Celica Forums General Discussion Exterior Port and Polish?

I was offered a free port and polish due to the huge favors I did for a sport compact shop. I read the posts before about port and polish for both a GT and my GTS' engine and nobody knows of the gains. I'm just afraid to trust anyone with the engine even the Toyota dealership of screwing up an expensive motor. Should I go through with it because it's free and the shop is very good or should I not even bother because I'll have to leave my car for a day or days and the difference won't be noticed.

DO IT

ive talked to people with GT's, and they say that it makes a BIG difference

i want port and polish soooo bad, but it too much money for right now

you are LUCKY to be offerd that

There are a couple of things that should be mentioned. I have a GTS with only an intake. I don't know when or if I will get an exhaust or headers, for I'm sure those would help on gains if I went through with it. Nothing crazy on the port and polish either.

Just make sure they do a flow bench on your head to see if gains were actually made. If they don't have a flow bench, I wouldn't bother with them.

Thanks a lot for the info, but a never looked a gift horse in the mouth. I think if I went through with it and there were no signifigant or any gains and asked to have them do a more aggresive port and polish, then my luck would run out. They want to do me a favor, I don't want to push that. Maybe I should come up with something else like changing my "lift bolts" and or installing new anti-roll bars for free.

you are completely lucky, def. go for it

I say do it too. Dont see a lot of negatives about it.

my port and polish was awesome... also free

I can't give you numbers on the gains, but i felt it a lot Go for it

ugh hmm i heard once a Port and polish is done you won't be able to pass emissions, please correct me if im wrong.

Couldn't tell ya, Wyoming doesn't have any emissions requirements

Ha lucky you, well since i just traded my old celica for the new celica, wierd thing is old one had an emission sticker new one doesn't lol o well not gonna go get one unless i need it

why dont you just portmatch and port/polish the exahust manifold flage,runners and collector.someone did it before and got like 5 hp without doing the collector.the head is a little more tricky if they cant bench flow it to check if it actually flows more air.i would go for the manifold cause it will be a definate 5 hp maybe as much as 7hp if you do the collector.

I will keep that in mind in the future when I see them again. Thank you.

umm very nooblish question but what is port and polish?
do you mean clean the engine and somehow you get gains>?

http://www.alaniztechnologies.com/headterms.html

BACK CUT VALVE

This describes an additional angle added to the valve head to improve flow. Be aware different angles give different flow results at certain valve lifts.


BOTTOM CUT (throat cut)

The bottom cut is just as it sounds, the cut furthest into the valve-throat area. This cut opens the throat diameter to mate up with the main seating angle. On Honda B16/GSR heads, this angle has the greatest affect on mid to high valve lifts.



BOWL PORT/BOWL BLEND/POCKET PORT (They all mean the same thing.)

This is the most important part of porting a head. This place if done correctly will result in good Carbon FiberM gains. At the same time one wrong move here will result in a head that flows less than a stock. You cant make any mistakes here. Our flowbench testing has shown us what to touch and what not too. Most porters blend the short sides as common practice not realizing some of those edges are what makes the head flow well as we discovered on an Honda S2000 head. Bumps and sharp edges are not bad all the time. Once again flowbench testing helped us determin this.



CUT SEATS/GRIND SEATS

ALANIZ uses special carbide cutting tools to cut the valve seats. Grinding procedures are also performed because we have found carbide tooling doesnt always cut perfectly round on hardened seats. Carbide cutters have a tendency to jump when it comes in contact with hard spots. A simple way of checking a carbide cut is place the valve in the seat with no spring and look through the port while holding it with one finger. Look through the port. If you see light you know its not perfectly round. Thats were the stone comes in. We here at ALANIZ always come back and KISS the seats with a stone. The stone grinds away the hard spot leaving you with a perfect seal. On extreme applications such as supercharged, turbo, NOS engines there is no room for errors. Any gaps in the VALVE to SEAT contact area will result in a burned valve. ALANIZ pays special attention to these areas resulting in leak proof valve jobs. Knowing what angles to use is very important here. Honda heads are very sensitive to valve jobs. One wrong angle will reduce flow dramatically. When valve seatwork is performed, it's important to measure the installed height with an indicator. Setting all valves to the same height ensures consistency of combustion-chamber volume and helps equalize spring pressure.



