F1 Cylinder Head Design and Pneumatics, a closer look

[strad]

Alright you math whizzes..
Is there a way to calculate the burn time at say 10 or 11 thousand rpm?
Statically you about a 1.5 to 1 rod length to stroke ratio but as rpm goes up I'm thinking it's slightly different. 1.7 or 1.3,, which way.

[schmidtmotorworks]

Does anyone have any thoughts on why the head was cast with the deck facing upwards?

In my experience the deck goes down and it fills from below the deck and flows into risers above the head bolts and valve guides.

[hondaballs]

Am I seeing a 55° intake seat and 65° exhaust?

[gruntguru]

Both 40* I think.

[hondaballs]

That seems very odd if that's true.

[GeoffH]

Just spotted this was posted a year ago to the day, what a fast year

Since sectioned the head in two other places - will host images this evening,

Brian,

Hi Brian.

I hope you are well and just very busy with work? I saw the above post from you back in August I think?

I must admit your insight into this cylinder head is intriguing & I must compliment you on a job very well done, I find it absolutely fascinating.

Without putting any pressure on you I just wondered when we might see the next instalment?

Geoff

[hondaballs]

It seems to me it's 55 and 65 from this picture

Just to start adding the info before it piles up.

First, the seats

http://i150.photobucket.com/albums/s92/ ... 05aafd.jpg

http://i150.photobucket.com/albums/s92/ ... c5f02f.jpg

An overview,

http://i150.photobucket.com/albums/s92/ ... 11215f.jpg

http://i150.photobucket.com/albums/s92/ ... 57537f.jpg

http://i150.photobucket.com/albums/s92/ ... c05207.jpg

The intake port sides are straight for most of the way. The floor is straight until indicated below with the blade in the SSR shot,

http://i150.photobucket.com/albums/s92/ ... 0f2995.jpg

Close-ups of the various details - use ruler for sizing - It will give the opportunity to take real dimensions from any location without having to list,

http://i150.photobucket.com/albums/s92/ ... bcdacd.jpg

http://i150.photobucket.com/albums/s92/ ... 568843.jpg

http://i150.photobucket.com/albums/s92/ ... 38f63a.jpg

http://i150.photobucket.com/albums/s92/ ... ca03b7.jpg

http://i150.photobucket.com/albums/s92/ ... 4aad09.jpg

http://i150.photobucket.com/albums/s92/ ... 2f7907.jpg

http://i150.photobucket.com/albums/s92/ ... 8ba301.jpg

Lots more to add yet including cross-sections, volume, angles and valve sizes but its on the way.

Ive made up my mind also to perform some other flow tests as well as flowbench tests using either particle image velocimetry, or ink trace - In both cases a clear casting is made of the port/chamber and you can then view the flow/turbulence within it.
Ill get the hard measures mentioned above out of the way first. These should give good insight - the rest Ill share in 3d form once I get the silicone scanned.

More very soon,

Brian,

[GeoffH]

Hi Brian.

Nice to see you are still around and that you have posted more information.

I am actually thinking of undertaking a similar project if I can get hold of a suitable donor cylinder head.

I take it you didn't just take a hacksaw to the cylinder head? I assume you used a powered saw of some type with the head held rigidly. After cutting did you do any other surface treatment like milling?

Keep up the good work, I look forward to see your future information, especially the 3D data.

Geoff

[gruntguru]

It seems to me it's 55 and 65 from this picture

First, the seats
http://i150.photobucket.com/albums/s92/ ... 05aafd.jpg
http://i150.photobucket.com/albums/s92/ ... c5f02f.jpg

The "seats" are the 40 degree section in each photo. The seat width is indicated by the pair of blue dimensioning lines and the number in blue i.e. 1.5mm exhaust and 1.2mm intake.

[Brian.G]

Hi Brian.

Nice to see you are still around and that you have posted more information.

I am actually thinking of undertaking a similar project if I can get hold of a suitable donor cylinder head.

I take it you didn't just take a hacksaw to the cylinder head? I assume you used a powered saw of some type with the head held rigidly. After cutting did you do any other surface treatment like milling?

Keep up the good work, I look forward to see your future information, especially the 3D data.

Geoff

Geoff,

Indeed, extremely busy with work - hope my messages cleared up cutting issues.

Will complete this thread sometime this year - when Im not sure but I will do it once I get some spare time. I never thought it would be still trending today.

Brian,

[riff_raff]

Looks like the seats are BeCu. It's amazing that they got those thin section seats to stay put in the cylinder head, especially the 2.4mm wall seats used on the intake side. With such a thin radial wall section the amount of interference fit you can use when installing the seats is limited. Too much interference and the thin section seat will yield.

[J.A.W.]

Or were the seats placed in situ & the head was then cast around them?

[IVX8]

Excellent engineering analysis. I am struck by the high quality of the castings, at least compared to the ones I receive from my foundry. I very much appreciate the work on the oil system, this is such a major part of the thremal management. I learned a lot. Thanks you.

[Tommy Cookers]

Looks like the seats are BeCu. It's amazing that they got those thin section seats to stay put in the cylinder head, especially the 2.4mm wall seats used on the intake side. With such a thin radial wall section the amount of interference fit you can use when installing the seats is limited. Too much interference and the thin section seat will yield.

not really
call it BeCu orCuBe, it is a rather high strength material with an unusually low Elastic Modulus
so its yield strain is very high, it can be close to 10000 ppm
so has more scope in interference fitting than almost anything else ie it's very suitable for thin walls
and it has outstanding thermal conductivity of course

btw this is 2% Beryllium and very resilient (totally the opposite of high Be alloys that are banned as intolerably bad in fatigue)

[Brian.G]

Excellent engineering analysis. I am struck by the high quality of the castings, at least compared to the ones I receive from my foundry. I very much appreciate the work on the oil system, this is such a major part of the thremal management. I learned a lot. Thanks you.

Thanks for taking the time to sign up and type the above - you are welcome.

The seats are indeed Beryllium Copper(Alloy 25, - 98% Cu,) and made by Delwest(name visible on interference perimeter)

Brian,