Hi all,

Will be rebuilding an 1100S motor in the future, and conjuring up my parts list.



Going to keep the bore as close to standard as possible, i may even get away with a hone or 20 thou O/S
HIF44 with minispares inlet manifold.
Ported cylinder head, with standard 1100S valves.
LCB manifold

Fuel pumps?

As I'm looking for a little performance, but not a pig of a car to drive. Will a mechanical pump be ok, or should i fit a cooper s 'SU' type?

CP

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Craig
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1970 Morris Mini-Matic
1963 Morris Sports 850
1964 Morris 850

A mechanical fuel pump should be fine. I have pretty much the setup you describe in my Moke, although I'm using and HS4, the standard mechanical pump works perfectly.

Tim

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1951 Morris Commercial J Type Van
1955 BSA C11G
1961 Morris Mini Traveller
1969 Triumph TR6R
1977 Leyland Moke Californian

Depends on how much power you intend to make. 100bhp+ will starve of fuel with a mechanical pump and original 1/4 fuel lines (trust me, been there, done that and it's no fun).

If I were rebuilding, I'd skip the mechanical and just go straight for a high pressure, high output electric solid state pump with a good Holley pressure regulator, 5/16 fuel lines to replace the 1/4. That way there is room for any future expansion without future hassle. Set once and forget forever. BUT THAT'S JUST ME

It's not impossible to do AFTER the engine is in, but just more hassle that's all. Then you end up with a perfectly good used mechanical fuel pump lying around...

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Lillee - 1969 Morris Mini K

Nothing wrong with using a mechanical pump up to ~100HP, IF it's either new, or had a repair kit put in it.
The bakelite valves wear, and the diaphragms go hard with time.
Of course, so do they in SU electric pumps.... that's why I run a Facet electronic one.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I like mech pumps, much prefer the round-top SU variety to the Goss type, but both work, currently got a Goss feeding a set of twin SUs on the 1100S

cheers,

Jacob

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'72 Clubman Van - 1022cc, 295 head, 731 cam - Daily Driver
'69 Morris 1100 S - Dinged by a bus, in shed under repair
'64 Morris 1100 - Early 1100, long term project