Which 1275cc to use ?

Side valve, 803, 948, 1098., 1275 and Vizard mods

Which 1275cc to use ?

Postby hillymole » Sun Oct 08, 2017 7:46 am

I have 2no A series 1275cc units. One of which I intend to fully overhaul to go in My traveller with a 5 speed Sierra box conversation.
ENGINE 1
Currently installed in the posh Traveller.
Ex Marina unit, oil filter top rear. Not a ribbed A+ block. Currently on a pair of ex midget SU HS Carbs with noisy Chrome pancake filters.
ENGINE 2
Currently in installed in laid up Traveller (Someone,s future project, not mine tho)
Ex late Sprite Midget Engine, bottom canister oil filter, single 1.75" HIF SU Carb (almost certainly OEM carb unit). Replaceable element air filter.
As I need to specify the unit for ordering the gearbox conversation kit, re clutch & flywheel issues . Need to make a decision.
Both units are good runners so neither is self electing by mechanical issues.
Appreciate opinions from contributors more knowledgeable than me
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Re: Which 1275cc to use ?

Postby ruairidh » Sun Oct 08, 2017 9:38 am

I would go with the sprite engine as it is a much better engine.
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Re: Which 1275cc to use ?

Postby Andy W » Thu Oct 12, 2017 10:20 am

ruairidh wrote:I would go with the sprite engine as it is a much better engine.


That's a shame....my Traveller has a Marina lump..! :(
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Re: Which 1275cc to use ?

Postby MM » Sat Oct 14, 2017 5:05 pm

I would also be inclined to use the Sprite engine, as you get a tuftrided EN16T crank, and in some cases, Cooper 'S' type AEG521 con-rods. Some early 1275cc Marina engines were reknowned for running a bit rough, and they later fitted a large crank damper to try to cure the issue.

I have a circa 1970 12CE Midget engine in my Traveller, which has performed very well for the past 60,000 miles or so. So well, in fact, that it has broken at least two halfshafts and ribbed-case gearboxes! :lol:

The 1.75" HIF wouldn't have been a standard Midget/Sprite fitment (most had a pair of 1.25" SUs), but will work nicely with any 1275, generally being as good on power as the twin SUs, but with better driveability and lower maintenance required.

The Sprite engine will also be worth more, should you later decide to sell it on, with good runners going for around the £1,000 mark right now!
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Re: Which 1275cc to use ?

Postby hillymole » Sun Oct 22, 2017 8:52 am

The Sprite engine is a 12ce, so I will go with the majority here and pull that one apart for the FULL works overhaul. The donor traveller will have a good complete 1098cc put back into it and with a general sort around to brakes etc, then off to Classic car auctions in the Spring.
Thank,s all for your input.
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Re: Which 1275cc to use ?

Postby MM » Sun Oct 22, 2017 1:48 pm

I'd be interested, while you have it all apart, to hear what crank and con-rods you have in yours; mine has IIRC, the EN16T crank (which is I gather, tuftrided) and AEG-521 Cooper 'S' type rods. Also, are the block cylinders linered, as mine are?

Also, which engine number is yours? Mine's a 12CE-DA-H 10087, which I think is around 1970, since another 1970 MG Midget had a 12CE-DA-H 12154 fitted.
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Re: Which 1275cc to use ?

Postby hillymole » Tue Oct 31, 2017 9:37 am

MM, just checked the engine number on the Sprite /Midget unit it is 12CE-DA-H-16891.
The block is painted in a non std dark Green so reckon it might have had a short engine job done in the past.
Be a while before the engine comes apart as 1275 Marina currently installed in the best Traveller is going well. Having done a absolute top to bottom refurb on one Traveller back to all std. (except for engine). I now move on to the Big Boys Toys items. That is Type 9 5 spd. Gearbox, Marina discs set up, Servo, 14" Miniltes.
The list will grow until the Wife drives a 6"nail thru the cheque book ! The refurb of the Sprite 12ce unit & install will be on the list.
What I need from the MMO community now is the answer to the indoors question." When our Traveller is now finished and in Show condition why do you need to spend another £*****" on it ??
Prizes will be awarded for the answer that works.
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Re: Which 1275cc to use ?

Postby Sleeper » Tue Oct 31, 2017 12:13 pm

"Marina discs set up, Servo"

To make sure you're safe darling

John ;)
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Re: Which 1275cc to use ?

Postby GraemeT » Thu Nov 02, 2017 11:16 am

" When our Traveller is now finished and in Show condition why do you need to spend another £*****" on it ??

Obviously because older cars need daily/careful maintenance in order to retain (1) show condition and (2) driveability. That way they will last and last and, hopefully, be passed onto future generations.

Modern cars. of course, need none of this and will expire after ten years despite however much money you throw at them.

Would that do?
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Re: Which 1275cc to use ?

Postby hillymole » Sun Nov 05, 2017 7:52 am

Thanks all,Yes we are making progress re next Moggy expenditure, but------------------------------ on the understanding SHE will feel entitled to go out & buy another bl---y horse. (Why would you need 4 horses, maybe 1 for week days & a nice one for weekends, yes but 4 !)
So now looking for 5 speed type 9 conversion kit and a 16+ hand eventer. Game set & match to the Missus .
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Re: Which 1275cc to use ?

Postby dp » Sun Nov 05, 2017 3:45 pm

Just out of curiosity, was the Marina A series simply a cost cutting version of the Midget version or did it have later refinements? Also, are the better bits: tuftrided crank, better rods etc easily available from Mini tuners and would they fit the Marina?
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Re: Which 1275cc to use ?

Postby Custard » Sun Nov 05, 2017 9:16 pm

Yep, Moggy is probably cheaper to run than a horse.

Don't have to fuel the Moggy when you not using it and when its poorly it will wait till you save up to fix it. :D

Not sure which is better engine, but it is a bit more involved putting the Marina engine in due to Starter Motor position and flywheel.

Crank is the one thing that cannot be swapped as the frontwheel drive clutch arrangement means it is totally different to a rear wheel drive one.

When you look at reference data such as the Vizard book you can see which engines have the same bore stoke and see which Mini Bits will fit.

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Re: Which 1275cc to use ?

Postby MM » Mon Nov 06, 2017 11:10 am

dp wrote:Just out of curiosity, was the Marina A series simply a cost cutting version of the Midget version or did it have later refinements? Also, are the better bits: tuftrided crank, better rods etc easily available from Mini tuners and would they fit the Marina?


It did have some 'refinements' such as the oil filter being mounted above the distributor, making for easier access (so a completely different block casting, for starters). I gather the crank was just a regular cast steel item without the tuftriding, so not as tough as the Midget's, probably same goes for the con-rods, which are most likely heavier, hence not so good for prolonged high revs.

Nevertheless, it probably makes for a useful power and torque upgrade over the standard Minor engines, and yes, you could always uprate certain parts if required.

Plus, you can fit the matching gearbox which although heavier and bulkier, gives you synchromesh on 1st.
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