OST's E and R&D

[oldeskewltoy]

Been doing a bit of experimenting (while waiting for the burette to arrive to replace the broken one from OST-026)
















Later today I'll be removing the pours of OST-026's 1st 2 exhaust ports. Once that is done, I'll fit the valves into OST-026 and pour the chamber. While I do that I'll be pouring the exhaust port from the untouched head....



So... I guess.... more to come....

Later today I'll be removing the pours of OST-026's 1st 2 exhaust ports. Once that is done, I'll fit the valves into OST-026 and pour the chamber. While I do that I'll be pouring the exhaust port from the untouched head....



So... I guess.... more to come....

First the clay is removed, and the valves come out....





Next I use a cork screw....




gradually working it free....





and viola......






The chamber of OST-026 was also poured...





and so was the exhaust port of the untouched head




more to come......

[Rogue-AE95]

Interesting... will you make molds/castings of each head you do work on starting with this one?

[MisterJerk]

That is one heck of a bend.

could you show a side by side of stock vs ported?
Any way we could see a atlantic ported head, chamber and ports.

[oldeskewltoy]

Interesting... will you make molds/castings of each head you do work on starting with this one?

The supplies, and the time involved don't make it economically feasible to just add it ... BUT I am thinking of offering this as an additional service, for a fee

Good work, I think Jeff did something similar quiet some time back.

Sent from my Nexus 4 using Tapatalk

Jeff was doing the 20V intake ports... I'm not sure, but I don't know if he ever did any exhaust bowls/ports

Nice way to compare your job with the original! :thumbs:

Thanks...

speaking about comparing the two....





The first thing I can tell you... the original exhaust is, without a doubt, a VERY good port. When I say I gain 3-10hp with my work... This port would lend itself to the lower side of my claim.

WHY?

The shape of the original port (bowls) shows a decent casting at both the short, and long radius's. They flow smoothly with little disruption. When I came across a head with nasty bowls, I'll cast it and post it, but for now you'll have to trust me... this original is pretty good.


So where do I gain 3, to lets say 5 hp in this head?

Part of it is in matching the valve seat to the bowl.... but the original design has a slight flaw........ It's "Y" shaped.... so the majority of where I improve the exhaust bowls and ports... even in a good casting... is where the bowls blend into the port......





I turn the "Y"... into a "V"... Less energy to navigate a straight port then one with a kink

Any way we could see a atlantic ported head, chamber and ports.

I can ask Loynings... but I have a feeling they don't like to reveal as much as I'm willing too....

[burdickjp]

Good work, I think Jeff did something similar quiet some time back.

Sent from my Nexus 4 using Tapatalk

I did intakes, but I intend on doing exhausts some time this summer, maybe even next week. There's a drastic difference between blacktop and silvertop exhaust ports. I can also cast a smallport exhaust to compare the three.

[yoshimitsuspeed]

Jeff did I tell you I got my hands on a ST head?

[burdickjp]

Jeff did I tell you I got my hands on a ST head?

Nope. They're funny, aren't they?

[yoshimitsuspeed]

Jeff did I tell you I got my hands on a ST head?

Nope. They're funny, aren't they?

I haven't had too much time to look at it. I can tell you that the ports and combustion chamber haven't been touched.

[oldeskewltoy]

Jeff did I tell you I got my hands on a ST head?

Nope. They're funny, aren't they?

Damn... I forgot to post.... I finally got the silvertop 20V back from Loynings... they ran it through their flowbench - intake side only....

@ 25"
.050 - 44.6
.100 - 92.4
.150 - 130.5
.200 - 154.2
.250 - 175.3
.300 - 188.1
.350 - 195.2
.400 - 197.6

[burdickjp]

Jeff did I tell you I got my hands on a ST head?

Nope. They're funny, aren't they?

Damn... I forgot to post.... I finally got the silvertop 20V back from Loynings... they ran it through their flowbench - intake side only....

@ 25"
.050 - 44.6
.100 - 92.4
.150 - 130.5
.200 - 154.2
.250 - 175.3
.300 - 188.1
.350 - 195.2
.400 - 197.6

Looks similar to numbers I had. I'm curious if you're not reporting exhaust side because you've got something else going on there?

What was their commentary on it?

[oldeskewltoy]

Damn... I forgot to post.... I finally got the silvertop 20V back from Loynings... they ran it through their flowbench - intake side only....

@ 25"
.050 - 44.6
.100 - 92.4
.150 - 130.5
.200 - 154.2
.250 - 175.3
.300 - 188.1
.350 - 195.2
.400 - 197.6

Looks similar to numbers I had. I'm curious if you're not reporting exhaust side because you've got something else going on there?

What was their commentary on it?

They flowed the intake side only....... once they found it wasn't substantially better they lost interest. You have to realize... they are getting enough air flow in and out of their heads that a 77 mm stroke 4AG is planting almost 280hp

I do plan on putting the 20V on my bench eventually... but based on preliminary observations I don't expect any dramatic increases over the 16V exhaust

[burdickjp]

They flowed the intake side only....... once they found it wasn't substantially better they lost interest. You have to realize... they are getting enough air flow in and out of their heads that a 77 mm stroke 4AG is planting almost 280hp

They've got a lot of development into the 16v engines. I would assume they would have no interest in going back and starting over their development on the 5 valve heads.

Almost 280HP out of a 4A with a 77mm stroke? That's enough to absolutely crush a few egos around here.

[oldeskewltoy]

Almost 280HP out of a 4A with a 77mm stroke? That's enough to absolutely crush a few egos around here.

Yeah... there is a certain other place that just got their engines disqualified (New Zealand) because they welded(added) material to the head... when the rules say you can't....

in fact the billet block Jondee found is against the rules to use.... in the type of competition I'm speaking about... and yes I'm being vague on purpose

[oldeskewltoy]

my flow bench has a new adapter.... 86mm






Welcome: Subaru/Toyota FA20/4-UGSE, Mazda/Ford F2T, Toyota 1J/2J, Nissan SR20, Nissan RB25/26, Toyota 3SG... and I'm sure many others...

I can now do flowbench testing on...

[oldeskewltoy]

wow... 2 years since an update.....


So lets see.... there has been some work on a few none Toyota heads...



SR20VE







VVT Miata (aka BP-Z3, OR BP-VE)










.... and as always... further development on the 4AGE....




I'll try to keep this a bit more current.......

[oldeskewltoy]

I did intakes, but I intend on doing exhausts some time this summer, maybe even next week. There's a drastic difference between blacktop and silvertop exhaust ports. I can also cast a smallport exhaust to compare the three.

no silvertop....