Solid lifters in Stock

Mark Yacavone · 02-12-2019, 11:43 PM

Quote:

Originally Posted by Chris Hill

When did this rule change happen?

2018, I believe.

Rich Biebel · 02-13-2019, 07:59 AM

Mark, newer Onan V twins(air cooled) engines are built by Subaru-Robin from what I know...…..They are 60 degree overhead valve engines used in 5.5 and 7 kw RV generators. Valve lash spec is .002-.003...

They usually get loose on the lash and not tight. They routinely fail from heat working on the valves, springs, guides and eventually the guides get loose in the head. Real bad problem on those. I replace heads on them all the time...….The hotter they run the quicker and more likely the guide problem will happen.....And owners that don't change the oil often enough. 2 quarts is all they hold.

Pat6868 · 02-13-2019, 11:17 AM

I ran my 327/275 stocker engine with plugged hydraulics at .005 lash cold. It did not like any tighter.

SSDiv6 · 02-13-2019, 03:53 PM

The ramps on camshafts on hydraulic and solid cams are designed differently for many reasons.

Due to the various ramp and lobe designs in Stock Eliminator such as dwell and non-dwell lobes, when you plan to switch from hydraulic to solid, the best is to talk to the camshaft designer at the camshaft company; not the salesperson.

If you are building a new engine, just have a new camshaft made for use with solid lifters. It will have the proper area under the curve and also, with the right lobe, you can create lofting that will provide the engine with more lift than what the actual cam was physically designed with.

Yes, due to the dynamics of a solid lifter, they tend to make more power and RPM quicker when compared to a normal hydraulic lifter only if the valvetrain geometry has been optimized. When I say normal hydraulic I am not talking about a restricted travel or blocked hydraulic lifter.
Also, a solid lifter will be lighter than a hydraulic counterpart. I always recommend EDM drilled solid lifters that are DLC coated, installed with the proper lifter bore clearance.

Many years ago during a conversation with Don Tweles at General Kinetics, he shared that his dwell lobes could be run 0.006 ~ 0.010 with solid lifters.

Rob Petrie E395 · 02-13-2019, 08:42 PM

Thank You to everybody who replied since I revived this thread. I'm going to give it a try. I've got to do something to find some ET. Hopefully this, a 200 transmission and a couple other things will help get me going In the right direction.

Chris Hill · 02-15-2019, 04:12 PM

Quote:

Originally Posted by Mark Yacavone

2018, I believe.

Thank you,

02-13-2019, 07:59 AM	#2
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,314 Likes: 25 Liked 544 Times in 213 Posts	Re: Solid lifters in Stock Mark, newer Onan V twins(air cooled) engines are built by Subaru-Robin from what I know...…..They are 60 degree overhead valve engines used in 5.5 and 7 kw RV generators. Valve lash spec is .002-.003... They usually get loose on the lash and not tight. They routinely fail from heat working on the valves, springs, guides and eventually the guides get loose in the head. Real bad problem on those. I replace heads on them all the time...….The hotter they run the quicker and more likely the guide problem will happen.....And owners that don't change the oil often enough. 2 quarts is all they hold. __________________ Rich Biebel S/C 1479 Stock 147R Last edited by Rich Biebel; 02-13-2019 at 08:01 AM.

02-13-2019, 11:17 AM	#3
Pat6868 Member Join Date: May 2010 Posts: 100 Likes: 5 Liked 81 Times in 26 Posts	Re: Solid lifters in Stock I ran my 327/275 stocker engine with plugged hydraulics at .005 lash cold. It did not like any tighter.

02-13-2019, 03:53 PM	#4
SSDiv6 VIP Member Join Date: Feb 2003 Location: Glendale, Arizona Posts: 3,036 Likes: 710 Liked 1,538 Times in 575 Posts	Re: Solid lifters in Stock The ramps on camshafts on hydraulic and solid cams are designed differently for many reasons. Due to the various ramp and lobe designs in Stock Eliminator such as dwell and non-dwell lobes, when you plan to switch from hydraulic to solid, the best is to talk to the camshaft designer at the camshaft company; not the salesperson. If you are building a new engine, just have a new camshaft made for use with solid lifters. It will have the proper area under the curve and also, with the right lobe, you can create lofting that will provide the engine with more lift than what the actual cam was physically designed with. Yes, due to the dynamics of a solid lifter, they tend to make more power and RPM quicker when compared to a normal hydraulic lifter only if the valvetrain geometry has been optimized. When I say normal hydraulic I am not talking about a restricted travel or blocked hydraulic lifter. Also, a solid lifter will be lighter than a hydraulic counterpart. I always recommend EDM drilled solid lifters that are DLC coated, installed with the proper lifter bore clearance. Many years ago during a conversation with Don Tweles at General Kinetics, he shared that his dwell lobes could be run 0.006 ~ 0.010 with solid lifters.

02-13-2019, 08:42 PM	#5
Rob Petrie E395 VIP Member Join Date: Dec 2007 Location: Woodlawn IL Posts: 1,092 Likes: 162 Liked 216 Times in 77 Posts	Re: Solid lifters in Stock Thank You to everybody who replied since I revived this thread. I'm going to give it a try. I've got to do something to find some ET. Hopefully this, a 200 transmission and a couple other things will help get me going In the right direction.