12 replies to this topic

[frosty90]

Hi all,

I’ve got. 1991 mini city with a 1380cc with a kent 286 cam.

Is there any reason it shouldn’t pass a mot on emmisons? I’ve been told that it won’t pass due to the cam by the garage

Thanks I’m advance

[DeadSquare]

The only way to find out is to have it tested.

 

Is it still on SU carbs ?

 

If so, you could lean the mixture, which might help a bit

[frosty90]

yep its got a HIF44 carb on it. 

 

Its been through MOT before with same engine but they are saying laws have changed and it wont pass now.....

[DeadSquare]

This is a reason why I don't like A+ blocks.

 

With removable tappet chest covers, it was only a couple of hours work to change the cam in situ, --- pass the test with a standard cam  and swap it back in the evening.

 

The lumpy idling doesn't help, so you could try getting tick-over up to 2,500 RPM.

[KTS]

sounds to me like they want you to take your business somewhere else...

[sonscar]

The emission targets may change but it is not retrospective although there has been some tightening up on "did this vehicle originally have a cat fitted?Even if emissions are ok a visually missing or altered cat is a fail"1991 is right in the cat era where it seemed a lottery as to fitting.my limited experience with large cams is that they pass unburned fuel straight through the motor at idle due to the overlap and emissions could be challenging.Go somewhere else.Steve..

[cal844]

Sooo a little bending of the rules required on this one...... Lift the rpms until a non lumpy idle is achieved, use that for the idle measurements on the machine, then do the fast idle test.


Your 1991 car may or may not have had a cat, only the manual will know. I'm sure cats were 1992 onwards BUT it can be argued that the engines haven't changed from the 80s sooo they don't need a cat to pass

Edited by cal844, 07 September 2023 - 09:00 PM.

[frosty90]

Thanks all, I’ve taken it back going elsewhere now

[Midas Mk1]

Got to love this forum when someone suggests changing cam for a mot 😂

[gazza82]

This is a reason why I don't like A+ blocks.
 
With removable tappet chest covers, it was only a couple of hours work to change the cam in situ, --- pass the test with a standard cam  and swap it back in the evening.
 
The lumpy idling doesn't help, so you could try getting tick-over up to 2,500 RPM.

Do any 1275 blocks have tappet covers? My Spridget engine doesn't.

[Homersimpson]

 

This is a reason why I don't like A+ blocks.
 
With removable tappet chest covers, it was only a couple of hours work to change the cam in situ, --- pass the test with a standard cam  and swap it back in the evening.
 
The lumpy idling doesn't help, so you could try getting tick-over up to 2,500 RPM.

Do any 1275 blocks have tappet covers? My Spridget engine doesn't.

 

The original Cooper S engines did and also the engine in the 1300GT I seem to recall was basically the same.

[imack]

1300gt didn't have tappet covers. It had improved components over a 1275gt and a head shared with a mk3 Cooper S

[DeadSquare]

1300gt didn't have tappet covers. It had improved components over a 1275gt and a head shared with a mk3 Cooper S

My 1300 GT has tappet covers, and so does my 1275 Cooper S.