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Old 04-22-2012, 03:57 AM   #1
Baz
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Default Required fuel for oversized pistons?

93 1.6, Wiseco Pistons, Eagle Rods, MS DIYPNP.

I have just had my bottom end built with oversized pistons (K554M785 Bore:78.50mm (+0.020 Bore) Compression Ratio: 8.5:1) and Eagle Rods.

As the cylinders have been re-bored will I need to change the required fuel in MS? I would imagine several on here have used the above set up so if I do need to change the req fuel I would be grateful if someone could tell me what it should be as I have no idea how to work it out
Barry
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Old 04-22-2012, 08:30 AM   #2
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Increase req fuel by the same percentage that you have increased capacity.

That wont be perfect, infact most likely a little too much but when you do the calculation and find you have increased capacity by like 2% you will realize how little req fuel will need changing.

Dann
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Old 04-22-2012, 12:24 PM   #3
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The stock displacement is 1,598cc, with a bore of 78mm

With your 78.5mm pistons, the displacement is now 1,618cc, an increase of 1%.

So either:

A: multiply your Req_Fuel value by 1.01, or

B: Forget about it. This is a trivial change.
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Old 04-22-2012, 01:14 PM   #4
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Thanks guys, I will leave it as is

Barry
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