[DeTomaso] efi horse power gain

[Mike Trusty]

Ok, that’s it.  I can't set here and read this BS anymore.

Jack, what the @#$% are you talking about.

I've been reading everyone's comments and opinions about efi systems and have been enjoying them.  I love to see people learning and talking about new things as a group.

Just to make sure no one gets too confused.

Jack is talking about stuff that happens above the throttle plate of a carburetor and what it does to distributor vacuum timing.  Although I disagree with much of it, his comments have NOTHING to do with efi.

The rest of you are making very good comments and discussions and I hope you continue.  Just don't get confused when someone tries to compare apples to hand grenades and spin it as the gospel.

I'm back in off forum mode.

Mike Trusty Engineering
15119 Gorgeous View Trail
Little Rock, AR  72210
Ph:  501-224-9013
Fax: 501-421-0151

---------- Forwarded message ----------
From: Kirby Schrader <kirby.schrader at gmail.com>
Date: Tue, Aug 11, 2009 at 3:42 PM
Subject: Re: [DeTomaso] efi horse power gain
To: JDeRyke at aol.com
Cc: detomaso at realbig.com


Well, what can I say...

It works to combine them. I can _prove_ it by measuring the manifold
pressure at the plenum on my car.

Why are companies like TWM using this technique if it doesn't/shouldn't work?

Either the explanation is wrong or the conclusion is wrong. Or both.

Let's not ignore the proven facts. If I did that in my job, I'd have
been fired decades ago.

Kirby

On Tue, Aug 11, 2009 at 2:59 PM, <JDeRyke at aol.com> wrote:
> In a message dated 8/11/09 8:02:16 AM, kirby.schrader at gmail.com writes:
>
> I have no idea how each cylinder's vacuum pulse can cancel out each other.
> That
> means one pulse would be negative (vacuum) and the other positive
> (pressure).....
>
> Correct- the strong pulses going back & forth thru an IR manifold are indeed
> positive and negative, as the pressure wave oscillates between the intake
> valve and the ram-tube top. As one intake opens and starts a negative wave
> downward, the preceding cylinder has just closed and starts a positive wave
> back out. I found the net from combining cylinders is zero. It's so
> prevalent that experts suggest using a fairly long piece of rubber tubing to
> connect a single intake port to a vacuum advance, so the rubber's normal
> pliability will dampen the pulses. Using metal lines is the worst- as I
> found. My vacuum with Webers wouldn't accumulate until I added a check valve
> like is in the power brake booster. But maybe the rules change with EFI-
> dunno; haven't tried it yet. FWIW- J Deryke