Back in the mid '90s, early adopters experimented with heat wrap and
claimed reduced noise and marginal performance improvements
(subjective). This was followed by a rash of exhaust pipe fractures that
were attributed to the heat wrap and everybody dropped it like a, well,
hot exhaust.
It was subsequently discovered that the first batch of (classic)
exhausts had been made out of mild steel and not the stainless steel
specified, so it is possible that this could have been a contributing
factor.
I have a motorcycle fitted with a titanium exhaust. It is so thin that
at night I can see the road ahead by the cosy red glow. This system is
incredibly light and ridiculously resilient and I wonder if it would be
a suitable material for a bespoke Europa system - combined with heat wrap?
Nigel
On 11/05/2011 08:42, Brian Davies wrote:
>
> I have been following this thread and waiting to see if exhaust
> wrapping will be mentioned as a solution to high under-cowl
> temperatures. The wrapping of exhaust systems has always been frowned
> upon in the certified world, supposedly because it causes cracking and
> corrosion of the system. Modern exhaust wrap is highly effective and
> I am not aware of any negative effects. It is also approved by the
> LAA on a number of Rotax installations.
>
> My experience with it is on a closely cowled racing engine where the
> heat reduction is quite dramatic.
>
> Any comments?
>
> Regards
>
> Brian Davies
>
> *From:*owner-europa-list-server@matronics.com
> [mailto:owner-europa-list-server@matronics.com] *On Behalf Of *Sidsel
> & Svein Johnsen
> *Sent:* 10 May 2011 21:39
> *To:* europa-list@matronics.com
> *Subject:* Europa-List: Carb, fuel and oil tube heat shielding
>
> Ref. recent discussion regarding risk of fuel vapor lock and how to
> shield the fuel system from engine heat.
>
> Attached is photo and sketch of the carb heat shields I made out of
> s/s steel plate. Fixed to the exhaust pipes by s/s hose clamps. The
> clamps expand and contract in approximate sync with the exhaust pipes,
> so no cracking discovered and no re-tightening required. As will be
> seen, the carbs have heating blocks installed, which (as stated by
> Graham) makes the factory heat shields difficult to use.
>
> All fuel hoses forward of firewall are protected by both fire sleeve
> and heat sleeve (claimed to reflect approx. 90% of radiated heat) --
> see photo. Both purchased from racing car supply shop in the UK
> (don't recall name, and I am away from my file). I also use the heat
> sleeve on oil lines running very close to the engine.
>
> /////
>
> Regarding the fuel return restrictor: I use the restrictor supplied
> by the factory in 2001. Do not know the hole diameter, but it is less
> than 0.5 mm. The opening is indeed surprisingly small, but bear in
> mind that gasoline has very low viscosity compared to e.g. water.
>
> (I sent an earlier message today with same heading, but it appears it
> did not go through. If it does pop up, pls disregard it)
>
> Regards
>
> Svein
>
> LN-SKJ
>
> *
>
>
> *
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