27 replies to this topic

[Sprocket]

above 73.5mm the blocks liable to flex, and not all blocks can be taken out to 74mm anyway, I have one in my garage which blew an oil way when bored to 74.

Bore flex is a myth. No more than a 73.5mm bore.

I am running 74mm bore, never had an issue with the bores/oil galleries. First block first bore and its fine

[Jammy]

Moved.

[Guess-Works.com]

MS, it's the oil pressure relief which is close to the cylinder wall...

[Clubby1275GT]

no offence mate but i think ur looking to do up the wrong sort of car! if u want to go getting a massive engine, to then crash and swap back ur mad, plus if u want to go as big as u can then i hope you have some deep pockets.

and im sorry but if u were my mate and i was in hospital because u just binned ur 1380 mini into a tree and was more bothered about swapping it back than your injured friends then u shoudnt even have a licence

[Sprocket]

MS, it's the oil pressure relief which is close to the cylinder wall...

Yes. Infact its also the main oil feed to the front of the block as well, seen here.





Like i said its not an issue. Unless you think like that. There are ways and means. Dont say its not possible when it clearly is, this is missleading people. Any big bore block can be machined to 74mm. Unlike trying to machine an 850 block to 70.61mm . Granted the likelyhood of your average punter boring a block to 74mm or more for that matter is slim due to the rarety of pistons. These points are why 73.5 is more popular. Theres 0.010" in it. Plus, where the problem area is, is below the rings so wont see any cylinder pressure. Sounds like you gave up on yours. They are real nice torquey motors

Like i said there ways and means. If you know it happens you can fix it before it actualy does Though if you do it right in the first place it wont happen

Edited by Mini Sprocket, 11 December 2006 - 08:12 PM.

[vasi]

Very valid points MS, I am quite sure, however that you skimmed a little too much off that block.

[Sprocket]

Supper short stroke

[fikus01]

have you got any more pictures of the a-series block like that?? also just curious but i have a marina 1300 block thats been mated to a mini gearbox with a mini crank!! any ideas behind why?? was the marina block better?? it has a screw on oil filter where the pipe would normally come out and go to the filter housing and for those doubters out there its not a twinpoint block!! i've had it since before they came out and it was old then!!!!

Edited by fikus01, 12 December 2006 - 01:57 AM.

[flamejob]

...agreed those pics are great


More!

[Sprocket]

i have a marina 1300 block thats been mated to a mini gearbox with a mini crank

I want detailed, High resolution pictures of this block inside and out. You supply this and i shall supply you with high resolution detailed pictures of a sectioned std bore A+ block.

Ive been looking for one of these for some time to see what its like

Do you intend to sell it???

[Guess-Works.com]

I have a feeling that the 1300 used in the Montego and Meastro were very similar to the Marina block wise (with the oil filter attached to the block TPI stylee )

[edjohnson]

People who dont fancy telling there insurers really pee me off

its those people that make driving more expensive than teh rest of us.

I really dont think a 1275 metro engine bored to 1293cc with a few decent mods would cost much more than a standard 998 , with a specialist insurer such as herts or flux.

They appreciate that mini drivers who mod there cars are likely to look after there investment,a nd not write it off as many saxo owners do.

Im no saint, ive written off a few cars, and have a few points, but everytime the car was fully legal, insured, mot'd and above the law.

Im sorry, but as said before, maybe you really should think this through.

And as for changing the engine after an INCIDENT, yeh right, as if.

If you serious about all this and not tallkin out your back end, pull yer finger out, get a metro engine, spend the moeny, but for everybodys sake, get it insured appropiatly.

You wont get insured on anything worth anything if you get caught, have a black mark against your name and always be known to the insurance industry as a pillock.

Have fun

Ed

[fikus01]

filter kinda mounts like a tpi but kinda not!! its mounted upwards at an angle of 30degrees or so!! i assume for a reason !! i'll have to dig out my engine from the shed its in!! to be honest i havent had a use for it yet but im definately not parting with it purely because its so rare!! (i know this because i've only seen 1 other!) had a flick thru the vizzard book and he mentioned it for big bore motors but didnt say mcuh why it was the best to use!!

it is in a sorry old state, pistons rusted into block etc, if i use it itw guna go big bore (possibly short stroke) and i'll have it all macined flat before i start. i just consider it a part of the blocks weathering process!! shud make it a nigh stress free block when i come to use it unless you want to offer me silly money for it!!