Joined
·
367 Posts
What exactly does porting the cylinder head do? And would it be worth it to do it to a mostly stock engine?
How much could one expect to pay to have this done?
How much could one expect to pay to have this done?
What is this? "Tumble flap delete"aero_student said:no, it's not worth it all until you build the motor. the stock cylinder head is exceptional.
That may be so but my car jerks on the power at around 2900rpms. If I shift just after the power hits it feels very jerky for any passangers in the car..wickedgreyzx3 said:the tumble flaps are a good thing....
they change the length of the intake runners.
long at low rpms
short at high rpms
it gives for a much more even torque band
basically it is time to get rid of the tumble flaps when you build your engine to rev over 6,800 rpms and then you should just go with a cosworth intake manifold
what do you mean jerks.... at thoes rpms you are starting to get into peak power......The Mailman 666 said:That may be so but my car jerks on the power at around 2900rpms. If I shift just after the power hits it feels very jerky for any passangers in the car..
Wrong.wickedgreyzx3 said:the tumble flaps are a good thing....
they change the length of the intake runners.
long at low rpms
short at high rpms
it gives for a much more even torque band
basically it is time to get rid of the tumble flaps when you build your engine to rev over 6,800 rpms and then you should just go with a cosworth intake manifold
tampering with emissions ......Egz said:Wrong.
What you described was the variable runners. Tumble flaps operate at low RPM to create a tumble in the airflow to aide in air/fuel mixing for better emissions. When they are off, they are still an obsticle in the airstream, so by removing them, you sneak out a little more airflow from the manifold.
So how do I fix my dead engine below 2900 RPMs.Egz said:Wrong.
What you described was the variable runners. Tumble flaps operate at low RPM to create a tumble in the airflow to aide in air/fuel mixing for better emissions. When they are off, they are still an obsticle in the airstream, so by removing them, you sneak out a little more airflow from the manifold.
that is a function of a power band then. my car feels like a turbo kicks in at about thoes rpms, i've had people ask me if i have one cuz of the power band and the whistle from the caiThe Mailman 666 said:So how do I fix my dead engine below 2900 RPMs.
Man do you even know what the term "power band" means? Because i don't think you do. Please go ahead and explain your "power band" answer. Oh and just so you know I own a CBR900RR and know all about power bands and what they are. Trust me when i say that the boost in power around 2900RPMs is in part caused by something mechanical in nature. For one thing the power does not always hit at the exact same place in the revs. I’ve had it hit as early as 2500RPMs and as late as 3200RPMs so it is not solely based on RPMs. If I step on it from low revs I can get it to hit around 2500RPMs if I baby up the revs It will hit softly at 3200-3300RPMs. That is not how the power band of an engine works. Just in case you didn’t know a power band is not an “object”.wickedgreyzx3 said:that is a function of a power band then. my car feels like a turbo kicks in at about thoes rpms, i've had people ask me if i have one cuz of the power band and the whistle from the cai
Get an SCT XCal2 from Hypnotic or Marcy. The standard tunes should help you out. I've found on my D20 that -2 ignition timing helps maintaining low speeds in tall gears. I'm not sure if that will help D23's or not.The Mailman 666 said:So how do I fix my dead engine below 2900 RPMs.
good man.FocusFreak87 said:^^^That's where im getting my Xcal 2 from...