Shoptalkforums.com

Wally wrote: ↑Sun Jun 13, 2021 12:14 pm

wreck wrote: ↑Sat Jun 12, 2021 11:33 pm they look are great looking castings , not sure if its been raised before but what style of cooling system are you planning on running ?

Don't know yet tbh, it seems less important at this stage with so many other jobs still. Suggestions?

I'm biased to my own creation on shrouds but I think a Horizontal system with the internal vanes on the shroud guiding air to either side of the intake ports so all the head fins get airflow would be my suggestion .

Wally wrote: ↑Sun Jun 13, 2021 12:10 pm

Richie wrote: ↑Sat Jun 12, 2021 11:58 pm Looking very good! Are the new castings also heat treated? Keep up the excellent work!

Good question, in fact the foundry asked the same one. But heat treating came with a warning that some edges (fins?) of other parts may droop or have different sizes afterwards... I didn't want to risk that at this stage so for this first one(s), it will just be as cast. If lateron it may found to be benificial, we can always try it in a later batch.

Yes, it is my understanding that all things like shrinkage, warping and core-shifting have to be considered into the desing of the moulds. I can understand it is o.k. for now when used for designing and fitting all the parts that are necessary to make it function. But for now I think you would make Ludwig proud! You are making awesome steps! Kudos!

Woah! I remember years ago browsing the apfelbeck website and dreaming about massive T4 motors (still dream about that honestly) awesome to see these still moving along and developing.

Been a few months, but the first head has been machined and its all stored in a CNC program, so the next heads should all be very equal and take less time. So far I could only detect two very small errors which doesn't even need to be cured with the casting, but just some further machining would solve that.

Most all old parts fit like a glove!


I also tried if everything moves freely:


I am still having a hard time finding the right valve sizes tbh though:
Intakes: 36mm, 7mm stem in 112,5-113,0mm length,
Exhaust: 42mm, 7mm stem (or 8mm if need be, but those are heavy), same length.

should not be too difficult you'd think?
Hope to find something stock from another car. If anyone has a idea or source (car,make, model), pls let me know.

The 98mm biral (AA) cylinder fits as well and the fins flow nicely in sync with the curves of the head fins. Yes, I'am nerdy





Just the spark plug needs to be machined slightly less deep next one (or an extra shim for just this one )

Wally,
that looks so cool.
If you need a car to test them in... hahaha

I know the old alfa nord engines have replacement 7mm stem valves, only don t know the lenght.

Exciting!
I'll look around for those valve sizes.
Great machining job!

Wally, it looks like late 70s honda 1.8 engine has an intake valve that's very close to your needs

I see a Renault exhaust valve that's 40.1 X 7 X 112, and another that's 43.9 X 8 X 112
Ford has a variety of 42 X 8 X 113 and x112 intake valves, not sure you could run those as an exhaust?

Thanks for the idea guys! 8mm valve stems get heavy pretty quickly, so I hope I don't need that size.
I think it will probably come down to some custom Ferrea valves (blanks), which is ok as well for this purpose. After all this effort, I don't want to compromise on valves.

Insane project Walter! This would really be an unique engine when its running. Just curious, (could be that missed it), but how do you guys plan to make sure the cams align perfectly?

There are a few valve catalogues around, TRW had one a few years back that had all the details, sizes etc.
SI have one too although not that comprehensive but you never know what you can find.
http://sivalves.com/catalog.html

Thanks Andreras, seems a very complete source!
For now, the first head will probably be done with Ferrea blanks after all as that is what the machine shop uses a lot.

Hi Mark,
Cam alignment is indeed an important one and also something that is hard to engineer completely beforehand (if it was enough).
For now, there will be a thick, very sturdy 7075 H6 cylinder bank plate on top (8 ARP studs, 4 thicker dowels) to connect both heads. The connected intake manifold (per bank) and excellent machining of the case, cylinder and heads should do the rest.
But only (testing) time will tell of course...

Happy to report that all 4 heads have now been cast and machined!

So finally could test fit 4 actual (new) heads

Pictures for those without FB





Next stop will be having the camshaft (blanks) made and the intake manifolds now I have two heads installed per side for measurements

Stunning, what a great job !

Perseverance paid off, it will be a beast

Always loved these images in his book, it's great how you got this done