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Hello Chris, Jason B is quite right regarding CR. With low speed model engines the effective CR is usually a lot less than the calculated CR because of the closure point of the inlet valve. Shellite has a few of the components of pump fuel(up to 30% n hexane) but minus the toxic...

Hello Chris, I routinely use Shellite. Cheers, Kerry from OZ

Hi All, In my previous post I suggested that the tool might be glass drilling bits. In fact I know that they are glass drilling bits as I have personally used this sort of tool. If you look at the smaller ends you will see the remains of some some silver solder( or brazing) that held the...

I think that they are glass cutting tip for an ultrasonic drill. Cheers, Kerry from OZ

A really nice looking engine. I find that the hardest part is the presentation and you have spent a great deal of time presenting yours. I have just joined a mens shed to try and do some nice woodwork for my tiny putt putt. Cheers, Kerry from Oz

The desmodronic valve operation as used by Ducatti is an interesting device. No springs. Cheers, Kerry from Oz

Hi All, I am building my putt put at the moment. I have trawled through all the posts (and there are a lot). I have incorporated the ball bearing crank, bushed both ends of the conrod with bronze and used bronze inserts for the valve seats and guides.I have also incorporated the hit and miss...

There is a classic book that is really worth a read called 'Tuning for Speed' by our very famous Ozzie Phill Irving. First Published in 1948 and now in its 6th edition ISBN 0 908031 29 7. Do not be put off by the word speed in the title as Phill clearly shows how different parameter changes...

I support Swifty with this. I have used brake hones with success and if you get the right one it comes with some finer grit stones for the final finish. One technique that I have recently used on a small bore is a split wooden lap that uses a wedge to spread it. You use valve grinding paste and...

I have frequently extended drill and cutters using ordinary straight mild steel shafting. A hole is drilled that hold the drill snugly and for a reasonable depth. A small flat is then ground on the side of the tool or cutter and then the drill is simply glued in using an epoxy resin such as...

In OZ the standard flux used to be called Bakers soldering flux and it was great on tinware, galvanised sheet and brass and copper. I can be made by taking some hydrochloric acid(swimming pool) and throwing in a handfull of galvanised nails. You end up with a zinc chloride solution. Use plenty...

Hi All, I actually finished my Farm Boy on the 21st of August (a momentous occasion) but it has taken me a little time to do some videos which I hope I am able to upload when I have finished this. I have some photos of the work in progress as well -they do not need any explanation. I must say...

Hi All, I actually finished my Farm Boy on the 21st of August (a momentous occasion) but it has taken me a little time to do some videos which I hope I am able to upload when I have finished this. I have some photos of the work in progress as well -they do not need any explanation. I must say...

Metric conversion with some slightly off topic. Hi fellow modelers, I have just had a look at my letter of introduction to this group and I see that I wrote it in 09-10-2012. I have now finished my model and I am quite pleased with it. Building it has been a steep learning curve for me but it...

Coleman fuel is also expensive in Australia. I have just finished a "farmboy" hitt and miss. I started out with Shellite (it stunk and the engine got dirty inside quickly) Subsequently I have tried Menanol and Acetone. Acetone is the best of the lot. Almost no noticeable smell and easy...

If you are subscribed for a new season of paper the digital edition comes with it all the way back to edition 1. Kerry from OZ

Most of the British bike clutches that I saw were made of cork in the truncated wedge form, but they ran in an oil bath which also splash lubricated the primary drive train. Cheers, Kerry from Oz

Hi fellow modelers. I don't have the luxury of either a Mitutoyo or Starret angle ruler combination so I purchased this one.It can be used for setting angles from different reference planes or points and marking out. I have produced some images to demonstrate. Cheers, Kerry from Oz PS I hope...

Hi , I bought one of these too. I find it most useful round my Seig X3. I am curious as to the fixes that you did. Cheers, Kerry from Oz

Hello Fingers, Your fan is the first one that I have seen of this legendary design.Are there any plans available that you do not have to buy a complete book to get ? If they are available I would appreciate a pointer. The carbon fibre looks terrific! Cheers, Kerry