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blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17357

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

The 2286cc cylinder head was available in the two different forms, one for a 7:1 and the other 8:1 compression ratio. I don't believe that the LC head was specifically export and the HC home, although there would probably have been more LCs sold abroad than home.

My old (sadly now sold) 1961 home market SII 88" had an LC head from new. The ex-MoD 3MB engine which I fitted into my SI 86" (before such vehicles became insanely collectible and hence engine conversion got you burned at the stake) has an HC head.

I suspect that is it more down to luck of the draw and where the donor engine came from. Assuming that you head is unmodified, you might consider obtaining an HC head, modifying it for unleaded fuel, and replace your LC head with it. You probably wont be blown away by the performance increase though.

I've never actually taken any measurements to confirm this, but I have been told that the basic casting for the head is the same for both, but the mating face of the HC heads has been machined with a deeper cut to reduce the size of the combustion chambers. This makes it possible, I have been told, to skim a 7:1 head to turn it into an 8:1 head.

17th Jul 2023 12:11pm

MercianRover

Member Since: 07 Apr 2022
Location: Culworth
Posts: 141

1998 Defender 110 300 Tdi CSW Java Black

Long ago the 7:1 CR cylinder head was replaced with a gas-flowed ACR high-compression cylinder head with SU carburetter - so the old Rover isn't lacking in power.

17th Jul 2023 2:37pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17357

With protection against exhaust valve seat recession?

17th Jul 2023 3:46pm

MercianRover

Member Since: 07 Apr 2022
Location: Culworth
Posts: 141

Yes, ACR provided that as part of a complete package.

Anyway, back on topic some research this evening hasn't thrown up any useful leads.

The best alternative aviation connection is Speke (now Liverpool John Lennon) where there were a few operators of the Viscount airliner but I'd be surprised if that warranted a dedicated "local" Land-Rover, a van would suffice on the pan.

The original buff logbook and petrol ration book was accidentally disposed of by my parents years ago, each blaming the other so that resource is lost.

When I was doing some repairs to it a year ago there was evidence of red paint under the vent flap hinges, not sure if it was factory red or over painted. Suspect that a corporate purchase would buy the colour they required ex-works.

I need to pay Gaydon a visit.

Alternative is the plate was never originally associated with the vehicle but had some sentimental value so was fitted to it by the owner.
.

4th Aug 2024 10:43pm

defender9

Member Since: 12 Mar 2016
Location: Fylde Coast
Posts: 1629

2015 Defender 90 Puma 2.2 SW Keswick Green

MercianRover wrote:
Long ago the 7:1 CR cylinder head was replaced with a gas-flowed ACR high-compression cylinder head with SU carburetter - so the old Rover isn't lacking in power.

My Series 1 has an ACR head, cam and SU carb. Roland at ACR knows his stuff and albeit a tad expensive the modifications make it comparable to a Tdi. For those of you who know the A6 Road over Shap Fell, in some of the steeper climbs you can be down to 2nd gear in a Series 1, with the ACR conversion it will go up in 4th and not struggle.

15th Aug 2024 9:17am

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