1.7 roller rockers on stock engine
06-07-2008, 08:15 AM
#1
2nd Gear Member
Thread Starter
Join Date: Oct 2007
Location: NJ
Posts: 370
1.7 roller rockers on stock engine
im pulling my engine to do an oil pan gasket andi wanna do a few things while is out, what would the gains be on puting roller rockers on a stock 87 5.0 should i go with 1.7 or 1.6. any other sudjestions (moneys tight tho)
06-07-2008, 11:32 AM
#4
3rd Gear Member
Join Date: Apr 2008
Location:
Posts: 939
RE: 1.7 roller rockers on stock engine
Adding roller rockers will do absolutly nothing for you. You won't see/feel any change at all.
Going from a 1.6 to a 1.7 will make a noticable improvement. It adds 2-3* of camshaft duration, and more lift. I'v made that swap and the differance is noticable. The Cobra engine has 1.7 non-roller rockers from the factory. Pick up a set of those for an economical improvement.
Going from a 1.6 to a 1.7 will make a noticable improvement. It adds 2-3* of camshaft duration, and more lift. I'v made that swap and the differance is noticable. The Cobra engine has 1.7 non-roller rockers from the factory. Pick up a set of those for an economical improvement.
06-07-2008, 12:53 PM
#5
6th Gear Member
Join Date: Feb 2006
Location: Howard City, MI
Posts: 5,956
RE: 1.7 roller rockers on stock engine
ORIGINAL: .boB
Adding roller rockers will do absolutly nothing for you. You won't see/feel any change at all.
Going from a 1.6 to a 1.7 will make a noticable improvement. It adds 2-3* of camshaft duration, and more lift. I'v made that swap and the differance is noticable. The Cobra engine has 1.7 non-roller rockers from the factory. Pick up a set of those for an economical improvement.
Adding roller rockers will do absolutly nothing for you. You won't see/feel any change at all.
Going from a 1.6 to a 1.7 will make a noticable improvement. It adds 2-3* of camshaft duration, and more lift. I'v made that swap and the differance is noticable. The Cobra engine has 1.7 non-roller rockers from the factory. Pick up a set of those for an economical improvement.
They will give you more lift, about .471" total lift from about .444".
They will net you about 10 rwh (that comes from https://mustangforums.com/m_4459375/tm.htm)
06-07-2008, 01:56 PM
#6
1st Gear Member
Join Date: Sep 2007
Posts: 86
RE: 1.7 roller rockers on stock engine
ORIGINAL: 5.0stanger
It won't add any durration...none.The cam will still open and close the valves at the same time, they will just open/close faster and higher.
They will give you more lift, about .471" total lift from about .444".
They will net you about 10 rwh (that comes from https://mustangforums.com/m_4459375/tm.htm)
ORIGINAL: .boB
Adding roller rockers will do absolutly nothing for you. You won't see/feel any change at all.
Going from a 1.6 to a 1.7 will make a noticable improvement. It adds 2-3* of camshaft duration, and more lift. I'v made that swap and the differance is noticable. The Cobra engine has 1.7 non-roller rockers from the factory. Pick up a set of those for an economical improvement.
Adding roller rockers will do absolutly nothing for you. You won't see/feel any change at all.
Going from a 1.6 to a 1.7 will make a noticable improvement. It adds 2-3* of camshaft duration, and more lift. I'v made that swap and the differance is noticable. The Cobra engine has 1.7 non-roller rockers from the factory. Pick up a set of those for an economical improvement.
They will give you more lift, about .471" total lift from about .444".
They will net you about 10 rwh (that comes from https://mustangforums.com/m_4459375/tm.htm)
06-07-2008, 02:13 PM
#7
3rd Gear Member
Join Date: Apr 2008
Location:
Posts: 939
RE: 1.7 roller rockers on stock engine
ORIGINAL: 5.0stanger
It won't add any durration...none.The cam will still open and close the valves at the same time, they will just open/close faster and higher.
It won't add any durration...none.The cam will still open and close the valves at the same time, they will just open/close faster and higher.
06-07-2008, 02:36 PM
#8
3rd Gear Member
Join Date: Sep 2007
Location: Florida
Posts: 761
RE: 1.7 roller rockers on stock engine
ORIGINAL: .boB
The Cobra engine has 1.7 non-roller rockers from the factory. Pick up a set of those for an economical improvement.
The Cobra engine has 1.7 non-roller rockers from the factory. Pick up a set of those for an economical improvement.
06-08-2008, 11:44 AM
#10
1st Gear Member
Join Date: Sep 2007
Posts: 86
RE: 1.7 roller rockers on stock engine
ORIGINAL: .boB
Not exactly true. Effective duration and valve action is generally accepted to start at .050" of valve lift. A higher ratio rocker arm will obtain that amount of valve lift sooner, therefore providing more duration. It works.
Not exactly true. Effective duration and valve action is generally accepted to start at .050" of valve lift. A higher ratio rocker arm will obtain that amount of valve lift sooner, therefore providing more duration. It works.