Search found 1035 matches

by C3H8
Thu Nov 14, 2019 3:32 pm
Forum: Propane Forum
Topic: Starting problem with Model 425 Mixer on a 1995 Chevy S10
Replies: 4
Views: 176

Re: Starting problem with Model 425 Mixer on a 1995 Chevy S10

The 4.3 is more then capable of generating the airflow for a 425 unless the 425 is worn internally. Hundreds of CA300/50 series mixers and 425 mixers were installed on UPS vans in Canada and worked successfully. If the only issue is starting then either an SV primer or an alternative high pressure p...
by C3H8
Thu Nov 07, 2019 4:04 am
Forum: Propane Forum
Topic: Dualcurve repair?
Replies: 1
Views: 100

Re: Dualcurve repair?

It depends on the construction. At one time the dualcurve box electronics were encased in a molded compound that made accessing the electronics impossible. Later they stopped doing this. The main issue is the reason for the failure. Did the tracer on a circuit board fail? That could be easily repair...
by C3H8
Thu Sep 12, 2019 1:55 pm
Forum: Propane Forum
Topic: Help to identify the parts in this picture.
Replies: 12
Views: 614

Re: Help to identify the parts in this picture.

Hi Storm. What an awesome car. The link was great. The underhood system is Century 100%. The carbs have the famous draglink setup common to Century carburetors for decades. Like you though I have never seen filters like this. Have you tried using the contact us box on the website. I noticed the site...
by C3H8
Sun Jul 21, 2019 1:39 am
Forum: Propane Forum
Topic: Impco accel Hesitation, poor idle when warm VY Commodore
Replies: 9
Views: 433

Re: Impco accel Hesitation, poor idle when warm VY Commodore

I'm pretty sure your referring to a check valve IMPCO designed back in the 90's. The tiny airbleed orifice in the fuel control fitting is too small to allow rapid movement of the secondary diaphragm and this caused a hesitation. IMPCO made a spring loaded check valve to allow control under most circ...
by C3H8
Wed Apr 10, 2019 1:49 pm
Forum: Propane Forum
Topic: Adding an elec. fuelpump to an Impco vaporizer+425 setup
Replies: 39
Views: 1968

Re: Adding an elec. fuelpump to an Impco vaporizer+425 setup

Sorry guys. That was me that mentioned Bennet early on in this post. The guy I was referring to was Dave Bennet. He lived in Minnesota in the USA. Dave developed a system in the mid 90's on Fords where he used the OEM ECU. He installed a special tank from sleegers with an electric pump to maintain a...
by C3H8
Fri Mar 22, 2019 5:14 pm
Forum: Propane Forum
Topic: Musings on Dual Fuel Implementation
Replies: 3
Views: 240

Re: Musings on Dual Fuel Implementation

Forgot. Another EGR benefit. It allowed an increase in timing at cruise because of the lower combustion chamber pressures.
by C3H8
Fri Mar 22, 2019 5:12 pm
Forum: Propane Forum
Topic: Musings on Dual Fuel Implementation
Replies: 3
Views: 240

Re: Musings on Dual Fuel Implementation

That's quite a project with many upsides. The only comment I can add would be its too bad you eliminated the EGR. EGR's are one of the true better emission devices manufacturers installed that did everything intended. A properly functioning EGR improves economy during cruise and lowers combustion te...
by C3H8
Fri Mar 22, 2019 5:01 pm
Forum: Propane Forum
Topic: What does the RCV valve do ?
Replies: 3
Views: 241

Re: What does the RCV valve do ?

Add to that. It is only used with fuel control systems that use vacuum to control the secondary diaphragm. The standard orifice bleed hole in the fuel control fitting was not large enough to allow rapid response of the secondary diaphragm. The regulator control valve would open if the throttle was f...
by C3H8
Thu Mar 21, 2019 2:43 am
Forum: Propane Forum
Topic: Additional mixture base leaning
Replies: 7
Views: 473

Re: Additional mixture base leaning

There is still something that does not make sense here. From the day they were first produced 200 and 225 series mixers have been notorious for being lean at idle. Also as you state the mixer is on the large size for your engine. I that case it should even be leaner since the air flow would be reduc...
by C3H8
Mon Mar 11, 2019 1:26 pm
Forum: Propane Forum
Topic: Bought my first propane van
Replies: 9
Views: 459

Re: Bought my first propane van

Whoops? A bit of a problem here. An Autotronics 8789 is made for GM vehicles not Dodge. Are you sure you got the number right. Depending on what they intended on the installation I guess you could adapt it to work on your vehicle as an O2 fix. That would be the only function the 8789 could be used f...
by C3H8
Sun Mar 10, 2019 3:33 am
Forum: Propane Forum
Topic: Bought my first propane van
Replies: 9
Views: 459

Re: Bought my first propane van

I'm going to assume you have the 5.9L engine in that van. Let's face it, you just described it as a raised roof and weighing in at 7000 lbs. Realistically you aren't going to get great mileage from that vehicle no matter the fuel. The same set up in a 1/2 or 3/4 ton truck weighing 5500 lbs could onl...
by C3H8
Sun Feb 24, 2019 2:51 am
Forum: Propane Forum
Topic: Additional mixture base leaning
Replies: 7
Views: 473

Re: Additional mixture base leaning

You can use leaning rings to lower the valve. They go between the gas valve and the diaphragm lowering the gas valve into the bore. They are approximately .003" thick and several can be used if required. The IMPCO part # is R1-30. They come in brass or plastic.
by C3H8
Thu Feb 21, 2019 1:21 pm
Forum: Propane Forum
Topic: Modern setup vs. ancient factory propane specs on tractor
Replies: 16
Views: 845

Re: Modern setup vs. ancient factory propane specs on tractor

All to do with the basic operation of an IMPCO mixer. At no load the airflow through the mixer is very slow and the gas valve barely open. Lowering the idle speed reduces the air flow and the gas valve virtually closes. With the load the air flow is higher and the air/gas valve is pulled open a lot ...
by C3H8
Tue Feb 19, 2019 1:35 pm
Forum: Propane Forum
Topic: Modern setup vs. ancient factory propane specs on tractor
Replies: 16
Views: 845

Re: Modern setup vs. ancient factory propane specs on tractor

Fuel efficiency on gasoline in older vehicles could be very erratic. They typically had very rich mixtures to keep them running cold using a choke. This was because of really poor atomization of the gasoline and much of the liquid droplets would get stuck on the intake manifold walls until the engin...
by C3H8
Sat Feb 02, 2019 1:46 pm
Forum: Propane Forum
Topic: Vaporizer temperature, contaminants, and separate thermostats
Replies: 6
Views: 364

Re: Vaporizer temperature, contaminants, and separate thermostats

All propane is contaminated to a small amount with heavy ends. Take the specification for automotive propane in Canada. It specifies HD5 as 90% propane, 5% Butane, and 5% of other products. The last 5% are typically the items referred to as heavy ends. They are the small amounts of oil and contamina...