Good article! " Dyno Shootout: Solid Roller Vs. Hydraulic Roller "
Thread Starter
Drifting
Joined: Mar 2007
Posts: 1,936
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From: Winston-Salem NC
Good article! " Dyno Shootout: Solid Roller Vs. Hydraulic Roller "
Drifting
Joined: Aug 2010
Posts: 1,839
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From: nassau co. new york
this was very interesting as i know very little about cams and lifters.i was distracted however by anne mcdaniels a few times but stayed with it and learned a bit.i wish i knew what i bought.thanks for posting it.
Racer
Joined: Dec 2005
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From: . New Zealand
While it was interesting to see the comparisons, it looks as though the solid roller was still going strong at 6500rpm and it looked like the hydraulic roller had already signed off.
Myself, I would take a solid roller everytime.
Myself, I would take a solid roller everytime.
Thread Starter
Drifting
Joined: Mar 2007
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From: Winston-Salem NC
That's what I got out of it too. The solid roller is stronger, which many here already knew that, but it was informative.
Instructor
Joined: Mar 2009
Posts: 187
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From: WA
Considering the HR gets to the hp faster and with lower maintenance (no valve lashing), and if that engine is on the street at all, it's going to be HR for me.
Pure strip... SR because I'll want the higher rpm's.
Pure strip... SR because I'll want the higher rpm's.
Race Director
Joined: May 2005
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From: Millington Illinois
St. Jude Donor '08-'09
Well the hydraulic roller made 4 Ft LBS more peak torque. The solid roller made 9 more peak hp. The solid roller has more lift which could easilly account for the extra HP. Look at the dyno chart @ 6200 RPM. The hydraulic roller is making 11 more HP and 9 more Ft lbs of torque. The power comes in earlier also with the hydraulic roller. Solid roller takes stronger springs, needs periodic adjustment and lifter inspection and wears valvetrain parts faster. The drop off in power at higher RPM with a hydraulic roller can be extended to a higher RPM with beehive springs and lightweight valvetrain components. The new corvette ZO6 has a hydraulic roller with a 7500 RPM redline using these components. I would like to see this dyno comparison with a set of AFR eliminators that have these upgraded components and comparable lobe lift. Most street cars are not geared correctly to make use of a cam that has the power peak at higher than 6500 RPM and comfortably be driver on the street the majority of the time. For a street engine my choice is a hydraulic roller and building it to get all the power below 6500 RPM. RPM kills motors.
Last edited by 63mako; Jun 22, 2011 at 11:16 PM.
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Well...first I love a good dyno thrash....but.....
First...ZL-1's had solid rollers???
36* of cam timing??
That solid roller was still climbing for sure. Shut down test too early.
Also seems like a bad apples to oranges comparison. A solid roller and a hyd roller with the same .050" duration numbers will not have the same valve events due to lash. The hyd roller was actually *bigger* than the solid roller.
I didn't see the lobe numbers?
Hyd cam gained 45.2 HP from 5000-6400 rpm
Solid cam gained 63.7 and was still climbing.
Who do you think will be pulling hard on who??
Don't get me wrong...a HYD cam can be an excellent performer especially in a smallblock. You can get over 7000 rpm easily with good parts. Much more with *race* type hyd stuff..but at that point it's basically a hyd in name only.
For 6500 RPM stuff they make a lot of sense for a street toy.
JIM
First...ZL-1's had solid rollers???
36* of cam timing??
That solid roller was still climbing for sure. Shut down test too early.
Also seems like a bad apples to oranges comparison. A solid roller and a hyd roller with the same .050" duration numbers will not have the same valve events due to lash. The hyd roller was actually *bigger* than the solid roller.
I didn't see the lobe numbers?
Hyd cam gained 45.2 HP from 5000-6400 rpm
Solid cam gained 63.7 and was still climbing.
Who do you think will be pulling hard on who??
Don't get me wrong...a HYD cam can be an excellent performer especially in a smallblock. You can get over 7000 rpm easily with good parts. Much more with *race* type hyd stuff..but at that point it's basically a hyd in name only.
For 6500 RPM stuff they make a lot of sense for a street toy.
JIM
Team Owner
Joined: Oct 2004
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From: altered state
St. Jude Donor '05
w/427hotrod on a number of things.Since when did the 69ZL1 Camaro come with solid rollers?
Or are they referring to the late ZL1 (Berger)??
SR on the street for me btw. Nothing like em.
some good info in the article but sounded more like a huge ad for Comp
now what they DIDNT mention is if the duration @.050 numbers are the same the solid will have better driveability every time.
Team Owner
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From: Reno Nevada
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kind of a dumb test. It should have been called minimal gains by a higher lift cam with the same duration on our little test heads.
They had to have been using lower total cfm heads to bias the results how ever they wanted the test to come out.
the cams were high duration to top out at such low rpm
They had to have been using lower total cfm heads to bias the results how ever they wanted the test to come out.
the cams were high duration to top out at such low rpm
Race Director
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You're right....those are pretty healthy cams to peak that low. Still not sure where the SR was heading though.
Dart makes decent heads if you get the right ones. I've seen strong results out of them.
JIM
Dart makes decent heads if you get the right ones. I've seen strong results out of them.
JIM
Team Owner
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The article seems to have gone away. So I couldn't find the original numbers. Solid roller valve lash is very small. Like less than .020 these days. One of my motors is actually set at .012
Le Mans Master
Joined: Oct 2000
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From: Austin TX
I guessed it's one of their .016 rollers.
I'm pretty sure:
The lobe numbers were .381 for the HR.
The SR intake was .389 and the exhaust was .399.
Team Owner
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From: Reno Nevada
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They used unstated Dart heads. But they might have been Dart 230 cc Pro 1's 2.08/1.60. 440 ci is big like a big block. Big block heads might have over 300 cc heads with 2.25 intakes and 1.88 exhaust
Race Director
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I did that test a couple of years ago on a 555" pump gas motor. .720" hyd roller (1.8 intake rockers). Tested hyd rollers and then dropped solid rollers on same cam with .002" lash. Made about 11 more HP at the 6300 rpm peak and almost identical TQ down low. But past peak, at 6500 RPM the solid lifters were up about 20HP and of course kept climbing past 7000 rpm easily. Hanging onto the power is what the solids will help with.
JIM
JIM
