how to mod the g231 pum

high there scott. can i use your 260 mods on my 231 or is there other tricks on the 231? thanks. john

For the most part you can, tho some issues of entry angles and port sizes must be watched.

* With the smaller bore diameter, INTAKE port cannot be widened as far.
*Eye brow mod of intake side transfer windows can be a tad larger,
as can the edge of transfer passage near exhaust port.

Just watch your port shapes maintaining equal size and flow entry angles.
** Bigger the transfer area gets relative too displacement, slower the outflow of gas's becomes .... so accuracy is paramount !!

Keep Transfer duration stock .... Exhaust @ 178/182 .... Intake @ 156/158
Short pipe of smaller volume and prop down to allow the rpm to get up near 18K ..... Rock the pond :drinks:

Scott

thanks i will tackle this project with care :laugh:
john :diablo:

hi scott. do i have to turn down the piston on the 231 aswell

visvoet wrote: hi scott. do i have to turn down the piston on the 231 as well

Have run them unturned without issue, But .... do it anyways because it does not hurt anything either.