Good work man! Those are the most bent valves I've ever seen! One time I saw a mazda motor[va] where the spring came off and the valve hit the piston so hard the head of the valve snapped off and the piston shattered.Peugeot makes a head[xn1p] with the worst ex. port design I've ever seen. The hardened ring of metal is called a valve seat insert the head is counterbored and these are pressed in. The valve spring seat would be where the valve spring rests on the head. Most of the time the ex seats are hardened and the int. seats are usually regular steel.

 

Great work!!! Thanx Random!

 

Could this be the first step in making a Naturally Aspirated monster??

With these numbers how well do you think we can increase the flow of the Beta heads? Cause we all know that is the achilles heel, of our engines.

 

So, what do you think, Random.. can the beta head be opened up around the valve stem to allow more air without ruining either the velocity or the waterjackets around it?

 

sweet jesus, what the hell happen there bro, u must have been super close clearances.... i have never seen it that bad before. dammmmmmm

 

interesting results man.

How much do heads usually get ported? What kind of numbers can we get out of our engines?

 

Credit goes to DMDicks.
He actually had a head flowbench tested, then modified

http://www.newtiburon.com/forums/showthread.php?t=30044

The gains were noticable, but not huge

Inake gain
0.050 21.21%
0.100 13.30%
0.150 9.75%
0.200 7.46%
0.250 8.02%
0.300 8.71%
0.350 13.50%
0.400 15.15%

Exhaust Gain
0.050 17.97%
0.100 5.12%
0.150 4.88%
0.200 6.90%
0.250 8.28%
0.300 10.86%
0.350 13.87%
0.400 16.29%

Keep in mind some of the gains he got at the dyno at the bottom are due to the new ECU he installed and tuned, but hey, 279hp and 276 torque with the alpine kit on stock internals is an accomplishment.

Let's NOT turn this into a dicussion of turbo/ecu stuff. Start another thread if you want that.

Regarding the port/polish.
The max gain he saw was 21.21% at 0.050 of valve lift. The average intake gain was 12.14% and the average exhaust gain was 10.52%. So since his last dyno was 240WHP and 275WTQ I would have expected to see a gain of between 29 and 24 HP He actually gained 39 WHP, so some of that is due to the ECU.


Regarding the porting on our heads. The intake ports are actually fairly good. They could use some smoothing and MINOR re-shaping, but nothing major. The exhaust ports do need more help. You can't do anything about the valve/valve guide boss, but you can try to increase the port area in that section to give the air somewhere to go "around" them. You can also cut them down a tad (radius them really) and polish them as much as possible to smooth airflow disturbances. In theory, I would expect flow gains in the 20 to 35% range as possible by a knowledgable head porting shop. DMDICKS is using a beta 2 head, which has a slightly better intake and exhaust port design. I would expect a stock beta 2 head to outflow a beta1 head by about 5%.

In theory to make great N/A power out of the beta motor you're going to have to get the intake/exhaust flows up to about/above 250 intake and 235 exhaust. That's NOT going to be easy unless you've got access to a flow bench and can do test after test after test, or can find someone who really knows what their doing and how ports flow. Any ape with a dremel can go in there and remove materal and enlarge the ports. However, that's not going to necessarily going to increase flow, or at least not much. Removing the right material in the right areas in the RIGHT WAY is the key. There are many books out there on head porting/polishing. If you're seriously considering it, I suggest you get your hands on as many of them as you can and read them. (try your larger libararies before you shell out your $$$ as many of them are quite expensive). Or try to find the best porting guy you can, and hope he's willing to work with you for a reasonable fee.

 

Thanks man. So, a 15-20whp gain should be expencted from porting/polishing head. If it can be done for under $1000, I think it would be the best N/A mod for our cars.

 

if increasing the flow on a stock motor could be 20 hp.. would that mean that when you install other mods such as a CAI that the CAI itself would see better gains as well because of more flow? i dont know if that makes sense...

 

exactly... while the mods do not add ontop of each other like regular addtion.. any modification that adds HP is going to benefit from a free flowing head.


I got to talk to my friend in the UK and see if he wants to try his hand at a Hyundai head.