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Head Air Flow
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Featured Article:
The cylinder head is the most important part in an engine where substantial time and effort is spent by a professional tuner. There is more power to be gained in correctly porting the head than in any other modification that it can be done to an engine.
Cylinder head porting is the process of grinding material from the ports and chamber of the cylinder head to increase the airflow and thus improve performance of an engine.
The flow efficiency of the head will determine the horsepower potential that an engine can achieve and by correctly porting the cylinder head, higher level of efficiency is achieved and the engine will extract more power.
The cylinder head consists of three important areas which are the intake section, the combustion chamber section and the exhaust section. It is very important that all three sections are modified to work in conjunction with one another as power will suffer and engine efficiency will decrease considerably. I cannot stress this enough as every day I come across ruined heads after being ported badly and my point is that it is useless to have a huge high flowing polished inlet port and the combustion chamber is all shrouded and will not burn it efficiently or the exhaust port does not flow enough air or has a bad shape or the inlet/exhaust flow ratio is out as the engine will not produce more power or even worse decrease its power after being ported.
Another important topic is engine characteristics. Cylinder head porting needs to be accustomed to the usage that the engine will operate at. A head modified for drag racing operating between 7,000 and 10,000rpm will be useless to a rally engine needing more midrange torque and operating between 3500 and 7500rpm.
When a new client comes to our workshop for a porting job we ask several questions so that we can tailor the porting appropriately the type of driving the engine will operate in.
If the engine is going to be built in house then we know most of the answers but if a client come with just the cylinder head than we need to make sure to have all the required information so the cylinder head porting will be done accordingly.
Just to give you some idea these are some of the questions that we ask:
a) Is the engine for street use, off-road/rally, circle track or drag racing?
b) Is the engine normally aspirated, turbocharged, supercharged, NOS, or a combination?
c) Engine size, Bore, stroke, connecting rod length?
d) What type of fuel is going to be used? Pump fuel, racing leaded fuel, alcohol?
e) Is the engine carbureted or electronically fuel injected?
f) Will the car have a full exhaust system or open headers?
g) Is the camshaft still stock, and if not we need full specification.
h) What is the weight of the car and type of transmission and gearing is used? Manual, auto, sequential?
i) ....etc
After all the questions are answered then we can start the cylinder head analysis and port the cylinder head accordingly.
Johann Scicluna is a professional tuner and has been building racing cars for the last 17 years and has a great passion in drag racing, hill climbing and off-road racing.
If you found this article helpful, feel free to visit our site http://cylinderheadporting.blogspot.com/ for more helpful articles like this one.
How to Choose the Best Low Flow Shower Heads
7 Things Besides Price to Consider When Buying a Low Flow Shower Head
You have many options when looking for a new low flow shower head. Recently I worked with a major REIT (Real Estate Investment Trust) with thousands of apartment units to help them find the best shower head that met the following criteria:
- Saves water and energy
- Provides a quality showering experience
- Is attractive and matches their décor and
- Is less than $40 each
After trying showerheads that cost as little as $2.00 each to as much as $40 each in several properties in their portfolio, we found there are 7 factors that make up a good shower head.
1. Pressure Compensating Technology
Many newer models have built in pressure compensating components so no matter what the water pressure is – as low as 20 psi to as high as 80 or 90 psi – the gallons per minute used and the feel of the shower remains fairly consistent.
Since water pressure varies from building to building and region to region this was a very important factor
2. Full Face Spray Pattern
The spray pattern is a major factor in a determining how a shower feels. What we found is that people overwhelmingly liked the full face spray with many nozzles covering the full face of the showerhead. This spreads out the water so that it doesn’t sting your skin like many of the cheaper brands we tested.
3. Aesthetics
Like many consumers my client wanted elegant looking shower heads without the cost associated with higher end fixtures. Fortunately there a many options to choose from that will match just about any décor including polished chrome and brass and brushed nickel.
