Porting Polishing

[Mr.Corolla]

Is it posible to port polish a 1.3 engine? i want to free up the horses or add a couple, just wondering if porting polishing is possible on a little engine or is it a case that it can be done on any engine (by a pro not me) Also fabricated headers are they possible? One job on this car seems to spill out even more jobs and research.
Any ideas just post summit or send me a private msg.
Cheers

[drdisque]

you can port any head or intake manifold

[KC Ron Carter]

Here is a good example of a real deal.


http://www.ag.auburn.edu/users/gparmer/articles/neon/








Most of the real deal tuners use surface turbulance and little polishing.

[curtis73]

Yup. Porting and polishing are standard performance ideas that apply to almost any engine.

Keep this in mind, though. Port design and shape are as important as peak flow numbers. Increasing flow does not necessarily increase streetable power. Its complicated, but the best scenario is if you have the smallest possible port with the most possible peak flow. The reason is velocity. The more velocity you have, the more torque you have. The more flow you have, the more Hp you have. Therefore the optimum combo is to have good flow from small ports.

[benchtest]

All engines respond to better breathing. Porting is a good place to start, but remember, what goes in must come out. Very few shops polish anymore, however, should you want to experiment yourself, do not polish the intake port. Without a boundry layer of turbulence the fuel will drop out of suspension and gather on the walls. Velocity is important as Curtis pointed out, but beware of going too small. Any good shop will know this, but as an FYI, you can run into a sonic choke. The numbers on the bench will still increase, but the engine will not breath as expected. Headers can be made for any vehicle. I was on a project where custom headers were made for a 3 cylinder! Cad design and all! I think it was a Geo engine, but I don't recall exactly. Bottom line...more airflow is always good for power, as long as it is in a usable rpm range.

[Mr.Corolla]

Cheers for that.. i'll see if i can get a port polishing kit and then maybe me and my dad can assult the engine. Hopefully he'll be up for a bit of polishing and i can get it done.
Cheers again

[CBFryman]

as benchtest said, polishing the intake port post injection may actually harm flow and there for power. the small pores inthe metal trap small particles of fule resulting in fule staying atomized and a slick layre for gasses to flow on. but pre injection and post combusion chamber and combustion chamber polishing will help with flow and help prevent hot spots.

[Kven]

actually the pores in the intake are for aerodynamic reasons. i saw an article complete with pics that explains it all awhile back but dont have the link. think of golf ball; they have pores.