yamaha_nisse
New member
Hi,
Was going to buy some new domes for my PP head. Started to calculate the compression ratio.
But it all turned up wrong.
Turning up having a 7:1 ratio and ~500cc total.
Anyone in here know the correct Stroke..? From BDC top TDC.
Thanks Rasmus
Was going to buy some new domes for my PP head. Started to calculate the compression ratio.
But it all turned up wrong.
Turning up having a 7:1 ratio and ~500cc total.
Anyone in here know the correct Stroke..? From BDC top TDC.
Thanks Rasmus
Last edited:
jabber800
New member
59.6mm
yamaha_nisse
New member
So..
59.6 / 2 = 29.8 ~ 30mm
3*3*3.14*7 = ~198 + 23cc (std dome with sharkplug)
221ccm per cylinder..?
221*3 = 663ccm..? Should be 698ccm
Were have I got it wrong..?
But if I dived 698ccm / 3 ~ 232.5ccm
That give me a ratio of 10:1 on STD domes.
Change 'em for example to 26ccm... Gives me 8.9:1 in ratio.
Should that be enough on 8PSI of boost..?
59.6 / 2 = 29.8 ~ 30mm
3*3*3.14*7 = ~198 + 23cc (std dome with sharkplug)
221ccm per cylinder..?
221*3 = 663ccm..? Should be 698ccm
Were have I got it wrong..?
But if I dived 698ccm / 3 ~ 232.5ccm
That give me a ratio of 10:1 on STD domes.
Change 'em for example to 26ccm... Gives me 8.9:1 in ratio.
Should that be enough on 8PSI of boost..?
jabber800
New member
Try this site to help out with cylinder volume and copression ratios.. Go to helpfull automatic calculators.. These are great!! Have helped me with many projects..
www.wiseco.com/Calculators.aspx
Dan J.
www.wiseco.com/Calculators.aspx
Dan J.