Skimmed 12G940 on 1098.

Side valve, 803, 948, 1098., 1275 and Vizard mods

Re: Skimmed 12G940 on 1098.

Postby Monty-4 » Fri Apr 22, 2016 8:58 pm

It might be and don't call me Shirley, etc. etc.

Perhaps I'm misunderstanding something - I could swear my workshop manual said the cooled water flows out of the bottom of the rad. The metal pipe that is held down with some of the head nuts comes off that. Hence cold water no?
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Re: Skimmed 12G940 on 1098.

Postby Panky » Fri Apr 22, 2016 10:29 pm

I'll call you what ever I like :D
I thought you said you were going to use the feed to the heater which comes off the back of the head. But if the feed you're going to use comes off the bottom of the rad then yes, a lot cooler than off the head so happy days.
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Re: Skimmed 12G940 on 1098.

Postby Monty-4 » Sat Apr 23, 2016 12:18 pm

Oh and I've hooked up both breathers to the carb with a T-piece. Very odd not to leave a trail of oil everywhere I go now, how will I find me way home if I get lost?!
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Re: Skimmed 12G940 on 1098.

Postby Panky » Sat Apr 23, 2016 2:13 pm

Result with the breathers :)
Just been re-reading your posts, if you take the heater out of service to use the connections solely for the oil cooler then you will be putting hot water through the cooler. But if you leave the heater in place and pipe the cooler up from the heater outlet then onto the return to the bottom of the rad then the coolant will be a few degrees cooler because the heater will have lowered the temperature - if you catch my drift.
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Re: Skimmed 12G940 on 1098.

Postby bmcecosse » Sat Apr 23, 2016 3:24 pm

The water at the base of the radiator is cold - and is on it's way to being sucked into the water pump - to be heated as it pumps round the hot engine. So - although I don't see an easy way to do it - it would be the 'best' water to run through the oil cooler. However - the oil does tend to run hotter than the water - so I suppose if you run a 74 deg thermostat and use the heater tap - that water will be slightly cooler than the oil. One reason it was used on the Metro Turbo was to heat (ie thin) the oil more quickly - so it could lubricate the turbo more quickly. An air/oil cooler is much the preferred option.
 









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Re: Skimmed 12G940 on 1098.

Postby Monty-4 » Wed Apr 27, 2016 11:01 am

Cool (pun intended).

Just out of curiosity - I'm trying to work out the exact compression ratio using one of the tools available online. Drawing a couple of blanks:

Bore: 2.5425"
Stroke: 3.296"
Chamber Vol: assuming ~21.4cc (I need to re-measure this more accurately)
Head Gasket: 0.0334"
Head Gasket Bore: ?? (Edit: I make this 2.9015" long-ways.)
Piston to Deck Height: ?? (Edit: is this zero? I remember the edge of the pistons appearing to be flush at TDC when I had the head off.)
Piston: dished 6.9cc
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Re: Skimmed 12G940 on 1098.

Postby Monty-4 » Mon Jun 13, 2016 9:48 pm

Quick aside - finally discovered the tapping sound. Was immediately obvious when I took the head off over the weekend.

Combine the following; tight clearances, analogue calipers, a hint of carbon and a newbie enthusiast getting already worn-in valves swapped around. What do you get? Valve hammering. There is a nice partial moon outline on the block, I couldn't feel or measure an indentation but the noise is gone now I've swapped the valves around and ground them in again.

Live and learn... and a lucky escape perhaps.
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Re: Skimmed 12G940 on 1098.

Postby Panky » Mon Jun 13, 2016 10:39 pm

Close call :shock:
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