Mazda Rotary Club

General => General Technical => Topic started by: interloper393 on June 27, 2005, 11:17:51 PM

Title: What does porting do?
Post by: interloper393 on June 27, 2005, 11:17:51 PM
Can someone plz tell me what having the engine ported does and how much it costs plz lol
Title: What does porting do?
Post by: Brett on June 27, 2005, 11:22:49 PM
Porting increases the size, and thusly the time the port is \'open\' within the combustion cycle, this allows more air/fuel (if the porting is on the induction side) mixture to enter the engine and faster expulsion of the exhaust gases. (exhaust side)  
Thats just a very basic overview, I think its 90% right too! :D  Also bear in mind that larger ports extend the time the port is open which has other knock on effects :wave
Title: What does porting do?
Post by: Brett on June 27, 2005, 11:24:36 PM
As for cost, how long is a peice of string?  Porting requires a full strip of the engine and a steady hand. Ametures can easily cut into the water jacket, so its a skilled job.
 Type in \'porting\' in the MRC search function and have a read, you should get an idea of prices there too.
Title: What does porting do?
Post by: interloper393 on June 27, 2005, 11:29:06 PM
Kewl cheers bud, well the cars in for a full rebuild and someone suggested i have it ported while its there, the engines getting sent away for the rebuild and im sure its Jimmy thats doing it :).

So does porting give you more power then? but a use alot more fuel? lol not so good on the techincal side lol
Title: What does porting do?
Post by: Brett on June 27, 2005, 11:32:12 PM
Basically, the more air you can flow, the more fuel vapour it can contain.

More air and fuel = more power (its a little more complex than that, but you get the drift)

I cant say what it will do to the fueling, It depends entirely on each individual application.
Title: What does porting do?
Post by: interloper393 on June 27, 2005, 11:36:05 PM
Nice!! cheers for that :)
Title: What does porting do?
Post by: sadgoth on June 28, 2005, 08:22:04 AM
depending on the severity of the porting, it will also affect the way the car idles. Mine \'hunts\' between 800-1500rpm on idle but I have a reasonable sized bridgeport on the secondaries and a fairly subtle street port on the primaries. See: http://www.monito.com/wankel/porting.html for a simple (ish) explaination. It makes a big difference in how the power is delivered as well as outright power, my understanding - which is a little basic - is that the more extreme the porting, the less power in the low rev range you would have the power increases happen in the upper power band.
Title: What does porting do?
Post by: Spotlamp on June 28, 2005, 08:59:11 AM
Porting  costs around £500 if you\'re having your engine rebuilt for a street port.  In terms of fuel economy, the heavier your right foot the worse it is.  Suffice to say, any form of porting will potentially increase power, and more power means more fuel.

HTH
H
Title: What does porting do?
Post by: interloper393 on June 28, 2005, 10:08:43 AM
Ok just a few things before i decide lol.. if i get a street port, will i need to buy an uprated ecu unit? and if so what unit and how much will it cost me :)

What sort og bhp will i gain from a street port?
Title: What does porting do?
Post by: DrivingMachine on June 28, 2005, 10:48:34 AM
interloper whats your email? Wanted to ask a question about a previous post but cant pm  :cool
Title: What does porting do?
Post by: interloper393 on June 28, 2005, 12:23:24 PM
interloper393@aol.com

I dont know why i cant send pm, do i need to become a full member?
Title: What does porting do?
Post by: DrivingMachine on June 28, 2005, 12:27:45 PM
yeah, full members only, but got no money just graduated from uni and im broke!! Anyway, you have email  :D
Title: What does porting do?
Post by: interloper393 on June 28, 2005, 12:29:16 PM
Not yet i aint lol
Title: What does porting do?
Post by: interloper393 on June 28, 2005, 12:33:49 PM
Havent received any emails form you m8...
Title: What does porting do?
Post by: DrivingMachine on June 28, 2005, 12:35:20 PM
sent it, you should get it any second now....
Title: What does porting do?
Post by: Spotlamp on June 28, 2005, 12:50:57 PM
Depending on what mods you\'re running, you could probably get away with porting if you\'re running stock exhaust and induction.  Any increases in flow at either end (induction or down/mid pipe/catback) and you\'ll need the ECU to handle it to be safe.

HTH
H
Title: What does porting do?
Post by: interloper393 on June 28, 2005, 02:14:36 PM
Well iv got stainless exhaust from the middle cat backwards and twin air filters on her.. so if i port i no im gunna need a ecu :).. o well she`ll be better for it muhahahahaah!!!

Does porting make the engine sound differant in any way??
Title: What does porting do?
Post by: Ricco_04 on June 28, 2005, 02:28:08 PM
It will sound different - the more it is ported then the more it will brap - i think!  :D

I personally would have thought you should have an aftermarket ECU for the mods you have at the moment??
Title: What does porting do?
Post by: interloper393 on June 28, 2005, 04:35:16 PM
What i have at the mo is bang on the borderline for an ecu.. lol lucky me :)

But fancy a bit more Ooompff. so i reckon i cud go the street port road, i`ll chat to mark n see what his views are for a bit of backup  n go fae there :)
Title: What does porting do?
Post by: sadgoth on June 28, 2005, 05:12:32 PM
As I mentioned in my earlier post the engine will hunt if it is heavily ported (i.e. the revs will vary between about 600 & 1200) so yes the tone of the engine is likely to change!  :D
Title: What does porting do?
Post by: interloper393 on June 28, 2005, 05:33:22 PM
Quote from: sadgothAs I mentioned in my earlier post the engine will hunt if it is heavily ported (i.e. the revs will vary between about 600 & 1200) so yes the tone of the engine is likely to change!  :D


is that u in that pic lol
Title: What does porting do?
Post by: sadgoth on June 29, 2005, 08:22:51 AM
no that ain\'t me, I\'m a bloke!

(she is fit though  :chat that Rose McGowan!)
Title: What does porting do?
Post by: interloper393 on June 29, 2005, 10:05:30 AM
Thats her out of charmed?? my my my she is one fine lookin young ladeeee!!!! GRRRrrallll!!!