OST-044: What the "F"?

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oldeskewltoy
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OST-044: What the "F"?

Postby oldeskewltoy » Thu Jun 08, 2017 4:35 pm

It has been a while since I did an "F" head, Grunt's lump was built Dec 2010 to June 2011 - F head port, and rebuild

This "F" head is a later type, with the raised intake ports.

Time to get it cleaned and pressure checked

Image

Image


current short radius.....

Image



more to come...... :D
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

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Rogue-AE95
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Re: OST-044: What the "F"?

Postby Rogue-AE95 » Sat Jun 10, 2017 5:25 am

I was hoping to see you attack one of the 2nd gen 4A-FE heads someday. I have one sitting atop the 7A-FE I bought to make a 7A-G(T)E, and wondered if it would be better or worse than the 1st gen head for building up a turbo'd economy engine.

Those 2nd gen intake ports are so steep.
'88 Corolla All-Trac

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oldeskewltoy
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Re: OST-044: What the "F"?

Postby oldeskewltoy » Mon Jun 19, 2017 7:12 am

Rogue-AE95 wrote:I was hoping to see you attack one of the 2nd gen 4A-FE heads someday. I have one sitting atop the 7A-FE I bought to make a 7A-G(T)E, and wondered if it would be better or worse than the 1st gen head for building up a turbo'd economy engine.

Those 2nd gen intake ports are so steep.



haven't even touched it yet.... and YES it would make for a much better head for ANY "F" application - turbo, n/a, or S/C
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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oldeskewltoy
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Re: OST-044: What the "F"?

Postby oldeskewltoy » Tue Jun 20, 2017 2:17 pm

Rogue-AE95 wrote:
Those 2nd gen intake ports are so steep.


That they are.....

Image


The intake valves are also bigger, 1st gen 30mm, 2nd gen 31mm ;)



That is the extent of the good news... the bad news.... the front oil drain still interferes with the exhaust flow on #1 exhaust port :(

Image


Image






more to come....... :mrgreen:
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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Rogue-AE95
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Re: OST-044: What the "F"?

Postby Rogue-AE95 » Tue Jun 20, 2017 6:36 pm

Figures about the oil passage. Why make something perfect, right? ;)

I guess the intake couldn't be any better of an angle, going more like ( instead of L.
'88 Corolla All-Trac

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oldeskewltoy
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Re: OST-044: What the "F"?

Postby oldeskewltoy » Thu Jun 22, 2017 7:10 pm

Do you see what I see..... ???

Image


more to come..... :D
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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Rogue-AE95
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Re: OST-044: What the "F"?

Postby Rogue-AE95 » Fri Jun 23, 2017 3:53 am

Cleaned up casting, like you do with the G heads? Or was it that nice from the foundry?
'88 Corolla All-Trac

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oldeskewltoy
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Re: OST-044: What the "F"?

Postby oldeskewltoy » Fri Jun 23, 2017 12:28 pm

Rogue-AE95 wrote:Cleaned up casting, like you do with the G heads? Or was it that nice from the foundry?

I've deburred, and cleaned the casting some... but there is another something that I see..........



While you are still trying to see what I see.... :?:



7 years ago when I built "Grunt's Lump, OST-011", I didn't have the easiest(best?) tool for setting, AND measuring the valves.......

Image



Here is the design, and building process for the tool I'll be using this time.....

Image


quite a bit more accurate and reliable!




more to come....... :D
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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