Series 2.25 carbs

Hi

I think the Zenith 36IV in my IIA may be warping after only 4 months of being fitted as the engine isn't running right and the mixture screw doesn't appear to be doing anything. Before this I had a weber 34ICH fitted, which I don't want to go back to as it had less power and was crap in any weather even resembling the cold.

What other carbs can be fitted? Solex? SU HS6 maybe?

Reply to
Daniel Collins
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If you google for ACR (Automotive Component Remanufacturing) you might find what you are looking for re. SU carbs. I'm pretty sure that Roland (owner) did a lot of work with tuning of the 2.25, part of which included a bolt-on adaptor elbow for an HS6(?), if my memory serves me right..... Badger.

Reply to
Badger

"Badger" wrote

Whilst we are on about such things where the 2.25 or 2.5 petrol ever (mechanically?) fuel injected in any application?

Reply to
Bob Hobden

I've two of those elbows going spare.

Not as far as I know

Reply to
Oily

Hi..

I did see a "home brew" (very well done too) petrol injection mod years back at one of the Trentham Gardens show. I can't remember if it was a

4 or 6 pot, but it was the genuine LR engine, not a transplant.

From the little I can remember, the guy who did it, was a profesional motor vehicle engineer, with all the right tools and knowledge etc, it was not a bodge job in any way. He had manufactured his own inlet manifold, and crank angle sensor system, but otherwise had used "standard" (but not LR) parts. He was somewhat evasive about the control system used, so I'm not sure if it was electronic (ECU) or otherwise, probably something like the old Triumph system perhaps?

The result was "a lot more" power when wanted, but it had a thirst as a result, and some comment about overheating. Well, if you force feed it extra go juice, you have to expect that sort of thing.

Many other people have done "the usual boy racer" things to the venerable 2 1/4 lump (porting, polishing, whizzy manifolds etc) with predictable results. Very "peaky" power curve, but lots of it. I seem to remember at least one competitive team used such a modd'ed engine in one of the hill climb events, as it was in a lower class than the V8's, but had similar power! Not sure of the overall results, or if it completed the event. It was written up in one of the early 4x4 mags.

I've even heard of one supercharged 2 1/4 petrol, it didn't survive. That is not the same as the well documented supercharged Diesels LR themselves played with briefly.

Re the warping carbs. One of the mags a while ago had a full article as to the reasons why it happens, and how to cure it. One friend who's SIII suffered that, achieved a total fix as a result. Well worth finding that article if you can. I think I have a scanned file of it somwhere, but can't find it just now.

Regards.

Dave B.

Reply to
G8KBV

I've a feeling it might have been Roland Marlow from ACR, sounds like his kind of thing, and I know he was doing a lot of tuning development work with the 2.25, in conjunction with a bloke by the name of Ian Sykes

And you can't get power without burning fuel.

There are a few major issues though. Firstly, it ends up drinking more fuel than the V8 to make the same bhp. Secondly, it has less torque across the rev range. Thirdly, it's probably heavier - in fact, I'd put money on that!

I wonder if they used the stronger diesel crank and went for specialist forged pistons...... If so, there's no reason for it to go bang really, as the combustion pressures would still be lower than the disiesel variant.

I always put it down to cheap production methods with low quality alloys myself...... Badger.

Reply to
Badger

Indeed....

Dunno about using the Diesel crank that would make sence, and be virtualy unbustable, or what pistons were used, but they were talking about some internal "changes", it was not a just bolt it on job. ???

Agreed about the weight thing, the all alloy V8's are nice in that respect, as well as the sound they make :-)

Warping carbs, and production methods, well, probably. I seem to recall an engineering friend calling that material "$hit mettal" For very good reasons I suspect. (Mazac? An Aly Magnesium alloy I think?)

Cheers.

Dave B.

Reply to
G8KBV

I had the ACR kit on the 2.25 in my Lightweight (before I went the V8 route). It was a nice kit - SU HF6, inlet manifold, cylinder head (with unleaded seats) and a new silencer. Sounded good, went reasonably well (although nowhere near V8 well) and the HF6 is a joy to tune after the

34ICH that was on there.

AndyC.

Reply to
Andrew Cleland

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