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Hydrocarbon cracking System
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tlk70 Offline
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Post: #2351
RE: Hydrocarbon cracking System
Hello Amigos,

Four years ago, I inquired about implementing HCS on my '74 (page 144) VW Super Beetle. I was not able to work on it with HCS, since I had not repaired the engine. A few months ago I was finally able to get it fixed and now I'm driving it.

Can someone point me in the right direction? I've attached an image of my engine. I don't think I have a PCV Valve. I have a breather pipe, so should I hook up to that pipe going up to the air intake?

Thanks for your help


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(This post was last modified: 05-08-2017 02:28 PM by tlk70.)
05-08-2017 08:23 AM
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think411 Offline
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Post: #2352
RE: Hydrocarbon cracking System
I was waiting for someone more knowledgeable to reply to your post but since this thread has been quiet lately, the usual people dont check in as much. So I will attempt help here.
My guess would be that you should find somewhere where the exhaust can be channeled to use to pump pressure to your HCS system that coincides with your engines revs. For many this is the PVC but some may not have that luxury so you will have to find where another channel of air flow can be used to push exhaust thru the HCS unit.
Since yours is pre OBD computer, you dont have an EGR to tap in to either.
Not knowing the workings of a carbureted vehicle, I cant really give you any more help.
Is there any other device connected to your exhaust manifold or way to tap into your exhaust gasses?
05-11-2017 09:32 PM
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hhofox Offline
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Post: #2353
RE: Hydrocarbon cracking System
Hello tlk70!
Simply use the vacuum tube on the carb to get HCS vapors into your engine along with the revs! It should be un the neck of the carb, below where the pan and filter sits.
You should have great results if you do it right. I did when I had a computer free vehicle. I even ran on the vapor suppliment for a few miles before it ran out.
What I did was to change the air to fuel ratio with the adjusting knob, AFTER attaching HCS. It started rich (lots of gas), but I simply adjusted it, aiming for a smooth idle, with the gas bubbling. After that, I just kept gas in the bubbler. When the gas ran out, the car could not keep up without my stepping on the gas.
Man! Those were the days. Too bad I could not keep that car, since it needed engine work done.
Let us know how it turns out, okay? Also, start out simple, and keep detailed logs of what you do.
05-16-2017 06:49 PM
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dingo Offline
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Post: #2354
RE: Hydrocarbon cracking System
In my experience with the air cooled Bug engine, i could not get sufficient pressure out of the breather pipe. I used vacuum from the one of the carb orifices..but i found that the small engine lagged, especially under load i.e. when you need it most, you dont get it....like going up hill, or accelerating. If you can find a way to make it work, id be glad to hear about it..it iS worth experimenting with.
Recently i found a cheap electric air pump with the idea of using that instead...however this one was not built to run for more than 20 minutes..gets too hot. It does produce way more pressure than you need for the bubbler, despite only rated at 1.25Amps. So maybe a smaller, and higher quality variation would work. Anyways thats where i am at right now.
(This post was last modified: 05-29-2017 12:24 PM by dingo.)
05-29-2017 12:23 PM
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fueller Offline
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Post: #2355
RE: Hydrocarbon cracking System
(05-29-2017 12:23 PM)dingo Wrote:  Recently i found a cheap electric air pump with the idea of using that instead...however this one was not built to run for more than 20 minutes..gets too hot. It does produce way more pressure than you need for the bubbler, despite only rated at 1.25Amps. So maybe a smaller, and higher quality variation would work. Anyways thats where i am at right now.
And tell me how do you intend to regulate the amount of air needed? When you push the gas : amount of air pumped by the airpump would be definitely not sufficient. When you iddle or just gently push gas pedal, the air amount (HCS aerosol) would be definitely too much.....
07-21-2017 12:35 PM
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dingo Offline
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Post: #2356
RE: Hydrocarbon cracking System
And tell me how do you intend to regulate the amount of air needed? When you push the gas : amount of air pumped by the airpump would be definitely not sufficient. When you iddle or just gently push gas pedal, the air amount (HCS aerosol) would be definitely too much.....


[/quote]

I dont know !..trying to keep things as simple and uncluttered as possible.
Have not solved this issue...yet !
07-22-2017 09:34 AM
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fueller Offline
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Post: #2357
RE: Hydrocarbon cracking System
(07-22-2017 09:34 AM)dingo Wrote:  I dont know !..trying to keep things as simple and uncluttered as possible.
Have not solved this issue...yet !
Well you must implement some kind of power-regulation-control-system.
Either you take some signal from gas-pedal-sensor or turbo-pressure-sensor or consumption sensor or air-mass-sesnor and based on that you increase or decrease the power to your air-pump.. And this is probably a contradiction to your desire "to keep things as simple and uncluttered as possible".
The only way so far, which I found out (as described before I had several cars where there was no overpressure from HCV or similiar available and the negative pressure not powerfull enough: Take overpressure from the exhaust pipe somewhere after the CAT by reversed VENTURI tube. The only disadvantage is: you must open your exhaust pipe for this....and than be carefull with the hose mounted from the exhaust tube to the bubbler due to:
1. mechanical load by vibrations and movements from the exhaust tube, which can tear your hose attached to the exhaust tube
2. lot of heat which can burn the attached hose...

I know what I am talking about, since I had to deal with this issue allready several times....Wink
08-02-2017 12:00 PM
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dingo Offline
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Post: #2358
RE: Hydrocarbon cracking System
Thanks for the ideas....can you explain in more detail about the ' reversed VENTURI tube.'....is this mounted at 90 deg to the pipe or parrallel tot he flow ?
08-03-2017 10:07 AM
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fueller Offline
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Post: #2359
RE: Hydrocarbon cracking System
(08-03-2017 10:07 AM)dingo Wrote:  Thanks for the ideas....can you explain in more detail about the ' reversed VENTURI tube.'....is this mounted at 90 deg to the pipe or parrallel tot he flow ?
It is mounted in 90° angle to the exhaust pipe, but the "wide sidelong opening" is not in direction of the flow but in the opposite direction "against" the flow. Therefore it creates positive pressure in the hose connected to the "reversed venturi tube" instead of negative pressure as in "standard venturi tube"
(This post was last modified: 08-06-2017 10:09 AM by fueller.)
08-06-2017 10:08 AM
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dingo Offline
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Post: #2360
RE: Hydrocarbon cracking System
Thank You. That makes sense.
08-09-2017 09:50 AM
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