Jet Size increase for ma3 on o300 with High Comp Pistons.
Posted: Thu Oct 19, 2023 5:18 pm
Hello all,
Working on an experimental o300 engine. I am planning on dropping in a set of combustion technologies 9.5-1 pistons along with a port and polish. Curious if anyone has experience with that size the main jet on the ma3 would need to be drilled to accommodate this? The other option is replace the ma3 with an ma4 and make an adapter plate. Reading online however it seems the ventures on the ma3 and ma4 are the same which begs the question, does the ma4 actually flow more air due to the smallest cross section in the bore being the same as the smaller carb in general?
Working on an experimental o300 engine. I am planning on dropping in a set of combustion technologies 9.5-1 pistons along with a port and polish. Curious if anyone has experience with that size the main jet on the ma3 would need to be drilled to accommodate this? The other option is replace the ma3 with an ma4 and make an adapter plate. Reading online however it seems the ventures on the ma3 and ma4 are the same which begs the question, does the ma4 actually flow more air due to the smallest cross section in the bore being the same as the smaller carb in general?