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- Nov 1, 2012
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I am fitting a 215 HP Lycoming Thunderbolt YIO-390-EXP119 engine to my Skybolt. Steen Aerolab seem to be unsure if they can supply an engine mount and cannot give me details of the firewall they offer (which also seems very expensive at & $750).
First prize for me would be if there were someone in the USA who would build a mount for me and someone who could build the exhaust system and make sure it didn't clash with the mount.
Failing this, my plan was to order the RV-8 Firewall forward kit from Van's for the YIO-390. This would come with the exhaust system (Vetterman, I believe). I would then order a Dynafocal 1 ring from Spruce, suspend the engine and build the mount to suit.
I attach details of engine mount on Steen drawing No 12 and a sketch I did to show set-up of engine mount relative to engine and firewall. Now, here comes my second question and I think I saw this discussed in another thread but cannot recall a definite conclusion: Why is there a forward "kink" in the lower support legs of the mount? Surely this weakens the system and also does not improve clearance between the mount and the sump of the engine?
My final question is, can someone help me with a sketch and details of the construction of the firewall: grade of stainless steel, thickness of stainless steel, edge treatment, aluminium framing member.
As always, my thanks to all the knowledgeable people on the forum who have been so generous with their assistance.
First prize for me would be if there were someone in the USA who would build a mount for me and someone who could build the exhaust system and make sure it didn't clash with the mount.
Failing this, my plan was to order the RV-8 Firewall forward kit from Van's for the YIO-390. This would come with the exhaust system (Vetterman, I believe). I would then order a Dynafocal 1 ring from Spruce, suspend the engine and build the mount to suit.
I attach details of engine mount on Steen drawing No 12 and a sketch I did to show set-up of engine mount relative to engine and firewall. Now, here comes my second question and I think I saw this discussed in another thread but cannot recall a definite conclusion: Why is there a forward "kink" in the lower support legs of the mount? Surely this weakens the system and also does not improve clearance between the mount and the sump of the engine?
My final question is, can someone help me with a sketch and details of the construction of the firewall: grade of stainless steel, thickness of stainless steel, edge treatment, aluminium framing member.
As always, my thanks to all the knowledgeable people on the forum who have been so generous with their assistance.
