Camilleri Posted March 25 Share Posted March 25 Hello everyone 😀. I have just acquire a land rover series 2 engine (2.25 Petrol). On the side it has a badge fitted, indicating it was overhauled in October 1975 at workshop EC 02. Would anyone know if these engines were covnerted to unleaded at that time by any chance? Thanks in advance Regards Joseph Quote Link to comment Share on other sites More sharing options...
nathanglasgow Posted March 29 Share Posted March 29 Sorry to dissapoint but 1975 overhaul is too early for unleaded head. Mine was done at ECO2 as well in 1972 and I had the head converted due to severe valve seat recession but bizzarley it was only on one valve seat 1 Quote Link to comment Share on other sites More sharing options...
Richard Farrant Posted March 30 Share Posted March 30 On 3/25/2024 at 6:03 AM, Camilleri said: Hello everyone 😀. I have just acquire a land rover series 2 engine (2.25 Petrol). On the side it has a badge fitted, indicating it was overhauled in October 1975 at workshop EC 02. Would anyone know if these engines were covnerted to unleaded at that time by any chance? Thanks in advance Regards Joseph Hi Joseph, I was building reconditioned engines at that period of time at ECO2 and can tell you that they did not carry out unleaded conversions to cylinder heads right through to when they closed in 1996. Quote Link to comment Share on other sites More sharing options...
ruxy Posted March 30 Share Posted March 30 Generally speaking a S2A head would be 7:1 CR , I have a crated cartridge FFR Document states - Duration of test 1 hour (light run only) dated 24-4-81 by 44 Command Workshops REME , Engine type Rover 8-1 , the block is a new replacement and is heavily engraved 23700813A and I am quite certain the head is new and it's a S3 type (it has the head casting number of that time) . prefix 237 are quite rare (I think these were 8:1 cr) , most S2A are prefix 236 and these were originally 7:1 cr. I have only come across the infrequent prefix 237 engine. I took the head off - to have a look , no hard seats - reason for part strip - was the Concession - Engine fitted with a 'sub-standard' shaft, rocker. It will have no effect on the engines performance - well that's arguable. What they did was to drill a new location pin hole and reversed the shaft 180 degrees LoL Good practice for some. I have no opinion for if 8:1 cr is better than 7:1 cr when run on E10 , since unleaded petrol & apparently more valve seat regression - I just use Wynns petrol additive & await a burn seat or valve & then ponder blaming lack of lead or ethanol ? The first pet. Defender (known as the 2.3) were 2286cc - they IIRC received rotator valves but no hard seats & the even later 2490cc (known as the 2.5) DID have hard exhaust seats , both Defender pet. engines had a Weber twin-choke and revised inlet/exhaust manifolds. IMHO the S3 5mb engines are better than the 3mb engines , a Defender pet. engine costs more £ for any work you complete. When I want a hard seat job - I will make a crate for the head & post it to Turners who have done lots , would not trust any of the local to$$er reconditioners. 1 Quote Link to comment Share on other sites More sharing options...
Camilleri Posted April 1 Author Share Posted April 1 On 3/30/2024 at 10:42 AM, Richard Farrant said: Hi Joseph, I was building reconditioned engines at that period of time at ECO2 and can tell you that they did not carry out unleaded conversions to cylinder heads right through to when they closed in 1996. Thanks Richard that was very helfpul Quote Link to comment Share on other sites More sharing options...
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