hey guys just wondering if the series 2 lower plenum is different to the s1 in any way. I did search the tech section but cant seem to find it. thanks in advance.
some real facts series 1 series 2 comparison the main difference is the venturi design which is wider to accomodate the series 2 wider spray pattern In the comparison pic you can see that the fuel rail also sits lower . you can see on my series 2 plenum pic how you can see the injector head with no narrow tunnel like series 1 . you can NOT use a series 2 lower plenum on a series 1 head ..wont work for obvious reasons . Like I have said before no 300 degree setup or adaptor setup in a series 1 is as good as a series 2 setup. (edit: the pic of my series 2 is with topfeed injectors which also have a wide spray pattern)
thanks heaps for the pics. I had my engine mosty put together by dr400zy but did not give him my lower plenum (Forgot to) so I have my old one for sale and better make sure I sell right one to potential buyer. Thanks again heaps. Cheers Eddy
Thread dig... Can anyone else comment on using a series 2 lower plenum with series 1 heads? I am running a series 2 lower plenum with series 1 heads with no issue at the moment (285kw at 18psi and more boost to come once I upgrade to bigger injectors) Just curious if anyone else is running series 2 lower plenum with series 1 heads??
you must have just enough gasket sealing there to make it work . but a big mismatch step at the venturi . did you try and open up on the venturi on the head a little or just throw it on?
Yeah noticed the mismatch but was under the impression others had just bolted it on also so figured it must be ok? Lol, wasn't ideal but just a rush at the end to make the tune drag day that didn't end up happening. Didn't machine it, but does a good job regardless I guess. Had I known in the first place that the lower plenums were soo different, (as I only noticed when pulling them both off) I'd just have bought the nismo 555's or a 300 degree rail... But surprised it's fine as it is now... Much like ur s2 double lower insulator injector install Anyways, if anyone is considering using a s2 rail with series 1 heads, I'd recommend using both s1 and s2 lower insulators rather than change the lower plenum as it's a bitch of a job and also has other ramifications ie the venturi mismatch... I'm really shocked actually as I have read countless threads that if u wanna run series 2 rail, u gotta change the lower plenum also... But it is muuuuch more involved than that. :/ Either way, it works, but is not ideal...
Just checked the series 2 engine in the shed and the weird thing is, they have used the series 1 intake gaskets? (series 2 heads and lower plenum) Unsure if it was from factory but the larger venturi opening seems like it would be slightly impaired by the gasket. The gaskets on the engine may have been changed I guess. But all the rest of the gear on the engine appears to be stock spec. Hmmmmm... Maybe the heads were pulled at some stage and the wrong gaskets used?
maybe the plenums were just pulled and replaced with wrong gaskets . yeah it amazing what you can get to work but not really a good set up.
Yeah I have to agree it is not the best set-up. Stoked with the results tho! Essentially at the power level I'm at, it seems to be no restriction... Or no noticeable restriction anyways... We'll see how things pan out with the bigger injectors.
Plenum Difference issues Old thread here - but its the closest to my problem at the moment I changed plenums due to powder coating and didn't realise the new one is a S2 plenum instead of a S1 Plenum As per the above statements in previous posts - you cannot run a S1 Plenum on a S2 Lower Plenum with S2 Fuel Rail. So what about reverse? Can you run a S2 Plenum on a S1 lower Plenum with S1 Fuel Rail? What differences / problems will there be with the fuel rail height? I note already that the EGR is different in its bolt position, specifically that the drivers side EGR (Exhaust Gas Recirculation) Pipe is about 30 degrees anti clockwise in that the S1 plenum bolt hole goes on the outer edge of the plenum whereas the S2 plenum bolt hole fits directly under the plenum. Can the pipe be EGR stainless pipe be twisted to fit in this case or is the only way to replace the EGR pipe or remove the EGR altogether? (This is my current problem - lol) I'm trying to avoid removing the EGR for pollution legal reasons alone. What other differences will be present and will the spray height difference be an issue or not - should everything else remain S1 style like the lower insulating injector seals/ S1 fuel rail etc.to make this work? Thanks in advance :zlove:
Just not good (You mean series 2 plenum on series 1 heads)???? Get a series 1 lower plenum My bad you are talking about upper /lower plenums ..can't help you there
Really appreciate that! Thanks a lot Eric! I was starting to sh.. bricks for a minute! Appreciated.......
Question for Chrispy and A2? If you two guys were me and were facing the EGR pipe to be fixed - what would you do given the motor is in situ? Just wondering what you both would do if in same position, given both your experience? 1. Cut weld pipe as suggested by A2? (Can this be done in situ do you think?) 2. Is there an alternative to welding - (i.e. clamp cut pipes) 2. Replace Pipe with correct S2 pipe (again - can this be done in situ?) 3 Change to non EGR Regards
I was in this exact situation when I put my motor together. I removed the EGR. Changing the EGR with engine in would be a mission and a half. Rewelding the flanges would be a bit tricky too.
