I had mine Jet-Hot coated in 1999, and also didn't see any significant effect
on the engine temps. They surely looked a lot better than the old rusty
manifolds and have held up really well over that time and about 80K miles.
Some browning is beginning to show at the sharp edges, but I think I have got
my money's worth out of Jet-Hot and if I ever have a reason to remove the
manifolds I'll probably get them coated again.
I've never wrapped the downpipes. The new radiator core and the sleeved
thermostat together have solved the engine heat problem, so I see no need to
wrap them.
Steve Byers
HBJ8L/36666
BJ8 Registry
AHCA Delegate at Large
Havelock, NC
From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Bob
Spidell
Sent: Monday, September 04, 2017 3:38 PM
To: healeys at autox.team.net
Subject: Re: [Healeys] BJ8 Temps
FWIW, I just had the manifolds on my BJ8 Jet-Hot coated and haven't noticed
much, if any, difference in running temps or other effects (I also wrapped my
downpipes). YMMV.
Bob
On 9/4/2017 10:05 AM, Al Fuller wrote:
Roger:
Have you considered coating the exhaust manifolds, so as to conduct the heat
down the exhaust system, as opposed to allowing the manifolds to be their usual
heat radiating selves?
I?m still thinking a winter project will be getting mine coated [Jet-Hot, etc.].
Al Fuller
al at bighealey dot org
'65 BJ-8
'85 Rx-7
From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Roger
Grace
Sent: Monday, September 4, 2017 10:14 AM
Subject: [Healeys] BJ8 Temps
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
_____
<http://www.avg.com/internet-security> Image removed by sender. AVG logo
This email has been checked for viruses by AVG antivirus software.
www.avg.com <http://www.avg.com/internet-security>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://autox.team.net/pipermail/healeys/attachments/20170910/0ae7d0a1/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: ~WRD348.jpg
Type: image/jpeg
Size: 823 bytes
Desc: not available
URL:
<http://autox.team.net/pipermail/healeys/attachments/20170910/0ae7d0a1/attachment.jpg>
|
