Afraid I just stayed on it to long. Had plenty of piston thickness as it
burned the week link...ring lands instead. Should have gotten out of it
sooner and turned out, but things just happen so fast it's hard to react
quick enough. You have just got to have it right in the first place...right
equipment and tuning...with nitrous or your gonna spend lots of EXTRA money
putting blown-up engines back together...if there is anything left to
reassemble.
My personal goal is to set a new E/FCC record. The 225 MPH number has been
sitting there for 10 years. It's not soft, but its doable...our 218 MPH run
through the middle mile shows that..., and I want it.
Ya know Keith, after you get that red hat there are still plenty of goals to
keep a guy coming back for a life time.
John Beckett, LSR #79, E/FCC
----- Original Message -----
From: "Keith Turk" <kturk@ala.net>
To: <land-speed@autox.team.net>
Sent: Monday, August 21, 2000 9:41 PM
Subject: Piston information
> 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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