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Bob Garretson's idea 3 piece Carrera Cylinder Head work completed.

Posted: Mon Feb 22, 2021 2:26 pm
by Ibrahim Kuzu
After four years with many designs and changes, we had success on 3 piece Carrera 4 cam cylinder head casting and machining.

Now we have a 4 Cam Carrera cylinder head that racers and drivers can enjoy, not to worry getting their original one piece head damaging or having big expensive welding repairs .

On 3 piece cylinder head ,each piece can be exchanged incase one section gets damaged.

We pour castings out of A356-T6 which is an aerospace quality primary aluminum alloy. The cylinder head utilizes a cast aluminum chill to produce a superior grain structure for heat resistance. The castings are poured at 1500 degrees Fahrenheit. The castings are then heat treated at 1000 degrees Fahrenheit and quenched in water to provide excellent material properties.

Please enjoy the crazy work went in to the casting ,specially the so thin and close to each other cooling fins......
IK
4 Cam Cooling

Re: Bob Garretson's idea 3 piece Carrera Cylinder Head work completed.

Posted: Mon Feb 22, 2021 2:38 pm
by Jacques Lefriant
BZ!
j

Re: Bob Garretson's idea 3 piece Carrera Cylinder Head work completed.

Posted: Mon Feb 22, 2021 2:46 pm
by Ibrahim Kuzu
Appreciate it very much Jacques.
IK

Re: Bob Garretson's idea 3 piece Carrera Cylinder Head work completed.

Posted: Mon Feb 22, 2021 2:54 pm
by Jacques Lefriant
HI
do we need to use longer head studs?

Re: Bob Garretson's idea 3 piece Carrera Cylinder Head work completed.

Posted: Mon Feb 22, 2021 3:12 pm
by Martin Benade
That’s an outstanding project, looking good! I wish I needed some.

Re: Bob Garretson's idea 3 piece Carrera Cylinder Head work completed.

Posted: Mon Feb 22, 2021 3:18 pm
by Ibrahim Kuzu
No Jacques. Original head studs stays on the Engine case.
There will be two options to bold the Cam box to the cylinder heads.
Great question.
Thank you,
IK

Re: Bob Garretson's idea 3 piece Carrera Cylinder Head work completed.

Posted: Mon Feb 22, 2021 3:20 pm
by Ibrahim Kuzu
Thank you Martin.
IK

Re: Bob Garretson's idea 3 piece Carrera Cylinder Head work completed.

Posted: Mon Feb 22, 2021 4:05 pm
by Joris Koning
Very cool!

Re: Bob Garretson's idea 3 piece Carrera Cylinder Head work completed.

Posted: Mon Feb 22, 2021 4:49 pm
by Ibrahim Kuzu
Thank you Joris...
IK

Re: Bob Garretson's idea 3 piece Carrera Cylinder Head work completed.

Posted: Mon Feb 22, 2021 5:41 pm
by Bill Richardson
Ibrahim,
Fantastic parts and machining, as well as casting!
Very nice and a great idea

Re: Bob Garretson's idea 3 piece Carrera Cylinder Head work completed.

Posted: Mon Feb 22, 2021 7:10 pm
by Ibrahim Kuzu
Thank you Bill.
Apricated your help on some original machining dimensions need it for confirmation.
IK

Re: Bob Garretson's idea 3 piece Carrera Cylinder Head work completed.

Posted: Mon Feb 22, 2021 7:16 pm
by Martin Benade
Is that a permanent mold type or lost foam/wax or something else?
You are not casting them yourself are you? If so you are having waaaay too much fun. ( actually you are anyway)

Re: Bob Garretson's idea 3 piece Carrera Cylinder Head work completed.

Posted: Tue Feb 23, 2021 12:59 am
by Wil Mittelbach
Ibrahim -
An admirable and suberb accomplishment. Kudos!

Re: Bob Garretson's idea 3 piece Carrera Cylinder Head work completed.

Posted: Tue Feb 23, 2021 5:13 am
by Harlan Halsey
Hello Ibrahim,
Bob told me about the 3 piece head project years ago. I assumed that it had been abandoned. I was not aware that you were now working together. At the time I believe that he was going to cast smaller intake and exhaust passages to optimize the power band lower. As you know the Carrera is a 9,000 RPM head on a 6,000 RPM bottom end. There have always been two problems with the reproduction of 356 heads: the high aspect ratio of the fins on both the pushrod and the Carrera heads, and the oil passage "tree" in the Carrera heads. Obviously you have solved the aspect ratio issue, and I suspect that the tree has been eliminated, replaced by drillings o-ringed at the junctions of the three parts.
Now, if you figure out how to put a plain bearing crank into the 547 case, we could have an improved 7.500 RPM Carrera engine!

Re: Bob Garretson's idea 3 piece Carrera Cylinder Head work completed.

Posted: Tue Feb 23, 2021 8:51 am
by Joris Koning
Harlan Halsey wrote:
Tue Feb 23, 2021 5:13 am
Now, if you figure out how to put a plain bearing crank into the 547 case, we could have an improved 7.500 RPM Carrera engine!
Harlan, this has been done and is currently being done. Perhaps Jeff will chime in and share.