OST-030: a case in point

[oldeskewltoy]

from another forum Wrote:If all else remains the same and assuming the bore of the head gasket is 1mm larger than the cylinder bore then you need a volume of 37cc.

I should have had you answer these other responses

from another forum Wrote:Without checking it..

stroke volume is 3.14x41x41x77=369.5
piston sticks up 3.14x41.41.0.3=1.6
gasket is 3.14x41x41x1.3=6.86

Let X be the head volume.

So the BDC volume is
369.5+6.86+X-1.6-3.2 which is 371.56 + X

The TDC volume is
X +6.86 -1.6-3.2 which is X + 2.06

For an 11.3 to one CR
BDC volume = 11.3(TDC volume)
371.56 + X = 11.3(X + 2.06)
371.56 + X = 11.3X + 23.28
371.56-23.28 = 11.3X - X
348.28 = 10.3X
so X = 34.83


..and can I have 25minutes of my life back please!

from another forum Wrote:oh, and account for the gasket too. so chamber volume will need to be

so swept volume is 406638.3mm^3

so your desired theoretical chamber volume will be 35985.7mm^3, just add or subtract the various volumes from this, no? is the "dome" of the piston convex or concave?

As to the chamber volume I'll need... I find to save time, and poor calculating skills on my part - I use one of the online compression calculators..... https://www.rbracing-rsr.com/compstaticcalc.html or http://www.csgnetwork.com/compcalc.html

either of these work.....


in both cases we come up with about 37cc (37.3 in the RB racing calculator)