roller rockers
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
Re: roller rockers (1990CORVETTE)
What if any other mods do you have?
On an LT1 car 1.6 rockers are typically good for around 10 horsepower at the wheels. I would imagine a TPI would respond similarly. It might not gain as much at the peak because of the intake restricions, but it should still see a healthy increase in mid RPM power.
On an LT1 car 1.6 rockers are typically good for around 10 horsepower at the wheels. I would imagine a TPI would respond similarly. It might not gain as much at the peak because of the intake restricions, but it should still see a healthy increase in mid RPM power.
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
Re: roller rockers (LT-4 CE)
Are people seeing similar gains going to a 1.7 on the LT-4?
Going to 1.7 rockers on an LT4 would take you from .476 / .479 lift to .506 / .509 respectively. The overall lift is still less than what you would have with an LT4 Hot Cam, so you could easily do it on stock springs. There would probably be some power to be had, maybe 10-20 horses tops.
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Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
Re: roller rockers (montie98)
In short full roller rockers are effective and roller tip rockers are not.
That's not completely fair, but it is true to an extent. A roller tip rocker is just what it sounds like. It's basically a stock rocker with a roller tip to depress the valve. It's an alright theory, and it helps some, but it's really only a marginal improvement.
Full roller rockers have roller tips AND roller bearings at the rocker fulcrum. This is where most of the frictional gains are realized.
That's not completely fair, but it is true to an extent. A roller tip rocker is just what it sounds like. It's basically a stock rocker with a roller tip to depress the valve. It's an alright theory, and it helps some, but it's really only a marginal improvement.
Full roller rockers have roller tips AND roller bearings at the rocker fulcrum. This is where most of the frictional gains are realized.
Drifting
Joined: Nov 2001
Posts: 1,783
Likes: 2
From: Latham NY
Re: roller rockers (montie98)
I was told that they would not work on 85s but ok on late 86 and on
Drifting
Joined: Jun 2002
Posts: 1,305
Likes: 11
From: Savannah Ga.
Re: roller rockers (Bluevette85)
quote:
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Are people seeing similar gains going to a 1.7 on the LT-4?
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curious me. some body tell me more about 1.7.......are they noisier than 1.6..straight bolt ons ....do you use stock valve covers minus drip tab... :smash: :smash: I want to know
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Are people seeing similar gains going to a 1.7 on the LT-4?
--------------------------------------------------------------------------------
curious me. some body tell me more about 1.7.......are they noisier than 1.6..straight bolt ons ....do you use stock valve covers minus drip tab... :smash: :smash: I want to know
Le Mans Master
Joined: Jun 2003
Posts: 7,857
Likes: 2
From: Ignore this post
St. Jude Donor '03
Re: roller rockers (Bluevette85)
I was told that they would not work on 85s but ok on late 86 and on
You were given the wrong information. You can use 1.6RR but you have to cut the drip tabs inside the valve covers off and crush the baffles a little. I would replace the springs and valve seals while it's apart. I used Proform self aligning # 66915 from Summit.
You were given the wrong information. You can use 1.6RR but you have to cut the drip tabs inside the valve covers off and crush the baffles a little. I would replace the springs and valve seals while it's apart. I used Proform self aligning # 66915 from Summit.
Instructor
Joined: Aug 2003
Posts: 163
Likes: 0
From: Glendale Az
Re: roller rockers (cheap vet)
They will distroy push rods. Self aligning roller rockers were designed for center bolt valve cover without push rod guide plates. If you use self aligning rockers with guide plates and do not clearance the plates they will rub. An 85 has guide plates and plenty of room for regular roller rockers. Also, roller tip rockers were first developed to try to stop the premature wear of SBC valve guides by allowing the tip to move freely across the valve stem. :chevy
Drifting
Joined: Dec 2001
Posts: 1,419
Likes: 0
From: Mississauga Ont
Re: roller rockers (69vetteracer)
^so you would recomment regular 1.6 roller rockers on an 85? and just take the bullet and adjust every so often?
i was looking at crane cams blazer extruded aluminum roller rockers
i was looking at crane cams blazer extruded aluminum roller rockers
Instructor
Joined: Aug 2003
Posts: 163
Likes: 0
From: Glendale Az
Re: roller rockers (Bilyk)
Yes I would, I install several sets a month. The only thing to watch for is your springs. The higher the ratio, the more the spring gets compressed and old springs sometimes cannot take that. An old trick was to run 1.5 on the exhaust and 1.6 on the intake, or even 1.7 on the intake. Hopefully, most of the gas is burned in the cylinder and you do not need 1.6 to evacuate the cylinder. That would save stock exhaust springs. The interval of adjustment can be pushed futher apart if you file the top of the rocker studs flat. This will allow the jam nut on the poly lock to seat better. :chevy