Stock rockers +trunion or Roller rockers?
#1
Stock rockers +trunion or Roller rockers?
If I understand it correctly, the reason for roller rockers is to keep the valves from moving due to the stock rocker arm sliding on the top of the spring vs a roller rocker rolling across the top of the spring..... is that pretty accurate?
I am going to be getting heads next year, and I am looking for inputs on replacing rockers with stock rockers with a trunion upgrade or going with roller rockers like Harland Sharp 1.7 or Scorpion 1.7.
I am going to be getting heads next year, and I am looking for inputs on replacing rockers with stock rockers with a trunion upgrade or going with roller rockers like Harland Sharp 1.7 or Scorpion 1.7.
#2
TECH Senior Member
How much lift on the cam to be used? Generally, if it's .600 or over, roller tip rockers are a good idea, but less than that, not really necessary. Then just do a trunnion bushing upgrade.
#4
11 Second Club
iTrader: (2)
valves ARE supposed to rotate in the guides during up/down movement so as to keep the valve job concentric
Roller rockers are traditionally very heavy at the valve because of the amount of material needed since aluminum is
generally such a weak alloy..........Yella Terra being the accepted premium brand
Hollow valves AND titanium retainers will help plus bad *** valve springs are a MUST
Roller rockers are traditionally very heavy at the valve because of the amount of material needed since aluminum is
generally such a weak alloy..........Yella Terra being the accepted premium brand
Hollow valves AND titanium retainers will help plus bad *** valve springs are a MUST
Last edited by A.R. Shale Targa; 09-28-2017 at 02:13 PM.
#6
valves ARE supposed to rotate in the guides during up/down movement so as to keep the valve job concentric
Roller rockers are traditionally very heavy at the valve because of the amount of material needed since aluminum is
generally such a weak alloy..........Yella Terra being the accepted premium brand
Hollow valves AND titanium retainers will help plus bad *** valve springs are a MUST
Roller rockers are traditionally very heavy at the valve because of the amount of material needed since aluminum is
generally such a weak alloy..........Yella Terra being the accepted premium brand
Hollow valves AND titanium retainers will help plus bad *** valve springs are a MUST
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#9
TECH Senior Member
iTrader: (4)
Roller rockers can provide a narrower wipe pattern if the time is taken to correctly set them up. Many skip this step. The rollers do not roll, they slide. The smaller wipe pattern is what reduces the valve guide wear. The stock rockers, due to their geometric design, won't provide a narrow wipe pattern. So a wider wipe along with stiffer springs accelerates valve guide wear. Powdered metal wears slower than bronze.
Focus on the total setup. Larger OD pushrods help was well. Hardened pushrods are not stiffer.
Focus on the total setup. Larger OD pushrods help was well. Hardened pushrods are not stiffer.
#14
I went with the comp trunion upgrade. You have to be honest with yourself on your build and be able to draw the line when enough is enough $$.
If it helps the trunion install was really simple with a regular bench vice.
If it helps the trunion install was really simple with a regular bench vice.
#16
Roller rockers can provide a narrower wipe pattern if the time is taken to correctly set them up. Many skip this step. The rollers do not roll, they slide. The smaller wipe pattern is what reduces the valve guide wear. The stock rockers, due to their geometric design, won't provide a narrow wipe pattern. So a wider wipe along with stiffer springs accelerates valve guide wear. Powdered metal wears slower than bronze.
Focus on the total setup. Larger OD pushrods help was well. Hardened pushrods are not stiffer.
Focus on the total setup. Larger OD pushrods help was well. Hardened pushrods are not stiffer.
When you say "wipe pattern" does that mean the surface area of the retainer that the rocker slides across?
#17
TECH Senior Member
How could it roll across the retainer when the valve tip is ABOVE the retainer. IF it rolled over the retainer, the valve would pop loose the first time it happened. You might want to read up on how valves are kept in the head....
#18
Since I do not feel comfortable swapping out rocker arm trunions, I am going to buy new rockers when I get the heads done.
Scorpion roller rockers claim 100% stock replacement and lifetime warranty. About $150 more than new stock rockers with trunion upgrade.
Scorpion roller rockers claim 100% stock replacement and lifetime warranty. About $150 more than new stock rockers with trunion upgrade.