Quote:
Originally Posted by carbuff
Greg,
In theory I completely agree with you. But I think there may be some factors at play here that muddy that theory a bit.
When I pulled the throttle body to change the plenum, the edges of the gaskets which are exposed to the plenum were damp. The plenum itself was also damp. I can't completely explain it, but one theory is that the fuel injectors are spraying on the back of the closed valve during at least a portion of the spray (depending on the particular duty cycle). That fuel hits the valve and generally atomizes. But I think that also may allow some of the vapor back into the plenum when other cylinder intake valves are open.
I've been reading threads as I can find them about one of the Holley HP EFI options which allows you to adjust the timing point when the injectors is turned off. There are theories about when to do this for either best emissions or best performance. We actually played with it a little on the dyno to see it is made any HP differences, and in reality, it didn't seem to. So I want to try and time it to finish right before the valve is opening to allow the vapor to be pulled into the cylinder right after being sprayed. My thinking being that it would reduce the ability for it to get back into the intake.
Anyway, that's a long winded reply to say that in theory, I agree with you. But I did see some 'wet' in my plenum, so I will pull it back down and keep an eye on it to make sure I don't have any problems........
On a different topic, what's up with all of the toys being up for sale? Just noticed that in the sig...
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I hate cars and am getting completely out of them.
LOL
You'd have to read the last few posts in my '40 Ford projects thread.
This "thread" might help shed some light on fuel injector and valve timing:
http://www.motec.com/forum/viewtopic.php?f=39&t=769