I am in the process of rebuilding the engine for my racer and was turned onto
a company that impregnates a polymer coating into/onto a variety of engine
components. The most significant benefit being the reduction of engine heat
that effects and reduces the life of expensive parts. In the case of a U20
engine it will virtually eliminate chain stretching. The information
originally came from Malvern Racing, David Webber, www.malvernracing.com, a
long time Datsun/Nissan racer and race car preparer located in Virginia (by
the way, if you need forged pistons, Malvern has them in stock). The web site
for the coating company is www.polydyn.com. In the message stream below are
quotes for doing a variety of engine components for the U20 engine.
thxx
Bob Davis
67.5 2L
Vintage Racer
----- Original Message -----
From: Carl Benton
To: Bob Davis
Sent: Monday, June 24, 2002 7:40 PM
Subject: Re: coatings
Bob
First the machine work needs to be finished. Check the rod and main bearing
clearances,piston to cylinder wall clearances,valve job finished,valve guides
size for the new valves and make sure the cylinder head deck is true and flat.
Send your parts for coatings.
Crankshaft counterweights coat with PolyDyn PD-14
Silver..........................................$ 115.00
Camshaft coat with PolyDyn
DL...........................................................................
......$ 30.00
Timing Chains coat with PolyDyn PD...
ea...................................................................$ 15.00
Timing Gears coat with PolyDyn
DL..............................................................all 3 for....$
25.00
Chain Guides and Chain tensioners do not coat.
Cam Followers coat with PolyDyn
DL............................................................each.......$
3.50
Valve springs coat with PolyDyn
DL.......................................................per each pc.....$
1.75
Rod bearings coat with PolyDyn
DL......................................................set of 4 jor........$
16.50
Main bearing set coat with PolyDyn
DL.........................................................................$
33.00
Piston coat skirts with PolyDyn RP,tops with PolyDyn HS comp
Gold.........each.............$32.00
Cylinder head and valves coat with PolyDyn HS comp Gold combustion chambers
and exhaust ports,face of
valves.......................................................................
..per chamber...........$ 35.00
Best Regards
Carl Benton, Polymer Dynamics Inc.
713-694-3296 office
713-694-6915 fax
Bob Davis <rdavis4@cfl.rr.com> wrote:
I race a 2 litre 4 cylinder overhead cam Datsun roadster and am in the
process of an engine rebuild. Needless to say, new parts are scarce and
expensive, especially timing chain components. At what point in the
rebuild/machining should coatings be applied and what is the apprx. costs?
- Crankshaft (5 main)
- Camshaft (new)
- 2 Timing Chains (new)
- 3 Timing Gears (new)
- 2 Chain guides (new). These have a hard rubberized surface the chains run
across.
- 2 Hydraulic Chain tensioners (new) - These have some kind of hard
rubberized blocks that the chains run across.
- 8 cam followers (rocker arms)
-Valve springs (dual)
- Rod and main bearing shells
- Forged pistons (new)
- 8 Valves (new)
- Cylinder head (aluminum)
thxx
Bob Davis
67.5 2L
Vintage Racer
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