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#2592677 - 12/16/18 07:22 AM Eagle Head
ric3xrt Offline
pro stock

Registered: 01/13/06
Posts: 1281
Loc: Trumbauersville PA
My supplier dropped of some Eagle heads the other day, and I know most of us have seen these heads cut open, but here's some of the dissected parts I wanted to see.
1st boring head shot, 2 is what the oil passages look like(kind of), 3rd is a cross-section where the spark plugs mount...notice the water pocket. 4th is also of the water jacket between cylinders.


Attachments
Eagle Head 1.jpg

Eagle Head Aa.jpg

Eagle Ab.jpg

Eagle Head Ak.jpg


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#2592678 - 12/16/18 07:24 AM Re: Eagle Head [Re: ric3xrt]
ric3xrt Offline
pro stock

Registered: 01/13/06
Posts: 1281
Loc: Trumbauersville PA
Been asked a few time is I know what the thickness is between the push rod hole and port wall ...so here's some photo's here's the Intake port cut horizontal , 1st shot is an ordination shot, 2nd is close up, 3rd the section is turned 180 degree, 4th is top and bottom side by side


Attachments
Eagle Head Ac.jpg

Eagle head Ad.jpg

Eagle Head Ae.jpg

Eagle Head Af.jpg


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#2592679 - 12/16/18 07:26 AM Re: Eagle Head [Re: ric3xrt]
ric3xrt Offline
pro stock

Registered: 01/13/06
Posts: 1281
Loc: Trumbauersville PA
Closer shots, 3rd is not the greatest, I'll take some better ones later on in the week.
The thickness between the part wall and the pushrod hole is roughly .150.


Attachments
Eagle Head Ag.jpg

Eagle Head Ah.jpg

Eagle Head Ai.jpg

Eagle Head Aj.jpg


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#2592680 - 12/16/18 07:28 AM Re: Eagle Head [Re: ric3xrt]
ric3xrt Offline
pro stock

Registered: 01/13/06
Posts: 1281
Loc: Trumbauersville PA
Intake Cross-section 1st two are the same port just different side of the cut, one has valve seat in it the other doesn't, last 2 are it's relation to the Exhaust port.


Attachments
Eagle Head Al.jpg

Eagle Head Ala.jpg

Eagle Head Am.jpg

Eagle Head An.jpg


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#2592681 - 12/16/18 07:33 AM Re: Eagle Head [Re: ric3xrt]
ric3xrt Offline
pro stock

Registered: 01/13/06
Posts: 1281
Loc: Trumbauersville PA
I have BGE's ,Hellcat, Apaches and Pre Eagle s here that have been cut up in the same manner I'll try and get those posted in the next few weeks.
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#2592725 - 12/16/18 10:16 AM Re: Eagle Head [Re: ric3xrt]
fbs63 Offline
pro stock

Registered: 11/17/03
Posts: 1318
Loc: NW Indiana
Great info. Thanks! Ever tubed the pushrod hole ala Gen II heads? If so any flow improvement?

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#2592806 - 12/16/18 12:33 PM Re: Eagle Head [Re: ric3xrt]
HotRodDave Offline
master

Registered: 01/29/05
Posts: 9940
Loc: Kalispell Mt.
looks like the PR pinch could almost be ground away and still have enough meat there, is that true? Same with the spring seat bump maybe? Also looks like radiusing the intake short turn at the peak maybe 1/2 inch up might help flow make the turn better, any testing to confirm or deny that?
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#2593084 - 12/17/18 08:24 AM Re: Eagle Head [Re: ric3xrt]
onig Offline
enthusiast

Registered: 07/09/08
Posts: 352
Loc: Canada
Thanks for the info.
Would love to see the Aphaces and BGE's.
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#2598255 - 12/29/18 03:26 AM Re: Eagle Head [Re: ric3xrt]
sixpackgut Offline
Drag Week Mod Champion

Registered: 06/08/03
Posts: 9120
Loc: Charleston
Its very easy to go to far a pop a hole in the pushrod hole.


Attachments
20181212_201651_Burst01.jpg




Edited by sixpackgut (12/29/18 03:28 AM)
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#2598317 - 12/29/18 09:05 AM Re: Eagle Head [Re: HotRodDave]
ric3xrt Offline
pro stock

Registered: 01/13/06
Posts: 1281
Loc: Trumbauersville PA
Originally Posted By HotRodDave
looks like the PR pinch could almost be ground away and still have enough meat there, is that true? Same with the spring seat bump maybe?


the push rod bump is about .150 thick, the same with the valve spring bump , I don't have the measurement right here , right now, but if I remember it was in the .125-150 range.
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#2598319 - 12/29/18 09:09 AM Re: Eagle Head [Re: fbs63]
ric3xrt Offline
pro stock

Registered: 01/13/06
Posts: 1281
Loc: Trumbauersville PA
Originally Posted By fbs63
Great info. Thanks! Ever tubed the pushrod hole ala Gen II heads? If so any flow improvement?


