Graeme Posted May 21, 2004 Share Posted May 21, 2004 my 327 after a bath ( How's that...Mike kZ) Quote Link to comment Share on other sites More sharing options...
Mike kZ Posted May 21, 2004 Share Posted May 21, 2004 What kind if intake is that? Quote Link to comment Share on other sites More sharing options...
BillZ260 Posted May 21, 2004 Share Posted May 21, 2004 looks like an airgap, but I can not figure out that induction sys... ooks like that cyl is getting 2 fuel feeds and somehow injects fuel over to the funky TB. Yeah, would like to know the story on that deal... Quote Link to comment Share on other sites More sharing options...
Drax240z Posted May 21, 2004 Share Posted May 21, 2004 Propane... Quote Link to comment Share on other sites More sharing options...
BillZ260 Posted May 21, 2004 Share Posted May 21, 2004 serious? Post some info on how, what, why, all that. Cool. Quote Link to comment Share on other sites More sharing options...
RPMS Posted May 21, 2004 Share Posted May 21, 2004 No way! Spill the beans, Graeme! What you got there? Quote Link to comment Share on other sites More sharing options...
Graeme Posted May 21, 2004 Author Share Posted May 21, 2004 The system runs on propane with one converter pumping gas into a custom carby. The carby looks like a throttle body and is designed purely for gas systems. the manifold sits on top of my torker inlet and i connected the whole system up in my shed. I bought it as a kit. the single gas carby can flow up to 500 hp why , because of the emission laws down here i could not get it engineered unless it ran on unleaded with cats etc, or the alternative is to run straight gas. That meant remove the fuel tank and lines have the heads redone for gas then have it dynoed for optimum power because gas is 112 octane u can get 10% more power with this setup. Quote Link to comment Share on other sites More sharing options...
Graeme Posted May 21, 2004 Author Share Posted May 21, 2004 It also means I can connect up a supercharger to the carby, with a simple connection. I have the supercharger in mind and am hopefully going to get it in July. Quote Link to comment Share on other sites More sharing options...
MrWOT Posted May 21, 2004 Share Posted May 21, 2004 How much did the kit cost you? Just curious since propane is actually cheaper then gasoline atm Quote Link to comment Share on other sites More sharing options...
Graeme Posted May 21, 2004 Author Share Posted May 21, 2004 I got the kit through gas research in melbourne australia. For everything accept the tank it was around $1000 AUS. they also do a twin throttle body setup at around $1700. Gas here is 33 cents a litre and petrol is 1.07. much cheaper Quote Link to comment Share on other sites More sharing options...
MrWOT Posted May 21, 2004 Share Posted May 21, 2004 Curious as to a few things... 1. What kind of in tank pressures do you see on hot days? (100+) and how does the sytem cope with altitude? 2. I would imagine a backfire would be VERY undesireable so what kind of valve overlap do you run? (cam profile) 3. How does the system respond to sudden changes in vacuum? (throtle response) 4. How many km per litre? And how dependant is your mileage to altitude/temperature? Okay, that's all I can think of for now... Alright, I lied, I thought of another one 5. Do you use any kind of fuel pump? Or do you rely on tank pressure? 6. How low can you run the tank before vapor lock? 7. What kind of check valve does the system use? (to keep all the gas from escaping if the engine should be stopped during a period of valve overlap) OK! OK! I'll stop now... I promise... Quote Link to comment Share on other sites More sharing options...
Graeme Posted May 21, 2004 Author Share Posted May 21, 2004 Tank pressure I am not sure of an exact pressure. I have however suffered from too much pressure once. I was on a long trip and it was 45 degrees celcius.(thats Hot) and stopped to get gas. the pressure in the tank was greater than that in the refiller so I bought a bag of ice and sat in on the tank for 10 mins which allowed me to fill up. Cam profile, I run a competitions cam quite mild due to the supercharger going on later. part no# 12-242-2 grind no# cs xe268h-10 I have had no problems with backfire. Regularly replace plugs at 10000 km intervals. This is a must on propane i am told. The system responds extremely well to throttle response I put the car on the track for fun and give it a work out and have had no problems. The system has a safety cutout switch on it that is connected to the coil, so when ever it stops the gas is cut off. This occurs also if it stalls with the key still on. This is a legal requirement with a gas setup anyhow. Hope this helps graeme i rely on tank pressure and that is more than enough. donbt know of the altitude question i am at sea level and have not ventured high enough to comment. Mileage, I have a 65 litre gas tank and on the freeway am getting 350kms approx before i fill it up. I dont let the gauge run below 1/8 empty as a precaution. I have a remote filler pipe that allows me to use a 9 kg tank if i run out of gas. I have used it and it works only on colder days and if the tank is empty. Quote Link to comment Share on other sites More sharing options...
MrWOT Posted May 21, 2004 Share Posted May 21, 2004 Thanks! Answered enough to get me interested in looking into it more. Propane is very easy to get in CA, and many gas stations sell it, as well as hardware stores. Only concern is the altitude issue, since I drive into the mountains on a regular basis. Quote Link to comment Share on other sites More sharing options...
Graeme Posted May 21, 2004 Author Share Posted May 21, 2004 i think it would be more of a tuning issue. The guys that dyno mine have asked for certain criteria ie, power/economy type of driving and where. So as long as the tuners have a good grasp on this concept then u should have no problems. I also intent to do some mountain driving soon as I am close to the mountains as well as the sea, so I can give u some feedback if u like when i take it for another run. I am getting another dyno done as i have changed the exhaust system since, twin 2.5 ich into a 3 inch. So when i get that done i will go bush Graeme Quote Link to comment Share on other sites More sharing options...
GAZRNR Posted May 22, 2004 Share Posted May 22, 2004 A few years back I had a company car (Lumina) that was a duel fuel car meaning it ran on gas or propane. I used to run 4 tanks of propane then 1 tank gas just to keep the fuel system from drying out. The propane was higher octane but I noticed a few things. The car ran much cleaner & cooler, oil, plugs, exhaust...everything but the fuel mileage was down about 5 mpg VS gas and power was slightly down. Working for a propane company gave me easy access to propane as motor fuel but it got taxed 50 cents a gallon when used that way. The looks on peoples faces when I opened the trunk to show the tank would blow peoples minds. Thanks for the pictures! Quote Link to comment Share on other sites More sharing options...
Guest Grenade300 Posted May 24, 2004 Share Posted May 24, 2004 Somebody once told me that you can run a mix of propane and gas at the same time. This mixture acts like high octane fuel. Is this true or is the guy full of it? Quote Link to comment Share on other sites More sharing options...
Graeme Posted May 24, 2004 Author Share Posted May 24, 2004 propane and gas is not a sensible thing to do. Only one or the other. My system is propane dedicated and tuned for propane. No gas sees my engine. It funny in aus we call propane gas and petrol petrol or unleaded. U guys call petrol gas. Confusing. anyway any car that runs on both fuels will not reap the benefits og a good propane tune. Quote Link to comment Share on other sites More sharing options...
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