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measuring engine capacity?
02GF74 - 16/12/05 at 10:28 AM

... without removing the cylinder head.

Can it be done?

The way I can see to do it is to put the piston at TDC of compression stroke so both valves are close and measure volume of petrol to fill it. This give approximate combustion chamber size.

then lower piston about 1/2 way down (there is not position at BDC with both valves closed) and add petrol.

Doulbe the amount of petrol added give cylinder volume. Multiply by 4 gives engine capacity.

Is there another way?

nick205 - 16/12/05 at 10:34 AM

what engine is it? has it been modified?

02GF74 - 16/12/05 at 10:50 AM

quote:
Originally posted by nick205
what engine is it? has it been modified?


it is a kent, block number 711M 6015.

So could be 1300 or 1600 (but looking a lotus block info. that lists 1600).

Dunno if it has been bored out.

not only would it be useful to know but wondering if I could get away with registering it as a 1300 for cheaper road tax (under 1549 cc)

But if the block number means a capacity of 1600 then I won't be able to.

smart51 - 16/12/05 at 10:54 AM

Aren't pistons a bit leaky in their cylinders? For the very short duration of time that air is in the cylinders, they are air tight enough but if you're pouring petrol in, won't it leak into the sump a bit. Piston rings are not a complete circle.

02GF74 - 16/12/05 at 11:09 AM

quote:
Originally posted by smart51
Aren't pistons a bit leaky in their cylinders? For the very short duration of time that air is in the cylinders, they are air tight enough but if you're pouring petrol in, won't it leak into the sump a bit. Piston rings are not a complete circle.


I think I will be able to pour it in faster than it can leak out as petrol is a lot denser than air.

Dunno really, that is why I am asking the quetion.

Dusty - 16/12/05 at 11:16 AM

If you have two pistons at TDC the other two are at BDC. Fill with engine oil rather than petrol and suck it all out after. Might be a bit smokey on startup!

02GF74 - 16/12/05 at 11:27 AM

quote:
Originally posted by Dusty
If you have two pistons at TDC the other two are at BDC. Fill with engine oil rather than petrol and suck it all out after. Might be a bit smokey on startup!


although is more vicsous, using petrol is deliberate since when I turn the engine over it will flow out of the spark plug hole and not leave a mess on the block.

Memphis Twin - 16/12/05 at 11:36 AM

711M 6015BA is 1600 block
711M 6015AA is 1300 block

1600 block ia an inch taller, easily seen where the bellhousing joins to the block- the 1300 has the top edge of the bellhousing almost level with the top of the block. The 1600 is an inch higher.

02GF74 - 16/12/05 at 11:50 AM

quote:
Originally posted by Memphis Twin
711M 6015BA is 1600 block
711M 6015AA is 1300 block

1600 block ia an inch taller, easily seen where the bellhousing joins to the block- the 1300 has the top edge of the bellhousing almost level with the top of the block. The 1600 is an inch higher.


block no is 711M 6015 AA so that makes it 1300

I'm hoping you got the AA/AB the other way round - I think the photo below confirms that.

rear of engine
rear of engine

[Edited on 16/12/05 by 02GF74]

[Edited on 16/12/05 by 02GF74]

Bluemoon - 16/12/05 at 01:07 PM

You could not use air? upturned measuring jug in bucket of water, pipe from zorst outlet to under upturned jug. Turn over buy hand from TBC to TBC, air displased in to jug = capacity?

Just an idea, might not work!

Surrey Dave - 16/12/05 at 01:55 PM

you could measure the stroke with some welding wire, aren't the bore sizes the same on the 1300 and 1600?

gazza285 - 16/12/05 at 03:01 PM

quote:
Originally posted by Memphis Twin
711M 6015BA is 1600 block
711M 6015AA is 1300 block




Not forgetting that the AA block is also used for the 1100.

02GF74 - 16/12/05 at 03:39 PM

quote:
Originally posted by Surrey Dave
you could measure the stroke with some welding wire, aren't the bore sizes the same on the 1300 and 1600?


dunno; butif they are, then that is the easiest way!

paulf - 16/12/05 at 04:24 PM

The bore sizes are the same , I have 1300 pistons in my 1600 block.The picture above is a 1300 engine.
Paul.

quote:
Originally posted by 02GF74
quote:
Originally posted by Surrey Dave
you could measure the stroke with some welding wire, aren't the bore sizes the same on the 1300 and 1600?


dunno; butif they are, then that is the easiest way!