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....

oldeskewltoy Wrote: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......

[banpei]

Nice way to compare your job with the original!

[Bean]

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

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[oldeskewltoy]

from another forum Wrote: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

(05-11-2014 10:24 PM)Bean Bandit Wrote:  Good work, I think Jeff did something similar quiet some time back.

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

(05-11-2014 08:15 PM)banpei Wrote:  Nice way to compare your job with the original!

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

from another forum Wrote: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....

[banpei]

Exactly what I was aiming at...
Nice job on the porting!