I guess the "suck it and see " aproach will tell. (no pun intended)

the question about if a turbo will provide enough heat.

sorry...!

and the heater core idea is 'interesting'. i mean, it work with heater fan speeds, but i'm wondering if it will work at 0.5bar of pressure with 350odd cfm.

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Not quite, this is a water to air exchanger mounted directly over the manifold. Gravity will pull anything into the manifold. There will be no more charge present than would normally lie in the manifold in a N/A application.

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Yes to which question?
The original one, or the revised one?


No I wouldn't try to boost through a heater core. the water goes through that. The boost passes over the finn, losing its heat.

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You can do a blow through very easily, the converter doesn't actually need a 'vacuum' signal to allow gas to be fed to the mixer, all it needs is a pressure variance between what it senses as being atmospheric pressure and that of the signal from the mixer.

With this in mind all you need to do is put a fitting in the atmospheric vent on the converter and run a hose from that fitting to somewhere between the turbo and mixer.

In all essence it is the same as running almost any carby on a blow through system.

The point you make of the gas not forming droplets in the intercooler is a good one, however what happens when you switch the engine off? There will still be quite a lot of mixture left in the intercooler, nice bomb...

OIC.

i didn't know the mixer needed a vacuum signal - something else i've learned today
so effectively a "gas carby" is exactly that - a fuel metering device that delivers fuel on a required basis according to engine vacuum...?

i always thought it was a nickname

does the mixer send the fuel down the "vacuum signal" line...? or is it a seperate line you can hook up to before the turbo, and the mixer can deliver the fuel after the turbo?

and the heater core - you're not planning on putting boost thru the ACTUAL heater core - are you? or was that just an example? coz a heater core will have about as much flow potential as a dry sponge.

and i see your idea about the "hopper" setup there. effectively the fuel runs through the core in a downward motion eliminating "pooling" and running lean.

i think if you ran this line thru the W2A core, THEN the turbo and back to the convertor i think that might produce enough heat to counteract the freezing effects of the compressed gas.

might, because i have no experince with gas convertors - as i'm sure you're aware by now.

i can say that water cooled turbo cores do use the water a lot more than the oil to remove heat. if the oil in oil-cooled cores gets hot enough to ruin said core on a hot shutdown, then there has to be a lot of heat removed by the water to allow the oil to purely lubricate.

so i would say "yes" to your question.

You couldn't do a blowthrough with out using injection. The mixer wont deliver any gas with out a vacuum signal. The mixer is flanged onto a carb. (In this case I would use an old SU, but use it as a throttle body only) this delivers gas (and air) into the intake. Theres nowhere to blow into.

What I would do is enclose a four inch cubic water filled core, (like a heater core) inside a sealed hopper type thing. This would sit directley on top of the stock intake manifold.
Picture a typical blowthrough set up, and picture the charge feed into the manifold going into the top of the inter cooler hopper. (imagine the core is in a box with a funnel each end) the water is circulated through the core. Instead of having a seperate exchanger front mounted, (more weight etc) using an electric pump to circulate water from the converter, thriugh the core.

As mentioned previously, butane boils at 0C, and propane boils at -40C. there is no way the charge will be cooled below 0C once the turbo has compressed it. Hence, the droplets cant fall out of the charge. (unlike with petrol. that being said, some supercharged V8 race motors, espeically ones in boats) do use a water fed chiller between the blower and the intake)

Having given my original guestion a bit more thought, I now realise what I really should have asked was " How much will a turbo heat air at cruise throttle?"

A turbo might well be able to keep the converter from freezing just from the heat transfer from the charge ON BOOST. But at cruise throttle, converter freezing might occour.

I spose that I will have to build a set up, and them experiment with the intercooler part after that.

Bart.

how would you do a W2A on a drawthru setup? wouldn't the liquified gas just pool in the cooling core?

you could do it on a blowthru setup with no worries.

the W2A cooler would be enough of a heatsink to stop the water freezing for sure.

and to be honest, i think you've come up with a great idea :thumbsup:

The evaporation of of the gas can actually generate enough cold to freeze the converter solid. On a frosty winters morning, before the engine is warmed up, (And when there is no antifreeze in the water) Ive seen cars that wont go till a bucket of hot water is splashed over the converter.

I am toying with the idea of a drawthrough turbo on lpg. I have most of the parts lying around already.
An idea I was contemplating, is to use the cold water from the converter (in a seperate circuit from the engine cooling system, with an electric pump) to feed a water to air intercooler. the problem is keeping the water from freezing, while having a heat souce that wont put too much heat into the cuircuit.
That was why I wondered how much heat a turbo produced.
The two seperate components of lpg boil at 0C, and -40C. If it was possible to utilise this cold to cool down the charge, massive gains in charge density could be acheived.

Plus, since it is a gas at room temp, there would be no worries about droplets falling out of the charge.

The only reason a gas convertor will freeze is due to lack of water running through it.
Water in the convertor can be at 1 degree,because gas is below freezing gas it wont ice up.
As dattodude said run the water for the convertor through the heater hoses i dont think you will have a problem. & make sure the convertor is lower than the top tank of the radiator as an air lock will cause freezing as well. Also volume of water matters to so it must have good flow so take it from the water pump & some convertors have 1 direction circulation aswell so if you stuff that up it will freeze if it has that there will be a arrow or will say in & out on the or near the water outlets. So after all that i dont think a turbo will give enough water volume to stop the convertor from freezing