Gold Seal Engine ? Anyone Help !!

[Robso96]

Hello can anyone help me ! I have recently just found a gold seal mini engine in one of my sheds and hoping to restore it along with the mini .

The engine was bored out to plus 20 and I believe that would make it a 1355 ?

I already know that these engines were sent to the mini factory to get refurbushed . The engine number/tags has been stamped with the two or three letters to show it has been to the factory also it starts with the letters BHM

If anyone has one of these engines or knows anything about these Gold Seal Engines ? please can you tell me if they are any good and any generel knowledge about them , would be a big help !

I also have tons of mini bits mostly engines and similar parts (no interior or bodywork stuff yet) Mail me or reply to this if you want anything is all really old stuff and would need to get a refurb cheers Robbie

[Extra 300 Driver]

Google it.

Factory replacement engine reference numbers (i.e. New, and Gold and Silver Seal units)

8G28 850cc - Oil feed to primary gear type crank with 1.375-inch tail shaft

8G35 850cc - Deva bush conversion type crankshaft with 1.375-inch tail shaft

8G45 850cc - Gold Seal, 1.5-inch self oiling primary gear/crankshaft type

GSE1101E 850cc - Gold Seal unit

RKM1101E 850cc - Silver Seal unit

BHM1307E 850cc - Gold Seal unit, 85H prefix replacement

8G18 997cc Cooper - Oil feed to primary gear type crankshaft

8G29 997cc Cooper - Deva bush type primary gear and crankshaft

8G36 997cc Cooper - Oil feed converted primary gear and crankshaft

8G33 998cc Cooper - Fitted with 28G193 (12G202) cylinder head

8G40 998cc Cooper - 28G222 (12G295)cylinder head introduced

8G42 998cc Cooper - Closed circuit breathing rocker cover and side plates

8G49 998cc Cooper - Purolator oil filter with oil light switch introduced

GSE1103E 998cc Cooper - Gold Seal unit, was RKM1120E Silver Seal

RKM1103E 998cc Cooper - Silver Seal unit

8G57 998cc - New from 1969 and exchange for all pre-A+ up to 1981

GSE1102E 998cc -Gold Seal unit, was RKM1119E Silver Seal unit, pre-A+ up to 1981

RKM1102E 998cc - Silver Seal unit, pre-A+ up to 1981

RKM1119E 998cc - Silver Seal unit, replaced by RKM1102E, pre-A+ up to 1981

BHM1232 998cc - Low compression dished piston, CAM6267 camshaft, early cylinder head

and crankshaft main bearings with side locator tang, A+

BHM1377 998cc - High compression flat top piston, CAM4717 camshaft, early cylinder head

and crankshaft main bearings with side locator tang, A+

BHM1458 998cc - Low compression piston, CAM6267 camshaft, late A+ cylinder head and

crankshaft main bearings with central locator tang, A+

BHM1460 998cc - High compression press-fit wrist pin piston, CAM4717 camshaft, late A+

cylinder head and crankshaft main bearings with central locator tang, A+

LBB10089 998cc - Low compression press-fit wrist pin piston, CAM6267 camshaft, lead -

free late A+ cylinder head and crankshaft main bearings with central

locator tang, A+

8G156E 1100cc - Clubman, Special and Austin 1100 (ADO16)

RKM1150E 1100cc - Silver Seal unit for Clubman and Special

RKM1151E 1100cc - Silver Seal unit for Clubman and Special

BHM1042 1100cc - New and Gold Seal units for Clubman and Special, 1974-1980

BHM1229 1100cc - New and Gold Seal units for Clubman and Special, A+ Block, 1980 on

8G38 970cc - Gold Seal unit, pre closed circuit breathing, Cooper S

8G41 970cc - Gold Seal unit with closed circuit breathing sideplates, Cooper S

8G46 970cc - Gold Seal unit withoil light switch in filter housing, Cooper S

8G133 1070cc - Gold Seal unit, pre closed circuit breathing, Cooper S

8G153 1070cc - Gold Seal unit with closed circuit breathing side plates, Cooper S

