Recent content by Bretoal

Here is the Gnome-Rhône 14 M lubricating diagram Regards Alain

I am away from home for three days, but... wilco ! Regards Alain

Thanks for these very interesting pictures... I am sorry but I see (on right cylinder bank, back to front) : - One free outer exhaust port = one MISSING outer exhaust pipe - Five outer exhaust pipes - One inner exhaust manifold with one exhaust pipe bent over (partially sourrounding...

Hello It seems that the latest debates create confusion between different questions. To clarify things: 1) 87 octane fuel and 100 have the same energetic power. But 100 octane fuel allows a higher compression ratio and this is the only reason for the increased thermodynamic efficiency...

No blooper (I think...), just an error in the drawing... Roller T is in contact ONLY with exhaust camplate, roller V only with inlet camplate...

Here is an interior drawing for th Bloch 200 Propellers were... Gnome-Rhône propellers, 3 blades fixed pitch. Color was natural (aluminium). Regards Alain

I think the blueish tone is essentially due to bad lighting and bad color balance when shooting. The second one is OK (picture is mine !) and FS 36440 should be convenient. Note that cylinders and cylinders heads are matt black, rocker tubes and rocker covers are glossy - and induction pipes...

Hello GR 14K and 14N are externally similar. Have a look at : Gnome et Rhône 14N - Wikipédia (in french) (don’t trust the blueish color of the first picture, look at the 14N49) or Gnome et Rhône 14M - Wikipédia (in french) I think I have inner drawings for the Bloch MB 200, I...

Yes, JerryW, there are seven exhaust ports and just lower you see obviously more than THREE inlet tubes. The first one (black), as far as I can see, has no carburettor... This engine is a VK-107 and caption is faulty. And the "o" or "d" structure is unknown for me, sorry... But... Happy new...

Here is a VK-107 upper view. You see clearly the two inner exhaust manifolds, with fore left and right outlets. The upper outlet only blows fresh air in order to cool manifolds... Regards Alain

Yellow circle... The VK-107 (and predecessors) use a typical Hispano Suiza feature (Patent FR691852, 1930). The main bearing supports of the crankshaft are double-walled and between an air flow is provided, in order to cool the main bearings. The air inlet is in the fore left of the engine...

And, just for the fun - but maybe an answer to the question = "single or twin camshafts for the VK-107?" - here is the camshafts/valve arrangement for the VK-105 with three valves (two intake, one exhaust) So, there is a special feature with a "T" part for twin valves.... with drastic...

Yes, but in the US version for his patent, Louis Birkigt shows a barometric system to control fresh air throttle... I don't know if all these systems were effectively tested on early version fo the 12 Z (1938-1939). Development was halted by French collapse, and some work was made in Spain...

JerryW, Thanks for your comments. Gunston is right. On each cylinder bank, the inner exhaust ports were connected throught a common manifold blowing outside via a 180° outlet. Here is a VK-107 Yak 3, you see 7 (yes, seven...) exhaust ports, the first one (bigger) corresponds...

I bet you will find Louis Birkigt's patents : CH210887 (in French), GB516605, CA417617, US2240088. Drawings and texts are not exactly the sames. Just before these patents (1937 -1938 ), Birkigt had worked on a 6-stroke version for Hispano V12, aiming to reduce fuel consumption. Obviously, the...