The Ford Barn

RalphM · 12-02-2018, 01:22 PM

along the row of valves, since the valves open the other way (up for open, down for closed), are they opened by spring pressure and closed by the cam

Actually the opposite, The valves are opened up by the cam and closed by the spring pressure. The big advantage of this type of a cylinder head is airflow. It increases the performance of the Flathead which is limited by its original design. Remember also that the old valve pockets in the block will have to be sealed up for this to work.

Licensed to kill · 12-02-2018, 03:19 PM

Quote:

Originally Posted by RalphM

along the row of valves, since the valves open the other way (up for open, down for closed), are they opened by spring pressure and closed by the cam

Actually the opposite, The valves are opened up by the cam and closed by the spring pressure. The big advantage of this type of a cylinder head is airflow. It increases the performance of the Flathead which is limited by its original design. Remember also that the old valve pockets in the block will have to be sealed up for this to work.

AH, OK. I went back and looked a the picture again and I now see that the head is about 4 inches thick and that the intake and exhaust manifold bolt directly to the head, jot to the block as before. It's no longer a "flathead" as it would have a combustion chamber in the head and what could be loosely termed as over head valves. Got it. thanks

Shu47 · 12-02-2018, 07:27 PM

It might be an interesting engine to some or maybe even many but to me it is no longer a flathead and therefore I am not interested. I am not bashing so please nobody get upset … just expressing my opinion.

JSeery · 12-02-2018, 07:32 PM

Quote:

Originally Posted by Shu47

It might be an interesting engine to some or maybe even many but to me it is no longer a flathead and therefore I am not interested. I am not bashing so please nobody get upset … just expressing my opinion.

That's how I look at it as well, cool technology, but no longer a flathead.

tubman · 12-02-2018, 08:04 PM

Oxymoron.

Ol' Ron · 12-03-2018, 10:28 AM

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Most overhead cams run directly on the valved. However there is a cup that fits over the valve stem and spring that slides up and down in a plate that is bolted to the head. this also holds the cam bearings and the cup rides on the lobes. What makes this desirable is the light weight of the valve assembly allows the engine to rev higher. also having two intake and exhaust valves create a
Pent roof" chamber which allows for a 'Squish" ares for increased compression. Probably the most famous engine of this type was the 4cy Offy that dominated Indy for decades.

Ronnieroadster · 12-03-2018, 03:49 PM

Quote:

Originally Posted by JSeery

That's how I look at it as well, cool technology, but no longer a flathead.

Heck just consider it a fathead.

itslow · 12-03-2018, 04:04 PM

Quote:

Originally Posted by Licensed to kill

It's no longer a "flathead" as it would have a combustion chamber in the head and what could be loosely termed as over head valves. Got it. thanks

It wouldn't "loosely" be termed as an OHV head. It is an OHV head.

FWIW, the Ford flathead engine has its combustion chamber in the head, too. The location of the combustion chamber isn't what determines whether or not an engine is considered a "flathead".

12-02-2018, 01:22 PM	#21
RalphM Senior Member Join Date: Nov 2015 Location: North Pole, Alaska Posts: 2,651	Re: Dual Overhead Cam Flathead along the row of valves, since the valves open the other way (up for open, down for closed), are they opened by spring pressure and closed by the cam Actually the opposite, The valves are opened up by the cam and closed by the spring pressure. The big advantage of this type of a cylinder head is airflow. It increases the performance of the Flathead which is limited by its original design. Remember also that the old valve pockets in the block will have to be sealed up for this to work.

12-02-2018, 07:27 PM	#23
Shu47 Senior Member Join Date: Feb 2011 Location: Maltby, Washington Posts: 187	Re: Dual Overhead Cam Flathead It might be an interesting engine to some or maybe even many but to me it is no longer a flathead and therefore I am not interested. I am not bashing so please nobody get upset … just expressing my opinion.

12-02-2018, 08:04 PM	#25
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 10,312	Re: Dual Overhead Cam Flathead Oxymoron.

12-03-2018, 10:28 AM	#26
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,859	Re: Dual Overhead Cam Flathead Sponsored Links (Register now to hide all advertisements) Most overhead cams run directly on the valved. However there is a cup that fits over the valve stem and spring that slides up and down in a plate that is bolted to the head. this also holds the cam bearings and the cup rides on the lobes. What makes this desirable is the light weight of the valve assembly allows the engine to rev higher. also having two intake and exhaust valves create a Pent roof" chamber which allows for a 'Squish" ares for increased compression. Probably the most famous engine of this type was the 4cy Offy that dominated Indy for decades.