A new Panchito 044 challenger ?

[vince1]

Just came on AA Website and found those new AA502 heads, if anyone have some infos about those ?

https://aapistons.com/products/502-series-performa...6kWzk1NPBw

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[Dan Ruddock]

Boy it would be nice to know what the port volume and flow numbers are. Someone is going to have to test for this.

[Brian_e]

I am ordering a set of 40x35, and I have some more as cast, and CNC panchito's on the way.

I will give them all a good measuring and then run them on the flow bench.

I am eager to see the port volume, and the average airspeed of these new ones.

Panchitos are tough to beat in the right application, but they could use some competition. Maybe I could talk Roy into sending me one of his 050 to test at the same time.

Brian
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[Glenn]

[Dan Ruddock]

Looks like a modified 501 casting. Bet the Panchito will be better, looks like they slapped on a bigger port. The undrilled 502 will also run hotter, the Panchito has better cooling air flow threw but this 502 head has more potential with more port meat for an even bigger port than is possible with the Panchito.

[Brian_e]

Ya, It will be interesting to see what the rest of the port looks like. The shape at the flange doesn't really mean a whole lot compared to the rest of the port. I am betting typical AA valve job. Hopefully AA did some research and got some knowledgeable help when doing these. Huge improvements could be made with a clean slate AA500 head.

Or.....like the AA thickwall long 94's, they added material in one spot, and completely missed the boat in the important spots.

Let's hope they got closer.

Brian
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[modok]

The autolinea panchito has massively Beefed up combustion chamber and skinny port walls.

This chinese head is the opposite.
Thickwall ports and thinwall chamber

[Brian_e]

[vwracerdave]

My concern isn't how well they flow or the HP they produce. My concern is how long they last. I'm sure lots of engine builders could port them and match the flow of the Panchito's. My question is how long before the seats drop out or the springs and valve guides need replaced. How do they hold up on a street engine after a 3 hr road trip. It may take 5 years of road testing before we know these questions. Just because a new product looks cool that doesn't mean it will out preform the competition.
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[jpaull]

[evanfrucht]

My question is... the 500 and 501 have been around for a long enough time that we know the main issues with them, such as mediocre valve job and guides, plus they can really benifit from having extra cooling thru holes drilled in certain areas...

So, is this 502 simply a 501 with a different shape port cast in? Did they do ANYTHING else different with the casting or machining procedures/equipment?

If NOT that will answer a lot of questions.
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[Glenn]

[Brian_e]

[GMendoza]

Those heads are a collaboration with AA and Brother's. A mold was taken from Brother's hand ported heads and these were the result.

If you are concerned about quality of the valve job, buy them from Brother's instead although they are a few bucks more since they do their own valve job.

I just built a 2180cc with these heads; very impressed.

[modok]

I'm glad to hear good news about it. The more good heads we have the better.

Excessive material can always be removed easier than adding missing material! So they are going the right direction I think.

But it is the.... third? different head with the same 502 casting number....
or is it literally the same mold and they keep altering it. ?
They don't understand the function of a casting number.

[evanfrucht]

The 500 and 501 are similar but the 501 actually is a different casting on the exterior. They added material around the ports on the 501 since the 500 only allowed so much port volume without welding. This 502 looks like they didn't change anything except for the inside of the ports, compared to the 501. I guess to be fair they are all cast a little different, so therefore do perhaps deserve their own casting numbers.

Honestly I like the AA casting quality. My main gripe Is the fact that the valve guides are not great and that the valve job could be a little bit more precise out of the box...
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[jeffrey8164]

Where are AA’s coming from?
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[RandyV]

[modok]

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