turbo's and lpg

[lyonsy]

hey
just woundering with turbo's and lpg can you run draw through with out needing the compressor wheel to be sealed off?
or is it easyer to run blow through.
also i can get hold of a turbo off a 4.2 desielnissan patrol whould this be all right for say 5000rpm on a 250?
if not what cars/trucks come with a T4 with a v1 cold wheel
just thinking of doing a low buck turbo on my carty since iam going straght gas.
drift

 

[Anonymous]

ANY TIME you place a throttle plate of any type (carb, TB, etc) in front of the the turbo inlet, you must have the correct compressor seal, or manifold vacuum will suck all the oil past the seal.

Most diesel turbos don't use the correct seal.

The TO4B turbos that I know of that are V1 trim came on DT466 (466 cu. in.) International Harvester diesels.

When looking at turbos from diesel engines, you need a turbo from an engine ~quite~ a bit larger than the gas engine it is going on.

 

[lyonsy]

hey
thanks for the info.
yeah i figured due to the low rpm nature of desiel turbo's.
i might see how much a cat c7 truck turbo will cost me (work for cat) as 6.5L thats spins to 3000rpm vs 4.1L that goes to 5500.
do you know how the lpg works with chargerd engines?

 

[Anonymous]

I've wondered this also- Propane with a Turbo. I wouldn't do a draw through though. Having a flammable gas mixture in your inlet piping, turbo and intercooler could be disastrous.

 

[Bort62]

LPG is higher octane than gasoline, but slightly lower energy density.

Injecting LPG to cool and richen the mixture on a blown engine is, IMO, a very good idea.

I will probably do it on mine, but one thing at a time.

 

[Anonymous]

Propane has seen a VERY popular increase of use when injected with nitrous in "wet" kits.

EFI intake manifolds (unlike Carb manifolds) are designed to only move air, not liquid, so the mixture distribution of any liquid through the manifold is usually pretty poor. A lot of guys use a single Fogger nozzle near the throttle body, which sprays liquid fuel and nitrous together, and the results vary with different EFI manifolds.

Propane, however, having both a very high octane, and the ability to flow with the airflow, has proven to be a very good fuel to use instead of liquid fuel being sprayed with nitrous.

Back in the 70's, Ak Miller enterprises used to sell a lot of turbo/propane kits. They make a great match.

 

[Anonymous]

How do you regulate the LPG at the nozzles? A T off the main regulator?
...or do you plumb it straight from the tank to the solenoid thru an orifice? There has to be a way to adjust A/F ratio when on "NOS".

 

[Bort62]

I would use an orifice with a solenoid. Easy enough to do.

I would probably setup a pressure activated switch to pull the propane on once boost reached a certain level.

I got into a big discussion about this on here not too long ago

 

[aussie7mains]

Just a few facts here.
Diesels dont have a throttle so there is NEVER a vacuum in the manifold, so they dont need vacuum seals on the compressor.
Dont try comparing diesel turbos to petrol, diesels have whats called excess air, which means they shift a lot more air for the given power or torque.
LPG, propane to the yanks, is made to a US spec called HD5 which allows quite a wide range of mixtures of propare and butane, which changes the gases heating value and octane this isnt generally a problem for cars.
There is a huge temperature change when changing state and pressures of LPG which requires that the gas convertors be heated by engine coolant.
There are LPG injection systems alrady on the market, but none inject as a liquid, so far its been very difficult to get that working properly. Check out Landi renzo and OMVL systems.
However LPG with turbo will work very well and is widly used industrially, most keep CR down to around 9:1 and lowish boost, The company i work for does CNG with turbo intercooler and electronic gas injection, this is applied to heavy trucks and buses.
A7M