Slow burn project- T1 Speeduino EFI

[Bruce.m]

Work in progress and when I’ve got spare time.
Engine it’s going on is basic, near stock build to use as a test bed and also as a future backup motor when I get round to the fun engine.

Will use cable linkage.

[Bruce.m]

[Bruce.m]

Stainless steel inserts, cut from DIN spec tubing

[Bruce.m]

Pair of NOS type3 injection manifold phenolic insulation gaskets.

[Bruce.m]

Test fit of the throttle body on its stock rubber boots.

[V8Nate]

Looking good nice work! Is it safe to assume you printed those intakes or are they cast? What is the deal with the slow burn?

[Bad Bob]

Nice compact throttle bodies. What size? The manifolds look great too!

[Bruce.m]

Manifolds are indeed 3D printed. Made with Nylon / carbon fibre filament. Using the NOS insulation gaskets to keep the heat transfer to an acceptable level, given aircooled heads run hotter than watercooled.

Throttle bodies are modest Honda items at around 30mm bore. They are available in a few sizes up from that but it’s a stock cam, 1641 with mild port heads.

[Bruce.m]

“Slow burn” cause its not going to happen over a couple of weekends

Parts for the speeduino ECU have been ordered.
I also have the Honda bike harness so I can reuse all the plugs and wiring to make a harness. Much cheaper than sourcing the plugs, pins, wire individually.

[Bruce.m]

2nd manifold now printed & test fitted.

[Bruce.m]

Some bits arrived.

ECU kit (NO2C speeduino)




The coil pack. Usual VAG 106b/e smart coil, from NGK in this case.

[Bruce.m]

ECU is mostly assembled. I ran out of solder so a few header pins to add. Also waiting for a DIP socket to mount the coil driver IC. Apparently the 106b coil is a bit hungry for current, if it’s got the original style ignition module circuit. So there is a risk that IC will need changed at some point if I get unlucky, so a DIP socket seems a wise precaution.

[Bruce.m]

Bit more CAD work. Need a pulley for one of the throttle bodies.

[Bruce.m]

Also…. Side note.
Before I picked up the bike throttle bodies, I had planned a single throttle body with plenums on each side. Tricky to design though, with my limited hours in CAD. May return to it at a later date.

[Bruce.m]