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Mike I dont know how long you've been running your foden but have you checked the chimney is clean, I was gobsmacked at how much crud my agri had around the blast pipe and it made a large difference to the draw once it was all cleaned up.
- Number of posts : 291
Location : Hampshire
Registration date : 2013-09-08
The chimney is not too bad, I just wondered if the shape of the hole made any difference to the flow of the exhaust. A straight hole would not give a particularly clean flow, whereas a venturi shape might but then how big?
I use threaded inserts on my engines, and the club engines where I've got my paws on them. Shape wise, they are tapered internally up to the hole which itself is parallel at whatever chosen size. Some people have previously advocated convergent/divergent nozzles, as in taper smaller up towards the top internally, then taper back out again, but they don't work any better and in some cases are worse. Stick with mine or just a plain parallel hole.
- Number of posts : 96
Location : Rugby
Registration date : 2012-09-27
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