1.8 Rockers
1.8 Rockers So I have stock 853 heads and was thinking about putting 1.8 rockers on. Has anyone done this and if so did you gain anything? Also what rockers did you use? Thanks
What ones are you concidering? What cam and valve springs do you have? You need to make sure your not going to coil bind your springs if they are stock!
SLP makes 1.85s..
Comp makes Gold 1.82s, and 1.85 Pro Magnums.
SLP makes 1.85s..
Comp makes Gold 1.82s, and 1.85 Pro Magnums.
Ive also seen the Ultra Golds pick up 12rwhp on a guys car I know. I havent seen anying in person with teh SLPs but they look like a stock body with a nice trunion. Im sure they work very well.
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If you are planning on EVER doing a cam I would just do a trunion upgrade to the stock rockers for 230$ and keep the stock geometry. Changing the ratio is really not the ideal way to get more power.
For a rocker like the slp, it would have the exact same same geometry, until you passed the previous max lift point.
Best solution however is to use a cam designed for a higher rocker ratio, since most good cams do take the rocker ratio into account on how the lobe creates the lift, and how fast. A high ratio on an already aggressively lifted cam could cause stability issues and valve float, while a cam designed for higher ratios might be more stable than a nearly identical cam made for lower ratios.
Cams designed for higher ratios (with same net valve lift) can usually use a larger base circle, which can help stabilize the valvetrain and increase roller lifter life.
Not saying the trunion upgrade isn't a good idea, but on most higher ratio rockers, the geometry doesn't change any more so than using the cam to get more lift. The pushrod cup gets moved slightly closer to the fulcrum, providing more valve lift for same pushrod movement.
For a rocker like the slp, it would have the exact same same geometry, until you passed the previous max lift point.
Best solution however is to use a cam designed for a higher rocker ratio, since most good cams do take the rocker ratio into account on how the lobe creates the lift, and how fast. A high ratio on an already aggressively lifted cam could cause stability issues and valve float, while a cam designed for higher ratios might be more stable than a nearly identical cam made for lower ratios.
Cams designed for higher ratios (with same net valve lift) can usually use a larger base circle, which can help stabilize the valvetrain and increase roller lifter life.
For a rocker like the slp, it would have the exact same same geometry, until you passed the previous max lift point.
Best solution however is to use a cam designed for a higher rocker ratio, since most good cams do take the rocker ratio into account on how the lobe creates the lift, and how fast. A high ratio on an already aggressively lifted cam could cause stability issues and valve float, while a cam designed for higher ratios might be more stable than a nearly identical cam made for lower ratios.
Cams designed for higher ratios (with same net valve lift) can usually use a larger base circle, which can help stabilize the valvetrain and increase roller lifter life.
You are correct, but I was stating it merely for a reason that you pretty much touched on as well. Lots of people dont realize that certain cams have a more aggressive design and probably will cause valve float if paired with a rocker really designed to go with a stock or close to stock camshaft. Just making awareness is all. It moves geometry, but on the other end of the pushrod.
Not saying the trunion upgrade isn't a good idea, but on most higher ratio rockers, the geometry doesn't change any more so than using the cam to get more lift. The pushrod cup gets moved slightly closer to the fulcrum, providing more valve lift for same pushrod movement.