8G145 1275cc - Pre closed circuit breathing unit, Cooper S

8G154 1275cc - Closed circuit breathing side plates unit, Cooper S

8G155 1275cc - Oil filter housing with oil pressure light switch, Cooper S

8G174 1275cc - Fitted with AEG510 camshaft, Cooper S

38G464 1275cc - Introduced in 1970, most of which were fitted with EN16 Tuftrided

crankshaft

8G200 1275cc - New and Gold Seal units Clubman 1275GT

38G527 1275cc - New and Gold Seal units for engine numbers prefixed 12H706, 12H707 &

12H831 for Clubman 1275GT

RKM1130E 1275cc - Silver seal unit, was RKM1112E, for Clubman 1275GT, pre-A+

RKM1152E 1275cc - Silver Seal unit for Clubman 1275GT, pre-A+

RKM1112E 1275cc - Silver Seal unit for Clubman 1275GT, pre-A+

BHM1220 1275cc - A+ unit for Clubman 1275GT

8G199E 1275cc - Gold Seal unit with Duplex cam drive gears for 1300GT (ADO16) and

Innocenti 1300, 11-stud cylinder head

38G559E 1275cc - Gold Seal unit with Simplex cam drive gears for engine numbers prefixed

12H719 and 12H832, for 1300GT (ADO16) and Innocenti 1300, 11-stud

cylinder head

GSE1109E 1275cc - Gold Seal unit for 1300GT (ADO16) and Innocenti 1300, 11-stud cylinder

head

RKM1133E 1275cc - Silver Seal unit for 1300GT (ADO16) and Innocenti 1300, 11-stud

cylinder head

BHM1209E 1275cc - Gold Seal unit, replaced all Innocenti 1300 engines from engine numbers

prefixed 12H610, 12H635 and 12H832



Notes:

All engines pre-fixed with 'GSE' or 'RKM' were of UNIPART origin when BL split its parts organisation.



'E' at the end of a part number denotes it is a reconditioned, service unit only (basic engine assembly with no ancillaries).



'N' at the end of a part number denotes a brand new unit.

[Robso96]

yeah this finds out what the engine is , but it does not tell you how well the engine performs but thanks anyway

[Extra 300 Driver]

Robso96 said:

yeah this finds out what the engine is , but it does not tell you how well the engine performs but thanks anyway

How it performs? What do you mean?

+20 is 1293cc btw, not 1355

[Robso96]

I mean like does it have decent power ? and if its +20 in each bore it would make it 1355 !

[Extra 300 Driver]

Robso96 said:

I mean like does it have decent power ? and if its +20 in each bore it would make it 1355 !

I see you must be new to Minis and Maths.

+20 doesn't refer to +20cc per cylinder, it refers to +0.020in per cylinder bore.

+20 - 1293
+30 - 1301
+40 - 1310
+60 - 1330

And no, it wont make decent power, you wont be able to tell the difference between that and a standard 1275cc

[Robso96]

ahh right! I suppose it depends on alot of other things aswell like the head being skimmed , compression , ect to make it quicker ? and I am quite new to minis but my brother has raced ministox for 6 years and my dad has exprienced them for many years ! thanks for the help would that make it + 0.80 ?

[Skyedriver]

Robso96 said:

ahh right! I suppose it depends on alot of other things aswell like the head being skimmed , compression , ect to make it quicker ? and I am quite new to minis but my brother has raced ministox for 6 years and my dad has exprienced them for many years ! thanks for the help would that make it + 0.80 ?

??????????????????????????

[Robso96]

!!!!!!!!!!!!!!!!!!!!!!

[Robso96]

the pistons are also dished will this give me more power or up the cc ?

[guru_1071]

if its a +20 bore with a factory cam and factory fitted dished pistons, then its probably fair to say thats its not a performance engine - its just a factory exchange motor rebuilt using factory standard parts to be sold to a punter to stick into a standard car

a nice motor to use, as they are normally built to a decent standard, as the factory would just scrap anything that was worn past what they considered to be an acceptable tolorance.

a fire breating, hi-po machine it will not be though.....

[Robso96]

ok thanks for the advice ! I know that somebody else had the engine quite some time before I did , so I think they got it bored out and put +20 pistons in aswell ! not sure if there are any other mods to the gearbox , cam or crank ect . I will need to google some of the part numbers to see also It had a k and n air filter and 3 branch manifold ,hif44 carb ! i think it might have had a stage 1 or stage 2 kit on it possibly ? once I get it built up and the new parts put on it we will se how quick it goes