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Rover v8 engine code
Posted: Fri Jul 02, 2021 7:25 pm
by rich112
Hi all,
Got a Rover v8 with an odd code that I can't find anywhere.
Anyone know what it might be?
Comp Ratio 9.37:1
S81D00589A
The only S numbers I found was for a Morgan...
Cheers!
Re: Rover v8 engine code
Posted: Tue Jul 06, 2021 2:53 pm
by rich112
Turner Engineering were able to identify the motor as a 4.6 MEMS export market in a Discovery.
Re: Rover v8 engine code
Posted: Wed Jul 07, 2021 3:59 pm
by ChrisJC
Interesting. Although I am not sure what they mean by a MEMS engine?!
Chris.
Re: Rover v8 engine code
Posted: Tue Jul 13, 2021 9:15 pm
by rich112
MEMS is pre GEMS injection?
All I know is its the 4.0 block cross bolted, 4.6 crank, old style timing cover (with dodgy oil pump!) as its running a dizzy and carb. Possibly a 3.9 cam but who knows!
Re: Rover v8 engine code
Posted: Wed Jul 14, 2021 3:36 am
by garrycol
4.0 and 4.6 blocks are all the same. When built the blocks were given one of three classes depending how close they met specs. The highest spec class all became 4.6 engines, the lower spec class became 4.0 engines and the middle class went into either engine. Apparently a colour scheme was used to identify the different classes and an appropriate coloured dob of paint was placed on the inside of the blocks.
All 4.0/4.6 blocks are cross bolted and they run heavier cranks with larger diam journals which do not fit earlier 3.9/4.2/3.5 blocks.
As far as I am aware 4.6 and 4.0 were only ever fitted with Gems or later Thor injection systems - never heard of MEMS before - most likely of typo of Gems that has stuck.
Re: Rover v8 engine code
Posted: Wed Jul 14, 2021 8:27 am
by rich112
MEMS was a Rover ECU from the 90's.
Was used on a lot of Rover K series motors according to wikipedia.
Re: Rover v8 engine code
Posted: Wed Jul 14, 2021 1:08 pm
by garrycol
rich112 wrote: ↑Wed Jul 14, 2021 8:27 am
MEMS was a Rover ECU from the 90's.
Was used on a lot of Rover K series motors according to wikipedia.
So not a RV8 ECU.