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As some forum members may already know, I've got access to a ready supply of petrol thats been accidentally mixed with diesel. Ive used it in my allegro with a fair amount of success. The fuel causes alot of pinking and needs to be mixed 50/50 with fresh petrol for the engine to run properly. If I add castrol valvemaster plus to to mix it boosts the octane up and the engine runs perfectly. I'm guessing that the compression ratio on the allegro engine is too high for the poor quality fuel to burn properly and thats the reason behind the pinking. Its got me thinking though, which cars use engines with a very low compression ratio? I'm thinking possibly cars from the former soviet eastern block... places where only 2 star or a generally poor standard of petrol is available. Ladas Skodas e.t.c? Maybe even cars with 2 stroke engines? ...Or maybe I'm completely wrong about the low compression thing cars with such engines wont like a petrol/diesel cocktail! Have a lovely Trabbie....  |
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1987 Maestro 1.6 HL perkins diesel conversion 1986 Audi 100 Avant 1800cc on LPG 1979 Allegro Series 2 special 4 door 1500cc with vynil roof. IN BITS. HERITAGE ISSUES.  |
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You could always retard the timing, might help. Yea it'll knock performance but it'll run...
The old Range Rover spec V8s were 8.13:1, designed for two star IIRC?
If you leave the mixed fuel to stand in a drum the diesel tends to sink to the bottom as its heavier so just syphon off the top.
On the negative side, if it's a heavy mix of diesel then it can cause plug fouling and enough incompressible fluid in a cylinder to blow a head gasket on the compression stroke.
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Last Edit: Jan 4, 2009 21:44:50 GMT by Lewis
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ezzysi
Posted a lot
Posts: 1,189
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Pinto engines from transits are pretty low comp, could bang one in something cool and tax free for mega cheap retro cruising.
Or just buy an old transit!!
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1991 Mk2 Golf Gti 8v
2005 Passat tdi (daily)
1971 Mk1 Escort
2004 Touran (her's)
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Old army vehicle perhaps? If you can find something multifuel, you could increase your amount of fuel by mixing it with spendt motor oil too ;D
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Last Edit: Jan 4, 2009 21:42:37 GMT by Deleted
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I like the idea of a multifuel engine that will run on ANYTHING but they're pretty hard to get hold of and the likely size of the vehicle could make trips to tesco impractical.
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1987 Maestro 1.6 HL perkins diesel conversion 1986 Audi 100 Avant 1800cc on LPG 1979 Allegro Series 2 special 4 door 1500cc with vynil roof. IN BITS. HERITAGE ISSUES. |
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 They're pretty much all multi-fuel. Or am I just being silly? ;D EDIT: Just seen your reply. Yes I am  |
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Last Edit: Jan 4, 2009 22:00:40 GMT by Rich606
1989 Peugeot 205. You know, the one that was parked in a ditch on the campsite at RRG'17... the glass is always full. but the ratio of air to water may vary. |
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My old H van was pretty low compression I think. Certainly it was easy to turn over by hand for a 1911cc engine!
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1986 Citroen 2CV Dolly Other things. Check out my Blog for the latest! www.hubnut.org |
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They're pretty much all multi-fuel. Or am I just being silly? ;D EDIT: Just seen your reply. Yes I am Hummmm... well theres plenty of room for the shopping! Bet it doesnt need an MOT either. I remember seeing a soviet scud missile launcher on ebay. Went pretty cheap too! The seller had to remove the missile cradle thing as ebay refused to list it with the cradle still fitted... it was classed as a dangerous weapon otherwise! |
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Last Edit: Jan 4, 2009 22:06:18 GMT by Lankytim
1987 Maestro 1.6 HL perkins diesel conversion 1986 Audi 100 Avant 1800cc on LPG 1979 Allegro Series 2 special 4 door 1500cc with vynil roof. IN BITS. HERITAGE ISSUES. |
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MartinC
Part of things
Don't like stretched tyres, very low profile tyres & I think a car CAN be too low. Perhaps I'm odd.
Posts: 935
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Old Landrovers?
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1937 Standard Flying Twelve
1943 Bedford OYD
1947 Cadillac Fleetwood Sixty-Special
1954 Hillman Minx MkVIII
1956 Austin A30
1957 Vauxhall Victor Super
2001 Chrysler 300M
2002 Rover 75 Connoisseur SE Tourer
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tigran
Club Retro Rides Member
In rust we trust. Amen.
