Author Topic: Racer Resurrection  (Read 58233 times)

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Offline bsracer

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Re: Racer Resurrection
« Reply #180 on: June 08, 2018, 11:42:53 AM »
Check the squish clearance. You don't want it too tight. I think the heads I have on now are at 8cc.


paul

Offline al_pritchard

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Re: Racer Resurrection
« Reply #181 on: June 11, 2018, 01:20:41 PM »
I dont think I'll have any clearance issues, if anything the "squish" area is non-existent. With no base gasket or shim, and no head gasket I get a 1mm squish at the edge of the piston. Raising to 1.9mm squish, 5mm out. This is probably +/- a little, it was difficult to accurately measure the edge of the solder.


No Shim, No Gasket
Base Shim: N/A
Cylinder Bore: 50mm
Engine Stroke: 45mm
Exhaust Port Height from TDC: 26mm
Exhaust Closes at: 90° BTDC
Cylinder Volume at BDC: 90.13cc
Cylinder Volume at TDC: 7.1cc

Squish:
At Cylinder Wall: 1mm
5mm From Cylinder Wall: 1.9mm

Uncorrected Compression Ratio: 13.45:1
Trapped Compression Ratio: 8.19:1


Small Shim, No Gasket
Base Shim: 0.61mm
Cylinder Bore: 50mm
Engine Stroke: 45mm
Exhaust Port Height from TDC: 26mm
Exhaust Closes at: 88° BTDC
Cylinder Volume at BDC: 90.13cc
Cylinder Volume at TDC: 7.5cc

Squish:
At Cylinder Wall: 1.61mm
5mm From Cylinder Wall: 2.51mm

Uncorrected Compression Ratio: 12.78:1
Trapped Compression Ratio: 7.81:1


Medium Shim, No Gasket
Base Shim: 0.80mm
Cylinder Bore: 50mm
Engine Stroke: 45mm
Exhaust Port Height from TDC: 26mm
Exhaust Closes at: 86° BTDC
Cylinder Volume at BDC: 90.13cc
Cylinder Volume at TDC: 7.8cc

Squish:
At Cylinder Wall: 1.8mm
5mm From Cylinder Wall: 2.7mm

Uncorrected Compression Ratio: 12.33:1
Trapped Compression Ratio: 7.54:1


Thick Shim, No Gasket
Base Shim:
Cylinder Bore:
Engine Stroke:
Exhaust Port Height from TDC:
Exhaust Closes at:
Cylinder Volume at BDC:
Cylinder Volume at TDC:

Squish:
At Cylinder Wall:
5mm From Cylinder Wall:

Uncorrected Compression Ratio:
Trapped Compression Ratio:


Al Pritchard
Highlands, NJ

BS175 Racer

 


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