cylinder head mods: what did you do?

glntom

glntom

New Member
Apr 13, 2005
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Glenwood, AR
I am about to build another head for my motor, and don't want to overlook anything.
What have you done to your head, and was it worth it...
Obviously new valve springs, valve job, surfacing and "cleanup" of ports are to be done. What else?
Pictures of any port work could be very helpful.
 
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IJ.

Grumpy Old Man
Mar 30, 2005
38,728
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I come from a land down under
Full port job
+1mm Valves
Combustion chambers relieved for larger valves
Ferrea Springs
Ferrea Retainers
Ferrea Locks
Ferrea Spring seats
Viton Stem seals
Radius Seat job
Diamond cut deck

Head Work






 
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gixxer750

2jzget comingsoon!
Mar 30, 2005
2,333
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Mississippi
I polished up all my ports myself. I took a small amount of material out to get rid of all the casting marks, and then polished everything up with 400 grit sandpaper. It seems to help the car a bit off boost.
 
Suprapowaz!(2)

Suprapowaz!(2)

New Member
Apr 10, 2006
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San Antonio, Tx.
I bought the head already ported and polished. I haven't been able to actually see any results since I had low compression in #1 cylinders due to broken ringlands.

Here is the stock port on my spare head.
rscf29196rq.jpg


This is the new (rebuilt) head I bought.
rscf29426wm.jpg


I bought this port and polished head becuase the mechanic mis-diagnosed my low compression due to a burnt exhaust valve. He convinced me to buy this head that had been sitting in the machine shop for some years. I got it at a decent price back then. I just haven't been able to unleash its power. The exhaust side was ported as well, but pics of it looked dirty cause of the carbon build up.


rscf29546dj.jpg
 
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gixxer750

2jzget comingsoon!
Mar 30, 2005
2,333
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Mississippi
no, he is getting at the intake should be a little more rough I think. I didn't work quite as hard on the intake side as I did the exhaust ;)
 
bo3232000

bo3232000

Lurking in the dark
Jul 22, 2005
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Cumming,Georgia
www.cardomain.com
I cant remember if it is the intake or exhaust side but there are ridges that help the scavenging effect and if they are removed the effect that is caused is twice as much turbulance resulting in an increase of backpressure..like i said i cant remember where i read this but,if anyone has heard of this please post so i can refresh my memory and hopefully enlighten the group....If i am wrong then i say dumdass!!!!!!!!!!!!and will repeat it while looking in the mirror...
 
bo3232000

bo3232000

Lurking in the dark
Jul 22, 2005
57
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Cumming,Georgia
www.cardomain.com
If I am correct i beleive that the dams help with creating a suction out of the head and with out them the exhaust has a harder time exiting,thus creating more backpressure and more lag on spoolup....There job was to create a more balanced exodus of the gases before the turbo to even out the pulses and create more draw on the non turboes...Hopefully this will clarify the answers you have recieved so far.......
 
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Halsupramk3

Member
Apr 4, 2005
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Mississippi
I think reversion dams are important in a log manifold to keep the gasses going the correct direction.

I ported my head myself and you can get good results by just removing the lip under the valve seats. I also made sure the ports were slightly smaller at the airs exit than at the entrance to keep up velocity. The intake ports get smaller as the air flows towards the valves and the exhaust port gets smaller as the gasses flow out of the head. that is hard to do if you dont keep the reversion dam.

here is a link to what i did to my head. polish and port with swain tech coatings.

http://www.supraforums.com/forum/showthread.php?t=270783
 
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