Morris Minor Owners Club

What's the best engine to source to increase the power of my pick-up?
I want more power but not so much that I'd need to upgrade the suspension. I would, however, convert to front disk brakes and a servo. The bigger engine would also need to work with my reconditioned standard gearbox.
I'm running a 'car' ratio diff.
Are there any companies that sell mildly tuned/bored-out 1275 engines off the shelf, ready to drop in?

TIA Chris

The Marina 1275cc engine is a good engine to fit in your vehicle.
To enable the fit you will need a rear engine plate and modified flywheel. The front engine plate will need to be changed to the Minor front engine plate as the Marina and Minor engine mounts are different.
All of the above is easy to do. Plenty of examples on here which can be found using the search facility.
If you want a ready converted engine you will in all probability need to give in a 1275cc engine that can be reconditioned.
The Marina engine will work with your reconditioned gearbox.
Here is a reasonably priced Marina engine:-
https://www.ebay.co.uk/itm/234289565826 ... SwVe1hk25j

Thanks Phil.
Will the engine plates I need swap straight off my 1098 engine?
How is the flywheel modified? (can I use the flywheel off my 1098?).

Cheers Chris

The rear engine plate off the 1098cc engine will not fit the 1275cc as the 1275cc oil pump housing is in a different place radially.
Also the hole for the rear crankshaft cap is larger on the 1275cc engine. A suitable rear engine plate is available from ESM Morris
.https://www.morrisminorspares.com/engin ... ew-p830099
The front engine plate off your 1098cc engine will fit straight onto the Marina engine. If you retain the simplex timing chain tensioner you will have to drill a couple of extra holes in the plate to facilitate the tensioner. Use the Marina front plate as a pattern.
The 1098cc flywheel will not fit the 1275cc Marina engine as the Marina engine has one location dowel and 6 securing bolts. Again a modified flywheel is available from ESM Morris.
https://www.morrisminorspares.com/engin ... s-p1239064

Thank you very much Phil.
I did start searching for info but didn't get very far

A question and answer session like this is very good proof of the worth of dedicated sites like this one and why we need to retain them, rather than all decamping to the likes of Facebook.

Agreed, Mike. With forums/sites like this, there is record of questions, comments and in most cases, solutions to any issue raised. It's then there as a reference point for for anyone to use, whether paid-up MMOC members or not.........but best not to go down that go down that particular rabbit hole again, so soon after going down the last one.

What is the main differences between a Marina 1275 and a Midget 1275? Is one more desirable than the other?

The main visible difference between the 1275cc Marina/Ital engine and a 1275cc Midget engine is the position of the oil filter.
The Marina/Ital has a different crankshaft and con rods to that of the Midget. The Marina/Ital flywheel is larger and the timing chain arrangement is different. The Marina/Ital has a Simplex timing chain with tensioner and duplex timing chain without tensioner on the Midget.
The best and most desirable combination is Ital 'A' Plus block (without casting hole above the centre main), Midget crankshaft (preferably cross drilled, wedged, tuftrided and balanced), Cooper S con rods (preferably in EN24V steel & balanced) and duplex timing chain with Marina/Ital tensioner.
The above have been used in the build of my 1380cc engine.
Some early 1275cc Midget crankshafts were produced in EN40B but are now a rarity. Those crankshafts were nitride treated.

Forgive the intervention - what is the advantage of cross-drilling a wedging?

Cross drilling the crankshaft ensures that oil gets to all of the bearing surface. Centrifugal force if the crankshaft is not cross drilled will starve oil from one side of the crankshaft.
Wedging the crankshaft gets rid of excessive weight. Losing weight from the crankshaft allows for quicker pickup and more reliability at higher revs.
Note:- the webs of the crankshaft in the photo below have been reduced/wedged. It has also been cross drilled, tuftrided, checked for trueness and balanced.

I've often thought about a small turbo or a supercharger on the 1098, they don't really like revs so traditional power tuning is not really appropriate but something giving around 5psi of boost and sized to push the torque up by around 30% would make a great road engine.

http://www.podifold.com/?fbclid=IwAR2U6 ... K5c1ahd164


John ;-)

Would there be enough clearance between the SU carb/air filter and the bulkhead/battery box?

That is a good looking kit.

Would there be enough clearance between the SU carb/air filter and the bulkhead/battery box?

I guess your comment means that you doubt it Phil -- I do.

I think it might need a different intake to the SC, perhaps a right angle shape that would point the carb's intake to the passenger side. But then it might be necessary to move the wiper motor

Don

That looks very interesting indeed!
Regards
Declan

" Would there be enough clearance between the SU carb/air filter and the bulkhead/battery box? "

I very much doubt it , but , if it were a non modified Eaton M24 placed with the pulley in-line with the crankshaft pulley , admittedly a different head/supercharger casting would be needed ( offset ) , then it might fit ?

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John ;-)

I wonder if the carb to charger adapter was flipped would that give enough room to clear the cross member.

Image?
From the above ( with a pancake type filter fitted ) can anyone give an educated guess whether it would fit ?

John ;-)

panky wrote: ↑Fri Dec 03, 2021 2:05 pm I wonder if the carb to charger adapter was flipped would that give enough room to clear the cross member.

I don't think so, the adaptor is sculpted to the charger..
John ;-)