Kinked_Chrome
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Posts posted by Kinked_Chrome
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yeah, the welds on them really stink. The material I used was .063" 5052 Al. Made it really easy to form, but rather difficult to weld. I think that I will sand all the welds down and run a new nice bead around so I can keep the pie cut look. If I had to do it all over, I would use .090" and make it out of five sections instead of eight.
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I started working at a place where we take hour lunch breaks, a luxury I never had before, and I started getting bored. I also get to use all the machines basically whenever I want. I was looking to work on my metal forming and aluminum welding skills and I'm a little sick of the of the rubber intake elbow on my LT1 so I decided to build a pie cut style one. I started out with a little help from solidworks.
Then I ended up with these.
And formed and welded it into this
Not quite sure what type of finish I want to put on it yet. It will likely just get powdercoated.
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I hate to be so critical, but i think that you are wasting your time. I'm not exactly sure what you are trying to figure out with all this engine building data. Are you just trying to come up with a way to estimate horsepower output? Or looking to see how cam and cylinder head profiles affect output? I'm sort of lost at what your trying to do.
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Bam, that's my problem with all of your theory, right there. In my opinion, that is a horrible assumption. So if you take one of the original 36hp VW Beetle engines, boost it to 10psi (assuming the motor holds together), you're magically going to add 147hp, for a total of 183hp?
Your equation seems only to work on v8's around 400-600hp, because those are engines and power levels where adding 1psi may indeed add 14.7hp, but that is merely a coincidence.
this is what i was trying to get at. It is merely a coincidence. It is not an anomaly.
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the stoichiometric ratio of fuel to oxygen as it's mixed in the engine that matters! So, if your going to make a point then we have to do it correctly. If gasoline is run at its preferred maximum power air/fuel mixture of 12.5:1, it will release approximately 20 MJ (about 19,000 BTU) of energy, where ethanol run at its preferred maximum power mixture of 6.5:1 will liberate approximately 25.7 MJ (24,400 BTU), and methanol at a 4.5:1 AFR liberates about 29.1 MJ (27,650 BTU), that is why oxygenated fuels make more power and VP and others are making oxygenated race fuels. It gets even better when you run Nitro!
I think you you also sould point out the fact that methanol has only about 40% the energy density of gasoline. 19,800BTU/lb for gasoline and ~8500-9000BTU/lb for methonal, as i recall. Then ethanol is around 14,000BTU/lb.
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Higher octane fuel contains less BTU/gallon than lower octane fuel. plain and simple.
Just curious, but where did you get this info, and exactly how much less btu/gallon are you talking?
I was also curious about the octane rating system being different, if anybody had more info on that.
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Wow, it seems like you have put a lot of thought into this. I think you guys are trying to make this more complicated that it actually is. With out any units attached to anything it took me a little while to figure out what was going on, but here is my take on things.
The first equation
CFM flow x cylinders x .257 = HP
I think this one is great, in about to seconds you can guess the HP of a high performance engine. the constant .257 i assume is determined with the energy released in gasoline at max power rich formula, an average rpm, and an average efficiency of a high performance engine, constant air intake temp, yada yada. basically a "guess" of what all other variables are gonna be.
The second part
Boost in PSI x 14.7 = additional horsepower. All this means is that you are assumming that on average you gain 14.7 HP per PSI of additional intake pressure. Which is why your numbers are different for intercooled and non intercooled setups. i'd be willing to bet for non intercooled lower boost (3-6psi) you're only going to see gains of 12-13 HP/psi and on the much higher performanace applications (intercooled and what not) your more likely to see 16-17+. I think that your equation would be more useful for determine how efficient a turbo setup is, rather than guessing HP. Instead of guessing HP you turn it around and solve for HP/psi
For example:
start with a 300 HP NA engine
and you get 450 HP turbo charge with 10 psi
450-300 = 150 HP/10psi = 15HP/psi
now let say we add an intercooler and get 460HP and our boost drops to 9psi
460-300=160HP/9 psi = 17.8HP/psi
Does anybody see what I'm gettting at or am i just rambling on?
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do the t5 slaves bolt on to the t56 or are modifications required?
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are all stock T5's slaves the same? I'm doing the same swap and was headed to the art store, but don't know what make/model car to give them? Fox body mustangs? 4th gen f-body's?
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Do it! One of the most rewarding experienced in my life was helping start an FSAE team at my university. It's a wonderful experience. 5 years later they are still going and getting faster all the time.
