I have a BN1, so things are a bit different, but temps under the bonnet get
way up there and my front float bowl is directly over my exhaust without a
heat shield. In the past, my car would vapor lock like crazy, the fuel in
the front float bowl boiling away. I was a member of the SoCal Healey club
then and a few of us were having the same problem. Nothing seemed to work.
And then George McHarris came up with the solution. And I followed suit and
haven't had the problem since.
What we did was mount a marine bilge fan along side the upper end of
our radiators. Being it's a DC motor, just wire it so the air flows in the
correct direction and add some 4" flex to both ends. One end goes to right
behind your grill to suck in the cooler air and the other end off the fan
goes to right in front of your carbs. Mine is aimed directly at the front
float bowl. Did this almost ten years ago now and have had zero problems since
with vapor lock. I can sit in traffic and get to 212 and the car still
idles just fine.
I put the fan in place with zip ties, so didn't have to drill any
holes and everything can come out in a matter of minutes if necessary. Got the
fan on eBay under thirty dollars and since it was white, I painted it with
flat black paint. Works like a charm and don't see any reason why this
couldn't be done in a BJ8 engine bay with some minor tweaking of positions of
the fan.
First temporary installation, wired in place. Blows air right on front
float bowl.
Switch on shelf to turn on and off when needed.
In a message dated 9/4/2017 10:09:46 A.M. Pacific Daylight Time,
roggrace at telus.net writes:
My BJ8 seems to perform better with the increased O2 of lower
ambient temps in the evenings and mornings. There even seem to be fewer
rattles squeaks and groans too !
I have an oil cooler, electric rad. fan oil temp gauge and standard rad.
Whenever I spend more than say 20 mins in traffic after the engine oil is
already up to temp, the idling is impacted due to what must be due to
increased engine compartment air temp, and the HD8 mixture becoming too
rich for that
ambient.
So I decided to do some crude testing, and installed a temp. pick up near
the rear carb intake.
In an ambient of around 85F and sustained cruising at around 60 MPH ? elec.
rad fan off
Water is 190F
Oil is 165- 170F
Engine compartment is around 130F
At same ambient and elec. fan now on and after 25 mins idling in traffic
Water is 200F
Oil is 180 F
Engine compartment is over 155F and idling has to be nursed to avoid
stalling. This must be a build up of exhaust heat with no exit path.
Have tried to compromise with mixture settings but not yet found a sweet
spot.
So l was wondering if anyone has tried to improve engine compartment
venting
and how ?
Assume this why some cars have louvers on hood or side of car.
Ideas comments welcome.
On a similar thread has anyone used the cold vent air to bring cooler air
to
the carb intake area when cruising ? Results ?
rg
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