Club 80-90 Forums

kevtherev wrote: I would have thought in our climate a throttle body de-icer is irrelevant?

Probably just the opposite, Kev. Icing is most common at around 5-15°C, and high humidity. When it's colder, the air is often much drier so it's less likely that condensed water vapour will freeze in the venturi.

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OK not our climate I agree.
But it's more likely in Aircooled engines, than with water cooled, All that hot coolant flowing around the manifold its less likely imo.
I was under the impression the carb heaters turn off at 67deg.
When the temp2 sender switches off the inlet heating curcuits.

I personally don't think its an issue., on a WBX.
More than enough latent heat to stop icing.

Nice little chart here

https://www.casa.gov.au/sites/g/files/n ... _chart.pdf

I'm not convinced on Aircooled being worse on a T25.

On a CU the Solex carbs are just above the heads, with a short distance for conducted heat to raise the temperature of the carb, whereas on a WBX the single central carb is away from the heat of the head and relies on two heat transfer operations engine > coolant, coolant > carb, to warm the body of the carb.

update: I suspect that's why the electric carb heating is on the WBX engines

Yes, I agree. Probably being rear engined helps a lot. Some carb models suffer with it much more than others. The Pierburg doesn't seem prone to it on a wbx, but may be on a front engined vehicle and no manifold heating.
Barring one unhappy chap, I hear the overwhelming majority feel Brosal works very well indeed without the heater. And it's possible to drill and tap if you really wanted to add it.

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ajsimmo wrote:Yes, I agree. Probably being rear engined helps a lot. Some carb models suffer with it much more than others. The Pierburg doesn't seem prone to it on a wbx, but may be on a front engined vehicle and no manifold heating.
Barring one unhappy chap, I hear the overwhelming majority feel Brosal works very well indeed without the heater. And it's possible to drill and tap if you really wanted to add it.

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Have you fitted a Brosal Andy?

Nope, not been asked for one. There's rarely anything wrong with a Pierburg that can't be fixed.

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Update: fitted a few Brosuls now, first impression was ok, but a bit of a faff to set up properly out of the box, but worked alright. Unfortunately the longer term experience was not so good. Had a couple of failures, overfuelling and flooding, idle issues, choke failure. I sent two back for refunds, and I no longer fit them.

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