[Diy_efi] RE: Timing and dyno pulls

[M. Claywell]

On 24 Dec 2002, Adam Wade wrote:
> --- efi student <efi.student at sbcglobal.net> wrote:
> 
> > What about the effect of a higher system pressure on
> > localized boiling and surface wetting for thermal
> > transfer?
> 
> That is a specialized example of the general rule in
> the post you're responding to.  So IOW, I already
> covered that.
> 
> > Isn't a higher cap pressure going to reduce the size
> > of the steam bubbles around the exhaust ports and
> > improve thermal transfer?
> 
> That depends on whether the system is venting 
> through the lower pressure cap or not.  As I
> mentioned, if the cap is not venting, then getting one
> with a higher venting pressure won't make a difference
> in system pressure.

Perhaps he is thinking of a pre-pressurized system like that is used in
most modern race cars. That would make a difference, but like I and Adam
have said, just putting a higher pressure cap on, if the system is not
leaking, is going to change the system pressure. It is only a safety
pressure relief valve. I would still stick with the higher pressure one if
it's working for you.

Mark






> 
> =====
> | Adam Wade                       1990 Kwak Zephyr 550 (Daphne) |
> |   http://y42.photos.yahoo.com/bc/espresso_doppio/lst?.dir=/   |
> | "It was like an emergency ward after a great catastrophe; it  |
> |   didn't matter what race or class the victims belonged to.   |
> |  They were all given the same miracle drug, which was coffee. |
> |   The catastrophe in this case, of course, was that the sun   |
> |     had come up again."                    -Kurt Vonnegut     |
> 
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