Porting on twins?

[Bobbit]

Hi guys,
Just wondering if there is much point in getting an engine ported if you\'re still running seq twins?

[leon]

Why yes there is, you can make more power and i belive it will spool a tiny bit quicker?. it\'s also future proofing as you would want to port your engine if you ever went single and if your engine is out it would be a shame not to do it at the same time :mmmm

[Bobbit]

Cheers leon, i thought as much but my brain was doubting itself.

[rx7boy]

Yep sure will, I have an aggressive street port and my twins are running non sequential and lovely smooth power all the way !! plus if you do it now you wont when u switch to single !

[Aceman]

Same here - agressive street port, exhaust port etc..

Makes a very nice car to drive!!

[chrisJDM]

yes its a great idea to get porting on twins will make a bit more power, just dont go too big on the ports as you may get boost creep

[HaywardRotary]

you wont get boost creep from porting,maybe other things but not porting.
Regards
Carl

[Ada7]

Whats boost creep?

Adam

[Kevin]

Extra unwanted boost spikes, normally as a result of making things more free flowing.  For example the addition of a downpipe with no adequate boost control support.

[Grizzly]

Actually, do i have this the correct way round??? Creep is when you are in 4th gear at wot so there is quite allot of load on the motor, the boost will slowly rise over the target boost setting and not drop back until you let off?

Spike is where your in a low gear say first and you floor it, the boost rises quickly and overshoots the target level then starts to drop back.  

Does this sound correct or have i got it mixed up?

[skybusr34]

sounds bang on to me Grizzly

[ryan_v]

i concour grizzly lol

[Nik da Greek]

Yeah, you\'re right, Grizzly. Creep is usually caused by crap wastegate design not being able to shift the gas quickly enough so it continues to load up the system with loads of extra pressure quicker than it can get rid of it, and the worse it gets the more it happens . Spikes happen when the system\'s a lot more free flowing than the boost control loop can cope with, so it can\'t reign boost in quickly enough and overboosts.

....that was a really terrible attempt at explaining it, hope it makes more sense to you guys than it did to me reading it back :3Confused

[yappa]

how much does porting roughly cost?

[L18M]

around £350-£500 maybe more depending who does it and what kinda of ports..
but if u port u cant just port on its own.. as block needs to come out, seals would have to be replaced etc...