Keith,
I finally got to really read this, all this techy stuff is quite interesting,
too.
We're getting an MSD adjustable boost master (retard!)
for the '33 Ply w/354 Hemi & 6-71 Blower. Seems like we like
our Ross pistons, too!
Are you going to try & make WOS, also? Our fireman friend, Jim,
will be running a Kawi 12, should prove interesting! His nick
name used to be "Button" cause of the nitrous in his '55 Chev w/
Pontiac 455 Super Duty. Now it's Diamond Jim what with that
costly Kaw.
Kris Wright
Keith Turk wrote:
> Just a follow up on some Basic Don'ts of Nitrous Pistons... On the Motor
> Tear down I found Two Major Problems... First Tom... your exactly right... I
> burned a Piston rather then Fracturing it.... I did in fact Fracture several
> other Pistons ( based on stress cracks in the Top of the piston catching my
> fingernail ) but the basic cause was the Piston Thickness under the Exhaust
> Valve pocket... Dave gave me a neat way to check them.... but after reading
> the Spec sheet from Ross... I already understand that we took off .060 for
> Valve clearence and we started with .116 under the exhaust valve.... there
> by leaving us Just a Tick Less then the .125 minimum for Nitrous... OKAY
> ALOT LESS.... .056? so it's my idea at this point that we were about to
> smoke this hole in the Piston anyway due to the Lean condition of the Motor
> Prior to the N2O hit and finally got the Piston to blow through when I hit
> the button... No the Retard issue isn't going to let me off scott free.... I
> still messed up and very probably caused this thing to fail absolutely....
> rather then just burning the hole in the Piston... Who knows.... it's all a
> guess.... I am just sharing what I learned... and Trust me I am sharing it
> with my motor builder... he has a couple of lessons in this .... but I still
> have Blind faith in his ability over mine.... Next Year I am going to build
> my own motors... This year I still need to count on someone else...
>
> Fun stuff.... Keith
>
> Dave's Idea to check the Piston dome's thickness is to set a small rod with
> a pointy end in a vise and then set a Magnetic stand up with a dial
> indicator on top of it.... set to Zero....then fish the Piston in between
> the two and measure any point on the dome.... See Dave you can't trust me
> with anything you don't say not to Tell....
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