Thinking ahead to an 8v Megasquirt project I'll have a choice of inlet manifolds : mk1/Scirocco 1.6/1.8 mk2 Golf K-jet mk2 Golf Digifant mk3 Golf 2E Does anyone the relative merits of either design? Any advice much appreciated. Cheers
What sort of engine spec were you thinking of, Mr B? The inlet ports are different shapes, so you could only use a 2E manifold if you're using a Mk3 Type head. If you're using a Mk1/2 head then you're limited to one of the first three. If you're using digifant type electronic injectors, then it's probably easier to use a PB manifold, although it might depend what it's going in, for clearance under the bonnet. I don't think it'll make much difference to the flow through the head. I doubt very much if the manifold is the bottleneck, although it's not exactly a neat design... The man in the shed will flow one out for you (about 40 + VAT the last time I asked, for a PB one - other types would probably be the same), although he's said he doesn't think it makes a lot of difference, unless you're going for a big spec and need every last ounce of airflow.
Cheers Mike, forgot about that extra bit on the mk3 inlet ports. Digi it is then lol. @Henry - carbs gotta go..
where can you buy those honing tools that people use to port the inlets? or are they home made? anyone got any pics?
Whats up with the carbs ? I think both the MK2 manifold flow quite well, the port runners a much bigger than a MK1 manifold. If yr going down the mapped injection route how about bike t/b's or DCOE type t/b's. The sale ofthe carbs would go a fair way towards the price.
No vacuum for the servo and I don't really want to spend 100s on a proper servo-less set-up. Hopefully the money for the carbs will cover the cost of the MS and other bits I need. ITBs on an 8v though? It's an idea.....
Are you going to upgrade any of the engine (head, cam, etc). If not, is there really much point in doing all the megasquirt work?
Grindstones on a dremel, or electric drill with flexi shaft. Then flap wheels to finish it off I'd think.
cool cheers, i've got an old honing tool i could use and on of those flexi-shaft things from a socket set
So a standard mk2 manifold is better than a Mk1 , one? Cos I was looking at mine and the casting is awful , rough as a bears ars3 tbh .
Ahh... thats easy, run without the servo and push harder on the brakes ! Seriously though, it is ok to run without a servo, I dont use one and have no probs on road or track, even with comp type pads from cold. In fact, I hardly noticed the loss. The other way is to remove the manifold and drill & tap for a fitting to attach the servo hose. If you did run t/b's you'd still have to do this anyway if you really wanted servo brakes.
What, your MK1 or MK2 manifold ? The runners on a Mk2 manifold are a bit bigger, the only prob when running std type injection is the throttle body sits at the other end of the plenum, so you'd have to move all the injection over to the other side of the engine bay. If you were starting from scratch with a different stand alone type injection set up (like Megasquirt) then that would'nt be a problem.
Been done. I've been told that the head characteristics (solid lifters, mad cam etc) mean that there's not enough vacuum.