FLOW BENCH

A flowbench is machine, which tells you how much air can flow through a port, manifold or throttle body. This machine is the most important tool when it comes to porting. Without one you will never be able to achieve the highest possible Carbon FiberM gains. All of our porting and valve job experience comes from utilizing a Superflow flowbench. It guides us in the rite direction by telling us if flow is gained or lost while keeping good port velocity. All Competition heads are flowed to make sure they perform flawlessly. ALANIZ heads are flowed @ 10 of water to simplify the math process involved. Most racing engines at full throttle produce aprox .5Hg or about 6.8 of H20. Superflow supplies us with a chart that helps us turn Carbon FiberM gains into real horsepower possibilities.



GASKET MATCH/PORT MATCH

All this means is equalizing diameters of adjoining runners. E.g. manifold to head. Most modern multi valve head from the factory come almost perfect in respects to the intake side. A light massage is all it needs.



LAP VALVES AND SEATS

A very light abrasive compound is use to lightly sand the valves into place. When ALANIZ performs its valve jobs it uses this procedure to check margin thickness only. We do not use it to cure an out of round, off center or just plain bad valve job as others shops may do. We vacuum check our work rights after the Valve job is performed then lap the valves in.



MILLING

This is a machining process that removes metal from the head-gasket-surface area. It purpose is to remove imperfections from the head surface. It is also used for increasing the compression ratio of an engine. ALANIZ checks both valve cover surface as well as the head gasket surface to make sure the head is straight before milling. Milling should never done if the head is bent. STRAIGHTEN IT FIRST then mill it otherwise uneven cam journal wear will occur. In a worst-case scenario the cam journal and cam will simply destroy it self.



MULTI-ANGLE VALVE JOB

A multi angle valve job is the cutting or grinding of 2 or more angles on the seat and valve. The purpose of a multi angle valve job is to improve airflow. By now you have probably heard of 5 angle and radius valve jobs. The truth|| this is more applicable in the American iron heads. There just isnt enough material in the small diameter seats or valves to see any real noticeable differences on a flow bench. A .5% gain maybe seen on a flowbench but the flowbench has a plus or minus error factor that has to be eliminated before a true flow figure can be attained. Older American iron heads may benefit from a five angle or radius valve job but only because the head is so bad to begin with. The Honda head is diffrent. Our flowbench testing has proven time after time that the correct angles and angle widths is whats important. More Carbon FiberM gains have been made through this procedure than applying 5 angles or radiuses.



POLISHING

Polishing a port or combustion chamber does not alter the shape or size, but instead smoothes the surface to increase flow and reduce the build up of combustion deposits. On the intake side of an ALANIZ port job we give it a rough polish. Why? Your fuel injectors work in milliseconds. Ever wonder in 8 milliseconds how many degrees your crankshaft has turned if it is operating at 9000rpm? Your crankshaft has turned approx. 450deg. That means your injector has to start firing fuel way before the intake valve has even opened. Most of the fuel does vaporize as it hits the back of the valve but the rest of the fuel that doesnt vaporize ends up on the walls, short sides and around the valve area until the valve finally opens and draws in the air fuel mixture. Keeping the walls rough in theory helps break up the fuel before it enters the combustion chamber. Atomized fuel burn better resulting in more horsepower and better fuel economy.



PORTING

Porting reshapes or enlarges by cutting, grinding, machining or in some cases adding material.



SHORT SIDE OR TURN

This refers to the shorter, tighter side of a turn in a port.



TOP CUT

The valve seat angle nearest the combustion chamber.



UNSHROUD THE VALVES

Removal of chamber material closest to the valve from the valve seat to the head surface. You would be surprised to find out that on some heads unshrouding actually hurts flow. Once again the flowbench testing helped us determine this.



VALVE GUIDES

A thick sleeve usually cast iron or bronze which helps guide the up and down motion of the valve. Guides are very important because if worn out they can cause valve instability and consume oil by letting it seep in to the combustion chamber.



VALVE SEALS

A valve seal is a seal, which helps oil not seep into the combustion chamber. It is positioned on top of the valve guide.

how much would a p&p cost on average?

^^ wonderin that to

depends on what the shop you go to charges

ok, then does anyone who has had it done know? or does anyone have a ballpark number? is it around $500 or $50000000, for example.

I'm guessing a good job can cost upwards of 500-1000. Depends on the quality of the job and how much is done.

Do it if its free ... you will not regret the gain. But make sure your air filter, extractor and exhaust is done first. You will about 15 max if that fellow is good.