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Author Topic: Engine rebuild  (Read 3585 times)
Wings
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« on: March 28, 2013, 11:54:09 AM »

Good morning,

I took my Mini up to Lewisville last week for a little bit a maintenace work. Will G. used to work for Bob's Tire & Auto and/or British Leyland Auto Center. I guess they've reorganized a bit and while the MG - Triumph business is still handled by Bob's the Minis are now being serviced by "Miatas, Minis and More".

Anyway..... They took care of an issue I had with the clutch and another with the Weber. My car has a very noticeable oil leak and they've told me sooner or later (probably sooner) it needs to be fixed. The oil pan gasket is the culprit and I understand the engine/transmission will need to be pulled to replace the gasket.

As long as the motor is out, it's probably time to address the bigger issue, poor compression in two of the cylinders. The car runs ok but it really doesn't have much zip. I'm sure Will and the rest of the guys up there can handle the rebuild but I'm curious to hear what you guys have to say when it comes to selecting a shop for major engine work. While it's being torn down what are your thoughts about adding a few extra HP to the final project. I'm not intersted in a high strung race motor but I'd like to have a little extra power as long as it's not going to cost me an arm and a leg.

Any thoughts, suggestions, recommendations and warnings are appreciated.

Paul
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2013 JCW Chili Red/Chili Red
1991 Mini Cooper Red/White 'Matchbox'
BritBits
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« Reply #1 on: March 28, 2013, 11:03:28 PM »

remind us of what you have in it's current form?

The neat thing about the Mini is that there are so many choices available, as they made so many for so long.

Easy things are a slight compression bump and a more sporty cam.

Cheers,

Jim
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Wings
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« Reply #2 on: March 30, 2013, 09:13:30 PM »

Thanks Jim. I'm not really sure what I have in the first place. It's a Re-VINed car and the best I can tell it's probably a 1991. It's got a 1275 with a rod shift transmission. I was told that at some point the motor was 'redone' and some things were added but I have no paper trail to prove what was or wasn't added beyond the Weber carb. On a previous visit Will pulled the rocker cover and said it looked like some better pieces had been added to the valve train but I couldn't tell you anything more than that that. It's got an aftermarket exhaust too but I'm sure that's mostly for sound effects.

Paul
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2013 JCW Chili Red/Chili Red
1991 Mini Cooper Red/White 'Matchbox'
BritBits
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« Reply #3 on: March 31, 2013, 09:39:48 PM »

Actually, let's step a minute or two....  you've got 2 cylinders down in compression.   The middle 2?  (2/3)

And is the Weber side draft or down draft?

Distributor?   Or coil pack? (not sure what was used when on the later cars)

I'm interested to see any other thoughts, as I'm starting to get into my vintage racer and need to decide which way to go.   It's a genuine Mk I with a 1275S drivetrain, well, 3/4 of an S drivetrain as #1 piston is melted. 

It was fun on the street (had it registered/insured )and autocrossed it the same season I was vintage racing.   

So now the question is how much tamer can I make it and not kick myself for the loss of go?   


Cheers,

Jim
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Wings
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« Reply #4 on: April 01, 2013, 09:47:36 AM »

I'll have to check with Will to find out which cylinders are down on compression.
The Weber is a side draft but I'm not sure if it's a 40 DCOE or a 45. It's got a distributor.

I met a guy at Cars & Coffee a few months ago who owned a '66 MINI and a '66 Olds Toronado. (They matched the cars featured on the cover of Road and Track comparing the only two front wheel drive cars sold in the US that year.) Anyway... he mentioned that he won the autocross event at the Goodguys' Nationals event at TMS the previous year. Later he had the engine rebuilt and was surprised how much power he had been missing. I believe he said someone in Denton did the motor for him. Perhaps someone here knows which shop that might be.

Paul
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2013 JCW Chili Red/Chili Red
1991 Mini Cooper Red/White 'Matchbox'
THolt
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« Reply #5 on: May 25, 2013, 09:39:53 AM »

I don't know what shop it is but, I am looking for the same information. Picked up a 1275, thanks to Angel for the tip, now I need to get it rebuilt. We plan on doing most of the work ourselves but, still need to get the cylinders checked stuff like that done first.
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Wings
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« Reply #6 on: March 08, 2019, 01:08:21 PM »

I'm reviving an old thread, one I started five or six years ago. I took my Mini up to the shop in Lewisville that i've used since i bought my Mini. The car had a noise that I was guessing was a bad front wheel bearing. It turns out the shop is no longer doing any mechanical work so they assigned it to the guys next door, a place called AutoScience.

Long story short the confirmed the wheel bearing issue but also pointed out some other 'issues'. They tell me the Weber needs a rebuild, the master cylinder is leaking and the radiator has a tiny leak too. They also retested the compression which I've known to be an issue and found one cylinder reads only 25 pounds. i'm driving a three cylinder Mini.  Roll Eyes

Since this isn't a Mini shop I'm hesitant to turn the big stuff over to them. I told them to proceed with the bearing while they work on estimates for the rest of the work. In the meantime I'm wondering what you guys might suggest. Any thoughts or ideas are appreciated.

Paul
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2013 JCW Chili Red/Chili Red
1991 Mini Cooper Red/White 'Matchbox'
BritBits
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« Reply #7 on: March 08, 2019, 08:38:15 PM »

Hi Paul,

Low compression is either blown/failing head gasket, valve sticking open slightly or worn rings, or a combination of those things.  Pulling the head for a head rebuild (or getting a new/rebuilt replacement head) will hopefully cover gasket and valve issues, and you can look at the pistons/cylinder bores while you're there.   The hardest part on the older Minis is getting the intake/exhaust disconnected, not sure how much extra hoses/piping you have on your vintage.


Cheers,

Jim
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Wings
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« Reply #8 on: March 12, 2019, 10:16:27 AM »

Hi Jim,

LOL  Well, you probably have a better idea than I do on what it has or doesn't have. I'm pretty sure it's a 1991 but beyond that I'm pretty much clueless.
I will say the engine doesn't smoke at all so my guess is the rings & cylinders are in reasonable. shape. Oil consumption doesn't give much clue because it probably leaks more than it burns. I've been told the gasket between the engine and the transmission is the source of the leak.
I need to call the shop again today; they have failed completely when it comes to communication. I'm hoping they've got the wheel bearing issue taken care of so I can pick the car up and go elsewhere.

Paul
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2013 JCW Chili Red/Chili Red
1991 Mini Cooper Red/White 'Matchbox'
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