Basically i'm looking into doing a bike throttle bodies conversion on my HPE. I've got an idea on how to do it and what will need modifying from the standard bosch fuel injection system but no idea on what and where I can get specific parts and who can make them.
Things I can think of atm....
What bodies do people recommend? Bore size? From what bike?
Will the bike injectors be upto the job supplying the amount of fuel required?
Can the TPS from the bike be used?
What management system do people recommend? DTA?
Like so many people i'm on a tight budget hence bike bodies over something like jenveys, so bare that in mind.
Thats all for now, suggestions please....
A lot of my questions have been answered kindly by Eric (WestonE) a few months ago.... read below, but feel free to chip in with suggestions and idea's, the saving a few quid one's I find the best
"I run a Montecarlo on Jenvey Throttle bodies, Wasted Spark (no Distributor) Ignition and Emerald K3 ECU. It is extensively modified and revs to 8500 rpm in one long surge producing 200bhp. For your situation I would suggest MegaSquirt as an ECU and using throttle bodies from a motorbike with 36- 40mm bore sizes. People like Bogg Brothers can build you a manifold cheaply and tell you where to get the throttle bodies. You will need a new 36-1 crank trigger to get a high enough data rate for the ECU ( I use a wheel from Trigger wheels.com fitted to a VX pulley). You will use a throttle position sensor and throw away the horribly restrictive flap meter from the standard set up. NB just changing this to a hot wire meter might give you a real gain with the standard set up.
Buy the Haynes Engine Management book written by Dave Walker from Emerald and read with care. You can source a wasted spark coil pack and HT leads from a Scrap Mondeo/ Focus/ Fiesta. With no other engine mods you can expect 165BHP smooth progression throughout the rev range and great throttle response provided you do not fit overly large throttle bodies i.e. 36 might be better than 40mm with no other engine mods i.e. raised compression ratio, higher lift longer duration cams, a flowed head and tubular 4 into 2 into 1 manifold. In my opinion the mappped ignition is far more important than the injection and you may need a new injection pump and a higher line pressure (adjustable) to get the injectors to work with your new set up.
I have seen complete Emerald and Jenvey kits for £1500 in Kit Car magazines and that is where to look for advice on building an injection system. Whilst I assembled the unit Guy Croft did the crank prep and head work. There are pictures on the Monte Consortium Web Site (the old one).
I suggested Bike bodies because a lot of the cost is in the TBs injectors linkage and manifold although the Jenveys are supurb. I love the Emerald K3 but it is overkill for our needs as there are no turbos invloved and a lot of the features like flat shift gear change I have not installed."
