Compression ratio q: (attn ATHOL)
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From: Dan--- on 29 Jun 2007 19:25 On Fri, 29 Jun 2007 16:44:58 +1000, John McKenzie PCM code reading says: > Dan--- wrote: > > >> Small block chev 383 running on dedicated non efi LPG. As we know that LPG >> has a decent amount of octane if I recall 100-110 rating? > > It's probably somewhere around 105 research - it's approx 5 motor octane > numbers higher than pulp (there's only listing and mandates on it's > motor octane number not it's research that I can find on govco websites) > so 105 is a guesstimate more than anything else. Thanks John for your input it helps a lot. :-) -- Regards Dan
From: Noddy on 29 Jun 2007 19:51 <OzOne> wrote in message news:oe2b83p98775erk2ctqs1f1r8kp03ud3gq(a)4ax.com... > You'd need to look at the rate that the gas is liberated at various > temps. > One tank might not evaporate enough. > This is the reason you often see multiple cylinders in domestic LPG > installs. I thought it was just for the storage capacity :) -- Regards, Noddy.
From: Jason James on 29 Jun 2007 22:34 <OzOne> wrote in message news:oe2b83p98775erk2ctqs1f1r8kp03ud3gq(a)4ax.com... > > > You'd need to look at the rate that the gas is liberated at various > temps. > One tank might not evaporate enough. > This is the reason you often see multiple cylinders in domestic LPG > installs. The dual bottle installs in town here where houses are not connected to natural-gas, have a gas-tap which selects *one* cyl or the other when the first is empty,..and these houses run gas hot-water, stove and heating, So I'm not sure what you're talking about, unless you are refering to industrial applications. The 351Ford can chew thru an 80 litre LPG cylinder in 4 hours towing a laden 4 wheel trailer,..now that's *gas-flow*. Jason
From: John McKenzie on 29 Jun 2007 23:29 Athol wrote: > > John McKenzie <jmac(a)alphalink.com.au> wrote: > > > If you have the cash, then I highly recommend looking into anything by > > AirFlow Research > > Also known as AFR. hence the capitals in the relevant places. > The earlier name for the same company was Brownfield, haven't seen any advertised for a while, but to be fair I haven't bloody looked either. > They used different casting methods and materials to anyone else years > ago but I wouldn't be surprised if they were subsequently copied... not by edelbrock :) > > Edelbrock make > > some arguably affordable cost effective heads, but imho aren't in the > > same league. If it was a streeter, or anything more serious than a 'zero > > buck, do what I can' build I'd go afr for sure. > > I'd love a set of the 4-valve (pushrod) heads, but they're a little on > the expensive side. The AFRs are one of the better alternatives. the thing soon gets to a point where even though xyz would be more efficient, there's little if any justification, as the output is beyond reasonable (by the out there standards of idiots like me) without usually having to resort to all that. > > > Another issue is the tank. most standard tank > > fittings only flow enough to support 1 impco or gra mixer (and matching > > convertor). > > I'd love to know where this claim comes from. > > I'd suggest that you ask someone like APA about the flow capacity of the > service valve and solenoid. I can't honestly say I've experienced it, what with my main stuff on lpg being under 4.4 litres (some exceptions but not many). I can't comment on the relative temperatures, though I agree with the rationale. I saw it first on ford forums (I couldn't sleep). From one guy in particular who claimed back to back dyno tests, with no other change, was responsible for a 20bhp (or something like that much) gain on a smallblock, and that that was all that would get the a/f curve to stop leaning out at the top end. The way it was presented appeared sound, but I'll sit on the fence now until I see it (or don't) myself. > Tanks used to have an "excess flow" valve that was intended to shut down > the flow if the line was broken in a crash. The introduction of tank > solenoids in 1994 meant that the excess flow valve was able to have a > much higher threshold. I'm honestly not even certain that they are > fitted at all any more. If you used an older tank and fitted an inline > solenoid to comply with the newer rules, the excess flow valve might be > a problem. maybe that's what it was - I'll have to go back and look through the archives (which thankfully isn't a mammoth task) -- John McKenzie tosspam(a)aol.com abuse(a)yahoo.com abuse(a)hotmail.com abuse(a)earthlink.com abuse(a)aol.com vice.president(a)whitehouse.gov president(a)whitehouse.gov sweep.day(a)accc.gov.au uce(a)ftc.gov admin(a)loopback abuse(a)iprimus.com.au If you didn't know it was wrong,why did you cover it up? abuse(a)msn.com $USER@$HOST $LOGNAME(a)localhost -h1024(a)localhost root(a)mailloop.com abuse(a)federalpolice.gov.au fraudinfo(a)psinet.com abuse(a)cia.gov $USER(a)localhost abuse(a)sprint.com abuse(a)fbi.gov abuse(a)asio.gov.au $LOGIN(a)localhost
From: Noddy on 30 Jun 2007 02:16
<OzOne> wrote in message news:m5ob83tad61n02vc0bf3h7tp058i4rbdsp(a)4ax.com... > DUH....I stand corrected. > I'm not aux fait with LPG systems...appears many here aren't either as > you're the first one to mention the fact. We were just waiting for you to bury yourself as usual Oz :) > Oh and the reason you see multiple cylinders on a changeover manifold > is because 0ne each side will in some cases not liberate enough gas so > Two are used each side ie 4 cylinders...sometimes more. It depends largley on what the gas is, and what it's used for. > Another reason of course is to extend the period between refills when > appliances are used over long periods. I thought I said that earlier, and you poo-pooed it :) -- Regards, Noddy. |