1098 crank into 948

Post by **sii803** » Thu Jan 06, 2005 2:11 am

Happy new year all.

After much searching I have not been able to find myself an inline 1275 or 1098 motor in australia. I am quite sure that the shipping costs to get one here from the UK shall prove prohibitive. I have however found myself a new old stock 1098 crank that is going for the price of one used transverse 1098 crank ( fair trade I'dd say).

So, can I fit a 1098 crank to a 948 block? I have not yet seen it and can not yet verify if it has the 1.75 or 2inch mains.

Is the center main bearing going to be narrower on the 1098 ( i understand you can narrow the block here)?

As the 998 trasverse crank (same stroke as the 948) can be swapped with its 1098 counterpart, am I right in thinking I should not have difficulties with deck height if I use 1098 rods and pistons?

How am I going to go in the cluth/gearbox department with a 948 box? 1098 box will not be avialable.

Has anyone fitted 998/1098 pistons to a 948 block recently (or similar overbores)? I know vizard says its possible but the walls of most blocks have become thinner since then.

I would really appreciate anybodys thought or experiences on the matter.

Thanks

Post by **brixtonmorris** » Thu Jan 06, 2005 10:59 am

you cant.if i remember correctly
i think the throw is to large .
it wont rotate

Post by **ianselva** » Thu Jan 06, 2005 3:53 pm

I'm almost certain you can't. I went into a lot of detail some years ago when I needed a 1100 engine for my Racer. As the class max was 1100 I would have to find a standard size 1098 block , and in the end I fitted +060 Metro pistons to a 948 block giving 1060cc.

Post by **sii803** » Fri Jan 07, 2005 1:05 am

brixtonmorris wrote:you cant.if i remember correctly
i think the throw is to large .
it wont rotate

I've seen vizard fettle the blocks to clear long stroke cranks in big bore motors. I might have a look anyway, for the price of the cheap crank I don't mind a bit of grinding and machining.

Ianselva,
the metro pistons were they 60+ on the 948 or 60+ on the metro? Are metro pistons like a 998 piston (we dont have metros in australia)? Did you have any trouble going through bore walls into water jackets?

Thanks alot for the feedback, I guess i'm just going to have to try to fit the parts up to find out.

Post by **ianselva** » Fri Jan 07, 2005 8:55 am

They were 998 Metro +060 and all the bores were OK, no sleeving required. I seem to remember that I never got as far as measuring the crank clearance as there was no rod/piston combination that would give even closely the right compression height with a 1098 crank.

Post by **sii803** » Wed Feb 02, 2005 2:29 am

Can anybody identify the part number 88g202

Post by **ianselva** » Wed Feb 02, 2005 9:09 am

I think you'll find it is MG 1100 head.

Post by **sii803** » Wed Feb 02, 2005 10:26 pm

It is a crank, but I'm not sure exactly what it is. It is printed on a box and comes complete with bearings so the part number might be for the whole kit?

The most popular heads ( in australia) for the 1098 are the 12g295 and the 12g202. i believe the sequence 12g is related to all heads. I'm hoppnig that 88G relates to all cranks, though I suspect it may relate to crank and bearing kits. I also understand that the part number is one less than the number on the part. Something to do with drawing numbers and the like.

Thanks all the same.

Matt

Post by **rayofleamington** » Thu Feb 03, 2005 9:48 am

the part number is one less than the number on the part. Something to do with drawing numbers and the like.

yes and no - Sometimes the number on the part is the casting number, and the part number relates to whatever it got machined into (ie one casting could be used to make parts to a number of different drawings)

Post by **bmcecosse** » Thu Feb 17, 2005 11:40 pm

The 1098 crank should go straight in - but of course you need 1098 pistons which are shorter than 948 pistons. To get them to fit you will need to bore + 65 thou.

Post by **brewbags** » Sat Apr 16, 2005 4:51 am

Hello from Adelaide, Australia. I can't be certain on your crank swap, but I can advise you on your other question, overboring 948 block. I have just fitted 0.040"+ 998 pistons on a rebuild of my 948 block. No problems with this overbore in my case.
QUESTION:
Can anyone advise which engine backplate I need to use to fit a ribbed 1098 gearbox to my 948 block. I have the thicker 1098 back plate and I also have the pressed metal backplate from the 948 engine. Can anyone help?? the plates are interchangable, but one is substantially thicker than the other......
regards, Peter

Post by **Peetee** » Sat Apr 16, 2005 1:35 pm

I had a 948 with a 1098 box. Looking at the photos it appears to have a backplate with a edge that curves away from the engine. Would that be the pressed plate?

Post by **bmcecosse** » Sat Apr 16, 2005 3:51 pm

Sii803 - did you go ahead with any of this ?

Post by **brewbags** » Sun Apr 17, 2005 1:09 am

Peetee; The backplate you describe is the pressed metal one. Can I assume that you also used the 948 flywheel and clutch as well as the pressed steel backplate with this gearbox?

Post by **bmcecosse** » Sun Apr 17, 2005 7:37 pm

The blocks are the same. So use the backplate intended for the gearbox you are using.

Post by **sii803** » Fri Apr 29, 2005 4:26 am

Sii803 - did you go ahead with any of this ?

I'm still trying to get the owner to part with it. He has grown attached to it since the prospect of swaping it came along. Bugger!

Morris Minor Owners Club

1098 crank into 948

1098 crank into 948

1098 Crank into 948