K1100 build - anyone fitted injectors to the head?
Turbo Mini Forums

I'm finally getting around to the bmw head on 1275 block, I have BMW throttle bodies and by putting injectors in the head will have more room up front. But, will I have heat soak problems with the fuel?
Also, is there a K section to this forum?

Edited by Minimutly on 10th Mar, 2025.

My thoughts on the position of the injectors is BMW located them where they are for a good reason.
Re heat soak, I can't see it being any worse than using either of the aftermarket alloy plenum/inlet options.
I personally can't see why you'd need to go to that extreme though, the lack of space can be overcome by some good old thinking and engineering.

Shane

Extreme? Not really, the holes are there anyway, yes will most likely need to machine them to suit the injectors, but in the scheme of things it's nothing really.
Thanks for the reply!

Doesn't the 1200 have them in the head rather than the inlet rubbers ?

Looks like I've confused everyone with my terminology - the head is the 8V, so that would be a K100

My understanding (which could be wrong here) is the 16v units (1100/1200) have the injectors in the inlet rubbers, 100 heads have them in the head?
Ive read the OP (and again possibly incorrectly) as installing injectors into the head as per 100 opposed to their usual location within the rubbers?

Shane

The injectors were originally in the head, and that's where I want to keep them. I can see advantages to moving them outwards, but the K100 rubbers and throttle bodies don't have anywhere to fit them. So in the head they will stay - I checked today if standard injectors fit - they do, so I only need a fuel rail and happy days.

Humour me here please , are you building a k100 8v engine not an k1100 16v as the title suggests?

Shane

I thought I'd answered this, but can't find it now, so yes #shane, The project is a K100 8V. This is going into a runabout road car, and as a learning project will be fine.
Progress so far, test fitted some injectors into the head, bought a set of K100 throttle bodies which had some screws broken in the castings, now ready to fit. I stripped and cleaned the head, and drilled some oil return holes - so now each follower "pit" has a drain. S quick hose down and popped it into the dishwasher, pics if anyone's interested.
So next steps is that the head needs welding and a skim. I've previously plugged the block, it's an auto so needs some drillings and a skim. Pistons wise I was hoping to get away without boring it, but there is a slight wear ridge which won't hone out, even with using forged pistons, so a rebore needed as well.
This lot has been sitting on my bench since I bought the kit off you (iirc #Shane) so it's time I did something with it. Only problem is this has awoken another goal, to go 970 block with a K16 head on it, I have a crank, 16V head has been bought from Germany, charge cooler I have...

I thought I'd answered this, but can't find it now, so yes #shane, The project is a K100 8V. This is going into a runabout road car, and as a learning project will be fine.
Progress so far, test fitted some injectors into the head, bought a set of K100 throttle bodies which had some screws broken in the castings, now ready to fit. I stripped and cleaned the head, and drilled some oil return holes - so now each follower "pit" has a drain. S quick hose down and popped it into the dishwasher, pics if anyone's interested.
So next steps is that the head needs welding and a skim. I've previously plugged the block, it's an auto so needs some drillings and a skim. Pistons wise I was hoping to get away without boring it, but there is a slight wear ridge which won't hone out, even with using forged pistons, so a rebore needed as well.
This lot has been sitting on my bench since I bought the kit off you (iirc #Shane) so it's time I did something with it. Only problem is this has awoken another goal, to go 970 block with a K16 head on it, I have a crank, 16V head has been bought from Germany, charge cooler I have...

Edited by Minimutly on 18th Mar, 2025.

Apologise I missed the response Paul, yes it was my 8V kit that you had purchased and my word that was a while ago!
I'd found a 970/1071 block late last year with a 1071 crank that I was tempted to use with a 16v head, I really liked the idea of turboing one.
Shane

Edited by shane on 19th Mar, 2025.

Yeah, Huw, not Paul, he was the alien with big eyes..
What's the significance of an 8V kit over a 16V one? Are the cam adaptors different, or something else?

Apologise again, I have sold a couple of "kits" of redundant "k" conversion parts and had a 50/50 chance with the name.

Essentially nothing, there are some differences with the 16v castings if I recall correctly, and may be wrong but the 1200 has a different oil gallery location/path at the cam drive end and has an additional 2 retaining bolts for the front conversion plate.
I have a couple of pictures but am inept at posting images.

Shane

Ok, thought there wasn't much in it.
I've spent a day prepping an 8v head today (this is head No2, which I'm contemplating gas flowing, fitting bigger valves etc - essentially because I'm someone who just can't leave anything alone if I think I can improve it...
Saw somewhere on the net that TurboPhil has been doing this with some success, maybe I'll do some searching. Head no1 is defo staying original, non turbo runabout. There is a 16V head on the way here from Germany, which might end up on a 970 block, but that's a long way off.

Well I welded up the V head, including the oil feed area so I can feed the oil without an external pipe.
I found an issue with it - it's warped, by quite a bit - estimate around 20 thou...Is this normal whilst welding? It's fair to say the head had evidence of a blown head gasket, so this may have been previous damage, but all the same, it would be nice to know if the next one gives me the same issue.

Sorry, 8V head

My 16v head came from Germany today, with a broken No4 inlet manifold - anyone got one?