Oil pump question

[SpitFire6]

Hi,

 Do the following four 1147cc & 1596cc engines fitted to the Herald 1200, 1250 & Spitfire & Vitesse all have the same oil pumps?

Just curious.

Cheers,

Iain,

[NonMember]

I'm fairly confident that all 1147 engines had the same oil pump. It might even have been the same as the 1296. But I'm moderately sure it's not common to any of the six cylinder engines.

[Pete Lewis]

4 cyl pumps are common to all 4 cyl engine  herald spitfire  948, 1200 1296, 1498

6 cyl pumps ar common to all 6 cyl      Vitesse Gt6 TR6

if thats helps 

[SpitFire6]

Hi, Thanks,

Wonder why the Spit had a higher minimum pressure at 2K?

Cheers,

Iain.

[DanMi]

The oil pumps are slightly different early are iron later aluminium. Also the pickups are different, the early 1147 didn't have a strainer then they went to a straight pipe with a strainer and the later 1500 had an angled pickup and I believe a slightly larger pump. They will all fit though as I have the late angled type in my 1147. I can't see why the herald and spitfire would have different oil pressure as it's the same block crank and oil pump (for cars of the same period) 

[Pete Lewis]

pressure is controlled by the relief   valve  settings  not  directly by the pump 

Pete

[Colin Lindsay]

Most suppliers these days are selling the same spring for all 4 cylinder cars; 131535 or 131535UR. Early Heralds were 100420; I don't have the Spitfire manual to confirm but I'd guess that newer version is what's on offer these days for all 4-cylinder cars. It would be interesting to know the spec of the uprated version compared to the standard. Some suppliers are also selling the same spring for the 6-cylinder cars too. 

 

[Pete Lewis]

my  OE    WSM  for herald 1200  says as 1200 for  spit 1 2 3 + vitesse1600   with  pressure is 40 to 60 psi at 2000rpm    

dont have an OE wsm for mkIV and 1500 spit 

pete

[SpitFire6]

I wonder why the Spitfire 4 is 60PSI minimum. Clearances are the same?

 

[JumpingFrog]

1 minute ago, Spitfire6 said:

I wonder why the Spitfire 4 is 60PSI minimum. Clearances are the same?

 

My only guess is it's due to the Spitfire (pre Mk.IV) having cam bearings? All Herald and later Spitfire (Mk.IV) engines have the cam running directly in the block.

[SpitFire6]

Hi JumpingFrog,

 Are we confusing 4 with IV?

Cheers,

Iain. 

[NonMember]

10 hours ago, Spitfire6 said:

 Are we confusing 4 with IV?

I don't think so. He's pointing out that roundtail Spitfires (including the 4 but excluding the IV) have an engine difference that could, possibly, explain an unusual oil pressure specification.

[KevinR]

Cam bearings were used on the early mkiv engines.

dropped at engine number Fh25000, which was the same point of embodiment of the detuned  camshaft.  Prior to Fh25000 the mkiv engine used the same camshaft as the mkiii spit engine

[Pete Lewis]

so  Ian   where does the 60 come from  its not in any of the OE manuals i have ...  be it 4  IV or four  it seems a book typo problem or miss quote

all 4 cyl have the same spec whatever they are fitted to    some pump tolerances evolve but the base spec 40-60  x2000  is common for all time 

pete