OST-056: Nasty.....

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oldeskewltoy
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OST-056: Nasty.....

Postby oldeskewltoy » Wed May 01, 2019 9:56 am

Image


Another first gen 4AG head, this one is a bit Nasty....

Image


Btw, here is a photo showing the difference between a 1st gen TVIS head, and a 2nd gen TVIS head. A first gen is what came on the AE86, the 2nd gen is later

Image



So, getting back to OST-056, the head is stripped, cleaned(?), and pressure checked. Once back, I deburr the casting

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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Sprite
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Re: OST-056: Nasty.....

Postby Sprite » Wed May 01, 2019 4:35 pm

Thanks, Nice to see the comparison, looking forward to seeing the build.
Rick

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Rogue-AE95
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Re: OST-056: Nasty.....

Postby Rogue-AE95 » Wed May 01, 2019 5:50 pm

oldeskewltoy wrote:Btw, here is a photo showing the difference between a 1st gen TVIS head, and a 2nd gen TVIS head. A first gen is what came on the AE86, the 2nd gen is later

Image


I have to wonder if Toyota had the MR / FWD mounting in mind when they (or Yamaha) designed the 4A-GE. I have one each of the big port heads and noticed this difference.
'88 Corolla All-Trac

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oldeskewltoy
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Re: OST-056: Nasty.....

Postby oldeskewltoy » Mon May 06, 2019 10:05 am

Rogue-AE95 wrote:
oldeskewltoy wrote:Btw, here is a photo showing the difference between a 1st gen TVIS head, and a 2nd gen TVIS head. A first gen is what came on the AE86, the 2nd gen is later

Image


I have to wonder if Toyota had the MR / FWD mounting in mind when they (or Yamaha) designed the 4A-GE. I have one each of the big port heads and noticed this difference.


I've yet to see a Toyota application that uses that mount...........






Work on the head proceeds.....



"Building" the intake side - blending the seat, bowl, and port ;)

Image



also working the exhaust side

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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Re: OST-056: Nasty.....

Postby Rogue-AE95 » Mon May 06, 2019 5:25 pm

oldeskewltoy wrote:I've yet to see a Toyota application that uses that mount...........


There's a small bracket that bolts to that part of the head. At least for the AE92 GTS. There's a hole in the top timing belt cover for it to stick out of. Then there's a plate which mounts from that bracket to the top of the alternator bracket. I have a pic somewhere of the pieces, I'll have to post it. There may be more to it but I forget. I pulled everything from a junkyard AE92 GTS.

Edit: here's a pic. The bracket is on the far right. I think the middle plate/bracket also bolts to the engine mount. There's 2 holes at that end, one of which bolts to the small bracket situated between the cam gears.

Image
'88 Corolla All-Trac

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oldeskewltoy
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Re: OST-056: Nasty.....

Postby oldeskewltoy » Tue May 07, 2019 12:22 pm

Rogue-AE95 wrote:
oldeskewltoy wrote:I've yet to see a Toyota application that uses that mount...........


There's a hole in the top timing belt cover for it to stick out of.


Can you show me this /\ timing cover... all I've ever seen is the typical fwd cover \/...

Image
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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Re: OST-056: Nasty.....

Postby Rogue-AE95 » Wed May 08, 2019 6:27 pm

I'm sorry I derailed the topic with this, but I guess we all learn something new every day. And I always love to see your work!

OK, here are some better pics. I had pulled all of the timing covers for my (someday, someday, someday) engine build, along with that small "cam bracket."

Image

Image

Image

^ Bracket looks smooth in parts because I've been taking off the casting lines & imperfections, so that I can get it powder coated along with other parts.
'88 Corolla All-Trac

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oldeskewltoy
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Re: OST-056: Nasty.....

Postby oldeskewltoy » Wed May 08, 2019 6:59 pm

new to me..... 8-)
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-056: Nasty.....

Postby oldeskewltoy » Fri May 10, 2019 12:03 pm

After learning about the timing cover from Rogue-AE95....

good lesson(for everyone)... even if you think you know it all....... you don't




Now, back to OST-056....



oldeskewltoy wrote:
Image




A facebook "viewer" asked if my work fits the stock gasket... I assured him it does......

Image


Further progress... 3 down... 1 to go

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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oldeskewltoy
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Re: OST-056: Nasty.....

Postby oldeskewltoy » Thu May 16, 2019 3:13 pm

back from the machine shop wearing a new 3 angle, and back cut intake valves....

Image



next, checking chamber volumes...

Image





So if I want chambers down to 36cc, how much should I have machined from the head???



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!

User avatar
oldeskewltoy
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Re: OST-056: Nasty.....

Postby oldeskewltoy » Fri May 17, 2019 8:54 am

from another forum wrote:It's very late so my math might be off but I think about 1.5 thou (inches) sounds wrong but that's all I can come up with right now. I'm rusty with my numbers and a bit tipsy.



well, about .008" is about 1cc(+ or -), so @ .6cc over, that would be about .005"

Image


and that's how much I had it machined.....


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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oldeskewltoy
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Re: OST-056: Nasty.....

Postby oldeskewltoy » Mon May 20, 2019 12:03 pm

The head is now ready for re-assembly....

Image
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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