6G Celicas Forums

Here a guy that did it cheap

http://www.celicatech.com/forums/showthread.php?t=17078

Probably not. You would loose more low end than you make up on the top end. I would not do this unless you are running some cams with more than stock duration.

If you do add some cams , here is a way to mod your intake for better high end pull. This shortens the intake track and adds a bit of volume to the plenum as well.

Nice! I am with you; there is a lot of potential in the FE head that has not been extracted. It had to be a rush feeling that 4AFE coming on at the old red line!

I’m following your progress with interest. I am researching the 7AFE in NA form because I am planning on building one too. I have not found much about how these engines respond to bigger cams. I just finished measuring the specs on a set of stock cams from a 1994 Corolla 7AFE and was shocked to see how short the duration is.

Intake 147 degrees @ .050
Exhaust 151 degrees @ .050
Overlap at TDC is less that .020

I have built up lots of different engines over the years and have never seen a cam with such short duration. For this engine to make the power it does with this small of a cam says a lot for the tuning Toyota did. It also says a lot for the combustion chamber and ports. The combustion chamber benefits from being so small and shallow. The fast burn produces lots of torque. You can get high compression with dished pistons and still run on pump gas. If you are doing a rebuild, the Toyota 4AGZE piston can be used to get a good bump in compression. The port design is excellent, and looks very much like the port that was used on the Formula 1 engines. Small, but very straight allowing for high port velocity = wide power band.

I have recently spoken to several cam grinders. I have not found anyone that can get new cores for the cams. This is probably why not many people have been camming the 7A. I found a few cam grinders that will regrind your stock cams for $200 to 250 a pair. These are not welded, so you need to use lash caps under the cam buckets. You can also get welded regrinds for $300 – 600 a pair. You have to be careful with welded regrinds as the process is much harder (easier to screw up). A poorly done weld and cool down process leaves you with a cam that is bent or tends to bend after running.

It is likely that you do not need a big change in duration to feel a difference. The down side of changing the cam is that tuning the engine will likely get way harder. When you change the cam timing, you will need to start the tuning process all over to get the spark timing and a/f correct.

Good luck with your build up and hope you get 130+

Nice write up on the 7AFE.

I am curious about the cam you put in as it has a lot more duration than a stock cam. Did you loose much low end? What rpm does it start pulling hard and how high does it pull now? My stocker (except for a header) is all done at about 6000.