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INFORMATION page on Kenneth
Nylén alias "Grottis" (Sweden)
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Web page by Anthony
Hyde
Tragically Grottis passed away in
a motorcycle accident in 2003. His company's former website was
www.grottisheadservice.se
Rolf Ohberg writes:
"Grottis built the best GrA cyl-heads ever built ! He made all the
heads for the Magnum Team, and later on for VMS (Volvo Motorsport)
because they where the BEST.
Grottis heads were
based on the 405 (special VMS spec 405 with smaller coolant
passages). Later VMS heads are based on the 531 design. Grottis heads
are stamped with his name and No. Apparently the modified 531 Grottis
head had a 60 cc combustion chamber volume.
Volvo B21
Group A cylinder head modification
(Careful English translation of former Grottis Head Service webpage
by friends of Anthony) - VMS = Volvo Motor Sport
The Chief of VMS race division Bo
Vikås rang on January 1986 and asked if I could port
(modify) 40 cyl-heads for four Group A cars.
I had made a test cylinder head for
them in summer of 1985 and it turned out my cyl-head gave 10%
more power over the whole rpm range.
I accepted the job, and modified (so
many) Volvo cyl-heads it was almost too much.
I finished in July, Volvo won, and
people called the car the flying brick.
Year after (in) 1987, I
modified *24 cyl-heads but this time I didn't have to do the
combustion chamber, as they had them CNC machined, (which was
good).
* (Reportably Porsche designed the
combustion chambers)
Chefen for raceavdelningen
Vikås ringde mig i Januari 1986 och frågade om jag kunde
porta 40 st Volvo toppar till 4 st Volvo Gr A bilar.
Jag hade gjort en test topp till dom sommaren 1985 och det visade sig
att min topp gav 10% mer effekt over hela registret.
Jag tackade ja, portade Volvotoppar så jag holl på att
kvåvas.
Blev klar i Juli, Volvo vann och blev kallad den flygande
tegelstenen.
Året efter 1987 portade jag 24 toppar då slapp jag porta
forbrånningsrummet for dom var cnc fråsta,
skont.
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Click
pics to enlarge
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Hand crafted quality
workmanship of Volvo 405 combustion chambers
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TRIBUTES
The fun part is that he, the little
alone guy, managed to beat Volvo´s own engineers and tuners at
their home field. Grottis was THE MAN in Scandinavia when it came to
heads, and almost every important race car or modified car had a
Grottis head.
His heads have won, except the
"flying brick":
Prostock:
Swedish championships / Scandinavian championships / European
championships
Superstock:
European record
Roadracing / superbike:
Swedish championships, German championship
He was nothing but a living legend
during his life. One of the worlds greatest engine
builders/headtuners and he deserves all credit he can get.
The nickname Grottis comes from the Swedish word grotta which
translates to cave. The analogy if you look at a cylinder head
intake/outlet the resemblance to a cave is obvious. A English
nickname would be like "Cavie" or "Cave man" perhaps, although
it´s pretty hard to find an equal translation.
Even his nickname had to do with
cylinder heads, he was a true original...
Andreas Eriksson,
Stockholm
Readers - if you can share information, please
email Anthony
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240T GpA Specs page
