I had the same problem with my BN1. Granted it's not the same, but if I got
even close to 190 around town, the car would buck and jerk and backfire
and embarrass the hell out of me. Once out on the road though, it would calm
down and run just fine. It would run fine even over 200 degrees if I was
going down the freeway on long trips. I installed a marine bilge fan that
sucked in cold air from right behind the grill and then blew it directly on to
my front float bowl. Cured the problem right away. I got the bilge fan off
of ebay for about $26, painted it flat black and it took a couple of hours
to install. Have an on/off switch inside the cockpit sitting on my parcel
shelf and if the car gets close to getting hot, I turn it on and problem
solved. I have now just installed a new fan I got from David Nock at British
Car Specialists and what a difference. This thing really moves the air and
since installing the new fan, I haven't had to use the bilge fan. I'm sure
I will need it when summer rolls back around and I get stuck in LA traffic,
but this worked for me, so it might be worth a shot for you.
If you'd like photos, let me know and I'll send some out.
Steven Kingsbury
BN1 #598
In a message dated 11/21/2011 7:23:30 A.M. Pacific Standard Time,
warthodson at aol.com writes:
I agree with your analysis & that is what we thought the problem was too.
It
is true that if he lets the car cool down when sitting or if he can get it
up
to a decent speed for a long enough time while it is bucking it will
eventually clear up. But this is almost impossible because of the
extreme/serious bucking. However, as I said, his fuel line runs down the
right
side of the frame & across to the carbs in the stock BJ7 location. The HD8s
including intake manifold, heat shield insulating spacers are all stock.
The
fuel pump should run continuously if the fuel is boiling in the float
chambers. It is not. The car is not running hot. He is using premium fuel
& we
have drained the tank & re-filled with other brands of fuel. We have
checked
the entire fuel system for restrictions, clogged filters faulty pickup
tubes,
etc. This only happens to his car. When we are traveling in a group (same
conditions) & it does not happen to any of the other cars including several
BJ7s & BJ8s.
Currently, I am leaning towards the sticky valve guide theory. However, I
do
not know how to verify this theory. Any suggestions?
Gary
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