Improved Akron-Hed sanity check

Discuss all things Model T related.
Forum rules
If you need help logging in, or have question about how something works, use the Support forum located here Support Forum
Complete set of Forum Rules Forum Rules

Topic author
Kevin Pharis
Posts: 317
Joined: Thu Jan 10, 2019 3:54 pm
First Name: Kevin
Last Name: Pharis
Location: Sacramento CA

Improved Akron-Hed sanity check

Post by Kevin Pharis » Thu Mar 12, 2020 9:03 pm

This is not the first sanity check for this project... and it won’t be the last. So far every sanity check has proven that sanity has little to do with this project! 😉

The original design;
3179BB4E-AC37-4DD0-94F7-E871504D667A.jpeg
The concept;
BDAD37A6-7008-4B33-AB35-1083E3F20882.jpeg
Up close with the rockers;
FCB231F6-3188-4C58-94D9-D306EA1781E0.jpeg
Just a bit of welding left to do on the cover;
88A357EC-8CA7-4F0F-8E9F-D26C46FAC17E.jpeg
50B11C0A-C198-481C-B52D-9C0532DD7263.jpeg
After all the welding is done, there is just a few details to button up and it’s time to start thinking bout swapping out the ‘ol Sherman flathead 😁


pete eastwood
Posts: 39
Joined: Sun Jan 13, 2019 6:17 pm
First Name: Pete
Last Name: Eastwood
Location: Southern Califiornia

Re: Improved Akron-Hed sanity check

Post by pete eastwood » Thu Mar 12, 2020 9:11 pm

I like what I see .
Interesting valve layout, side to side , rather than front to back like all the other overheads ! .
It will be interesting to see how it performs .


Topic author
Kevin Pharis
Posts: 317
Joined: Thu Jan 10, 2019 3:54 pm
First Name: Kevin
Last Name: Pharis
Location: Sacramento CA

Re: Improved Akron-Hed sanity check

Post by Kevin Pharis » Sat Mar 14, 2020 1:59 pm

After a couple hundred hours designing and manufacturing the rocker system... all I can do is hope it’ll perform! So far everything looks promising as the head has many favorable design characteristics... 2 in, 4 out, cross flow, valves in line with the ports, and spark plug near the exhaust valve. The ports are relatively small when compared to other performance heads... but I think they’ll be plenty big enough to produce similar (or better) performance as the other 2 intake port overheads

Too late to give up now... I hope to have the head runnin later this year!!! That is... assuming I survive the pandemic...!?😉

User avatar

perry kete
Posts: 603
Joined: Sun Jan 06, 2019 11:46 am
First Name: Dennis
Last Name: Seth
Location: Jefferson Ohio

Re: Improved Akron-Hed sanity check

Post by perry kete » Sat Mar 14, 2020 2:20 pm

That looks great but I don't know why you went to all the trouble when the catalog has them for $67.50! :roll: :roll:
1922 Coupe & 1927 Touring


Topic author
Kevin Pharis
Posts: 317
Joined: Thu Jan 10, 2019 3:54 pm
First Name: Kevin
Last Name: Pharis
Location: Sacramento CA

Re: Improved Akron-Hed sanity check

Post by Kevin Pharis » Sat Mar 14, 2020 2:26 pm

Turns out that they only take silver backed bank notes... and the heads apparently have been discontinued for a few years!?🙄 :lol:

User avatar

John Warren
Posts: 635
Joined: Sun Jan 06, 2019 12:18 pm
First Name: John
Last Name: Warren
Location: Henderson, Nevada

Re: Improved Akron-Hed sanity check

Post by John Warren » Sat Mar 14, 2020 8:11 pm

Nice Work ! Thanks for sharing
24-28 TA race car, 26 Canadian touring, 25 Roadster pickup, 14 Roadster, and 11AB Maxwell runabout
Keep it simple and keep a good junk pile if you want to invent something :P

User avatar

AndyClary
Posts: 142
Joined: Sun Jan 06, 2019 11:15 am
First Name: Andrew
Last Name: Clary
Location: Usa
MTFCA Number: 24057

Re: Improved Akron-Hed sanity check

Post by AndyClary » Sat Mar 14, 2020 8:35 pm

I've been watching your progress and I think sanity may have left the room quite some time ago;). Did you figure what the compression would be? While the ports are a little odd shaped, it should certainly flow better than T ports.

