[A2 VW]

Does a thicker headgasket increase or decrease compression ratio? I'm thinking since it's gonna be taller, it's gonna increase stroke and increase cr. Someone tell me if I am right and if not, let me know. Thanks.

 

[john s]

Re: Compression ratio... (A2 VW)

Stroke is determined by crankshaft throw, you're increasing combustion chamber volume (decreasing CR).

 

[sandusky]

Re: Compression ratio... (A2 VW)

if you have a thicker head gasket, you will increase the size of your combustion chamber. Your stroke won't change unless you have a longer connecting rod or a different crank (or taller piston). So since the stroke is the same and the combustion chamber is larger, you will have a lower compression ratio..

 

[StevenH]

Re: Compression ratio... (sandusky)

I'm probably wrong, but I don't think a taller piston would increase stroke. I understand the piston would end up higher, but wouldn't the fact that its lowest point is also raised and it just cancels out the increase up top leave you with the same stroke as before? It seems to me that a taller piston would increase the the compression by reducing the area in the combustion chamber when its all the way up. I probably wrong so don't flame me, just curious to how it works. Thanks


[Modified by StevenH, 2:53 PM 2-13-2002]

 

[A2 VW]

Re: Compression ratio... (StevenH)

Yes, StevenH you're right. I was thinking about something else, thanks all.

 

[RangerFred]

Re: Compression ratio... (StevenH)

From what i thought, the height of the psiton doesn't determine the compression ratio, but it all relies on what's on of the top of the piston itself. ie: shape of the psiton (dome, flattop) and the valve reliefs (size, shape, and amount of reliefs)