Engine just before removal (with twin Dellorto DRLA40s and Mallory ignition). Very untidy wiring - installing EFI will give me the kick to install the wiring neatly after temporarily fitting it 3 years ago!
Here is the crank trigger a wheel a friend designed and had laser cut for me. The missing tooth is still present, once I have fitted the crank trigger sensor.
I will use Alfa Romeo 145 1.7 16V boxer throttle bodies. These have 40mm bore at the top, but are of an oval shape at the bottom.
The friend that designed the crank trigger is making me the flanges for the head and the throttle bodies.
Q. Hi, I'll follow your setup, I'm also a vw enthusiast. I had heard about throttle bodies from alfa engin, but I was told that they had the idf pattern on the bottom. That's why I also picked up one of those 16v engin equipped with oval-shaped bodies, and seeing this disappointed me. I'm curious to see if you can get hp from those with custom manifolds. Did you dyno the engin before evolution? -could be pretty interesting. Nicolas
A.
I had the engine dynoed a while ago, but due to finding poor quality head work (by a professional - one of the only things I have paid good money to have done..) the engine has been stripped down to be stroked (2145 - 74x96) and have the heads rebuilt to a better spec.
Tue23Jan
Hello guys
I'm attempting my first type 4 build and I'm using Ducati 748 916( Weber ) throttle bodies. Complete with TPS linkage and injectors £25 a pair on E-Bay. They are about 45 mm choke size. There is a version that appears from time to time with dual injectors which is off the later bikes. The current system is very tasty and uses upstream injectors firing straight into the TB. They have appeared on E-Bay at about £50 a pair. The spacing is such that IDA manifolds are needed as the TBs are handed and open opposite to each other and the injectors make them separate too wide for IDF manifolds. ( You'll see what I mean if you examine a pair )
Mike
Hello Mike, I'll try to locate the weber TBs you are talking about, they seem pretty interesting, mostly because of dual injector. You meant 2 injectors for one cylindre, didn't you?
Do you have specs of your T4?
Wed 24 Jan
If you have a My Ebay page go to search and key in ducati throttle bodies. There are no dual injector ones on offer at the moment but they come up from time to time. I bought a pair for £20 but they can go to silly money - the last ones I saw went to £102 for the pair. I don't think they are really necessary as the single injector version is good for more than 50bhp per cylinder in the bike. Make sure that any you bid for still have the bell mouths as well, some people tend to sell these separately. The TBs can be attached to an IDA manifold using a mounting plate about 10-12mm thick. The TBs plug into holes and locate with O rings.
My engine is still at the parts gathering stage but it is to be 78X100 ( 2450cc, Porsche barrels ) JE flat tops, Engines plus twin plug COP heads with 11.5 CR, Webcam 86C, dry sump. Loadsa poke - I hope !!
Mike