- Local time
- 10:15 PM
- Jan 5, 2020
- Kelowna BC
A little porting helped it, but it's pitiful.3rd tank of fuel on the TDR moto cylinder with the zero blowdown porting...
Green line is the stock untouched CDH cylinder (open transfer)
Blue line is the stock untouched TRD moto cylinder
Brown is with the exhaust port raised 3mm and widened 4mm.
I suspect the transfers are just too high, not so much the exhaust roof being too low. I could shim the base, deck the top and port it further... If I keep raising the exhaust port It'll have nothing down low. I think I'll just melt this cylinder down and turn it into something useful.
Thing is, this TDR cylinder was AUD$18. The CDH cylinder was AUD$28. In this case, the $10 saving is not worth the 2.5HP drop in power and top speed.
That's 3 for 3. TDR snake exhaust, cylinder and piston, all not worth the gamble.