Posted by Steve Kanavas on Thursday, February 08, 2001 at 11:46AM :
In Reply to: A few Engine Questions and a New Idea posted by Drew Rogers on Thursday, February 08, 2001 at 0:29AM :
Just my 2 cents worth but,,
Valve seats were flame hardened, but by now, valve jobs over the last 50 years have probably cut through the effective case hardening. They're ok for unleaded but at stock power(heat)levels. You can add PM or Stellite seats to the block. Mine does hills at 12 mph!
No sodium valve stems. These were used on the 251 and 265 industrial engines.
Weak spot is the crank. Also the long spindly rods.
Max sustained rpm is about 2500
The oil pump sizing is marginal. Adding a turbo will take too much flow from the system, starving the crank/rods.
The real problem is that the flathead has a long stroke and a very slow combustion chamber as the chamber has about 4 miles of surface area. Any manifold pressure increases must be compensated for by way retarded ignition and much greater octane fuels to push the deadly detonation threshold away. Good luck running 100LL on the street, especially at about 2.50/gallon. Don't get caught by the federales putting it in a road vehicle. It might live if you keep the boost down to 3-4 psi. This level wouldn't show much in power increases though.
If I were to hot up the flattie, I'd just feed it a better cam, cool hi compression head, split exhaust and a nifty dual carb setup. Will cost a ton more than your turbo setup though.
I'm sure the others here can give you more in depth experience on hyping the 230.
sak
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