TFS twisted wedge heads and all sorts of other stuff

[Mustang95GTS]

I am planning on buying a set of used TFS TW heads that have been worked over w/ $600 worth of machine work done to them. They still retain the stock CC for the combustion chamber. Can I use the stock injectors w/ the setup I have? I also put a TFS stage 1 cam in it the other day. It will be tuned w/ a PMS also. Thanks

 

[1105]

You CAN use stock injectors but boost that fuel pressure up to 50psi... You'll really want to go with at least 24's for a H/C/I setup. My car is running lean with the mods in my sig with stock MAF/Injectors at 50psi

 

[Joes95GT]

The car is going to be a dog until about 3000 RPM, and you'll be pulling it off the limiter every shift. I think it was Green 94 5.0 who used a set of ported TFS heads and didn't like them. They were too much head, and I believe he used the same cam as you want (Stage 1). Your either going to have to use a BIG cam or find an unported set of heads. Do you know the exact specs of the heads (flow numbers, port volumes, etc.)?

Joe

 

[swingline]

The car is going to be a dog until about 3000 RPM, and you'll be pulling it off the limiter every shift. I think it was Green 94 5.0 who used a set of ported TFS heads and didn't like them. They were too much head, and I believe he used the same cam as you want (Stage 1). Your either going to have to use a BIG cam or find an unported set of heads. Do you know the exact specs of the heads (flow numbers, port volumes, etc.)?

Joe

Why would he need a bigger cam if the heads were already flowing too much for the motor they were on? Sorry if the answer is obvious but I am new to this stuff.

 

[VibrantRedGT]

Actually I own Green's TW heads now. I may throw them on a stock block for the time being. I'll get my lower intake gasket matched to these and order up a FTI cam.

 

[Joes95GT]

Why would he need a bigger cam if the heads were already flowing too much for the motor they were on? Sorry if the answer is obvious but I am new to this stuff.

With a 1.90 valved AFR or E-Brock head, the velocity is going to be easy to attain because the port volumes are relatively small. On a ported TFS head with a 2.02 intake valve, valve timing needs to be much different.

An AFR or E-Brock headed car can have an IVO (intake valve opening) event at anywhere from 10* to 0* BTDC. An opened up TFS head will have an IVO of something like 8* ATDC. Why, do you ask? That's anywhere between 8-18* of difference?

On the intake stroke (when the air travels into the cylinder), only the intake valve is open. This (IVO) can sometimes start late into the exhaust stroke, but it happens primarily during the intake stroke, and that's what I'll concentrate on. On the intake stroke, the piston is traveling down in the bore, allowing air to come in. Because the ports are so large, air gets lazy in those ports and isn't rushing into the heads. This is fixed by having a late IVO. Imagine the piston going from TDC and traveling 8* down the bore and the intake valve is not open. What happens? It creates a suction-type force, that actually pulls the air down into the cylinder once the intake valve is cracked (IVO). Instead of velocity happening naturally like in the AFR and Edelbrock heads, it has to be forced with camshaft timing. This creates a huge vacuum-like affect and speeds up airflow all throughout the intake tract, making up for the velocity that isn't occuring "naturally."

Sorry if I confused anyone. I'm not a good describer. Tell me if you don't get it and I'll try again.

Joe - You've got a PM coming...

Joe

 

[swingline]

Thanks man. I just need everything laid out in black and white or I get lost easily.

 

[nito88stang]

Do TW Heads come with guideplates or do you have to buy them seperately?