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Author Altering Stroke Longer/Shorter (C20XE)
Filby1
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Registered: 12th Dec 03
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3rd Jun 05 at 10:18   View User's Profile U2U Member Reply With Quote

What difference would you get in putting: i mean longer than standard and then shorter than standard?

A: Longer Con Rods

B: Shorter Con Rods


[Edited on 03-06-2005 by Filby1]
AK
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Registered: 5th Jul 00
Location: Aberdeen City
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3rd Jun 05 at 11:05   View User's Profile U2U Member Reply With Quote

i think you'd want to alter the crank....

longer/shorter is same crank wont do much as the piston is going to move linearly up or down

i.e.... if you lengthen a rod, it wont stroke down as far, but will stroke higher

AK
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3rd Jun 05 at 11:05   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Adam Kindness
i think you'd want to alter the crank....

longer/shorter with same crank wont do much as the piston is going to move linearly up or down

i.e.... if you lengthen a rod, it wont stroke down as far, but will stroke higher


CorsAsh
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Registered: 19th Apr 02
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3rd Jun 05 at 11:23   View User's Profile U2U Member Reply With Quote

If you put shorter ones in, would you get low compression?
Siberia
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Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
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3rd Jun 05 at 11:34   View User's Profile U2U Member Reply With Quote

what affect does doing this have anyways?
ed
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Registered: 10th Sep 03
Location: Northampton Drives: Fiat 500/Porsche Boxster
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3rd Jun 05 at 11:56   View User's Profile U2U Member Reply With Quote

To change the stroke on an XE you can put on a 2.2 Ecotec crankshaft, that will increase the displacement to something like 2198cc, could then bore out the block to get it to about 2250-2300cc at a guess... Don't think changind the con-rods would do anything usefull though.
AK
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3rd Jun 05 at 13:35   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Siberia
what affect does doing this have anyways?


as ed says.....

lets you get more air/fuel into the cylinder
Siberia
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Registered: 9th Oct 03
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3rd Jun 05 at 13:49   View User's Profile U2U Member Reply With Quote

but when the piston gets to TDC would it not be sticking to high... and clattering the valves? interest concept though...
ed
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Registered: 10th Sep 03
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3rd Jun 05 at 14:17   View User's Profile U2U Member Reply With Quote

Think you need the 2.2 con-rods too acutally which are proably a bit shorter... Basically you are making the piston move down furthter into the bore.
Joff
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Registered: 17th Oct 00
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3rd Jun 05 at 14:55   View User's Profile U2U Member Reply With Quote

2.2 conrods too... I think I saw somewhere in the US that manufactured them
Siberia
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3rd Jun 05 at 15:00   View User's Profile U2U Member Reply With Quote

you would loose some compression yeah?
ed
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Registered: 10th Sep 03
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3rd Jun 05 at 20:58   View User's Profile U2U Member Reply With Quote

No because the piston is still able to move to the fully upper most position at the top of the bore. The engine code for the 2.2 engine is X22XE so it uses the same compression ratio of 10.0-11.5 : 1...

But, now I'm slightly confused about it too

[Edited on 03-06-2005 by 1800ed]
Robin
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Registered: 7th Jan 04
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3rd Jun 05 at 21:59   View Garage View User's Profile U2U Member Reply With Quote

shorter rod would make the piston drop lower in the bore on the down stroke, but wouldnt get as close to the head on the upward stroke, so compression ratio would be lower, as the volume of the space when the piston is TDC is bigger

longer rod would not go as low in the bore on down stroke, but would be closer to head on upward stroke, raising the compression ratio (TDC piston volume lower), IF... it didnt his the face of the head, which it probably would

 
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