I want to so bad, but it's difficult to get support. We pretty much get no funding from the university and have to do all the fundraising for our selves, not to mention I have to convince my fellow baja members that it's do able. I'm confident that it'll happen, so hopefully in a few months I can be posting pics of the FSAE renderings, instead of the baja.
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There is a lot of bending loads on that lower rod end... threads tend to fail when placed in bending. I would suspect that the lower rod end failed first' date=' causing the other parts to fail a bit later in the impact.
You'd get ripped apart for doing that in FSAE, not sure how stringent the judges are in baja in comparison.[/quote']
good call. they both looked like they bent and broke rather than shearing off. I don't think they are quite as harsh in judging as FSAE, but I guess i will find out in a couple days. Next year I hope to tackle the FSAE, it'd be a first for Boise State.
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Is the lower one the heim joint you broke?
it was both of them and the steering bolt all at the same time. It came off a 20ft gap and 5-6ft drop all on the one wheel when it was cranked to the right. I think that it was pretty much a worse case scenrio. Oh, and it bent the spindle on the that one as well.
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Thats awsome. But one thing, I know that, that is a model to show suspension but how would the drive line be hooked up? I would see youe needing telescoping half shafts.
yep, that is exactly what we have. Last year we ran CV's that slipped in the joint itself, and they failed. This we year we are still running CV's but we robbed some parts off a half shaft and built a telescoping CV axle.
Mario, don't worry about getting your beat to bad. We've test driven it twice and broke it twice, so much for our FMEA. Of course we've been driving it to the absolute maximum.
List of broken parts includes:
2 .5" high stregth heim joints
1 bent front spindle
1 sheared 7/16" grade 8 bolt from our steering
1 really bent steering arm.
In my experience though, the course won't provide anything Like what we've been putting out cart through. But we shall see.
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I used to love solidworks, but after this year i used it so much for designing our mini baja it's basically second nature to me now. I doesn't quite have the excitement it used to. COSMOS is rather handy, you guys need to give that a try. Here are some renderings of the '06 Boise State Mini Baja that i did.
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Sorry if this is a repost, but i couldn't find anything about in the search. I was having a discussion today with one of my buddies about which engine configuration would make more torque, all things equal, and only considering the configuration. My arguement was that the inline would. Based on that they can have a longer stroke, because they are not restricted by having an opposite side. He tried to tell me that the angle of the pistons in relation to each had more to do with it. What do you guys think?
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It's been a while since i've posted here, but as i recall most of you aren't nascar fans. so here is an online petition for speed channel to air more non-nascar related shows, and to not be the official nascar channel. Let me know what you think.
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I don't understand why it has so many bends welded together. Why not just use mandrel bender.
i think that Ti is also too brittle
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i just can't believe the thing is FWD. When i heard honda was building a 1/2 ton rated truck i was hoping they'd make a a real V8 rear drive platform. Instead i feel like they put a truck body on a Honda odyssey chassis and gave it 4 wheel drive..
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it does sit well with me because it seems fundamentally wrong. "smaller" engine in a "bigger" car. but i love it because it's a great way for the import guys to give a big fat middle finger to die hard domestic enthusiast; very well proven on the svt forum. can't wait to see F&F3 either, those movies may be really corny and cheesy, but they never fail to entertain.
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here a couple pics of a 700cc Polaris cart i built in high school....Dubbed "The machine of Death"
sorry they are kinda dark, but you can see the 700 and the tiny *** go cart.
http://album.hybridz.org/showphoto.php?photo=2823&cat=500&page=1
http://album.hybridz.org/showphoto.php?photo=2822&cat=500&page=1
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the warning label on those compressed air cans is funny. reads something like "not considered flammable, but will ignite under certain circumstances"
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Do you guys know of any good duramax forums? All my buddies keep busting tierods on there chip duramax's and i'm looking for some decent forums for good info. thanks
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the trick with the red x is to see the image
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i can only make it to 6 or 7 then i had to look up the answers. the clue for stage three is to remember the old magic books.......3D art.
Lunch time pie cut project
in Fabrication / Welding
Posted
No idea. This project took me about 4 lunches. So whatever that works out to. $100 or so.
I drafted the entire thing in Solidworks, and then the software will make a flat pattern for me.
Unfortunately the software is not freely available. However if your a college student or know a college student you can get a year subscription for ~$140. instead of $10k-$15k
You sir are correct. It was cut on a maxiem waterjet