installing lpg injectors on intake manifold

**bee utey** · 7th June 2013, 09:00 AM

Originally Posted by uzz32soarer

Thanks Ron.

Going to be quite difficult I think. Here's a picture of the gas rail that is in my kit.

One at the front and one at the back perhaps, or one on top of or below the throttle body.

**uzz32soarer** · 7th June 2013, 09:17 AM

Thanks for the help guys.

I see two ways to accomplish this job, neither is great. To maintain a tidy engine bay with at least some degree of symmetry I have two mounting options.

The simple way with the most room to play is to mount both rail to the upper manifold on the drivers side of the engine.

An alternative, which will be a struggle with the alternator but may be possible, is to mount both rails vertically at the front of the manifold as shown below.

If I mount together on one side, I estimate the longest run would be 380mm.

If I mount together at the front, the longest run is 360mm.

So negligible difference and either way, longer that the 300mm often deemed to be the maximum distance allowed?

**uzz32soarer** · 7th June 2013, 09:20 AM

Given that everything is computer controlled, I'm sure I can control it to the point that I can split the rails. ie: take number three and four around to the other side of the engine, and use one and two to feed the opposite side. This would allow me the best balance of hose lengths and keep basically every hose to around 360 - 380mm

**bee utey** · 7th June 2013, 09:31 AM

Originally Posted by uzz32soarer

Given that everything is computer controlled, I'm sure I can control it to the point that I can split the rails. ie: take number three and four around to the other side of the engine, and use one and two to feed the opposite side. This would allow me the best balance of hose lengths and keep basically every hose to around 360 - 380mm

The lengh of the hoses is not critical in that a longer lose just needs tuning for more injection time, but unequal length hoses are much more difficult to adjust for. The software won't allow you to adjust individual injectors. Much better have one rail feed the front 4 cylinders and one the back 4. Drill the nozzles into the runners from the gaps between the pairs of cylinders so the hoses end up at similar lengths. I'm quite sure there's enough room to do that.

**uzz32soarer** · 7th June 2013, 09:41 AM

Originally Posted by bee utey

One at the front and one at the back perhaps, or one on top of or below the throttle body.

I scrounged one picture off the web that I think Deacon did. It has one set on top of the intake and looks seriously ordinary. I couldn't live with that.

**p38arover** · 7th June 2013, 11:16 AM

I haven't had a chance to take some pics today but here are some I took some years ago.

Front view injector block 1

Rear view injector block 1

Front view injector block 2

Rear view injector block 2

LPG ECU

**uzz32soarer** · 7th June 2013, 11:20 AM

Originally Posted by bee utey

One at the front and one at the back perhaps, or one on top of or below the throttle body.

Good thinking, I reckon this will work. I looked at the complete engine in the car and certainly one gas rail will fit attached to the upper manifold across the back and the other across the front with the primary gas feed line running down the clear drivers side.

As you say, feed the rear four cylinders and then the front four cylinders off a rail fixed across the front of the upper manifold.

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