Andy


Topic author
Kevin Pharis
Posts: 317
Joined: Thu Jan 10, 2019 3:54 pm
First Name: Kevin
Last Name: Pharis
Location: Sacramento CA

Re: Improved Akron-Hed sanity check

Post by Kevin Pharis » Sat Mar 14, 2020 9:23 pm

The Akron has a typical flat bottom combustion chamber just like all the other pushrod heads... and it measures a cavernous 1-5/16” deep. With a stock crank and pistons, I imagine the compression ratio would be somewhere around 3:1. And with the A crank and .060” overbore probably a staggering 3.1:1!!!

I’ve got a new set of pistons on the to-do list, lookin to maintain the 7.5:1 ratio I currently run with the flathead. Also on the list is a low lift cam to compliment the 1.5:1 rocker ratio. With the 1.750” valves, I’d like to run better than .300” lift at the valve. The plan is to work out a deal with a fella who has a flow bench. Not lookin to alter the head any, just lookin to figure the best lift for the design


Topic author
Kevin Pharis
Posts: 317
Joined: Thu Jan 10, 2019 3:54 pm
First Name: Kevin
Last Name: Pharis
Location: Sacramento CA

Re: Improved Akron-Hed sanity check

Post by Kevin Pharis » Sun Mar 15, 2020 3:09 pm

It’s no “show” polish... but it looks a whoooooole lot better than it did yesterday...!😉
Attachments
60176B51-B604-40E2-ABC1-7A07471844FD.jpeg
30494A2A-2EE4-4622-B670-7E4991026AA4.jpeg
5AFB0E05-E7A8-45B2-A1C0-6187CCB1DE36.jpeg


civinwt
Posts: 11
Joined: Sun Jan 06, 2019 4:54 pm
First Name: Bruce
Last Name: Hopkins
Location: Victoria BC Canada

Re: Improved Akron-Hed sanity check

Post by civinwt » Sun Mar 15, 2020 4:23 pm

Kevin, the (in)-sanity check looks fantastic. It would be a shame to mark up the top of the valve cover in any way, but some sort of marking to indicate who and where this set-up was conceived should be considered. You can now not tell that the cover is a 3 piece affair.

User avatar

AndyClary
Posts: 142
Joined: Sun Jan 06, 2019 11:15 am
First Name: Andrew
Last Name: Clary
Location: Usa
MTFCA Number: 24057

Re: Improved Akron-Hed sanity check

Post by AndyClary » Sun Mar 15, 2020 5:18 pm

7 1/2 is a good number. When you get to a flow bench I know a guy that lives near you with a couple of heads to compare it with. I suspect up to 3000 rpm it will come plenty well.

Andy


Wayne Sheldon
Posts: 1576
Joined: Sun Jan 06, 2019 3:13 pm
First Name: Wayne
Last Name: Sheldon
Location: Grass Valley Califunny, USA
Board Member Since: 2005

Re: Improved Akron-Hed sanity check

Post by Wayne Sheldon » Sun Mar 15, 2020 7:49 pm

"Sanity check"? I think you're crazy! But in a good way.

Aren't we all?


Topic author
Kevin Pharis
Posts: 317
Joined: Thu Jan 10, 2019 3:54 pm
First Name: Kevin
Last Name: Pharis
Location: Sacramento CA

Re: Improved Akron-Hed sanity check

Post by Kevin Pharis » Sun Mar 15, 2020 11:14 pm

With the valve cover done... all that’s left to do is...;

