Fuel injection... on an 1850

[djw113uk]

We have two 1850's. Both are ex- auto, one with sprint diff and one still with auto diff, both with 1850 o/d gearboxes. One gets 32-35mog, the other 28 sometimes worse, under the same conditions.

On the poor MPG one we have a lambda which shows rich most of the time, except when you get to higher revs when it goes lean. if you lean off the carbs it just goes lean earlier, but is still rich under all other conditions.

I could get a carb rebuild kit from Burlen for about £80, but after putting efi on my rover 3.5 I wondered if anyone has efi'd an 1850?

I guess megajolt is the obvious solution, but what about the inlet manifold - do you drill and install injectors on whats there, or if there another easier / better solution.
I know there are a few sprint efi's about, but has anyone done an 1850?
Thanks

[Mad Mart]

Megasquirt if you're going EFi.

[cliftyhanger]

down to budget.....
A weber inlet and set of jenveys would be nice....but not exactly a budget build.

The approach often used is to make a custom inlet with a single throttle body from modern car.
Or a set of individual throttle bodies (can be sourced off a bike)

however, none of the above is exactly a cheap exercise. However expect a healthy gain in mpg and power.

Cheapest solution is the check and fix the carbs, then book into a session on a rolling road. Can make a significant difference.

[Jon Tilson]

I suspect if you show rich at lower revs you have worn jet holes.
This is quite common on SU'ed cars with the spring biased needle.

I suggest you invest in some new jets - common to Spit and dolly 1500.

Weak at the top is typical of an SU'ed 1850. BL did that on purpose hoping the road testers wouldnt notice.

Its why back in the day NBH would do 105 on bergs before I sprinted it. No SU'ed 1850 Ive ever had bar HOH was that
quick and HOH had clearly had work done.

Jeffers if you read this did you ever look at what needles are in HOH?

Jonners

[sprint95m]

but what about the inlet manifold - but has anyone done an 1850?

Fuel injected TR7s were sold in the USA.
A TR7 manifold will fit either type of 1850 head.


Jeroen has a fuel injected 1850 running on LPG but his is LHD....
the TR7 airbox won't clear the brake servo on a RHD 1850 apparently.
It may be worth a PM to him.....





Ian.

[Dolly-Nut]

but what about the inlet manifold - but has anyone done an 1850?

Fuel injected TR7s were sold in the USA.

the TR7 airbox won't clear the brake servo on a RHD 1850 apparently.
It may be worth a PM to him.....





Ian.

It also wont fit because of the bolt spacing between the HS4 & 6.

[cliftyhanger]

but what about the inlet manifold - but has anyone done an 1850?

Fuel injected TR7s were sold in the USA.

the TR7 airbox won't clear the brake servo on a RHD 1850 apparently.
It may be worth a PM to him.....





Ian.

It also wont fit because of the bolt spacing between the HS4 & 6.

Ah, but being fuel injection it wont have either carbs......

[wiggybum]

I was only on about this the other day - maybe worth a guinea pig try on this system:

viewtopic.php?f=4&t=28295


I've found that a bad dizzy/vac advance will rob a lot of economy.

[soe8m]

Koffieklets 4.jpg (133.01 KiB) Viewed 1668 times

Jeroen

[djw113uk]

Was going to ask how and where that all came from, but just found your "new project" post. Looks great...going to take me a while to create & copy all that though!

David

[soe8m]

Most of it was tr7. But a lot of bending and grinding to make it fit. I also had to make a spacer for the heaterblower as it is about 8cm further to the side. I used a tr7 ecu but it was running on petrol but not perfect. I just needed petrol injection to have my lpg injection running. It managed 13km on 1 liter lpg.

It going to on this now.

plenum5.JPG (54.38 KiB) Viewed 1663 times

viewtopic.php?f=3&t=20105

Jeroen

[jikovron]

i once had the idea of using the efi system from a similarly sized engine in a late 90s car and applying it to a classic car engine..imo the running characteristics of a slant would be very similar to a renault 1.7sohc ,a vw 1.8sohc or a ford1.6 16v
with a custom crank trigger wheel fitted to the crank pulley and the injection parts and sensors adapted to the manifold most closed loop systems would adapt to the minimal fueling change automatically and give obd diagnostics /immobiliser to boot

i have heard about a 1.1 8valve ecu to be able to adapt to running a 1.6 in a citroen saxo after a few miles of lambda feedback

HTH

[Carledo]

There is a Sprinted Toledo 2 door running around (changed hands a year or two ago) with what looked to me like XR3i injection on it.

Steve

[djw113uk]

Yes, that is "flying farmer" I have seen that car - but missed out on buying it. It is ford kit, but he is far better at adapting systems to suit - just see his stag forum threads!

[soe8m]

I can supply you a manifold. You have to make your own setup like plenum etc. There are some holes in it were the lpg injectors were in but you can put some plugs in.

Jeroen