Sorry, to be clear I meant the exhaust headers, not the intake manifolds.
I've Jet-Hotted two of my 4 LBCs and the difference is very noticeable. The
BJ8 is being restored now - it is next for this treatment.
On very hot days I get vapor lock type symptoms in the BJ8 because of
boiling fuel in the carb float chambers... I know coating the headers will
get rid of this problem. I used to have hot-day boiling over issues too on
the A90 - that's completely gone now. Jet-Hotted the Jag Mk IX because it
was heating the AC lines I installed... now that's no longer a problem
either!
My cars are very sensitive to this stuff - Hong Kong is HOT and humid in the
summer.
Alan
'52 A90
'53 BN1
'64 BJ8
On Tue, Jan 13, 2009 at 11:55 AM, richard mayor <mayorrichard@hotmail.com>wrote:
> Jet Hot what? Are you talking about headers? Or, stock cast-iron exhaust
> manifolds? The stock set-up has an aluminum intake manifold directly bolted
> up to the VERY HOT iron exhaust manifold. What were they thinking? Did they
> forget that the exhaust heat will go directly from the aluminum intake
> manifold right into the aluminum carburetor? Why is anyone surprised
> that fuel boiling over in the back carb, or, any carb for that matter, was
> not anticipated? Aluminum transfers heat faster than stink. My suggestion
> is (1) modify the connection between the cast-iron exhaust manifold and the
> aluminum intake manifold (because no one drives their Healey in the middle
> of winter and needs that extra heat), or (2) replace the exhaust manifold
> with a set of tubular headers. Then, in either case, ceramic coat (Jet Hot
> is a brand name) the exhaust manifold / or / header because it will retain
> more heat within and reduce the under carb/bonnet temperature. Cooler
> carbs/fuel make more power and eliminate many unnecessary problems.
> Richard Mayor
>
>
> > Date: Tue, 13 Jan 2009 10:39:06 +0800
> > From: healey.nut@gmail.com
> > To: peter.svilans@rogers.com
> > CC: healeys@autox.team.net; linsley46@gmail.com
> > Subject: Re: [Healeys] BN 7 MkII heat shield
> >
> > If you jet hot the headers, it will help immeasurably with boiling over
> on
> > the carbs.
> >
> > Alan
> <http://windowslive.com/explore?ocid=TXT_TAGLM_WL_t1_allup_explore_012009>
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