Quantcast

Building a VW Aero-Engine

HomeBuiltAirplanes.com

Help Support HomeBuiltAirplanes.com:

fly2kads

Well-Known Member
HBA Supporter
Joined
Jan 2, 2010
Messages
1,777
Location
Justin, TX
FWIW, the vendor Pops linked to above, aircooled.net, is one of my go-to sources for VW engine parts. John, the owner, has been at it for years, and knows his stuff. It can take a while to get answers to questions, but his advice is solid. I have never had an issue with anything I have purchased from him, and shipping is prompt. No affiliation, just a satisfied customer.
 
Last edited:

lakeracer69

Well-Known Member
Joined
Dec 10, 2008
Messages
175
Location
New Hampshire
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.

0101.jpg

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.
 

Pops

Well-Known Member
HBA Supporter
Log Member
Joined
Jan 1, 2013
Messages
8,800
Location
USA.
I don't know . Good question if you want to use the larger nut.
 

lakeracer69

Well-Known Member
Joined
Dec 10, 2008
Messages
175
Location
New Hampshire
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.
 

Pops

Well-Known Member
HBA Supporter
Log Member
Joined
Jan 1, 2013
Messages
8,800
Location
USA.
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.
 
Top