Questions, questions, questions. I did a search and didnt come up with anything, so I wanted to start a thread. What are the 'experienced' guys' opinions on valvetrain setups. It is my understanding that flow is one of the main components of an engine creating power. Based on that, I believe that if you can get the head to a max. flow (port and polish) you can increase the flow/power output. Also, if you can get the thing to rev as much as possible that helps too. So, whether my 'understanding' is debatable or not, is not the issue. The information im interested in is what is a great valvetrain setup in terms of valve size/material, cams (for turbo apps), springs/retainers, special mods (besides port/polish/deshrouding). I was motivated to create this thread after seeing this ebay auction:
http://cgi.ebay.com/ebaymotors...QrdZ1
Is this ultimate?
KA24DE-T ULTIMATE Valvetrain??
Re: KA24DE-T ULTIMATE Valvetrain?? (ace0073)
This has been covered Million times, some one here even took one of the heads and cut it in half to do tests.
Make sure when you do you'r search you select the Archived Option.
Thanks,Mike
SEARCH
Make sure when you do you'r search you select the Archived Option.
Thanks,Mike
SEARCH
-
Florida240sx
- Posts: 11114
- Joined: Thu Jul 01, 2004 7:17 am
- Car: 1993 Nissan 240SX Hatch 5spd
2012 Nissan Altima S coupe 2.5 - Location: DeLand FL
-
DRFT(kinda)
- Posts: 546
- Joined: Thu Mar 16, 2006 6:59 am
- Car: 2005 Nissan Titan.
Re: (Florida240sx)
V2's are better.Florida240sx wrote:BC and supertech are the topline. But I just went with the crower v2 cams and didn't need to upgrade anything else.
-
nissanfanatic
- Posts: 1314
- Joined: Mon Nov 01, 2004 8:41 pm
- Car: 1992 Nissan 240sx SE
- Contact:
Flow is the single most important aspect of an engine creating power.
But air does not flow into an engine like water flows from a hose. When considering flow into an engine, you must think of it as sine waves entering an engine, taking into account both amplitude and wavelength. This is a concern as the valves are constantly opening and closing creating a frequency. In this regard, port size must compliment the desired flow amount(amplitude) as to not be too large. If you just port a head to all hell's end, then air velocity will slow down resulting in a loss of power. It may be more than before, which can be misleading to most in saying that it is a prime setup.
Not only is head port characteristics important, but an engine's intake manifold must compliment the cylinder head. This is where the frequency I was talking about earlier must be a key consideration. Helmholtz theories are a good thing to study in this instance. Runner diameter and length must be perfect for the desired RPM at which you want to make power. So this becomes a question of how you want your car to behave.
With further modified race engines, exhaust manifold should be built in the same regards as the intake manifold to achieve maximum scavenging and producing maximum power.
With these two scenarios addressed properly, camshafts will simply allow more flow into and out of the combustion chamber.
The one thing that is not addressed enough with cam installs is cam timing, and this is mostly lack of a good way to do so..
But air does not flow into an engine like water flows from a hose. When considering flow into an engine, you must think of it as sine waves entering an engine, taking into account both amplitude and wavelength. This is a concern as the valves are constantly opening and closing creating a frequency. In this regard, port size must compliment the desired flow amount(amplitude) as to not be too large. If you just port a head to all hell's end, then air velocity will slow down resulting in a loss of power. It may be more than before, which can be misleading to most in saying that it is a prime setup.
Not only is head port characteristics important, but an engine's intake manifold must compliment the cylinder head. This is where the frequency I was talking about earlier must be a key consideration. Helmholtz theories are a good thing to study in this instance. Runner diameter and length must be perfect for the desired RPM at which you want to make power. So this becomes a question of how you want your car to behave.
With further modified race engines, exhaust manifold should be built in the same regards as the intake manifold to achieve maximum scavenging and producing maximum power.
With these two scenarios addressed properly, camshafts will simply allow more flow into and out of the combustion chamber.
The one thing that is not addressed enough with cam installs is cam timing, and this is mostly lack of a good way to do so..
