|
Re: Big block hydraulic roller cams OK to 7000 RPM?
[Re: PorkyPig]
#1464774
07/08/13 02:08 PM
07/08/13 02:08 PM
|
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
CompWedgeEngines
master
|
master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
|
You need to use the right lifters, the right cam profile, and properly selected springs. Some Chevy guys going 7500 rpm. Everything has to be chosen accordingly.
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
|
|
|
Re: Big block hydraulic roller cams OK to 7000 RPM?
[Re: Streetwize]
#1464777
07/08/13 03:42 PM
07/08/13 03:42 PM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Quote:
my 517 Max wedge loves turning 7200 with a fairly healthy Bullet Hydraulic roller, iv'e had to trigger my tach shift light sooner because it gets there so quick. Pulls like a solid roller in this motor and throttle response is more like a comp eliminator car than a lot of even solid rollers.
My heads (Chapman/Zeus Stage VI's) also run the Race W2 billet hold-down blocks, I believe they are much more stable than cast in pedestals on big blocks at higher RPM. not sure it contributes significantly to the valvetrain stability but I'm quite sure it helps some.
Ron Silva I think runs the same Bullet HR (if it's not exact it's PD close) in his 501" small block and that thing revs like a banshee too. I'm real happy with the Bullet HR grinds, I think Bullet and probably the Cam Motion LS grinds are on the cutting edge of where you can get with a HR lobe and stabil valvetrain.
Wise... whats the spring pressure on your Bullet HR
and if you dont might what are the specs... I'm thinking
I will change my 416 over to a HR vs the solid roller
in there now when I get that engine out of the Rampage
|
|
|
Re: Big block hydraulic roller cams OK to 7000 RPM?
[Re: Streetwize]
#1464779
07/08/13 10:16 PM
07/08/13 10:16 PM
|
Joined: Jan 2003
Posts: 9,875
Weddington, N.C.
Streetwize
master
|
master
Joined: Jan 2003
Posts: 9,875
Weddington, N.C.
|
Meant to add that the Chapman heads use 11/32 stem BbC length 2.25" valves that seem way lighter than a comparable BBM 2.14 or 2.18, also I'm running Ti retainers and spent a lot of time on setting up the ideal rocker sweep and lateral clearances, I think that helps a little bit too. Also it's a b motor so the pushrods are comparably lighter and stiffer too, I think it all adds up, not to take anything away from the bullet lobes. Back in the mid 90's I crewed with a couple of guys in the early days of Pro 5.0 and way back then Bullet was cranking out all kinds of HR grinds for us to try, I think they saw the potential before most other cam mfgs did 
Last edited by Streetwize; 07/08/13 10:17 PM.
|
|
|
Re: Big block hydraulic roller cams OK to 7000 RPM?
[Re: Streetwize]
#1464780
07/08/13 10:56 PM
07/08/13 10:56 PM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
I have one Bullet cam but its a solid roller and I am thinking of a hyd roller... and I want 7000 rpm for the rest of my set up(I dont want to start changing gears and conv)
|
|
|
Re: Big block hydraulic roller cams OK to 7000 RPM?
[Re: PorkyPig]
#1464781
07/09/13 08:58 AM
07/09/13 08:58 AM
|
Joined: Jan 2003
Posts: 10,006
Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 10,006
Frostbitefalls MN (Rocky&Bullw...
|
The new Hemi uses hollow stem valves I believe, as does the 5.0 Ford motor for performance and high rpm stability in the valve train. If a guy wanted to take a hydraulic to the limit, there are a lot of things that can be improved, as mentioned. Beehive springs come stock on LS and New Hemis for that reason. Good (not cheap with the proper specs) valve springs are an absolute must. Titanium intakes, though expensive, would help a lot. Not going beyond needed weight in the pushrods, and finding nice light lifters all help.
Last edited by gregsdart; 07/09/13 09:03 AM.
|
|
|
Re: Big block hydraulic roller cams OK to 7000 RPM?
