[Diy_efi] RE: Timing and dyno pulls

[Joshua Wingell]

On Thu, 19 Dec 2002 13:12:38 -0500
  Dave Dahlgren <ddahlgren at snet.net> wrote:
>There is also no rule I have ever 
>heard about keeping heat
>out of the cylinder heads. It is a heat engine. more heat 
>more power. If you
>keep the heads cool you lose power warming them up. Make 
>a pull at 130 degree
>water temp and one at 190... 

To support this...

In May of this year, I blew my headgasket at the track 
(forgot to install the head location dowels when I 
installed the head!) on my 97 Eclipse GSX.

I didn't notice it right away, though.  I made another 
pass.

I think the head was partially or completely devoid of 
coolant.  The extra heat in the combustion chamber caused 
the car to run like a raped ape. It was pulling harder 
than I've ever felt it pull before, and with fuel settings 
about 7% richer than they ought to be. 90.5 in the 1/8th! 
Doh! 12.52 at 112mph with a lousy 1.88 60-ft.

I noticed that my radiator hose was empty just before the 
next pass.  I mentioned that I thought I blew my 
headgasket to a friend.  He asked, "What did you run?" 
 "12.52 at 112mph"  "Riiight, sure sounds 'blown' to me."

Well, it was.  I put in some more coolant and I ran 
anyway. But it felt strange. So I let off. I ran a 
12.6 at 110.8mph letting off in 3rd and 4th gear.  Blew my 
dipstick out.  Upper radiator hose was dry again.

These runs were on VP C16 117 octane leaded fuel, btw.

If only I could replicate that power without the 
inevitable melty-ness that would accompany the extra heat. 
 

Josh

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