Distance between crank sensor and crankshaft. - Alfa Romeo Forum
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Distance between crank sensor and crankshaft.

I'm on my way to build 2.0 engine for track purposes, using engine block from 1.8TS honed to 2.0 size, pistons and crankshaft also from 2.0TS. This combo is 15kg's lighter than standart 2.0, and when on track every kg counts.
Problem is that with 2.0, crank position sensor touches crank's tooth - and i need to know how far from the crank this sensor sits in order to do some spacer for it. 1-2-3-4 mm?????
Anybody knows correct figures???
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Can you use the toothed wheel from a 1.8 on the 2.0 crank?
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I would guess that the sensor needs to be as close as you can get it, without it touching.

Obviously you have to allow for a bit of thermal expansion, so I would go for 1-2mm


If the car doesn't run then the sensor is too far away.
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Quote:
Originally Posted by David C View Post
Can you use the toothed wheel from a 1.8 on the 2.0 crank?
Yea, i thought that will be less hassle, but 2.0 cranck "balance plate" is aprox 1mm near to toothed wheel, and no matter how small 1.8 wheel will be(don't even know if it can fit 2.0 cause crank balance piece is bit bigger), i need at least 2-3mm's tolerance still.
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Why not fit the 1.8 crankshaft?

I've got some detailed Alfa engine specs that might help you if you PM me your email address...
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Quote:
Originally Posted by iainfm View Post
Why not fit the 1.8 crankshaft?
The 2.0 has a 91mm stroke
The 1.8 has a 82.7mm stroke.

A 2.0 bore with a 1.8 crank would only be 1790cc, so still a 1.8...
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Quote:
Originally Posted by David C View Post
The 2.0 has a 91mm stroke
The 1.8 has a 82.7mm stroke.

A 2.0 bore with a 1.8 crank would only be 1790cc, so still a 1.8...
Fairy snuff. Hadn't realised the stroke was that different!

And was too lazy to check!
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