Another week goes by and some small progress. Unfortunately its taking a little longer than hoped to get a daily driver organised, so pulling the engine from my mx5 has been postponed till next week
I spent a fair amount of time yesterday cleaning up and modifying the inlet manifold. I\'ve removed all the extra features from the throttle body that I shant be using with megasquirt, the majority of which being the second throttle plate. I\'ve filled the holes with metal putty then began to smooth it over. Still needs some time with a finer grit sandpaper to really smooth things out.
Similarly I\'ve removed the 5th and 6th port butterflies, filled their holes and smoothed out the casting marks near by. I know this is a controversial thing to do and I\'ll loose midrange, but I fancied going for the simplest engine build I can. I\'ve also read that I shant gain any top end from doing this, only loose mid range, I can see how thats the case with the american style rotating tube that goes into the main housing but the UK style butterflies have got to cause quite a restriction on the 5th and 6th ports. I\'ve got a spare LIM with working actuators, so swapping back is easy enough. Heres a couple of before and after pics.
I\'ve also smoothed out the transition from plenum to intake runners. Again this is just rough at the moment and needs smoothing out more.
In the process of cleaning out the intake runners I broke one of the secondary injector baskets
How important are these? I\'ve got spare ones of the short primary injector style baskets. Could I just use one of those?
I\'m sending the injectors away to be cleaning next week, then I can rebuild the intake system
Fingers crossed next weekend I\'ll be posting pictures of an mx5 with no engine!
p.s. I\'ve also been working on the body work for my motorbike! I\'ll post some pics for the two stroke crew at some point....
p.p.s running out of real work to do + being in garage with tools + spare parts = danger.
Again my friend Ian is the one who ends up looking silly on the internet as I stay safely behind the camera. It felt surprisingly natural to ride....