Recent content by deltatango

Hi Minh, I think that the excellent dynamic balance of a flat 4 engine comes from the forces due to reciprocating masses on opposite sides of the crankshaft cancelling each other out. When a piston on one side of the crank is changing direction (e.g. around the top of its stroke) there is...

Hi Minh, That firing order works fine on my Mastiff: https://www.modelenginemaker.com/index.php/topic,6419.210.html Also, I've owned three Subarus and they all fire in the same order as used by Len Mason for Mastiff. David

Hi GreenTwin, and thanks! I just looked back at my blog on the Mastiff and you're right, I didn't show the operations on the inside of the outside part of the piston. It was simply drilled and bored parallel to size. It's just a cylinder of CI. DT

Hi Minh, I built a Mastiff (finished in 2018) and wrote up the build on the Model Engine Maker forum. My description of making the pistons and cylinder liners is in Len Mason's "Mastiff" - chewed from the solid I think that Len Mason's reason for making the pistons in two parts is so that the...

OK folks, I'll give some thought to getting the drawings fit to share. It won't be this year - I'm now well into holiday mode and at the beach. David

The pictures are there now, I'm not sure why they weren't showing earlier. maybe OneDrive was being awkward. David T

Hi Robert, I wrote up a build of Mastiff on the Model Engine Maker forum: http://www.modelenginemaker.com/index.php?topic=6419.0 Most of the threads I changed to metric, along with some of the dimensions. I left the main design sizes as they were so numbers like 25.4 mm appeared a lot...