4. Anti-clog Spray Nozzles
Showerheads with metal faces tend to clog up and deteriorate much faster than the newer rubberized showerheads. The flexible nozzles can be cleaned by running a fingernail across the surface while the water is running. This reduces maintenance time and extends the life expectancy of the equipment.
5. Uses under 1.6 gallons per minute
The maximum flow rate allowed by law is 2.5 gpm. One of the goals of our study was to determine if an even lower flow showerhead (there are a number available) could meet their criteria. Turns out a few did.
6. Non-aerating
Aerating is the introduction of air into the water flow path to enlarge the size of the water bubbles. This makes it feel like there is more water than there really is. Unfortunately the addition of the cooler air means that hotter water is required to maintain the same temperature.
Comfort (aerated) versus energy conservation (non-aerated). Luckily we found a few non-aerated models that provide a comfortable showering experience as well.
7. Energy Conserving
I have addressed 2 features that conserve energy – pressure compensating (at higher pressures more water is forced through the nozzles of non-pressure compensating fixtures wasting water and energy) and non-aerating technologies.
Another feature I found that conserves water and energy is a technology that turns off the water after it heats up during the warm up phase of your shower. When you are ready to step in just pull a chain and your warm shower is ready for you.
Many times when the shower is turned on in the morning you have to wait several minutes for the water to heat up. Most of us tend to turn and do something else and return when there is steam in the shower.
By turning off the water as soon as it’s ready several gallons that normally are wasted are conserved every time you take a shower.
We found that even though we had a number of showerheads that met 4 or 5 or even 6 of the criteria outlined above, only one met all 7. The Evolve Roadrunner Low Flow Shower Head. Here are the features and benefits that make it the best showerhead for my not only my client’s money but yours as well:
- 1.59 gpm flow rate
- Full face spray pattern
- Elegant look - comes in chrome or nickel
- Shower feels great even with lower water pressures
- Anti-clog spray nozzles – very easy to clean
- ShowerStart – see number 7 above
- Non-aerating – doesn’t add air to the water, uses less energy and still feels great
The best price I have found is $37.00 at Amazon.com. Search for Roadrunner Shower Head and sort by price – lowest to highest. If you’re looking for more than just 1 or 2 check out The-Energy-Conservation-Store.com and contact them for a quantity discount.
About the Author
Click here to go to Amazon.com
Mark Franklin is a nationally recognized energy conservation expert and holds 4 patents on water and energy conservation technologies. His clients include multi-family and hospitality building owners and management companies although many of his technologies and strategies apply to single family homeowners as well.
Mr. Franklin lives in San Diego, CA with his 14 year old son and can be reached at Mark@SavesYouEnergy.com or by leaving a message in the comment section below.
head/intake flow help!!! (revised)?
I have already posted this but i guess i wasn't paying attention to what i was typing, and i made completely no sense.
I have port matched my intake manifold to my heads. The only problem is that somewhere i screwed up my templets and now my intake manifold ports are bigger than the cylinder head intake ports, by about 1/13th of an inch. Would this ruin the flow of my cylinder heads(fully ported), since the air would hit that small ledge? And would it cause me to lose a decent amount of power?
And im not building a crazy fast engine, estimate will be about 380hp and 480ftb tq.
Thank, i just needed a little reassurance. And as for the first answer, I would do excactly that but I have a pair of J heads ported by one of the best in the US (which are said to be some of the best flowing) and i would be scared to death to touch them haha.
It will cause turbulence, which isn't necessarily a bad thing, mainly dependent on the combustion chamber design. 1/13th is about .080 I think, and that's a decent bit of overlap, but I honestly think you will be ok. Had you been able to match them perfectly, you would have noticed a difference in performance, but with an .080 lip, I think it will just cause turbulence (which is not really a bad thing as I said before) and I think you'll be just fine.
Italian trains, superconductors, the wonders of deodorant and rocks on strings
TORINO, Italy — The thing about Italy is that it teaches you to go with the flow.
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