On saturday i put Crane Gold self alineing 1.6 roller rockers on my car. Now under like 2,500 rpm it hesitates kind of bad. I took it out and ran it thought the gears tonight and it felt like in the upper RPM range like it had a flat spot in the power band or like i was peeling out. When I came back I poped the hood and at idle the vavle train is quiet but when I reved it up a little bit it sound pretty noisy specficly on the drivers side. Could this be too much vavle lash or what. I dont know what to think.

 

You are always going to be hearing a bit of noise from them but you have your valve lash to tight. It will cause stumbling and a loss of power. You basically want to adjust them about 1/4-1/2 turn past 0 lash. 0 lash is when there is no more up/down movement in the pushrod.

Aaron

 

You should probably pull the valve covers and recheck lash, for peace of mind if nothing else. I set mine at 1/2 turn past the point where the pushrods no longer spin freely.

 

I could still spin the pushrods after the RR's were on. It almost felt like they were eaiser to spin than when the stock ones were on.

 

I found that the best way to adjust rockers is well the ingine is running.After the clacking stops go 1/4 turn more.Try that.


Rob.

 

A very common mistake is people consider the point at which the rods dont want to spin any more 0 lash. This is not 0 lash. 0 lash is the point at which there is no more up/down movement. At 0 lash you'll still be able to spin the pushrod quite easily. You need to slowly tighten the nut and keep lifting up and down on the rod until there is no more movement. Then tighten 1/4-1/2 turn past that.

Aaron

 

I think on shoebox's site, it says as soon as you start to feel resistance, I think some people get confused?!?!

 

its up & down movement or as soon as you feel any resistance, on my comp r lifters I stop at 0 lash where I feel resistance. Seems to work great, who here disagrees with that & prefers up & down movement?

 

Hey guys thanks for all of your help. I'm going to try and readjust them on wednsday (first free day). I'll let you all know how it turns out.

 

i use the up and down method.

you might have them too tight.

 

You might have over-tightened the rockers. Use the method described above.

Did you replace the valve springs as well?

 

No I didnt change the vavle springs. I have been told both that I should and dont need to so i went the cheaper route. My stock springs have 58,000 miles on them. I will be doing a cam in about a year so I will get springs then.

 

Hey guys thanks for all of your advice...I readjusted the RR using the method 1 on shoebox's website and the power feels better. I cant tell to well because its rain here today, but on the highway in 6th gear it feels like it has some of the power back.

 

With 1.6 ratio rockers you will be introducing more lift to the stock springs which certainly might have adverse affects. Would you rather spend $100 on springs now or rebuild your motor when you break a spring and drop a valve?

1/4 to 1/2 turn past zero lash should be perfect for your setup. Make sure you have the cylinder your are working on at TDC when you are setting lash.

 

I would strongly advise you change out your stock vavle springs. Some lt4 springs, even some used lt4 springs would work fine and are very cheap. Probably less than $30-40. The stock springs can can weak over time with just the 1.5 stock rockers. Adding more lift with the 1.6 is almost a sure bet that your going to have valve spring failure!

Aaron