17 replies to this topic

[MiniTim71]

 

Hi all. my '71 Morris 1000 has an ex Metro 1275 (low compression) and it is currently being rebuilt to "stage 2" with a Kent MD246, for road use.

I asked for it to be re-bored to +40' 1310cc.

However when I was sent photographs of the build I noticed they were using AE Nural HC +20' pistons.  A little unhappy, I questioned this and you wont be surprised to hear that the block was factory lined and +20' was as far as they could go.

The build is underway and they accept they should have told me.  They said If I get them another block they will give me what I asked for.

 

Do I stick with it or look for an unlined block?   (this is a technical question, ignore cost)

Opinions welcome ...

AC ?

Stick with what you have got.

 

The liner's better ring seal and lower friction are at least equal to the increased capacity of a .020" larger bore, in an engine with your proposed state of tune.

 

Special Tuning asked Downton to put liners in the works 1300 class race engines.

 

 

Deadsquare, many thanks, I appreciate the reassurance that continuing is the right thing to do.

[Midas Mk1]

Hi all. my '71 Morris 1000 has an ex Metro 1275 (low compression) and it is currently being rebuilt to "stage 2" with a Kent MD246, for road use.
I asked for it to be re-bored to +40' 1310cc.
However when I was sent photographs of the build I noticed they were using AE Nural HC +20' pistons. A little unhappy, I questioned this and you wont be surprised to hear that the block was factory lined and +20' was as far as they could go.
The build is underway and they accept they should have told me. They said If I get them another block they will give me what I asked for.

Do I stick with it or look for an unlined block? (this is a technical question, ignore cost)
Opinions welcome ...
AC ?

Hope your not expecting much from a 246, a 266 is a very mild road cam just to compare.

Hi, not quite sure what point you are making here? My question is asking for opinion on a sleeved block build.

Regarding the MD246 It has been recommended to me from a number of directions. I am not looking for a weekend warrior / boy racer, more a fun torquey road engine in a cute looking Mini.

From Kent
"MD246 The ultimate high torque sports road touring camshaft. The combination of maximised lift with short duration makes this a superb road camshaft in all engine sizes. CNC ground in the UK for precision and reliability - often imitated, never bettered."

My point? your complaining about not having a large overbore, and feeling the difference over +20.

I’d be more looking at the camshaft choice.. 246 is as mild as a no filling sandwich. Atleast have a cam that you can feel the difference over oe.

Nothing wrong with a linered block at +20.

Edited by Midas Mk1, 07 March 2024 - 09:31 PM.

[alpder]

 

 

Hi all. my '71 Morris 1000 has an ex Metro 1275 (low compression) and it is currently being rebuilt to "stage 2" with a Kent MD246, for road use.
I asked for it to be re-bored to +40' 1310cc.
However when I was sent photographs of the build I noticed they were using AE Nural HC +20' pistons. A little unhappy, I questioned this and you wont be surprised to hear that the block was factory lined and +20' was as far as they could go.
The build is underway and they accept they should have told me. They said If I get them another block they will give me what I asked for.

Do I stick with it or look for an unlined block? (this is a technical question, ignore cost)
Opinions welcome ...
AC ?

Hope your not expecting much from a 246, a 266 is a very mild road cam just to compare.

 

 

Hi, not quite sure what point you are making here?  My question is asking for opinion on a sleeved block build.

 

Regarding the MD246 It has been recommended to me from a number of directions.  I am not looking for a weekend warrior / boy racer, more a fun torquey road engine in a cute looking Mini.

 

From Kent

"MD246 The ultimate high torque sports road touring camshaft. The combination of maximised lift with short duration makes this a superb road camshaft in all engine sizes. CNC ground in the UK for precision and reliability - often imitated, never bettered."

 

I have MD246 in a 1310, 3.1FD. Built it with towing in mind. Can't compare to anything else (my first Mini) but I can say that the torque is just always there, even at the bottom end. And it idles smoothly. Main downside is that I keep trying to change into non-existent 5th at 45mph. If I ever have the engine out again, I'll give it a longer FD.