[Re: MR_P_BODY]
#1464782
07/09/13 10:25 AM
07/09/13 10:25 AM
|
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
CompWedgeEngines
master
|
master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
|
You learn a lot about hydraulic roller set ups when working on boat engines. These guys that run the big twin and triple screw 500- 572 ci boats put way more of a beating on the vslvetrain than anything here. The sustained rpm and occasional prop release will test the limits of everything. We arent really discovering anything new here, other than the typical Mopar builds,up until recent couple of years, hasnt considered hydraulic roller set ups. There was a fairly significant failure rate on some cheaper built big name lifters, so that scared some people. The guys that were using hi quality hyd roller lifters did not have issues. As stated early in my other post, its all about proper choice of components and application....
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
|
|
|
Re: Big block hydraulic roller cams OK to 7000 RPM?
[Re: CompWedgeEngines]
#1464783
07/09/13 11:39 AM
07/09/13 11:39 AM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Quote:
You learn a lot about hydraulic roller set ups when working on boat engines. These guys that run the big twin and triple
screw 500- 572 ci boats put way more of a beating on the vslvetrain than anything here. The sustained rpm and occasional prop release will test the limits of everything. We arent really discovering anything new here, other than the typical Mopar builds,up until recent couple of years, hasnt considered hydraulic roller set ups. There was a fairly significant failure rate on some cheaper built big name lifters, so that scared some people. The guys that were using hi quality hyd roller lifters did not have issues. As stated early in my other post, its all about proper choice of components and application....
What is considered a better hyd roller lifter that
can take a few extra pound of spring pressure(maybe 50-100)
|
|
|
Re: Big block hydraulic roller cams OK to 7000 RPM?
[Re: MR_P_BODY]
#1464784
07/09/13 12:43 PM
07/09/13 12:43 PM
|
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
CompWedgeEngines
master
|
master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
|
PM sent.. 
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
|
|
|
Re: Big block hydraulic roller cams OK to 7000 RPM?
[Re: BradH]
#1464788
07/10/13 02:30 PM
07/10/13 02:30 PM
|
Joined: Feb 2011
Posts: 4,302
Nebraska
72Swinger
master
|
master
Joined: Feb 2011
Posts: 4,302
Nebraska
|
Ive wanted to run a good HR on the street for a while but think its safer to go solid and run springs I know can take the RPM. At this point im thinking the Lunati Voodoo .600 solid roller would give me the most smiles per miles.
Mopar to the bone!!!
|
|
|
Re: Big block hydraulic roller cams OK to 7000 RPM?
[Re: Thumperdart]
#1464790
07/10/13 03:43 PM
07/10/13 03:43 PM
|
Joined: Jan 2003
Posts: 9,875
Weddington, N.C.
Streetwize
master
|
master
Joined: Jan 2003
Posts: 9,875
Weddington, N.C.
|
Hey I'm not choosing sides but the technology gap is shriking quite a bit. LS motors in what the low 8's with juicers and turbo's I could have went solid roller but any more power on my motor would have been all upstairs and any more than I have would probably start eating up the stock 230 block. Like I said with My heads i didn't need any super high lifts (and the springs to go with it) plus I already had the lifters and springs left over from my old (somewhat milder) 508 RB. From scratch I agree there's no real advantage except the occasional lash and maybe valvespring life if you've gotta have higher lifts/durations to get you to the power level you want. And as said earlier if you have a creatively plumbed turbo you might think twice about not having to do hours of plumbing removal and reassembly just to set lash (if you otherwise might not even have to  )
Last edited by Streetwize; 07/10/13 03:45 PM.
|
|
|
Re: Big block hydraulic roller cams OK to 7000 RPM?
[Re: BradH]
#1464791
07/10/13 03:52 PM
07/10/13 03:52 PM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Quote:
If you expect to turn that sort of RPM and aren't restricted from using solid roller lifters, why would you want to run hydraulic rollers? 
Maybe because I'm sick of hearing all the valve noise...
and I run a tighter lash than called for
|
|
|
|
|
