Carb Conversion "Kits" ETA March-April 2016

[Lou and "Boo"]

Although my whole explanation of how my carb issue was remedied was deleted, I do apologize for letting things get out of hand. In summary, you need a power valve installed or the car will fall on its face at takeoff(with Peugeot manifold)

So if we can get back on topic here....Wondering what kind of issue was noticed that the loose injector boots caused.

[content22207_2]

claims it would be more fire resistant than kjet

Whether or not they are more fire resistant, two facts about carbureted fuel lines are indisputable:
1) Carbureted fuel lines run at very low pressure (4-6 PSI). K-Jet fuel lines run at very high pressure (75 PSI). Hence leaks in carbureted fuel lines spray less fuel/less far than leaks in K-Jet fuel lines.
2) Even in carbureted systems with check valves (ie: electric pumps I provide have check valves), rest pressure is minimal -- a leak will dissipate rest pressure much more quickly after de-energizing the pump than K-Jet. Note that if the needle valve is open at the time pump is de-energized there won't be any rest pressure.

I happen to like carburetion's lower line pressures for a variety of reasons, including wear & tear, but other owners may not.

Note that the above applies to DeLoreans only. In other carbureted applications, such as push lawn mowers, line pressure is usually provided by gravity alone (virtually no PSI).

Bill Robertson
#5939

[Soundkillr]

And I offer this even more simple fact, a fuel leak is a fuel leak. No matter the pressure, it is not a good thing, and can result in anything burning to the ground. Engineers design cars so they don't have fuel leaks. Age or improper installation can do ANYTHING.
It's obvious you like carburetors, and it's great that it works for you. Again, all comes down to preference. Leave it at that.

Whether or not they are more fire resistant, two facts about carbureted fuel lines are indisputable:
1) Carbureted fuel lines run at very low pressure (4-6 PSI). K-Jet fuel lines run at very high pressure (75 PSI). Hence leaks in carbureted fuel lines spray less fuel/less far than leaks in K-Jet fuel lines.
2) Even in carbureted systems with check valves (ie: electric pumps I provide have check valves), rest pressure is minimal -- a leak will dissipate rest pressure much more quickly after de-energizing the pump than K-Jet. Note that if the needle valve is open at the time pump is de-energized there won't be any rest pressure.

I happen to like carburetion's lower line pressures for a variety of reasons, including wear & tear, but other owners may not.

Note that the above applies to DeLoreans only. In other carbureted applications, such as push lawn mowers, line pressure is usually provided by gravity alone (virtually no PSI).

Bill Robertson
#5939

[content22207_2]

In my case it's more than preference -- my heads have no injector bungs, so I couldn't run multiport injection even if I wanted to.

I could run TBI, but IMHO there's no real difference between a throttle body injector and a carburetor (for example, the recent dustup over fuel falling out of suspension applies equally to TBI and carburetion).

Bill Robertson
#5939

[Lou and "Boo"]

Seems my carb explanation (power valve) is back up or wasn't taken down in the first place. Thank you again!

[The Aviator]

Although my whole explanation of how my carb issue was remedied was deleted, I do apologize for letting things get out of hand. In summary, you need a power valve installed or the car will fall on its face at takeoff(with Peugeot manifold)

So if we can get back on topic here....Wondering what kind of issue was noticed that the loose injector boots caused.

that's the only thing I don't care for too much with the carb conversion. if I am going to have another motor to rebuild and keep my stock one stock, I don't see the harm in tapping the injector ports and plugging them with a threaded plug. IF there is enough meat in the ports to do so

i was also wondering if I could machine a plug and press the plug into the port...


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[Lou and "Boo"]

Bill's bolt shaft plugs are just like a machined plug you may "make ". They would both need the rubber boots to make a vacuum seal though. I think Bill's plugs are good, I may just need to replace the injector boots and clips IF there's a vac leak there.

But I don't THINK I have any engine issues that would suggest a vac leak. What specifically would I look for?

[Rich_NYS]

I want to know what a power valve is...

[Drive Stainless]

I want to know what a power valve is...

From: http://street2mud.com/webfiles/MC-21...%20a%20258.pdf

Power Enrichment System
During heavy load conditions or
high speed operation, the fuel-air ratio
must be increased for higher engine
output. The power enrichment system
supplies extra fuel during this period
and is controlled by intake manifold
vacuum (Fig. 7).
Manifold vacuum is applied to the
power valve diaphragm from an opening
in the base of the main body,
through a passage in the main body
and power valve chamber to the power
valve diaphragm. During idle and
normal driving conditions, manifold
vacuum is high enough to overcome the
power valve spring tension and hold
the valve closed. When higher engine
output is required, the increased load
on the engine results in decreased
manifold vacuum. The power valve
spring opens the power valve when
manifold vacuum drops below a predetermined
value. Fuel flows from the
fuel bowl through the power valve and
into passages leading to the main
wells. At the main wells, this fuel is
added to the fuel in the main metering
system to enrichen the mixture.
As engine load requirements decrease,
manifold vacuum increases and
overcomes the tension of the power
valve spring, closing the power valve.

[Lou and "Boo"]

Power valve is what Bill calls a full throttle enrichment valve. Basically it screws in under the fuel bowl and when a certain vac pressure is exerted by the metered air flow through the the ventures, it opens to supply more fuel.

It is a stock part of the carb. But can be plugged if someone is having rich/flooding issues.

My car with the Peugeot manifold fell on its face and had no acceleration (had to lightly feather the gas pedal to accellerate and not buck) with that valve removed and plugged. With the power valve in place and operational, my car just looks like a shiny silver blur flying past you in the left lane (or even the right if I feel daring enough).