Finalize the push rod dimensions
Drill the last couple mounting bolt holes in the rocker supports
Notch the rocker shafts for the clamp bolts
Drill oil holes in the rockers
Rebuild the head
Machine new keeper grooves in the exhaust valves
Order custom intake valves
Order custom pistons
Design new camshaft
Build new header and exhaust system for the car
Build new intake to fit twin carbs
Build new hood to close up old header clearance and clear new header on opposite side
Freshen up the ‘ol motor so as to make all the magic happen
Paint everything to match
And finally... convince my wife it was all worth it!!!😉


Herb Iffrig
Posts: 551
Joined: Sun Jan 06, 2019 11:47 am
First Name: Herb
Last Name: Iffrig
Location: St. Peters, MO

Re: Improved Akron-Hed sanity check

Post by Herb Iffrig » Mon Mar 16, 2020 7:31 am

What is next, the exhaust manifold?


Topic author
Kevin Pharis
Posts: 317
Joined: Thu Jan 10, 2019 3:54 pm
First Name: Kevin
Last Name: Pharis
Location: Sacramento CA

Re: Improved Akron-Hed sanity check

Post by Kevin Pharis » Mon Mar 16, 2020 11:43 am

I have the original exhaust manifold... but my speedster is an outside exhaust kind of car😁. So planning on building a header flange. Header and tail pipe might get interesting with the steering box, alternator, water pump, and shift/e-brake levers all on that side...🤔


Topic author
Kevin Pharis
Posts: 317
Joined: Thu Jan 10, 2019 3:54 pm
First Name: Kevin
Last Name: Pharis
Location: Sacramento CA

Re: Improved Akron-Hed sanity check

Post by Kevin Pharis » Mon Mar 16, 2020 9:30 pm

Kinda like a “before and after” pic...
5CFA3B6A-A0A9-4298-AC93-293FB0EA52F3.jpeg


Topic author
Kevin Pharis
Posts: 317
Joined: Thu Jan 10, 2019 3:54 pm
First Name: Kevin
Last Name: Pharis
Location: Sacramento CA

Re: Improved Akron-Hed sanity check

Post by Kevin Pharis » Sun Mar 22, 2020 3:10 pm

How bout some header plates...?

Not sure what I’m doin yet... so made em outa stainless just incase😉
Attachments
584A4DFA-87FB-4F93-86B9-2DBD956FEF6F.jpeg


Topic author
Kevin Pharis
Posts: 317
Joined: Thu Jan 10, 2019 3:54 pm
First Name: Kevin
Last Name: Pharis
Location: Sacramento CA

Re: Improved Akron-Hed sanity check

Post by Kevin Pharis » Sat Mar 28, 2020 4:42 pm

Just about have all the other loose ends tied up, so now it’s time to get the pushrods figured out
Attachments
EE56FA33-91FD-40A5-9131-BA0F289E6980.jpeg


Topic author
Kevin Pharis
Posts: 317
Joined: Thu Jan 10, 2019 3:54 pm
First Name: Kevin
Last Name: Pharis
Location: Sacramento CA

Re: Improved Akron-Hed sanity check

Post by Kevin Pharis » Sat Mar 28, 2020 7:41 pm

Here’s a couple shots of the new keeper groove machined into the 351c valves that are going in the Akron’s exhaust. Also have custom .875” shorter valves on order that will go in for the intake.
Attachments
ACFBABFC-0E3F-4112-AADC-15B82E4383F6.jpeg
66FA539A-B2CE-42C8-9ED0-76B34CFE5F6D.jpeg

User avatar

ModelTSpeedster
Posts: 40
Joined: Mon Jan 07, 2019 7:13 am
First Name: Randy
Last Name: Brown
Location: Austin, Texas
MTFCA Number: 7352
Contact:

Re: Improved Akron-Hed sanity check

Post by ModelTSpeedster » Tue Mar 31, 2020 10:22 am

I am still looking for this cover for my Hal Akron head. A similar adaptation would really make yours pop!
Attachments
HAL1 cover.jpg


Topic author
Kevin Pharis
Posts: 317
Joined: Thu Jan 10, 2019 3:54 pm
First Name: Kevin
Last Name: Pharis
Location: Sacramento CA

