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michael harrison 106/08/2022 12:41:36
2 forum posts

Hi new member here from Leeds.

Just having a look around.

Started my engineering career in 1970 and now just retired.

Chris Evans 606/08/2022 17:01:09
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2067 forum posts

Welcome along Michael, what sort of thing interests you ? Pre-war motorcycles for me but I do like to see some of the models. Some very skilled people on here.

Harry Wilkes06/08/2022 18:06:03
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1371 forum posts
66 photos

Welcome to the forum

H

Howard Lewis07/08/2022 11:03:30
6314 forum posts
15 photos

Welcome to the Forum.

Are you a member of a local M E Club?

If not, find one and join. There you will find like mined people, and a mass of experience, and advice, should you need it.

Also "Junk" sales are often a good source of material, measuring equipment (if you are careful ) and things "That will come in handy one day".

As an instance, I found a metric plunger clock which seemed too good to pass up, and was eventually built into a Jacques Maurel Bandsaw Blade Tension Meter. It was a good move, greatly improved the saw's behaviour, and blade life.

Howard

noel shelley07/08/2022 11:17:59
1445 forum posts
23 photos

Welcome ! There is a an ME club at Leeds and as Howard has said if you join you will find much help and advice. If you have questions then we will do our best, there are many fine engineers on here who will offer advice. Best wishes Noel.

michael harrison 107/08/2022 21:52:02
2 forum posts

Hi guys thanks for the welcome.

I have an interest in 1970s 2 stroke motorcycles.

Finding my way around the site at the moment, think I am going to enjoy the journey.

Chris Evans 608/08/2022 07:57:48
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2067 forum posts

Once again welcome, two strokes are a black art to me I just don't understand them.

Howard Lewis08/08/2022 10:57:47
6314 forum posts
15 photos

Two strokes tend to be sensitive to the induction and exhaust systems, since they rely on the pressure pulsations within the systems to provide scavenging with minimal loss of charge.

Life is simpler with diesels, since when, and how much, fuel enters the cylinder is controllable.

Often on diesels, removal of exhaust residuals is aided by a scavenge blower,although this can still make the torque band quite narrow.

The Commer TS3 and Foden FD4 and FD6 had little low speed torque, or torque back up, and needed to be kept spinning at a suitable speed. (The Foden lorry transmission used a three speed range change box as well as the normal four speed box. If you have ever driven one and encountered a rising a gradient, you will be pretty good at quick gear changes! )

General Motors perfected turbocharging two stroke diesels for their locomotives, and the engines powering ships, such as the Emma Maersk are not only prodigious in size but in output,

The single cylinder two stroke diesels in Marshall tractors were very much narrow speed band units.

Although, in Rail and Marine applications. the engines are intended as more or less as constant speed units, making tuning the systems for optimum results is easier..

A loop scavenged petrol engine in a motor cycle or car, (Wartburg for instance ) with varying speeds and loads, is quite a different proposition.

Decreasing back pressure may produce a little more power, but at a greater cost in fuel consumption, or tractability!

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