8 replies to this topic

[AAGR]

I hope this isn't raking over often-discussed history ....

I have just been reading a fascinating technical analysis of the 1953 JAP 4-cylinder F3 engine - water-cooled and of 497cc - in The Motor of 16 December 1953. This incudes a superb cutaway drawing by Cresswell.

Whatever happened to this engine ? Did it ever race ? Are any surviving units still in existence ?

AAGR

[werks prototype]

I hope this isn't raking over often-discussed history ....

I have just been reading a fascinating technical analysis of the 1953 JAP 4-cylinder F3 engine - water-cooled and of 497cc - in The Motor of 16 December 1953. This incudes a superb cutaway drawing by Cresswell.

Whatever happened to this engine ? Did it ever race ? Are any surviving units still in existence ?

AAGR

Marwyn ran a 497-c.c. J.A.P engine. But I can't confirm whether it is the exact engine type that you are referring to. It's possibly a start though.

[David McKinney]

All JAP 500 engines were 497cc, WP

The question is about the four-cylinder version, not the usual singles

[werks prototype]

All JAP 500 engines were 497cc, WP

The question is about the four-cylinder version, not the usual singles

Apologies. (I realised just how daft my reply was shortly after posting )

[Tim Murray]

The Motor article may be seen here:

http://velobanjogent...gs-and-odd.html

[Tim Murray]

There's an Autosport article by John Bolster, mainly about the engine, on the 500 Owners Association site:

http://www.500race.org

(click on 'Marques', then 'JAP')

The engine also appears to have been shown on the Arnolt stand at the 1954 New York Show:

http://classiccarcat...RNOLT 1954.html

[rbm]

I have never come across the JAP 4 cylinder 500cc in the results, this has been discussed 'round the camp fire' so to speak at 500 events, the general opinion is that like the Turner 4 cylinder 500cc, it would have been to heavy for the power it output and as such would not have been able to compete with the Norton double knocker manx.

does anyone know what happen to the JAP?

[eldougo]

This is what i love about TNF you never stop learning a 4cyl JAP amazing.It must be lying around in someone shed Ooooo what a barn find that would be.

[Charlieman]

Tne Motor article may be seen here:

http://velobanjogent...gs-and-odd.html

It just looks so big. How would you sort out the transmission on a bike or F3?