lakeracer69
Well-Known Member
Sorry, I should have said for a flywheel drive engine. I was just over there looking at those 
Building a VW Aero-Engine
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lakeracer69
Well-Known Member
Pops,
To flesh out using the gland nut and flywheel prop flange some more. The 4130 larger gland nut options seem like a no brainer.
Will either a 42 or 44mm one still work when using a GP prop hub extension? Without having one in hand it is impossible to figure out the height of the nut, or if a larger socket will fit in the counterbore of the flywheel/ dowel pin area, or not protrude and interfere with the prop extension.
Also, with an 8 pin crank it would seem like a bigger nut is better. It also looks like GP has a regular bolt of some kind for theirs. Do you know offhand the thread size for the gland nut? It measures out around 29mm or so. I have attached a picture.
Hub ID is 2.293 with a shoulder depth of .146 Flywheel center counterbore is 2.570 and .648 deep.
Thanks for helping us understand this.
To flesh out using the gland nut and flywheel prop flange some more. The 4130 larger gland nut options seem like a no brainer.
Will either a 42 or 44mm one still work when using a GP prop hub extension? Without having one in hand it is impossible to figure out the height of the nut, or if a larger socket will fit in the counterbore of the flywheel/ dowel pin area, or not protrude and interfere with the prop extension.
Also, with an 8 pin crank it would seem like a bigger nut is better. It also looks like GP has a regular bolt of some kind for theirs. Do you know offhand the thread size for the gland nut? It measures out around 29mm or so. I have attached a picture.
Hub ID is 2.293 with a shoulder depth of .146 Flywheel center counterbore is 2.570 and .648 deep.
Thanks for helping us understand this.
lakeracer69
Well-Known Member
Did my sleuthing yesterday. A 44mm socket will fit in the flywheel counterbore with a little room to spare, so the nut itself will fit fine ( diameter wise) The height of the nut is still unknown for now. I have ordered a 44mm 4130 gland nut to see if it fits under the GP prop flange. If it does, I believe that it is the way to go. Whether you use a 4 dowel crank and flywheel or an 8 dowel, the 44mm nut and washer will provide more contact area than a 36mm one.
Using one of these gland nuts to attach the flywheel flange/ prop flange to the crankshaft, is akin to the Jesus nut on a helicopter rotor hub. You'd better have faith in it. I'm ok with using the biggest/strongest one available. They also say you can torque it up to 400 ft/lbs and red loctite it on some aftermarket crankshafts.
Using one of these gland nuts to attach the flywheel flange/ prop flange to the crankshaft, is akin to the Jesus nut on a helicopter rotor hub. You'd better have faith in it. I'm ok with using the biggest/strongest one available. They also say you can torque it up to 400 ft/lbs and red loctite it on some aftermarket crankshafts.
I noted the change from 217 to 400 foot pounds. I still would like to come up with a way of locking the nut. On the shrunk fit prop hub for the pulley end of the crankshaft I used loctite on the nut and put a red paint mark on the head of the bolt and checking for movement was a normal preflight item to check. But, the shrunk fit hub is on so tight I don't think it would come off without the bolt.
