Lifter rule in Stock

[sammy pizzolato]

This new rule is smart for us Racers that have lost good motors to those JUNK Ceramic Lifters!!!! and for NHRA to check cams.

[Dan Fahey]

Originally Posted by jimi

been using solid lifters on hydraulic cam grinds for years in street cars adjust the lash at.006".

Could have a Max Spring Rule instead!
Simpler..
D

[MikeMoller]

Originally Posted by Larry Hill

I'm going to keep my hyd. lifters, solids would be a lot noisier and then I would have to keep them adjusted, and that might..............would cut into my adult beverage time.

X2 on that Larry!!

By the way, since lift will be checked at zero lash but you wouldn't run a solid at zero lash, I assume you have to give up some lift if you change over.

[Mark Yacavone]

Originally Posted by MikeMoller

X2 on that Larry!!

By the way, since lift will be checked at zero lash but you wouldn't run a solid at zero lash, I assume you have to give up some lift if you change over.

Yes, but I don't think you need .006. A lot of older motorcycle exhausts were around .003.
Somebody try and let us know ....

[killintime6968]

Please excuse my ignorance. But does this mean we can now run a solid lifter type cam in a hydraulic cam engine. IE a 396 350hp. Or just solid lifters on the hydraulic cam.

Bruce Cameron
1969 Nova E/S
1968 Camaro SS/I

[Dave Muller]

Since any duration is allowed I don't see why someone couldn't grind slight clearance ramps (just a couple thou) into them, but it doesn't seem worth bothering with.

[Alan Roehrich]

Originally Posted by Rick Schilling

I know this should be obvious, but if your combination already uses hydraulic roller lifters you can convert to solid rollers now?

If that is the case, then a lot of stockers are about to gain a lot of RPM, and spend a lot of money. This could get really interesting. Or really stupid. Maybe both.

[Dwight Southerland]

Originally Posted by Alan Roehrich

If that is the case, then a lot of stockers are about to gain a lot of RPM, and spend a lot of money. This could get really interesting. Or really stupid. Maybe both.

Alan, that usually goes hand in hand. It's like the chicken and egg thing.

[Alan Nyhus]

Originally Posted by Mark Yacavone

Yes, but I don't think you need .006. A lot of older motorcycle exhausts were around .003. Somebody try and let us know ....

Mark, this has been done for decades on high perf street engines.

You can be down around .002 (hot) with a solid lifter on a 'hydraulic' cam lobe. Basically, as close to '0' as you can without hanging the valves open. A good rule of thumb.... on a typical iron head/iron block setup, you need around .003 more lash 'cold' than what you want it at 'hot' to allow for expansion. ie: .006 cold will get you .003 hot.

Iron block/alum. heads & alum. block/alum. heads expand differently than iron block/iron head, of course.

[Grey Ghost]

Originally Posted by Bob Don

I just emailed NHRA Tech to get clarification on the new language. This is the response:

"The intent was/is to allow the use of a solid lifter in place of a hydraulic, you may not replace a flat tappet with a roller.

Thanks

Joey Gorman
NHRA Assistant Regional Technical Director
Office-(317)-969-8609"

...and there you have it.

Here we go. Why do the hyd cam combos get an "up grade" and not the solid cam combinations?? IF ( I am not advocating for this) everyone had been up graded to rollers would that not have leveled the playing field? Am I missing something here? Are not the lifter concerns "wiping out a motor" shared with solid and hyd cams?