Sounds to me like a fuel delivery problem. When you hit 4K and it
won't go any faster, immediately shut off motor and coast to a stop
and check float bowls. Probably empty. My guess is rust in the tank
clogging your fuel pump reducing flow rate. All these fuel additives
like oxygenators and ethanol introduce more water into the fuel. Our
tanks are rusting from the inside out!
Alan
On 6/16/11, Bob Spidell <bspidell at comcast.net> wrote:
> I noticed on my most recent long road trip that my BJ8 seemed to be running
> out of HP and/or torque on long uphill grades. I seem to get to about 4K RPM
> then the engine won't rev any more (yes, I downshift as required--it just
> seems the engine should be able to rev a bit more to go with the low-end
> torque). The engine is mostly stock--except for aftermarket air and oil
> filters and Pertronix ignition--and has about 80K miles on a rebuild.
> Cylinders were bored 0.030" over from an earlier rebuild. The cam is the
> mildest of 5 grinds offered by Crower; slightly lopey at idle but generally
> smooth and responsive (about 252deg overlap at 0.050"). I have a Lempert
> 3.54 rearend installed, which of course has a significant impact. The
> exhaust is made of Ansa pipes with newer glasspacks stitched in--I believe
> it flows reasonably well.
>
> Anyway, I'm starting to think about the next rebuild and wondering what
> might address this issue. I know headers, Webers, etc. would address
> breathing issues, but I want to keep stock intake and exhaust. What would
> help this engine's apparent emphysema; more radical cam, Al head, shorter
> exhaust system, lightened flywheel, higher CR, ...? I don't want to build a
> racer, just want to address the wheezing at higher RPMs. IOW, I'm willing to
> trade (a little) bottom end torque for a bit more top end.
>
> Bob
>
> --------------------------------
> Bob Spidell - San Jose, CA
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