Posts: 6,444
Club RR Member Number: 142
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Along the lines of 'cars where the petrol is curse word' school of thought i'm guessing a lot of american stuff will run on pretty much anything. Aren't most small block 350's something like 9.somethinglow:1?
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1964 Rover P5 i6
1987 BMW 525e - The Rusty Streak
1992 Micra K10
2001 BMW E46 316i
2002 BMW E46 330Ci
2013 BMW F31 320d
2018 BMW G31 530d
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Seth
South East
MorrisOxford TriumphMirald HillmanMinx BorgwardIsabellaCombi
Posts: 15,516
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9.something is pretty high!
The Sun-tor had a low compression van engine - same as a 1622 Sherpa. 7.2:1 I think. It would probably have run on anything.
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Follow your dreams or you might as well be a vegetable. |
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some of the yank V8s from the early smog era are like 7.8:1
a lot of the war time and immediate post war cars were designed to run on "pool" petrol which was ungraded and cut with parafin or whatever else was handy.
Most "commerical" versions of car engines are lower compression. Bedford CF van for example runs a low compresson version of the Vauxhall slant 4 engine, HA Bedford van runs a lower compression version of the Viva engine, etc.
As well as lower performance you will typically get worse emissions and poorer fuel consumption with lower compression engines, although if you are getting the fuel cheap enough this probably won't bother you.
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1937 Austin Street Rod - 1941 Wolseley Not Rod - 1956 Humber Hawk - 1957 Daimler Conquest - 1966 Buick LeSabre - 1968 Plymouth Sport Fury - 1968 Ford Galaxie - 1969 Ford Country Squire - 1969 Mercury Marquis - 1970 Morris Minor - 1970 Buick Skylark - 1970 Ford Galaxie - 1971 Ford Galaxie - 1976 Continental Mark IV - 1976 Ford Capri - 1976 Rover V8 - 1994 Ford Fiesta
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P100 is car sized, cheap and low compression.
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Volvo back as my main squeeze, more boost and some interior goodies on the way.
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You could buy a turbocharged car and "de-turbo" it... ;D
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I remember hearing about a de-turbod volvo 740 2 litre that was pathetically slow! The turbo had gone so the guy just wanged a normal manifold on. Ive read the manual on my audi 100 and the compression ratio on the 1.8 engines is either 8-1 or 10-1. I'm unsure as to which is applicable to mine. 8-1 sounds pretty low! The fuel I'm getting hold of is free. If the guy cant give it away he has to pay someone to dispose of it, hes very happy to allow me to have as much as I want! A nice v8 yank would be great.......... the missus hates them but if they run on cack fuel then thats an excellent excuse to cruise round in one. All pie in the sky however as I'm in the process of being "credit crunched", just like everyone else.  |
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1987 Maestro 1.6 HL perkins diesel conversion 1986 Audi 100 Avant 1800cc on LPG 1979 Allegro Series 2 special 4 door 1500cc with vynil roof. IN BITS. HERITAGE ISSUES. |
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wartburg is about 7.3:1. only thing with a two stroker is what ammount of oil to put in the petrol with it having been dieselled too. mine smokes well on 40:1 regular unleaded. added diesel might get some comedy comments as well as possible tug from da law  "we stopped you because we believe your car is burning oil." "of course its burning oil- its a two stroke!" ;D |
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Don't know if bikes are your thing but this is an excuse to try one!
A lot of those flat twin BMWs can use poor grade fuel.
There's even a low grade option on the more recent ones like 1150GS or 1200GS. It's a remap or chip change I think. So you could do the Ewan and Charley thing in Mongolia or wherever.
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1976 Suzuki GT550 Celica RA28...Gone |
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in that case- sidevalve ural |
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saw one of those 6 wheel military trucks at ardingley steam rally last summer
spoke to owner from poland
looked around it
owner thought it was used as a mobile military field office
anyone know different
have photos somewhere
will try and post
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Ford sidevalves in the upright Pop, Prefect and Anglia are 6:1 compression. They will run on Tesco Value vodka, Tennents Super T etc whatever you put in it. There's also a low compression version which must be about 5:1 or 5.5:1 which was in the commercial vehicles and presumably the early Y engines. I'm guessing they were designed to run on corked wine pillaged from the French in the 1st and 2nd world wars. The later 100E sidevalves are a whopping 7:1 and require premium fuels like 2-star otherwise they pink like crazy.
Contrary to popular belief none of them need lead to run. The added weight serves no purpose other than to slow the car down.
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