I'd like to build a Vigas roof. Anyone provide any tables to determine the number of Vigas I will need? I'd like to have a 20ft span for them, and hope to use ~8" diameter aged pine vigas beams. For 40lbsf loading on the roof, how close would the vigas beams need to be to each other? 4,3,2 ft...
Finally found some pertinent research papers on the subject, to confirm my suspicion. Diesel fuel, although having a near ideal autoignition for my test motor (10.5:1 compression) to achieve HCCI, the very poor evaporative, boiling, and mixing ability of diesel makes it impractical. I'm likely...
In HCCI, the fuel is uniformly mixed with air, usually in excess of 3:1 over stoich, and compressed until it autoignites.
The fuel must match the compression ratio, or more exactly, the in cylinder temperature at a given point during compression. You want the fuel to ignite before TDC, but not...
First idea came here:
http://www.eng-tips.com/viewthread.cfm?qid=101322
Then, last night something occured to me. I was reading about pulsejets and it gave me a idea. In a pulsejet, the one way vanes in the front close during combustion, the exhaust gasses escape with high velocity ouit the...
#1 Using O2 gas like nitrous.
This I discussed a few months back, and it was concluded that the reason why oxygen isn't used like nitrous is on a spark ignited engine is that the additional oxygen concentration would greatly increase the tendency for pre-ignition. Basically, it would knock...
Here's a idea. Take a typical gasoline 4-stroke motor. Make a custom cam, that is also made and installed such that it turns at the same speed as the crank (2x normal). The cam timing would be something like this:
110ATDC, exhaust valve opens
140ATDC, intake valve opens
140BTDC, exhaust valve...
I'm sure some of you have looked at this:
http://www.meditech.ch/exoticthermoengineering/ete05.html
Can that be possible? I mean, 1L/sec translates to about 16GPM of 70% H2O2, to create 1500HP, with JUST the H2O2, no supplemental combustion using the liberated oxygen.
I know the turbine in my...
I was wondering if anyone here could comment (if familar) with the effective octane, detonation, and pre-ignition changes of adding 10-20% concentration (by weight) of nitromethane to methanol? Say compared to using nitrous oxide to achieve the same level of power enrichment?
I ask because...
Do modern champ car and/or F1 engines use a throttle?
I noticed they seem to be either in full power mode, or on some some of rev limiter. Coming out of the pits, they are bouncing off a rev limiter to stay under pit speed, rather than just having less power output from a mostly closed throttle...
Some of you may remember I have been looking into running my new motor on propane, and not using any sort of air throttle. Goal was to regulate power through fuel delivery, taking advantage of propane's excellent lean burn limits and near perfect atomization.
Before any testing I knew the...
Hope you guys can help settle a engineering argument.
Let's make the example very static to keep things simple.
Case 1:
3.0L motor, 6000RPM
25psi boost pressure
20psi exhaust back pressure
Making say 800ft/lbs of torque
Case 2:
3.0L motor, 6000RPM
45psi boost pressure (compounded turbos)...
I was thinking about all the things I need to keep cool on my engine.
1. Engine coolant
2. Transmission fluid
3. AC refrigerant (will be using AC to supercool liquid intercooler fluid)
4. Engine oil
5. Power steering fluid
So many things to mount up front and try and keep cool. Then I figured...
Anyone know if there are any fuel injectors I can purchase or obtain that can go to 120psi without exploding? I'd like liquid propane delivery, but normal gasoline injectors will just explode at the nessasary pressures. Diesel injectors may be my last resort if I can't find anything else.
I...
I'm creating this thread to discuss this one particular effect of water injection. Lots of attention is payed to intake charge cooling, and I understand that very well. But of particular interest to me is the effect water injection has on the relationship between BMEP (brake mean effective...
Been doing some reading of the "turbo bible" or sorts, Maximum Boost. There was a short spot on how great toluene is, being very high octane and acting as a effective burn rate accelerant. Mentioned it's use in the turbo F1 era.
Now can you say blend 25% tolune, 75% methanol, and that...
I have been running lots of simulations on a (I think) very nice engine simulator called "Engine Analyzer Pro" from Performance Trends.
Specifically, I did a comparison between longer (~13") runners and super short (~2") runners. What I found is most interesting.
At...
The CO2 idea I thought was bad, thanks to everyone here for comfirming it. Now I can inquire about something that may actually work.
Turbo will NOT be connected to exhaust. Turbine will have it's own dedicated "on demand" system.
As follows:
Combustion chamber, still unsure of size...
Came across a couple interesting experiments. One particular thing caught my interest:
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Full experiment here:
http://www.aist.go.jp/MEL/soshiki/ene/nensyou/shakal/CVC/CVCpage1.html
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Also mxiture tests with LPG...
Which of these equations which I have been given correctly describe the amount of work done by a turbine?
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W=work
PR=pressure ratio of turbine inlet to outlet
delta(v)=change in volume
W=PR*delta(V)
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POWER = { mdot * k * R * T1 * [1 - (P2/P1)^((k-1)/k)] } /...
A compressor moves a certain VOLUME of air. Even though most compressor maps list airflow by mass (lbs/min), it's actually a matter of VOLUME (CFM), that has been translated to mass by assuming a certain temperature and pressure (~25C and 1 atmosphere).
So, what this means is that a compressor...
