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Old 08-15-2005, 03:30 AM   #1 (permalink)
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High flow head

what should i get done to improve the flow in my 4af head. and the best way for it to be done.
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Old 08-15-2005, 06:50 AM   #2 (permalink)
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Porting with a flowbench and shaping the intake and exhaust ports and runners. Then some cams with higher lift and duration.
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Old 08-15-2005, 06:32 PM   #3 (permalink)
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I agree with him pnp your head. And match the intake and exhuast ports. Get a valve job and a bigger cam. Also bore your tb.
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Old 08-15-2005, 11:28 PM   #4 (permalink)
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Boring the TB isnt the first thing I'd be doing, Too big TB causes low RPM stumble, becuse air metering is more crude.
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Old 08-16-2005, 04:01 AM   #5 (permalink)
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what do you mean by a valve job?
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Old 08-16-2005, 06:05 AM   #6 (permalink)
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grinding more angles to it and shaping the valvedisc and putting in stainless steel, etc oversized valves.
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Old 08-18-2005, 12:03 AM   #7 (permalink)
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how much gains would i expect to see with a standrd carb?
from a pnp and a valve job?
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Old 08-18-2005, 01:12 PM   #8 (permalink)
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If properly done, you might see some, a better carb would help.
You could get closer to 200hp with 11-11.5:1 CR pistons, Porting, intake port shaping, oversized valves, camshafts and a custom manifold with Throttlebodies or twin sides, crankshaft knifeing and balancing, light weight flywheel would help in revving.

Like my friend said "Why would I possibly want to get a GZE when I can get the same power from my FE"
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Old 08-18-2005, 02:08 PM   #9 (permalink)
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For the price of a professional port job you could almost get a 4AGE, which will flow better stock that a modded 4AFE can hope for. Noit the head, but the whole engine.
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Old 08-18-2005, 02:56 PM   #10 (permalink)
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It wont flow better STOCK then the modded FE, FE heads have much more possibilities for head porting/shaping than a GE head, thats a fact. Yes it might be cheaper, wheres the challenge there when everyone and their dog has a GE.... I can do most of the machining at school, we have access now to CNC mills, lathes, and a whole lot of other machining tools... I'm gonna start a 4A-F engine project thats gonna be a long term project, so dont ask me about it... I can tell you it might be something worth waiting for.
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Old 08-18-2005, 03:59 PM   #11 (permalink)
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Quote:
Originally Posted by Flashmn
If properly done, you might see some, a better carb would help.
You could get closer to 200hp with 11-11.5:1 CR pistons, Porting, intake port shaping, oversized valves, camshafts and a custom manifold with Throttlebodies or twin sides, crankshaft knifeing and balancing, light weight flywheel would help in revving.

Like my friend said "Why would I possibly want to get a GZE when I can get the same power from my FE"
That sounds funny to me considering even TRD's 4AGE's and FA motors only make between 200-240 hp with 300+ degree cams and 12+ compression at an unreachable 10,000 rpms (not streetable unless you like launch the car at 6000 rpms after every stop sign)...
Quote:
It wont flow better STOCK then the modded FE, FE heads have much more possibilities for head porting/shaping than a GE head, thats a fact. Yes it might be cheaper, wheres the challenge there when everyone and their dog has a GE.... I can do most of the machining at school, we have access now to CNC mills, lathes, and a whole lot of other machining tools... I'm gonna start a 4A-F engine project thats gonna be a long term project, so dont ask me about it... I can tell you it might be something worth waiting for.
I say if the FE head was as good as you claim... why is it that Toyota's engineering teams design and utilize the GE head for racing purposes? Are you saying you know better than Toyota? Maybe you're the ONLY clever person in the entire world smart enough to know the FE head's true potential... and EVERYONE else tuning GE heads are out of their goddamn minds.

The FE head is a good design for charge velocity and response... but it's not a performance head. Take that for what you will... but there's a reason why race teams don't use 4AF's and 5SFE's for racing. It's also the reason every single major manufacture uses true wide angle DOHC for their performance n/a horsepower engines. Honda, BMW, Ferrari, Toyota, Nissan, on and on... whatever makes you feel better about you econobox though...
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Old 08-18-2005, 04:39 PM   #12 (permalink)
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That sounds funny to me considering even TRD's 4AGE's and FA motors only make between 200-240 hp
closer to 200 can mean 170hp.. never said EXACTLY 200 or OVER 200.

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I say if the FE head was as good as you claim... why is it that Toyota's engineering teams design and utilize the GE head for racing purposes? Are you saying you know better than Toyota?
Flow isnt the whole equation, its just a part of it. FE head has its limitations. Now, most categorized racing series you have to use a manufactured engine, you cant use an engine that you basically turn into something else. There the FE would be at a disadvantage to the GE, hence they'd use the GE. Formula Atlantic series, ALL The engines are basically the same, you cant make radical modifications.
The difference is that if you plan to make somethine else, well.. the FE has more material to shave off, you can bend and shape the ports alot better.

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Maybe you're the ONLY clever person in the entire world smart enough to know the FE head's true potential
Thank you, I'll take that as a complement

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whatever makes you feel better about you econobox though...
Hardly an econobox, when it does ~10mpg
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