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Ranger engine hotspot/Gipsy Manifold Heat

Asked elsewhere but got no response…It appears that both engines had a system on the induction manifold where some of the exhaust was routed to an area just downstream of the carb in order to heat the fuel/air mixture piot to it entering the cylinder. Most engines now have this system deactivated due to corrosion issues.

Anyone know why it was used to begin with and why it is no longer necessary?

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By: buzzbeurling - 14th March 2012 at 12:20

Thanks guys, I believe on the Gipsy Major this would have nothing to do with icing as it is downstream of the carb. Could it have something to do with vaporisation of fuel under certain conditions.

I was also told that on the Gipsy, the outer box was made thinner than the inner box so that if there is corrosion, the outer box will will rust through first, but I have not confirmed this.

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By: buzzbeurling - 14th March 2012 at 12:20

Thanks guys, I believe on the Gipsy Major this would have nothing to do with icing as it is downstream of the carb. Could it have something to do with vaporisation of fuel under certain conditions.

I was also told that on the Gipsy, the outer box was made thinner than the inner box so that if there is corrosion, the outer box will will rust through first, but I have not confirmed this.

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By: minimans - 14th March 2012 at 04:52

Heating of the air/fuel mixture is done to prevent Icing most systems now heat the incoming air with engine heat before entering the Carb. as opposed to heating the manifold under the Carb. On some engines an engine oil feed provides the heat

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By: minimans - 14th March 2012 at 04:52

Heating of the air/fuel mixture is done to prevent Icing most systems now heat the incoming air with engine heat before entering the Carb. as opposed to heating the manifold under the Carb. On some engines an engine oil feed provides the heat

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By: Proctor VH-AHY - 14th March 2012 at 03:41

G’Day

The question is easy to answer with regards to de-activation. Moisture could collect in the jacket surrounding the inlet manifold and thus corrosion in the inner wall would lead to an air leak in the inlet manifold with not-so-good results

cheers

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By: Proctor VH-AHY - 14th March 2012 at 03:41

G’Day

The question is easy to answer with regards to de-activation. Moisture could collect in the jacket surrounding the inlet manifold and thus corrosion in the inner wall would lead to an air leak in the inlet manifold with not-so-good results

cheers

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