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AJAX Barrels

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AJAX Barrels

Post  MoscowFlyer on Wed May 23, 2012 10:19 pm

Hi, here is an ad from a 1957 mag, it shows that back in those days they were putting the 225cc pistons into the 197cc engines. AJAX offered alloy barrels for the 6E, 8E and 9E, with standard or HC, you could have 59mm or 63mm, which gave you, in their words, Super Proformance. Also there was soon to become available, light alloy barrels for the 250cc Villiers twin. Mike

Last edited by RussianFlyer on Fri May 25, 2012 8:40 am; edited 3 times in total


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Twin Alloy Barrels

Post  tbird on Thu May 24, 2012 9:20 am

Do you know if they ever did the Alloy barrels for the Villiers Twin.???

Graham (tbird)


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Alloy Barrel

Post  MoscowFlyer on Thu May 24, 2012 9:34 am

Hi, I don't know if they ever made any, the only alloy barrels I've seen are the ones Nametab Engineering make. Mike


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ajax pistons

Post  piston 197 on Thu May 24, 2012 11:36 am

Mike strangely enough the Ajax firm cast their own pistons,with a raised centre section whic started about 3/8" in from the sides and was about 1/8" high,the bores were as the villiers for the 197 and 225cc (59mm and 63mm) so you could use a villiers piston although it would not work as well as the ajax one as the internal dome of the head was smaller to take advantage of the squish afforded by the raised portion of the piston.
Oddly enough the bore of the ajax 250cc piston was 65.5mm,whereas the villiers 250cc was 66mm,again it could be bored to accept the villiers item.
The only other alloy barrel i know of for the 6/8E was the Darrieulat barrel which was a superb one with hard chrome bore and a 3 bolt flanged exhaust port,this was designed and made by Frank Darrieulat the works Bsa sidecar trials ace,who also competed on a DOT outfit in club trials fitted with one of his own barrels
Obviously there were many for the 9E/32A engines including Marcelle,Parkinson,Greeves,Dot, DMW, REH, to name a few as well as the offerings from BKR,Upton etc in the go-kart world

piston 197

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