Matt,
Simply put, Lambda is a mixture ratio.
A Lambda sensor does not actually sample enough gases to give a true Lambda reading. It is a good tool, at a reasonable price, but it has limitations that need to be understood for best results.
Anyone can alter the Lambda reading displayed on a good...
I did not mean to urinate in someone's breakfast cereal. But there is a big difference in normal use and racing use when it comes to castor oil.
Yes. I have seen this gumming from castor oil first hand in engines running gasoline fuels, alcohols, and nitromethane mixes. I have also seen the...
Matt,
Please feel free to question any point I make - I am far from an engineer, and further from perfect. I can only relate from my experiences and limited knowledge.
Perfect stoichiometric conditions do not actually exist outside of the lab. It actually requires a specialized "gasoline" to be...
Travis,
For head flow data, on normal output engines under 2hp/cubic inch, multiply max camshaft lift CFM@28inches times .257 to give approximate hp per cylinder.
As specific output increases above 2.2hp/ci. the multiplier can change as ports become more efficient, but the above is good for...
This is a good discussion, however, there are times when all the best design elements, CFD analysis, and theory just do not work in the real world.
I have seen straight wall/limited radius (1/3 turn) bellmouth stacks outperform ones that perfectly matched Blair's work. And round stacks placed...
How are you reading AFR at 5.5:1?
Lambda sensors read very inaccurately at Lambda 6.86 and many controllers are off at AFR 10.0:1. Some do not accurately display even at much leaner mixtures. Any richer than this is questionable at best.
With many sensor heaters overworked at richer mixtures...
FWIW, almost all injectors will run fine at 5 bar/73 psi, and some will work at 7bar/101 psi. The Magneti Marelli Pico injectors are RATED at 10bar/145 psi.
http://motorsport.magnetimarelli.com/PDF/Fuel_System_Ignition_rev3.0_file/SF_IWPR_rev5.0.pdf
If you are forced to go up to 550cc...
Is you methanol enrichment mechanical or performed via engine management?
If you are running methanol as an enrichment or cooling fuel on top of a gasoline based fuel, your target Lambda for best power will change at different rates of methanol flow. This is just like running at ever-changing...
Are you more concerned with throttle bodies for individual runner throttles, or single throttle plenum systems?
Are you more interested in butterfly throttles, or other designs like barrel, roller, slide, shutter, etc.?
There is a good bit of information available from those who work with each...