On the 6.1 yes these no,
I've been polishing the humps to a mirror finish and leaving the rest of the port at a 60 Grit finish.
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#2598324 - 12/29/18 09:22 AM Re: Eagle Head [Re: HotRodDave]
ric3xrt Offline
pro stock

Registered: 01/13/06
Posts: 1281
Loc: Trumbauersville PA
Originally Posted By HotRodDave
Also looks like radiusing the intake short turn at the peak maybe 1/2 inch up might help flow make the turn better, any testing to confirm or deny that?



I was thinking about filling in the top of the port from the entrance to the valve spring bump and lower the floor the same amount to the short side radius.
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#2598348 - 12/29/18 10:20 AM Re: Eagle Head [Re: ric3xrt]
sixpackgut Offline
Drag Week Mod Champion

Registered: 06/08/03
Posts: 9120
Loc: Charleston
Originally Posted By ric3xrt
Originally Posted By HotRodDave
Also looks like radiusing the intake short turn at the peak maybe 1/2 inch up might help flow make the turn better, any testing to confirm or deny that?



I was thinking about filling in the top of the port from the entrance to the valve spring bump and lower the floor the same amount to the short side radius.


If you look at the cutaway you can almost see how the floor is cast to high as it gets to the intake flange. Im going to stop wasting my time on porting alot of the port on these heads because it all just comes down to the floor and making the valve seat fit the valve. All the other stuff doesnt matter.

The DP heads that were on the factory stock Barton car, the cnc only touches the floor.
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#2598350 - 12/29/18 10:22 AM Re: Eagle Head [Re: ric3xrt]
fbs63 Offline
pro stock

Registered: 11/17/03
Posts: 1318
Loc: NW Indiana
Sixpackgut, what's the vein for on the floor of the port? Pick up high or low lift #s?

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#2598369 - 12/29/18 11:06 AM Re: Eagle Head [Re: ric3xrt]
sixpackgut Offline
Drag Week Mod Champion

Registered: 06/08/03
Posts: 9120
Loc: Charleston
If your flowing an eagle or apache head and you lay a pen or even your fingure on the floor, flow picks up.

Same thing even happened when I flowed hhp/bes $2k cnc job.

It also helps knowing how deep your grinding. It immediately bangs the .400 number over 300 cfm


Edited by sixpackgut (12/29/18 11:19 AM)
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#2599146 - 12/31/18 09:28 AM Re: Eagle Head [Re: sixpackgut]
ric3xrt Offline
pro stock

Registered: 01/13/06
Posts: 1281
Loc: Trumbauersville PA
Originally Posted By sixpackgut
If your flowing an eagle or apache head and you lay a pen or even your fingure on the floor, flow picks up.

Same thing even happened when I flowed hhp/bes $2k cnc job.

It also helps knowing how deep your grinding. It immediately bangs the .400 number over 300 cfm



The Vein , is there a certain Width that works best?
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Truth has no agenda, but those with an agenda make their own truth.
Some of us are so open minded they only see their View




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#2599672 - 01/01/19 03:29 AM Re: Eagle Head [Re: ric3xrt]
sixpackgut Offline
Drag Week Mod Champion

Registered: 06/08/03
Posts: 9120
Loc: Charleston
I have not spent time comparing a sharp vein to one that is wider like in the photo but it seems to get the same results.

There is another thing on the eagles that helps. Machine cut on chamber on intake valve side. None of the Apache heads Ive seen has it


Attachments
Screenshot_2019-01-01-03-30-50-1.png




Edited by sixpackgut (01/01/19 03:33 AM)
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#2599673 - 01/01/19 03:38 AM Re: Eagle Head [Re: sixpackgut]
sixpackgut Offline
Drag Week Mod Champion

Registered: 06/08/03
Posts: 9120
Loc: Charleston
And it becomes very obvious why just a valve job will pick up flow 10 cfm +.

I bet a very light bowl blend, a vj and that spot in the chamber is 25 cfm. I get around 353 @.600 out of eagles.


Attachments
Screenshot_2019-01-01-03-31-00-1.png




Edited by sixpackgut (01/01/19 03:39 AM)
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#2600117 - 01/01/19 06:12 PM Re: Eagle Head [Re: ric3xrt]
340Cuda Offline
top fuel

Registered: 04/04/03
Posts: 2219
Loc: Tulsa, Oklahoma
Ray do you see any gains with valves at are polished on the back?

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#2600234 - 01/01/19 08:36 PM Re: Eagle Head [Re: 340Cuda]
sixpackgut Offline
Drag Week Mod Champion

Registered: 06/08/03
Posts: 9120
Loc: Charleston
Originally Posted By 340Cuda
Ray do you see any gains with valves at are polished on the back?


I wouldn't think that would be that critical. But a lighter and larger valve would be helpful
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