of Daytona overall went to a car with manual sequential shifting in a series where pneumatic shifting is allowed. The car did have flat shifting...
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    Engine Development Designer - ECR ENGINES

    ECR Engines in Welcome, NC is looking to hire an experienced or entry level CAD designer in our Research and Development department. This would be a great opportunity for someone interested in...
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    I am under the impression reading several books...

    I am under the impression reading several books on turbos, google etc that turbochargers generally do not respond (are not sensitive) to A/R ratio on the compressor side. Most of the sensitivity is...
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    This forum has been quite dead during comp this...

    This forum has been quite dead during comp this year. Normally there would be 7 or 8 pages by Saturday night.

    The results are posted on sae.org under news
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    Don't forget about inertia. Multi-stage axial...

    Don't forget about inertia. Multi-stage axial compressors work fine at steady state, but have much higher inertia than a single stage radial compressor working at higher pressure ratios.

    I also...
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    Dyno testing is an accurate way to test for it...

    Dyno testing is an accurate way to test for it yes, but only with an electric transient dyno, which I assume you do not have access to.

    If you have a car, you could do a two coast downs from...
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    Great to hear!! You may also consider a 36 tooth...

    Great to hear!! You may also consider a 36 tooth wheel, which bosch also supports, or some of their other sensors. That way its not band-aided by a machined sensor which may impact reliability, or...
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    If the crank signal is weak, your wheel may not...

    If the crank signal is weak, your wheel may not be iron-y enough http://fsae.com/groupee_common/emoticons/icon_smile.gif, or your gap may be too big.
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    Well, loosing sync could be a number of things. ...

    Well, loosing sync could be a number of things. Sounds like the crank sensor has been investigated, but make sure the cam tooth is appropriately sized and timed for what it is expecting to see. ...
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    usually when I've seen misfires created by the...

    usually when I've seen misfires created by the coils, it's due to high cylinder pressure and too low dwell time. And, the Bosch ECU's have a table for both RPM and load (throttle position), so the...
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    Without going back and re-reading everything,...

    Without going back and re-reading everything, have you looked at the coil dwell times?
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    Well, good to see some people have brought us...

    Well, good to see some people have brought us back to earth a bit. We should all remember that absolute performance is irrelevant. It's a competition/race, it doesn't matter how fast you are (or how...
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    Look, I don't want to get into a pissing match of...

    Look, I don't want to get into a pissing match of performance can's and cant's, but it's pretty obvious that not one team has ever achieved 90KW, and I know several teams that have had cylinder...
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    Z, I appreciate your observation that FSAE cars...

    Z, I appreciate your observation that FSAE cars are slow to develop but do you expect them to have a linear progression in performance? I would say performance is more likely to go asymptotic with...
  17. Again, I'm pretty sure you are not seeing choked...

    Again, I'm pretty sure you are not seeing choked flow in your analysis, so the velocity is not maxed out. The definition of choked flow would be when the air speed is equal to the speed of sound.
    ...
  18. Looks good to me. They converge in mass flow in...

    Looks good to me. They converge in mass flow in your data and more than likely you just aren't going to fully choked flow otherwise they will converge completely.

    The point of the diffuser is not...
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    In Rob's defense, just because the strip is 1/8...

    In Rob's defense, just because the strip is 1/8 mile long doesn't mean the driver needs to do full 1/8mile runs. I believe there is a timing loop at 60ft and 330ft if the team intends to do multiple...
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    I gotta say, I was not expecting that much...

    I gotta say, I was not expecting that much difference in time for a few feet of staging difference, good catch.

    All this talk of surfaces, it would be interesting to see what a FSAE car would do...
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    Looks like Hungary has some good pavement, not...

    Looks like Hungary has some good pavement, not that I would be biased or anything http://fsae.com/groupee_common/emoticons/icon_wink.gif
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    One thing to consider as bearing width narrows...

    One thing to consider as bearing width narrows (split rod or even grooved bearings in modern engines) is the hydrodynamic wedge does not have an even load distribution. Near the edges of bearings...
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    Any chance any of those V12's are based on...

    Any chance any of those V12's are based on Straight 6's? Internet didn't turn up much, but there are other benefits to having no bank offset.

    Eliminates offsets in intake runners to a common...
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    I agree with Z's possible Harley scenario. Even...

    I agree with Z's possible Harley scenario. Even more plausible when you consider the forked connecting rod design where the two cylinders are directly in plane with each other. The crank pin is not...
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    I love adambombs graph. This shows the sacrifice...

    I love adambombs graph. This shows the sacrifice to a higher rpm engine quite well. Because friction goes up with RPM, you shouldn't expect to get the same torque at higher rpm, but ultimately...
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