the555car

Hi All

I came across some information on the a SR20DE forum, debating the effectiveness of using rocker arm stoppers (RAS) on an SR20DE (FWD) with stock valvetrain.

The verdict (not agreed by all, but seems to be the general consensus) was:
- NO RAS on stock valvetrain as it causes more damage than it prevents
- YES RAS on built valvetrain (springs + retainers mainly)

Please read the following links for the debate and more information:
Read me
Read me
Definitely read me
Yes read this too
Last one

CN: No RAS means rockers pop out and act as a "fuse," usually only needing to be put back in place or small parts replacement (shims etc). RAS on stock valvetrain supposedly holds the rocker in, but this can then jam the valve open, thus coming into contact with the piston, bending the valve and possibly other damage. If the valvetrain is upgraded (springs & retainers) the spring will hold the valve closed and push the rocker out against the RAS, thus causing almost zero damage.

Does this pertain to the RWD SR20DET that is commonly swapped into a 240SX? I am assuming so as they valvetrain is set up very similar and the RAS fits either engine. If they are completely separate and this issue does not concern RWD SR20DET engines, please close this thread

Anyone experienced rockers popping out or engine damage to RAS? Please include whether or not your valvetrain was stock, the damage that occured, and what (you think) caused the damage.

I realize that the general way of thought is that RAS are good insurance, this was my perception as well, until reading those threads. I was under the impression that the RAS would stop the rockers from flying out, and they would just sit there nicely and all would be well. I am looking for more information related to RWD SR20DETs, as for obvious reasons, there isn't much on the SR20DE forum.

Please do not post without backing up your comments with some sort of reasoning and proof (photos, data, anything) if you have it.

cheers
-Evan

NB: All claims/information/data are from what I have read, I have no direct experience with this, nor to I agree or disagree with either school of thought at the moment.