SlickVert

iTrader: (5)

Hyd roller cams/valve train have come a log way, but still hit or miss at controlling the valves above 6,500rpm.

My goals are a 383 stroker, ET 215 heads with a cam in the mid 240’s with .650 lift. Looking for a lope as aggressive as a LSK, and to be able to control it up to 7,400rpm.
Not sure if a Hyd. will get it done.

Street/Strip Solid rollers are getting more common lately.

I am looking for info, recommendations, do’s and don’ts for Solid Roller Street/Strip set-up.
What do you think?
Bob

slow trap

iTrader: (22)

i have a sr in my street/strip car and it works great.if you want to turn 7400 rpms and can live with the extra noise i wouldn't hesitate on going that route.also i hardly ever have to make valve lash adjustments,but i only drove it maybe 2k a year.

GuitsBoy

iTrader: (4)

I would fully trust a hydraulic setup to 7000 or even 7200, but going to 7400 might be pushing it just a touch. You can probably control a LSK hydraulic cam at 7400 if you machine out the heads and run a stouter spring. I dont know if the popular dual spring kits will handle it.

SlickVert

iTrader: (5)

Tell us about your set-up.
What Lifters, Push Rods and Rockers?
How high do you spin it?

SlickVert

iTrader: (5)

ET heads come with larger spring pockets, my have Comp 977 with 1.45 spring OD.
With the ET 11 degrees valves they are a little longer and therefore heavier.

slow trap

iTrader: (22)

the car is an 85 bird with an old school sbc in it so what i have will not work with the ls1 but the idea is stilll the same=great dual springs matched to your camshaft,3/8 pr,lifters is a hit or miss,i have only run comp and cranes but i've heard of a few comp failures from motors in the 8,000 range.controlling the valve is the main thing so i'd run some tit.retainers and a quality,matched spring .i know their customer service is pretty sorry but some people at comp are very knowledgeable and know their stuff,do you have a particular manufacturer in mind ?

DavidNJ

The solid roller will allow you to have a much more aggressive ramp and more lift supported by a much stiffer spring. You can't run 250# on the seat and 600# over the nose with a hydraulic cam.

The result would let you get the big numbers at .200 and .050 with less time off the seat. I believe DAPERSLO is using a solid XE cam (a little more aggressive than an LSK) with a 1.95 rocker!

The trade-off are more noise, the need for adjustable shaft rockers or a stud girdle for stability, adjustments (which to me are a good thing), potential lifter issues. The lifter issues occur because there is some pounding on the needle bearings at idle and other low oil pressure time. Schubeck has lifters without needle bearings, however they are over $900 set.

If racing is important and solid rollers are allowed in a rule restricted class, not using them just means you aren't serious. For bracket racing, are they worth the trade-off?

Note: In the 60's, before roller lifters for street cars, all of the real performance cars--Z28s, LT1, 435hp, and L88 Vettes, Boss 302s, Boss 429s, Super Cobra Jets, Hemis, etc.--had solid lifters.

Beast96Z

iTrader: (21)

The valves in my 265's are bigger than the the 215's, and I still plan to run hydraulic. I'll be using the LSK's, but I did get the lighter, light weight titanium retainers (half the weight of the normal titanium retainer) and the .700" lift PSI springs. Morel lifters also. I think you'd be fine with a 2.02 valve and the same combo as I have above.

SlickVert

iTrader: (5)

If I go hyd, I will also use Morel.
I will check with Crag about the lighter titanium retainers.
I do like the LSK lobes, but I have not seen any LSK spinning into the low 7,000 with valve control yet.
What push rods are you going to use?
Bob

speedracer5532

iTrader: (8)

I am running a solid roller in my 402. It is a Comp Cams solid roller 254/260 660/666 113+1 cam. I am running AFR 225 heads with Comp 917 springs. The Comp 917 springs are 1.550 diameter with 200 lbs seat pressure and 596 lbs open pressure. The rocker arms I am running are the new Crane shaft mount rocker arms. Push rods are 5/16 .080 wall. So far the highest I have spun it is 7200 but I wouldn't be afraid to spin it to 7400.

DAPSUPRSLO

iTrader: (14)

Yep, that's my setup. At this time and point in development in hydraulics I don't believe you'd be able to run this kind of lift profile with a hydraulic roller, which is where the advantage comes in from the use of solids, their ability to take huge spring pressures to control these kind of super fast opening and closing rates. Theoretically it should make good power down low and up high for the reason you've stated above but i've not tested it yet as i'm finishing up the car as we speak. I'll report back with the results as soon as I have them!

DavidNJ

What are the pressures on those springs? The limit is how much force the hydraulics can take.

You can build a great bracket racer with a hydraulic. And a great street car. However, if your class as rules or you are trying to be exotic or set some leading dyno numbers, you will need the solid roller.

And clearly, you can make a great 6500, maybe even 7000rpm motor with hydraulics. But you need to keep the valvetrain mass down and use a good spring.

Cstraub

iTrader: (1)

There will be a new Hyd roller lifter introduced later this year that has been in testing for the last 18 months. It will allow you to run 200# seat pressure and 7800 rpm constantly without worry of pumping the lifter up and hanging the valve open. So you will have the benefits of hyd roller maintenance with the rpm capability of solid roller. Should be released sometime in late August.

DavidNJ

Are you making it?

P.S.
You're at Stefs? Do you have oil pans and valve covers with oilers for the LS engines?

Cstraub

iTrader: (1)

No we are not making the lifter another company is. You can get our LS1 designed wet and dry sump stuff through LS1 Tech sponsors such as SDPC, TSP, Thunder, Futral, and West Coast Cylinder Heads to name a few. Along with valve covers we only make the spacers at this time.

SlickVert

iTrader: (5)

Sounds like a great combo!
What Lifters are you using?

speedracer5532

iTrader: (8)

I am running Comp solid lifters. Tony Mamo modified them for me. Supposely Comp has redesigned them now but at first there was a problem with them. Comp had a second oil hole in them and you would lose oil pressure. Tony had a set and offered to weld the second hole and guarantee them for me. So far they are working fine.