- Joined
- Apr 10, 2007
- Messages
- 2,876
Hey Blinx,
I've just bought the HONDA Bulider's Handbook written by Joe Pettite. It's got some serious depth on HONDA motors. Covers everything there is including FI.
I was reading and came to a certain Headline and thought I'd share it with everyone.
COOL INTAKE AIR is CRITICAL for NATURALLY ASPIRATED POWER
I'll just type out a part of what's under the headline because it aint long. It talks about RAM air as well.
You can actually make things worse with ram air. Ram air is a problem because it only works at a very specific mph. If you get the pressure in the scoop higher than the engine wants to take, a high-pressure area forms at the opening of the scoop and the air goes up and over it rather than going into the scoop. You have to calculate the air volume demand of the engine. On some of the F1 cars, openings at the bottom of the air box hold only a certain pressure. Then they bypass the rest of the air to bypass the rest of the air to avoid high pressure area at the opening of the scoop. A high pressure opening diverts airflow, and the engine doesn't flow as much as it normally would. Still, anything that gives you cold air, gives you power.
COOL AIR INTAKES
Cool air intakes improve the density of the intake charge becasue for every 11 degrees F(6 degrees C) that you lower the intake air temperature, your rewarded with approximately a 1-percent horsepower increase. Therefore, if your underhood temperatures are in the 165 degrees F(73 degrees C) range and it's 80 degrees F(26 degrees C), you'll get a 7.7 percent increase by ducting outside cool air to the intake. If your running 100 horsepower, that turns into a cool 107.7 horsepower. Free. Cool. Add to that the reduction in pumping losses from a free flowing filter element and it's a potentially a win-win bolt-on.
An NSX gained an extra 7whp on cold air intake.
Theres about 150 full big pages on every single part of the HONDA engine and what promotes and what doesn't etc etc.
I just shortly read that underdrive pulleys wouldn't gain much as Honda didn't leave much power on the tables.
Ok and another part I've found...
Dense air has more oxygen per vloume and will produce higher combustion pressure, hence a more powerful stroke. There's some arguement whether the air in the engine bay is that much hotter and therefore less dense once your up to speed. Another benefit to free flowing air intakes is they reduce pumping losses(friction) in the systemto free up power that would otherwise go to pulling the air through a restriction.
That's the difference between a long piped cold air intake and short ram intake. Basically, Short ram is like a free flowing system and longer pipes means more travelling time and restriction.
Cold air is densed so it does have more oxygen pre volume...
Geez, this was exactly what I ws talking about on the other thread when everyone was skeptical of my opinion... I guess my science and physics knowledge paid off.
If anyone wants to know the name of the book, it's High-Performance HONDA Bulider's Handbook. Volume 1. On Ebay.
http://cgi.ebay.com.au/High-Performance-Honda-Builder-Handbook-Vol-1-Civic-CRX_W0QQitemZ150118193435QQihZ005QQcategoryZ45572QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Theres Volume 2 as well. I might get it after I finish this one.
I've just bought the HONDA Bulider's Handbook written by Joe Pettite. It's got some serious depth on HONDA motors. Covers everything there is including FI.
I was reading and came to a certain Headline and thought I'd share it with everyone.
COOL INTAKE AIR is CRITICAL for NATURALLY ASPIRATED POWER
I'll just type out a part of what's under the headline because it aint long. It talks about RAM air as well.
You can actually make things worse with ram air. Ram air is a problem because it only works at a very specific mph. If you get the pressure in the scoop higher than the engine wants to take, a high-pressure area forms at the opening of the scoop and the air goes up and over it rather than going into the scoop. You have to calculate the air volume demand of the engine. On some of the F1 cars, openings at the bottom of the air box hold only a certain pressure. Then they bypass the rest of the air to bypass the rest of the air to avoid high pressure area at the opening of the scoop. A high pressure opening diverts airflow, and the engine doesn't flow as much as it normally would. Still, anything that gives you cold air, gives you power.
COOL AIR INTAKES
Cool air intakes improve the density of the intake charge becasue for every 11 degrees F(6 degrees C) that you lower the intake air temperature, your rewarded with approximately a 1-percent horsepower increase. Therefore, if your underhood temperatures are in the 165 degrees F(73 degrees C) range and it's 80 degrees F(26 degrees C), you'll get a 7.7 percent increase by ducting outside cool air to the intake. If your running 100 horsepower, that turns into a cool 107.7 horsepower. Free. Cool. Add to that the reduction in pumping losses from a free flowing filter element and it's a potentially a win-win bolt-on.
An NSX gained an extra 7whp on cold air intake.
Theres about 150 full big pages on every single part of the HONDA engine and what promotes and what doesn't etc etc.
I just shortly read that underdrive pulleys wouldn't gain much as Honda didn't leave much power on the tables.
Ok and another part I've found...
Dense air has more oxygen per vloume and will produce higher combustion pressure, hence a more powerful stroke. There's some arguement whether the air in the engine bay is that much hotter and therefore less dense once your up to speed. Another benefit to free flowing air intakes is they reduce pumping losses(friction) in the systemto free up power that would otherwise go to pulling the air through a restriction.
That's the difference between a long piped cold air intake and short ram intake. Basically, Short ram is like a free flowing system and longer pipes means more travelling time and restriction.
Cold air is densed so it does have more oxygen pre volume...
Geez, this was exactly what I ws talking about on the other thread when everyone was skeptical of my opinion... I guess my science and physics knowledge paid off.
If anyone wants to know the name of the book, it's High-Performance HONDA Bulider's Handbook. Volume 1. On Ebay.
http://cgi.ebay.com.au/High-Performance-Honda-Builder-Handbook-Vol-1-Civic-CRX_W0QQitemZ150118193435QQihZ005QQcategoryZ45572QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Theres Volume 2 as well. I might get it after I finish this one.