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Old 4 Weeks Ago   #31
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Re: Faulty Fan/Impotent Impeller

Quote Originally Posted by fiat500 View Post
?????!!!!!!
I assumed you were X with a member over something
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Old 4 Weeks Ago   #32
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Re: Faulty Fan/Impotent Impeller

Faulty keyboard and brain. I was going to say that in my humble experience, admittedly with a feeble 652 engine and the sub-zero temperatures of Scotland, it is possible to overcool the engine. That would primarily be by omitting the thermostat. I think people don't always realise that the engine doesn't just get up to to working temperature and stay there. As Tom observes, it can drop as the terrain or ground speed changes. You actually want the engine pretty hot, so a good stat will maintain that and avoid overcooling. I don't see why that won't also apply to tuned engines.
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I assumed you were X with a member over something
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Old 3 Weeks Ago   #33
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Re: Faulty Fan/Impotent Impeller

I've removed the securing-nut for the impeller again...it was really secure because I originally used threadlock and it fought me to the end . It turned out that I do have a rubber washer fitted and in theory, everything should be fine. But I find that I can rotate the fan on the shaft by about 5 degrees when loose. There should be no significant movement as it sits on a boss which is tailored to fit the central hole. So this means that either the centre of the fan or the boss or both are worn.

Next step; order a new one....
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Old 3 Weeks Ago   #34
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Re: Faulty Fan/Impotent Impeller

What fan you going for Peter! Original or the Alu unit ?

R
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Old 3 Weeks Ago   #35
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Re: Faulty Fan/Impotent Impeller

Quote Originally Posted by lazylobster View Post
What fan you going for Peter! Original or the Alu unit ?

R
Don't tell anyone, (especially @Bigvtwin996) , but I have chosen the aluminium version.

The primary reason is that it seems to have a more substantial central fitting area whch will avoid this problem in future; but I am also told that I will have the benefit of increased air-flow and consequently better cooling and, presumably, heating.

I've done quite a few miles with the worn impeller and it had already done an unknown number of miles on another engine. It will be interesting to find out how it compares with regards to noise, balance and the actual cooling function.

***THIS IS NOT A MODIFICATION*** ..(just a service upgrade).
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Old 3 Weeks Ago   #36
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Re: Faulty Fan/Impotent Impeller

I won’t tell a soul

Will you be able to do a before and after airflow measurement?

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Old 3 Weeks Ago   #37
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Re: Faulty Fan/Impotent Impeller

Quote Originally Posted by fiat500 View Post
***THIS IS NOT A MODIFICATION*** ..(just a service upgrade).
Doesn’t this apply to anything and everything?

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Old 3 Weeks Ago   #38
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Re: Faulty Fan/Impotent Impeller

Quote Originally Posted by lazylobster View Post

Will you be able to do a before and after airflow measurement?
Good question. I haven't seen any stats on this but only anecdotal evidence. I will give some thought as to how I could give a scientific report on airflow improvement.
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Old 3 Weeks Ago   #39
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Re: Faulty Fan/Impotent Impeller

Only way I know is via a cfm meter. Seen on amazoooon for less than 20 notes.
R
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Old 3 Weeks Ago   #40
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Re: Faulty Fan/Impotent Impeller

Quote Originally Posted by lazylobster View Post
Only way I know is via a cfm meter. Seen on amazoooon for less than 20 notes.
R

I was think more along the lines of an A4 sheet of paper flapping in the wind.......
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