Street Ryderz
Well-Known Member
I have a few of these 48mm bore ceramic coated rather than chromed cylinder's and as usual checked them out before going ahead and correcting transfers and porting them.They are very nice straight and even casting's,port timings are a little weird but fixable,here is what I found!
With a 38 mm stroke short rod the port timings are,133 exh,101.5 transfers,16.02 blowdown,127 intake this was suprising to me as the transfres are at 33mm below the deck and exh is 29 .With 38mm stroke long rod the timings are 132.99 exh,101.01 transfer,15.99 blowdown,127.55 intake.With 40mm stroke short rod they are 144.2 exh,116.06 transfer,14.06 blowdown,123.04 intake.With 40mm long rod they are 143.59 exh,115.46 transfer,14.07 blowdown,123.53 intake.
With a 38 mm stroke short rod the port timings are,133 exh,101.5 transfers,16.02 blowdown,127 intake this was suprising to me as the transfres are at 33mm below the deck and exh is 29 .With 38mm stroke long rod the timings are 132.99 exh,101.01 transfer,15.99 blowdown,127.55 intake.With 40mm stroke short rod they are 144.2 exh,116.06 transfer,14.06 blowdown,123.04 intake.With 40mm long rod they are 143.59 exh,115.46 transfer,14.07 blowdown,123.53 intake.