I seriously have no idea why you guys are wondering so much about spray pattern with a boosted application. You can have a stream piss down the injector hole and the boost is going to swirl it and atomize it very efficiently. I think many of you are looking too far into this and not realizing that a boosted engine is a whole different breed of animal. Spray pattern means nothing when the intake track is pressurized..it means the world when you rely on atmosphere and cylinder head/intake manifold design. Don't think too much into this.
I agree, Every test I have seen so far that shows injector spray pattern for a Z32 is nothing like the conditions which exist inside the lower plenum. For a start the lower plenum has a venturi hole to atomize the fuel as it feeds into the lower plenum. I havent see any test that simulates this therefore all previous spray pattern pictures are useless.
the rochestser injectors will not work with the current design, however, if the racetronixs dimensions are the same, they still don't acutally fit into the holes of either plenum as the injector hole is only 11mm wide and the racetronixs are 12.7mm, so some machining would be needed unless we rely on the o-ring to act as the insulator - which could/should work fine. but the depth of the injector then only changes by 4mm. after seeing the above dimensions, i'm not as eager to have an alternate design for 4mm (the current design may even still accommodate the rochester injector while lowering the whole fuel rail 4mm). this might be something someone may want to test on there own and let me know. i am willing to work with those who just want a rail (rail price would be $400 plus shipping). i am also looking to ship as many of the Australian orders at the same time to one address to lower shipping costs. So do coordinate however you can as we will be able to dramatically lower shipping costs. again everyone, thank you all for the interest and great feedback.
correct, The injectors fit straight down the hole with the Orings acting as insulators. This works fine with no collars.
with that, the rail may work in its current design just fine! very nice if this is the case... how much are the rochester injectors and what sizes are available? if you know off the top of your head great... if not, i'll look them up later ... holy crap, just look into how the bosch ones fit... the same as what you are talking about... hell, i may not even need the adapters, unless people just feel better about having them... this is very good to me, cleans up the number of seals, lowers the injector for the early style plenum concerns. hmmm... interesting... thanks for the input and info and thanks to everyone else for similar concerns and questions, you all may have just help make an even better fuel rail!!
Well I paid AUD $360 ( about USD $320) for 6 new 1000cc Siemens Injectors. The 870cc Delphi's are even cheaper. You can buy almost any size injector in this style body. Bosch, Delphi/Rochester ( Delphi bought Rochester from GM ) and Siemens all have the same footprint injector. The Siemens family in this body size is called DEKA. Not sure about the other two. usually its enough to ask any vendor if they have "Rochester style" injectors. Can I suggest you buy one or 2 and see if it will fit up OK. If it does i will buy a rail. Rather than finish off the one I have here. As I am going to run E85 in the race car it would probably be better to have a Steel rail rather than the Alloy one.
I have decided that i will put my hand up to be the test guinea pig for these rails... I'll just need a set provided for testing purposes (free) and i'll post up my results for everyone
Awesome. Like to have some more close up pics from top and close to injectors. Where and how did you relocate the fuel pressure regulator and Dampener?
you can use the stock FPR if you wish but I suggest running an external FPR mounted off to the side. The damper is not needed for this product.
