Quagmire Posted March 21, 2011 Share Posted March 21, 2011 Right, Moving from Megajolt to full Megasquirt has been on my mind more and more recently now that we have been getting decent amounts of daylight. So I have complete 3.5 Flapper setup sitting in Dad's garage, manifold, fuel rail + injectors, oily plenum, pipework, bits of loom- everything. I have cleaned the injectors, replaced pintle caps and filter baskets etc so these should (hopefully) be spot on now. However, I also have a rather blinging later plenum from a 4.6 that is corrosion free and nice and shiny inside and out. Question is therefore, can I use the flapper manifold + injectors etc, with the nice shiny 4.6 plenum on top? From reading the MS thread I think that there are issues with MS 1 and the idle air valve on the later plenum (stepper?), but am thinking I could perhaps live without it, or keep it open and then control airflow externally via MS and another valve (the Bosch one used on Volvos, SAABs etc?) All answers greatfully accepted. Oh yes, and if the 4.6 plenum will fit then I shall be getting the "4.6" milled off so I don't get confused and forget I have a 3.5... Thanks Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted March 22, 2011 Share Posted March 22, 2011 The 4.6 plenum has a few other plumbing oddities (I had one too, never bothered with it because of this). As you say, using the PWM air valve is the way forward for idle control but that's not the only thing to look at, I'd hold it up next to your current one and play spot the difference. Quote Link to comment Share on other sites More sharing options...
Quagmire Posted March 23, 2011 Author Share Posted March 23, 2011 Cheers Fridge, will do a stare and compare next time I'm at my parents house. Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted March 23, 2011 Share Posted March 23, 2011 I have done the above for a customer What I did was mill the back of the 4.6 flat, then frilled the hole in the unit for ait in, took a plate and pipe (triangle shaped) off the back of a 3.9 and then fitted it via a home made gasket and 3 x drilled and taped m8 bolots which then hold it it the correct position The plumbing is a tad different, some need to be blocked off, and other bits connected up using a 3.5 / 3.9 you can easily work which are which I didn't machine off the 4.6 as matey was desperate to show it was The bolts (allen Bolts) that hold the polenum to th trumpet are the same, but shorter - if that makes sense, otherwise yes it fits Hiope this helps - on and he is having it polished But it is a kit car Nige Quote Link to comment Share on other sites More sharing options...
Quagmire Posted March 24, 2011 Author Share Posted March 24, 2011 Thanks Nige- mean't to say the EDIS HT ends I got off you were spot on- the 90 is now running like a dream on its new homemade leads Quote Link to comment Share on other sites More sharing options...
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