Renault 1929 RY1 Monasix

3 minute(s) of a 217 minute read

At last the Renault engine can move forward. Having totally dismantled both the NZ and the French engines I have discovered that while the later 1929 RY1 engines had larger crankpin diameter, an increase of 4mm from 40 to 44mm, the mainbearings remained the same size. The two engines have the same cylinder bore and the same gudgeon pin size. All this means that I can use the 1929 RY1 crankshaft and conrods in the earlier 1927 RY motor and finally some real progress can happen. Provided that the cylinder bores clean up with a simple hone, I can use the same pistons albeit with new piston rings. From the 24 Valves out of the two engines I should be able to make up a useable set of 12.

5-23-2015

With the "French" motor now fully dismantled the crank shows the quality of Renault's 1920s engineering.

The fully machined and balanced the four main bearing crank has 48mm mains and 44 mm big-ends. Oiling is fully presure fed to the mains with an ingenious system of fixed collars to collect the oil emerging from the sides of the main bearings, using centrifugal force to  transfer it to the big-ends. The large "dog" at the front provides  a direct link to the Dynastart. Six 10mm bolts locate the flywheel which incorporates the aluminium cooling fan and clutch. All quite generous proportions for a 1.5 Litre engine of the period.

Bj

5-28-2015

As I commented to my wife, Helen, yesterday I really cannot take either of the two Renault engines apart any further which means that I must start to re-assemble them soon. However there has been a short interuption to work on the RY1 while I replaced a cracked Aluminium casting, part of the Lagonda Rapier's brakes. I started the Rapiers "restoration" in 1978 and still find the occassional work to do on it. Those who have not found my "thread" on the Lagonda can visit http://forums.aaca.org/topic/183184-lagonda-rapiers/page-14#entry1373936

bj

6-1-2015

You may enjoy the humour in this e-mail I have just received from the good ladies at Depanoto. 

Pour les soupapes il faudra donner les dimensions

Pensez à être toujours précis dans vos demandes

Cela évite que nous perdions notre temps et cela facilitera le traitement de vos demandes

Rien n’est standard en Renault

As Frank Sinatra would have said "The KICKER is in the last line" "Nothing is standard in a Renault"

Bj.