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Re: [Spridgets] Cross Flow Quesiton - Turbo Question

To: "'Kirk Hargreaves'" <khargreaves2@gmail.com>, <spridgets@autox.team.net>
Subject: Re: [Spridgets] Cross Flow Quesiton - Turbo Question
From: "Duncan Sinclair" <duncan@pondhop.com>
Date: Wed, 5 May 2010 16:38:42 -0500
Very simply:

With regular induction the air pressure in the chamber cannot be above
atmospheric in fact will be below depending on VR.
When you add a turbo the air pressure in the chamber is increased by
cramming more air in there. More air requires more fuel to maintain the best
Air Fuel ratio.
More air and more fuel = more power.
The turbo usually has a waste gate to limit the pressure in the cylinder.

When a carb is to big air velocity through the chokes will be lower so it is
more difficult to control the fuel flow.


Thanks
Duncan

-----Original Message-----
From: spridgets-bounces@autox.team.net
[mailto:spridgets-bounces@autox.team.net] On Behalf Of Kirk Hargreaves
Sent: Wednesday, May 05, 2010 14:34
To: spridgets@autox.team.net
Subject: [Spridgets] Cross Flow Quesiton - Turbo Question

eBay item.  . 230468115034

The car is pictured with two DCOE 40's. .

Seems that it would be over carbed unless he is only using the inside of
each carb in order to get a straight in flow through the manifold?

I am always curious about this over carb thing as years ago I over carbed a
small block Chevy that I built.  The engine would have run better if I had
left the Rochester single on it with the original manifold. .  but not me. .
I put a 750 double pumper on the thing not knowing at the time what the heck
I was doing.   I went back to a 650.  . which was more in line with what the
engine was able to handle.

I have yet another question.  We have a late model PT Cruiser with a turbo
(wife's car.  . I don't like the car.  . but it is her thing).

How is it that a turbo can push added air and fuel into the engine when it
comes into boost mode and not over produce too much air and fuel flow for a
small engine.  . while at the same time if one were to install a carb that
was too big, the engine performance would suffer?

Obviously there is something about how an engine accepts the added boost
from a turbo or a super charger that is different compared to installing a
carb that would be too big?

Kirk
59 1275




Kirk
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