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-   -   Schubek Lifters (https://classracer.com/classforum/showthread.php?t=21865)

Pedigo Perf 04-24-2013 07:08 AM
Re: Schubek Lifters
 
Quote:
Originally Posted by Greg Hill (Post 378709)
We run the Smith lifters in both of our motors and go through the traps at 7600-7800 and have had no trouble.
Same here.

Dion Hildebrandt 04-24-2013 09:13 AM
Re: Schubek Lifters
 
Quote:
Originally Posted by brent flynn (Post 378708)
Im guessing that the problems are coming from: too much ramp, too much RPM(Valve float) and not enough spring, is what causes the problems... Everything has a limit...even roller cams... i would like to hear from all the guys that arent having trouble with Smiths or even older Shubecks...These are guys that are probably running less than 7k through the traps...
I have the older Schubecks that came with my engine, I have had the engine for 6 or 7 years and I would guess there is maybe another 10 before that and no problems. I did break a rocker a few years ago, had everything magnafluxed and scoped , all that showed was two more cracked rockers, I cross the stripe at 72-7300 RPM's...

brent flynn 04-24-2013 07:06 PM
Re: Schubek Lifters
 
Quote:
Originally Posted by Greg Hill (Post 378709)
We run the Smith lifters in both of our motors and go through the traps at 7600-7800 and have had no trouble.
Thanks Greg... Its good to hear :) Small block Chevy? I will be under 7k... around 6500-6700 with 190-200lbs on the seat, and roughly 400 over the nose... I should be fine, huh?

Alan Roehrich 04-24-2013 07:24 PM
Re: Schubek Lifters
 
We were turning 7800 with the 427 at Bowling Green this weekend, with 255 on the seat, and 600 open. We have too much open right now, I need to change springs.

What will hurt ceramic lifters is low spring pressure, resulting in a loss of valvetrain control. They do not like to bounce, whether it is on the ramp, or over the nose (commonly called "lofting") and that is where you'll see them break.

brent flynn 04-26-2013 05:29 PM
Re: Schubek Lifters
 
Quote:
Originally Posted by Alan Roehrich (Post 378789)
We were turning 7800 with the 427 at Bowling Green this weekend, with 255 on the seat, and 600 open. We have too much open right now, I need to change springs.

What will hurt ceramic lifters is low spring pressure, resulting in a loss of valvetrain control. They do not like to bounce, whether it is on the ramp, or over the nose (commonly called "lofting") and that is where you'll see them break.
In your opinion, for less than 7k, do you believe that 200seat/400-450open will work? Or should i shoot for a little more?

Alan Roehrich 04-26-2013 06:00 PM
Re: Schubek Lifters
 
Quote:
Originally Posted by brent flynn (Post 379029)
In your opinion, for less than 7k, do you believe that 200seat/400-450open will work? Or should i shoot for a little more?

Not knowing your combination as I do ours, I really can't say. I got a lot of help from fellow racers and fellow engine builders, as well as cam grinders to find what our combination likes. You should speak with your cam guy, and with people running similar combinations. Some engines that run at a lower RPM use more aggressive cam lobes, and still need as much spring pressure as higher RPM engines.

brent flynn 04-26-2013 09:18 PM
Re: Schubek Lifters
 
Quote:
Originally Posted by Alan Roehrich (Post 379031)
Not knowing your combination as I do ours, I really can't say. I got a lot of help from fellow racers and fellow engine builders, as well as cam grinders to find what our combination likes. You should speak with your cam guy, and with people running similar combinations. Some engines that run at a lower RPM use more aggressive cam lobes, and still need as much spring pressure as higher RPM engines.
THanks...Im gonna call Chris @ Comp and give him my combo( i have a comp cam) to see what he says about it...im sure he can help me... I appreciate the responses...

Alan Roehrich 04-26-2013 10:37 PM
Re: Schubek Lifters
 
Quote:
Originally Posted by brent flynn (Post 379051)
THanks...Im gonna call Chris @ Comp and give him my combo( i have a comp cam) to see what he says about it...im sure he can help me... I appreciate the responses...
Chris will give you good advice, he is one of the best guys to deal with for Stock and Super Stock cams and valvetrain.

brent flynn 04-30-2013 09:50 PM
Re: Schubek Lifters
 
Any reason to run restrictors , with Smith Machine lifters?

Todd Hoven 04-30-2013 10:48 PM
Re: Schubek Lifters
 
Yes to keep the oil in the pan and going to the mains and rods., especially with roller rockers. SOP with 400's in our deal


Quote:
Originally Posted by brent flynn (Post 379690)
Any reason to run restrictors , with Smith Machine lifters?


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