If ya are going to pull them off it will be a good time for him to replace them.

 

Hmmm. Well WD, since you are local how about you sell me the 918s cheap?

Actually I wouldn't mind getting in touch with you, see if we are feeling the same thing.

 

If you have issues at 1/2 turn, go 1/4 and re-evaluate. You could also cut it to 1/8 and evaluate again. It's gong to be trial and error if it really is a lash problem. You can find lash increments in my valve adjustment guide on my Tech Page.

 

Yes, we need to get together and talk some serious LT stuff. I have a shop at my house between Moore and Norman. I'll PM you with my cell number and a map.

About my Comp 918 Beehives,they are new! I got the engine running in September last fall (everything new) and ran it in about four bracket races. Then only two runs at the track last Sunday. Bert Chambers (Moore Machine, 12th Street) set-up the springs on the AFR heads. Therefore, I can't believe those springs are "completely" at fault here.

Additionally, I also have a set of the dual-spring Comps (new in the box). However, when Bert checked them, they didn't meet the published Comp spec for lift (less-than .580 actual).

WD

 

Warren,

Yeah usually the Comp Beehives last longer than that, but still go in and check your seated height pressures on them. What you are discribing is a perfect sign of valve float and I've seen that before on those lobes. MAKE SURE it's not that before you rule it out.

I've had the beehives keep their pressure 20,000miles so normally they work flawlessly, that's due to the good kobe quality spring wire.

Bret

 

Here is another theory on what could be causing my high RPM problem (momentary “hit/miss” in 2nd gear around 6100, “during heavy load” just prior to shift).

One of the local performance machinists (Bert Chambers) thinks the problem is pre-detonation due to the 12.2-1 compression and not enough octane. And, that I should be using 110 octane with that compression ratio. Also, the 104 octane I’m using is from last fall (maybe lost points over the winter?) and possibly the reason this problem was worse this first time out. I had some minor symptoms of the same problem last fall, but not this bad.

Bert also thought HD valve train float wouldn’t be just a momentary hit, it would fall flat. I’ll probably still reduce the lifter pre-load to 1/4 turn (from 1/2) and go to 110 octane to see if that helps.

WD

 

Ya are shifting before it has a chance to stay.
GO to 7,000 and see if it stays.

Don't think ya need fuel. Figure your DCR.
Have run 13/1 on pump gas and the DCR is determined by the cam. Stay below 9.0DCR.
It won't fall flat unless it's ALL of the valves or at least half. If it's 1-2 valves and the rest are right on the edge then it will be a miss.

 

On a LT1 I can't see how you are running into detonation.

Bret