Re: Improved Akron-Hed sanity check

Post by Kevin Pharis » Tue Mar 31, 2020 5:41 pm

I considered that logo (specifically the script) design... A LOT!!! And would love to have included some element of its design into my valve cover. But as you can see, ultimately settled on smooth as I wasn’t happy with anything I scribbled down. Besides... I could always carve out another one😁


Topic author
Kevin Pharis
Posts: 317
Joined: Thu Jan 10, 2019 3:54 pm
First Name: Kevin
Last Name: Pharis
Location: Sacramento CA

Re: Improved Akron-Hed sanity check

Post by Kevin Pharis » Tue Mar 31, 2020 5:50 pm

modeltspeedster wrote:
Tue Mar 31, 2020 10:22 am
I am still looking for this cover for my Hal Akron head
That early Hal cover is only about 1-2” deep, and could easily be carved from solid. With that picture and a few well spent design hours, you could have a brand new valve cover before the week is over...


Dan McEachern
Posts: 330
Joined: Sun Jan 06, 2019 11:08 am
First Name: DAN
Last Name: MCEACHERN
Location: ALAMEDA,CA,USA

Re: Improved Akron-Hed sanity check

Post by Dan McEachern » Tue Mar 31, 2020 7:21 pm

Kevin- there is a real straight forward tool in SW to transfer a picture image into a sketch. Happy to share if you want it. Dan


Topic author
Kevin Pharis
Posts: 317
Joined: Thu Jan 10, 2019 3:54 pm
First Name: Kevin
Last Name: Pharis
Location: Sacramento CA

Re: Improved Akron-Hed sanity check

Post by Kevin Pharis » Tue Mar 31, 2020 7:54 pm

That sure sounds a bunch easier than my usual way... but pics typically have some sort of distortion and can’t (shouldn’t) be trusted. I have “vectorized” pics in the past, then imported as a sketch only to create a geometrically sound version using the “vectorized” sketch as a guide

I know this is technically the old fashioned way... but from what I have experienced, I feel yeilds the best (and most time consuming) results. I am curious to see how SW handles this feature and look forward to checking it out


Topic author
Kevin Pharis
Posts: 317
Joined: Thu Jan 10, 2019 3:54 pm
First Name: Kevin
Last Name: Pharis
Location: Sacramento CA

Re: Improved Akron-Hed sanity check

Post by Kevin Pharis » Wed Apr 01, 2020 11:24 pm

Building push rods this evening... got an ‘ol stock cam and a couple solid lifters stuck in a block as a baseline. Pushrods are made from high tensile steel rod stock, with pressed on hardened chromoly cups. The 1/4” pushrods run in bushings that pass thru the intake ports and upper water jacket of the head. These bushings prevent the pushrods from following the swing of the rocker arms. So I have devised an upper pushrod link with ball cups at both ends that will allow the upper end of the pushrod to follow the swing of the rocker arm.

Got the intake side all set up and we are looking promising! The exhaust side is soon to follow...
Attachments
341556EF-188E-48F7-AFCD-612B47AB1DF3.jpeg
A48450D5-2786-4D90-951A-663E770C2075.jpeg


Dan McEachern
Posts: 330
Joined: Sun Jan 06, 2019 11:08 am
First Name: DAN
Last Name: MCEACHERN
Location: ALAMEDA,CA,USA

Re: Improved Akron-Hed sanity check

Post by Dan McEachern » Thu Apr 02, 2020 3:07 am

Some 16 Valve Roof heads used a similar arrangement on the pushrods although not that elegant.


Topic author
Kevin Pharis
Posts: 317
Joined: Thu Jan 10, 2019 3:54 pm
First Name: Kevin
Last Name: Pharis
Location: Sacramento CA

Re: Improved Akron-Hed sanity check

Post by Kevin Pharis » Thu Apr 02, 2020 12:51 pm

I know that the Roof 16 used a short link to connect the rockers to the valve tips... but just found these patent drawings showing the 2 piece pushrod design used on the A version of the Roof 16 heads
50E421DC-A119-4572-8C97-4E7F9E5EDA26.jpeg
7A6B1148-51EB-4C46-95D2-7C7CB3EDB9BB.jpeg
The bummer about this design, is that the pushrod needs to be a tight fit in the guide to prevent vacuum leaks at the guide... but this prevents the pushrod from swinging with the arc of the rocker arm. I imagine the A version Roof 16 valve train must have been problematic at higher speeds, and all the vacuum leaks must have been a pain at idle.

