Race tech emulators - fill rebound hole?

I am about to fit RaceTech Emulators and K-Tech springs to my K9 front forks. Q: after opening out the lower holes on the Damper Rod's, do you leave alone or fill the upper REBOUND hole, having looked on 3 forum's there seems to be a differing opinion, What are Org's opinion or experience please.

JOHN

[johnnyrod]

No, don't do it, no need. Don't drill the extra compression holes either, just open out the existing holes a little.

[Lissa]

We didn't fill the holes either.

I followed the racetech instructions and didn't fill in the rebound hole, I found there was not enough rebound damping, albeit for heavy track use. Having filled the holes in there's much more rebound damping and they handle much better. You may not need so much rebound damping for road use though.

[Luckypants]

Originally Posted by johnnyrod

No, don't do it, no need. Don't drill the extra compression holes either, just open out the existing holes a little.

What he said, drilling the extra holes can leave you with NO damping at the very bottom of the stroke. Icanopit is spot on to, it's not needed for the road.

No, no need to do that..so as they say ^

Reason you want to close rebound hole is to get more rebound. Since rebound is controlled with oil weight you can than go to thinner oil which is better than thicker oil, more consistent and less sensitive on temperature changes.

[johnnyrod]

Sorry forgot to say, I've heard that the damer rods in teh SV have plenty of piston ring blow (wash) -by so you can indeed weld up the hole. I've not tried it but I do find the rebound damping is a bit weak as stock. Zadar's right you could do it and control using the oil weight, thinner oil works fine in the emulators which are adjustable anyway. TBH I made the mistakes of using progressive springs in the forks (alost impossible to bottom the forks, or even get much beyond half way), and also drilling the extra holes. With the forks off and springs out, when you pump them you can feel the lack of damping at full compression, but in the real world of road and track, they're way better than stock and enough to scrape the pegs, I think you can't go too far wrong.

Interesting - so if you aren't closing the rebound holes what weight oil are you putting back in the forks - same as before the emulators or are you using thinner oil?

Yep, same as before. Rebound is main reason to use heavier oil.