<VV> Fuel Leak / lug nuts

[Hugo Miller]

That all sounds a bit too devious for me. There’s nothing special about Corvair flywheel bolts – you could say the same about lots of other fasteners. My guess would be a simpler explanation – that they didn’t want to weaken the flange by drilling holes that were too large. If that is the case, they were clearly wrong, if racers can drill the holes out to 3/8” without the flange disintegrating. 
It would interesting to hear if anybody knows the ‘inside story’ on this.

From: Seth Emerson 
Sent: Thursday, October 4, 2018 6:20 PM
To: Hugo at aruncoaches.co.uk ; joel at joelsplace.com ; virtualvairs at corvair.org 
Subject: Re: <VV> Fuel Leak / lug nuts

Hugo - I cannot say, for sure, but this is my take. Those bolts are heavily loaded. If they had used 3/8"-24 NF bolts, it would have been possible to replace them with softer, grade 5 bolts during engine work, later on. Since the 11/32" was unique, only the original bolts could be used in this application, insuring that these bolts could take the loads required. That said, the holes in both the flywheel plate and the PG torque converter mounting plate are already 3/8". For many years racers have been re-drilling/tapping those six holes in the crank gear out to 3/8-24 NF. There is a special tool available to do that with regular hand tools. ARP sells a special "kit" of bolts that replace the stockers with extra-strong 3/8-24 bolts.  

-Seth Emerson



-----Original Message-----
From: Hugo Miller via VirtualVairs <virtualvairs at corvair.org>
To: Joel McGregor <joel at joelsplace.com>; virtualvairs <virtualvairs at corvair.org>
Sent: Thu, Oct 4, 2018 1:19 am
Subject: Re: <VV> Fuel Leak / lug nuts

Why would they use such an obscure bolt size? I don't think I've ever seen
an 11/32" bolt in my life. Why didn't they just use 3/8"? Is there some 
obscure engineering reason for it?
I've never dismantled a Corvair engine, but I do know that GM products
generally keep things as simple as possible. Also that's an extremely small
size, if you're talking about the bolts that hold the flywheel to the crank.



-----Original Message----- 
From: Joel McGregor via VirtualVairs
Sent: Thursday, October 4, 2018 5:00 AM
To: virtualvairs at corvair.org
Subject: Re: Fuel Leak / lug nuts

Obviously I had switched to bolt head size. 11/32 bolt size - flywheels are
the only thing I think I've ever seen use that.

-----Original Message-----
From: VirtualVairs <virtualvairs-bounces at corvair.org> On Behalf Of Joel
McGregor via VirtualVairs
Sent: Wednesday, October 03, 2018 10:33 PM
To: virtualvairs at corvair.org
Subject: Re: <VV> Fuel Leak / lug nuts

Coils and starter solenoids? I can't remember but I've used that size in
the last week for sure.

-----Original Message-----
From: Hugo Miller <Hugo at aruncoaches.co.uk>
Sent: Saturday, September 29, 2018 7:59 AM
To: Joel McGregor <joel at joelsplace.com>; virtualvairs at corvair.org
Subject: Re: <VV> Fuel Leak / lug nuts

11/32"? When did you last see one of those!

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