The Akron has a similar design system with the pushrod exposed to the intake port... except that the Akron didn’t use a “rocker”, and so the pushrod didn’t need to swing during operation. It does have a tube installed that passes thru the intake port to pilot the pushrod, but this tube is ultimately open to the port at the bottom. I intend to fill the bottom of the port with enough epoxy to seal off this tube and eliminate the associated vacuum leaks


Scott_Conger
Posts: 2668
Joined: Sun Jan 06, 2019 11:18 am
First Name: Scott
Last Name: Conger
Location: Clark, WY
Board Member Since: 2005

Re: Improved Akron-Hed sanity check

Post by Scott_Conger » Thu Apr 02, 2020 2:54 pm

What am I missing here? All T's have leaks at the pushrod and valve guides. You are probably aware, but others may not be, that excess clearance/wear at the guides is the primary reason that some Model Ts smoke so profusely at idle after a good run, but do not appear to smoke when out on the road. It is usually misdiagnosed as bad rings with lots of time and money thrown at the engine with no positive remediation of the original problem of smoking and may in fact make it smoke worse at idle.
Scott Conger

Full Flow Float Valves - deliver fuel like Henry intended!


Les Schubert
Posts: 522
Joined: Thu Jan 10, 2019 5:47 pm
First Name: Les
Last Name: Schubert
Location: Calgary

Re: Improved Akron-Hed sanity check

Post by Les Schubert » Thu Apr 02, 2020 4:16 pm

Kevin
I have a Roof 8 (Laurel model 40) and the pushrods are essentially similar to your posting. The bottom of the pushrod essentially resembles a valve stem with a hole drilled into the top about a 1/2”. The rest of the pushrod is about 3/16” diameter and then the “cup tip” is at the top. I remade the lower stem parts (Years ago) and had to make one of the top halfs. Made that in 2 pieces and welded it together. LOTS of miles on it.
One other thing. The rocker arms are REALLY hard and long lasting material. The shafts are mild steel and are essentially a “consumable”.
I hope this helps


Scott_Conger
Posts: 2668
Joined: Sun Jan 06, 2019 11:18 am
First Name: Scott
Last Name: Conger
Location: Clark, WY
Board Member Since: 2005

Re: Improved Akron-Hed sanity check

Post by Scott_Conger » Thu Apr 02, 2020 6:48 pm

rereading again about the rocker requiring the rod to swing is exactly what I didn't understand. DOH! Reading comprehension 101... :(

my last post is pretty much pointless in the discussion...sorry about that.
Scott Conger

Full Flow Float Valves - deliver fuel like Henry intended!


Topic author
Kevin Pharis
Posts: 317
Joined: Thu Jan 10, 2019 3:54 pm
First Name: Kevin
Last Name: Pharis
Location: Sacramento CA

Re: Improved Akron-Hed sanity check

Post by Kevin Pharis » Fri Apr 03, 2020 12:16 pm

After 6 months of obsessing over this darn Akron-Hed... I’ve finally finished the rocker arm conversion!!!

Now to start rebuilding the head. Next stop... hard seats, guides, and surfacing. Then I will spot face all the head bolt pads so the adapter plate has a good surface to sit on. And that should be the extent of the work on the head. I was really careful while designing the adapter not to require any head modifications... just incase all this nonsense didn’t work, I didn’t want to become one of those guys who destroyed a hens tooth because of a so called... “good idea” ;)

This winter I’ll pull the motor and start the freshen up. New custom dome pistons, fresh babbit, and a good look over for the transmission are on the list of to-do’s. Also will have my old cam mapped, and a new cam ground to match the old profile while accounting for the 1.4:1 rockers

Post Reply Previous topicNext topic