maximum and cruising rpm's

[mengels]

Hi,

Can anyone tell me what the maximum and cruising rpm's are for the 350cc NG engine?
Thanks,

Maarten

[Paul Slootheer]

According to Ariel book of Waller a NG gave, with a 6:1 compression ratio, 13 BHP (9.69kw) at 5000 peak revs. The W/NG shares the same valve timing, so I think is safe to assume it did have comparable output. However as we all know it is not wise to keep a old motorcycle stessed at peak rpm for a longer period of time. My experience is that a motorcycle itself dictate's the rpm in which it want to cruise.
Regards, Paul

[olle.blomqvist]

In Roy Bacon´s book, Ariel the postwar models in the specifications chapter it says
Cr 6,5:1 @5800rpm 17 bhp

[Paul Slootheer]

Ole, as far as I know 17 BHP is the output of a 350 ‘Red Hunter’. The Red Hunter did have a different state of tune, that is a different camshaft (22-70-70-25 degrees), larger carburettor and polished ports etc. The (W?)/NG did have the ‘softer state of tune’. That is a different camshaft timing (5-55-60-20 degrees), therefore making lower revs and lower output of just 13 BHP. I can't find specs. from the W/NG but assume they are the same as from the NG.

[Leejm]

I agree with Paul. You need a larger carb for higher rpm. The wng had a small carb. And the cam timing is next to useless. It's why the ng and wng had lower output and lower rpm. I have the same book as olle, and it does say what you said. But I will say I have noticed a few things in that book at are not correct.