Re: Stinky 63 340hp
Duke;
My crankcase explosion occurred during a start-up after a lengthy storage of the car when I got back in-country. It was below zero in January and the car was stored in a garage with the cylinders packed with Wynn's Friction Proofing and valves collapsed (was popular method back then). We had set the valves, removed the plugs and turned it over to pump the cylinders out, changed the oil, new points/condensor & plugs - but we never touched the PCV valve. Therein lay the problem. It apparantly was stuck open and during the long crank to start, fuel vapors were allowed to circulate back through the system from the air cleaner to the crankcase. When the engine fired, so did the fuel vapors in the crankcase - off came the valve covers and the choke tubes, hitting the low ceiling and bouncing around. It was a sight to behold. We just laughed, what else could we do. It is the story I like to tell people at shows to explain my replacement valve covers (with the parting lines through the "O").
I thought my experience was unique until I noticed the "Advance Information" Technical Service Bulletin A.I. 63-10 re-printed in the latest J.G. P.216. It describes exactly how it happened to me, and shows a "Flame Arrestor Screen Installation" (which I still won't do as I don't want any potential loose parts in my air cleaner - thank you).
My theory was bolstered by the fact that later designs moved the clean air inlet to a separate "hog hair type" filter/tube "outside" the main air filter element, probably to limit the potential for drawing in fuel vapors.
My current shut down procedure includes removal of the air cleaner (that chrome heat reflector) and blowing an 18" fan over the engine. I also like the "screw-in/out" fuel petcock idea for in my fuel hose between the fuel filter and the carb - as long as I have a hose there now.
I tested the fuel pressure output of my pump, and it's a shade under 6 psi. The data I have on Viton tipped needle/seats used in AFB's shows them good to 6.5 psi. The Tomco valves claim up to 8 psi.
Thanks as always for your valuable assistance. I would join the chorus of the current thread thanking you, but it is getting a little mushy and I'd sooner stay at a level of Professional Respect.
Have a great day.
Stu Fox
Duke;
My crankcase explosion occurred during a start-up after a lengthy storage of the car when I got back in-country. It was below zero in January and the car was stored in a garage with the cylinders packed with Wynn's Friction Proofing and valves collapsed (was popular method back then). We had set the valves, removed the plugs and turned it over to pump the cylinders out, changed the oil, new points/condensor & plugs - but we never touched the PCV valve. Therein lay the problem. It apparantly was stuck open and during the long crank to start, fuel vapors were allowed to circulate back through the system from the air cleaner to the crankcase. When the engine fired, so did the fuel vapors in the crankcase - off came the valve covers and the choke tubes, hitting the low ceiling and bouncing around. It was a sight to behold. We just laughed, what else could we do. It is the story I like to tell people at shows to explain my replacement valve covers (with the parting lines through the "O").
I thought my experience was unique until I noticed the "Advance Information" Technical Service Bulletin A.I. 63-10 re-printed in the latest J.G. P.216. It describes exactly how it happened to me, and shows a "Flame Arrestor Screen Installation" (which I still won't do as I don't want any potential loose parts in my air cleaner - thank you).
My theory was bolstered by the fact that later designs moved the clean air inlet to a separate "hog hair type" filter/tube "outside" the main air filter element, probably to limit the potential for drawing in fuel vapors.
My current shut down procedure includes removal of the air cleaner (that chrome heat reflector) and blowing an 18" fan over the engine. I also like the "screw-in/out" fuel petcock idea for in my fuel hose between the fuel filter and the carb - as long as I have a hose there now.
I tested the fuel pressure output of my pump, and it's a shade under 6 psi. The data I have on Viton tipped needle/seats used in AFB's shows them good to 6.5 psi. The Tomco valves claim up to 8 psi.
Thanks as always for your valuable assistance. I would join the chorus of the current thread thanking you, but it is getting a little mushy and I'd sooner stay at a level of Professional Respect.
Have a great day.
Stu Fox
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