924Board.org

Rich H · Posted: Mon Feb 25, 2008 6:06 pm Post subject:

I thought that the vaporiser did that before distribution to the injectors?

I don't know for sure though....
_________________
1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

Martijnus · Joined: 29 Dec 2006 Posts: 2019 Location: Netherlands

Rich H · Posted: Mon Feb 25, 2008 8:33 pm Post subject:

Never thought of that! Injector holes for Vac takeoff, its obvious now

Cheers Martijnus!

If its Liquid when you inject it then I don't see why normal injectors won't work just fine, I assume that the spray will atomise it and the hot intale tract will vaporise it, dunno about high revs though, and also you will need to sort out the change over form LPG to gas and back, could be tricky to manage or would you just have a snap change over?

R
_________________
1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

Martijnus · Joined: 29 Dec 2006 Posts: 2019 Location: Netherlands

drwal · Joined: 24 Feb 2008 Posts: 29 Location: Opole - Poland

firstly: hello becouse i am new in here and i am from poland, so sorry for my bad englihs...

secondly:

some of my friens have LPG in their p924. it works, but it albo depends of generation of the lpg system.

the most problem is too regulate it with k-jetronic. also the temperature of burning gas is higher, so it is not good for the engines head.

we can feel the loss of power on gas.

Some of them tries too install a BLOS system and it is a king of little carbourater for lpg, mountin on the pipe between k-jet and the air intake system(? i dont know the technical name of it, the aluminium which give us the balance of air

with a porsche sign

). And using a blos, the power is a little lower as on petrol.

but i dont think its is good way to lpg system in 924.
Maybe if sbd does 10k km per month

with this car

also on gas there are some gas blows that can destruct some part of the k-jet.

maybe next time i will take a dictonary and tell a little more, becouse i now a lot of that system, and if it works good, but i hevent got in my mind technical words

Martijnus · Joined: 29 Dec 2006 Posts: 2019 Location: Netherlands

thanks for sharing the information!

The K-jet is already gone in my car and also at Rich-h's car. so that's no problem anymore

Since i've raised my comperssion ratio, my engine temperature will be a little bit higher, so an oil cooler will be installed anyway.
I also want to cut the valve seats a little different to supply the valves with enough surface to cool down.

monitoring oil temperature and so on will keep everything safe.

and al the trouble you mention is the reason I don't want to use the non-liquid injection.
_________________
"Rule: Turbo's make torque, and torque makes fun." (C. Bell)

924 "50-jahre", 1981.
MSII/extra, LPG, ITB's, 5lug.
To be turbo'ed in a while.
Killed her at the Nurburgring, Porscheless at the moment

Rich H · Posted: Tue Feb 26, 2008 3:43 am Post subject:

For the MAP I was going to link all the runners with a vacuum line and take a tapping from there. TO damp it out I haev seen a small fuel filter used in line with the map sender which causes enough of a restriction to damp out the changes. Thats what I will try anyway.

I nned a vacuum line for the brake servo anyway, I could combine the 2 I suppose.
_________________
1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

cadetboy2 · Posted: Tue Feb 26, 2008 4:54 am Post subject: Porsche & LPG

Perhaps somebody should talk to this lady.

Ebay item 290207369107

Cheers Bob

Rich H · Posted: Tue Feb 26, 2008 5:04 am Post subject:

That is a big tank!

_________________
1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

drwal · Joined: 24 Feb 2008 Posts: 29 Location: Opole - Poland

lot of people mounts lpg tank as/for the emergency wheel, and the 5th wheel goes to bag.

Martijnus · Joined: 29 Dec 2006 Posts: 2019 Location: Netherlands

yeah but those space saving porsche spares caused a limited space... and for a few litres it's not worth it.
I guess 30 lit is the max.

anyway...my plans have slightly changed. I'm not converting to LPI, because it's expensive, parts are expensive too and the advantage over gas-state isn't that much imho.

So I found out you can inject it in gas-state too

Don't know yet what the injectors will cost but I'll find out soon.

It uses less lines, less parts and has less things to fail compared with LPI.

The pumps in the tank cease quite often, i've been told, and that means replacing the whole tank. $ 600

With injectors the same thing... more than 200$ a piece.

Gasstate petrol doesn't need a pump...
_________________
"Rule: Turbo's make torque, and torque makes fun." (C. Bell)

924 "50-jahre", 1981.
MSII/extra, LPG, ITB's, 5lug.
To be turbo'ed in a while.
Killed her at the Nurburgring, Porscheless at the moment

Martijnus · Joined: 29 Dec 2006 Posts: 2019 Location: Netherlands

wow...

Some shop close to my location has a set of 4 (dry gas) injectors and a evaporator... so, that's 50% of the parts that I need...the rest is small stuff like hoses, valves and lines... and a tank of course but I'll lend one from someone to pass the tests and then buy a cheap non-approved one. (to today's standards...it's not illegal)
He wants 185 eur for the 4 injectors and evaporator... that's cheap! that means I can be done for under 300 eur!

so...thát means I've got my money back after 3000km's or something like that... that's just after the break-in period

edit: the advantage is that I'll be using megasquirt, which doesn't give extra costs for a gas computer.
_________________
"Rule: Turbo's make torque, and torque makes fun." (C. Bell)

924 "50-jahre", 1981.
MSII/extra, LPG, ITB's, 5lug.
To be turbo'ed in a while.
Killed her at the Nurburgring, Porscheless at the moment

Rich H · Posted: Fri Feb 29, 2008 8:56 am Post subject:

Nice work!

_________________
1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

Nobbi · Joined: 24 Aug 2006 Posts: 1396 Location: Germany

martijnus,

sounds great, i hope it will work and i am able to take a look at your car when we meet at the `Ring`.

Nobbi

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NA 924 - april/1977- 4-speed-audi gearbox.
500.000 km with fun.....and new toy:Porsche 944 S2 Cabriolet.Other car Daimler c-class cabby,brandnew..Plus : DEUTZ 4005 tractor Built 1967