308 V12 conversion begins

It occurred to me while driving to work that I need to re-think a couple things I had in mind. I want to use a QV looking air box and the injectors will need to mount inside of it (ducati went to this system in their newer models). That means there any TB balancing type adjustments must be done with the airbox installed because removing the airbox means removing the fuel injectors and clearly the engine won’t run very well without fuel.

Next is the TB linkage. I was thinking linking the TBs together like the Japanese sport bike TBs…..but that will be a problem too. They get bolt all the TBs together as a set and make up any length error by mounting them in rubber boots. I’m planning to bolt the TBs in place on the heads/manifolds so I can port match them so I can’t bolt the TBs together and I can’t use the sport bike type linkage because there would be no way to split them together.

I’ll need to give this a bit of thought. I’m going to get the manifolds done and flow match a TB to each port and deal with the linkage/airbox design after the engine is assembled. I don’t want to delay the engine assembly and I’ll be a lot more motivated to accept compromises at that point.


The custom PCB board for my 12 MAP sensor set-up shipped today. I have the 12 board mounted MAP sensors but I still need to rest of the bit.....more to do but I think this is going to really help the ECU control the mixture at low power

 

On the top to bolt the TBs to.

I'm thinking down the valley rather than over the cam covers.....out of site.

 

I could, the ecu I got has the servo motor option

 

My new injectors came yesterday. Cute little things,I think I read the 12 hole spray pattern is laser cut, tiny hole however they make them.

I realized I got a little carried away with the band saw yesterday (no way to remove the cam cover issue) so I put that piece back where I found it. I took the ears off a couple TBs that were hitting on the inside (I used a grinder so there is no do0over with this cut )then did a quick mock-up. I think it looks pretty good I'm ready to start putting the runners on tomorrow....and just look at all the space left in the V for 12 more injectors if I decide I need them, the water return line out of the heads and the oil lines for the remote filter (I'm thinking the oil filters aren't going to fit in the V any more).
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I’m on a roll, don’t bother me with details!

There’s no hope for the deck lid I don’t think. I wanted a composite deck lid anyway….

No, I'm over that. I want to see the TBs so I'll have to deal with the idle air vent issue.

 

The board on its way is a prototype. You could order one but I suggest you wait until I assemble it and make sure the parts fit and it works. Once the prototype is tested there will be 2, 4, 6, 8, 10, 12 cyl versions available….which are really just the 12 cyl version chopped down (it’s designed saw a 12 cyl board can be cut to and number). The layout is 6 on top, 6 on the bottom so a 4 cyl version could be made as 2 top/2 bottom for thick and short or or long and thin using the 4 in a row using the 8 cyl version

I attached what I think is the most recent layout and BOM
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No you’re right and we talked about this a bit before. I may not ever need the additional 12 injectors to get the low end performance acceptable so I really don’t want to build and plug knowing the plugs may be permanent.

This morning’s drive to work thought was that maybe for a lot of minor reasons including adding injectors later it would be a mistake to weld the manifolds on. Tonight or tomorrow I’ll take another look at what would be involved in making the manifolds bolt-on…I’m thinking it wouldn’t be as bad as I was thinking and may make life a lot easier down the line

 

I am in the get it done mode now so the compromised will be coming fast and often.


My key knows exactly what he’s doing ecu guy has had a lot of things come up and this computer just hasn’t been a priority…..and a usable ecu is about a year from whenever it is a priority and I’m at the point where that no longer meets my project timeline. I don’t have the budget for 24 injectors worth of motec stuff or even 12 injectors worth…..but I’d rather have the engine running than worry about thinks like brakes so I bought 12 injectors worth of ecu stuff.

 

I’m going to try to get it rolling under its own power before winter…..which I fear probably means next spring.

There is still an awful lot left to do and little thinks can burn up a lot of time. anybody who wants to stop by and help make stuff is welcome......

 

It's a very simple diode circuit. The lowest voltage sensor (highest vacuum - cylinder intake) pulls the common MAP buss voltage down and ECU reads the buss voltage and therefore only sees the signal from the lowest pressure cylinder. Take a look at the schematic I posted