as anyone up graded to 1.65 from 1.60 rocker and had a diffence made in performance? it would give about .023 lift also is the push rod lenth need to be changed??
The problem is you can't guess at a potential improvement unless you know how far from ideal the cam and heads work together. If the heads have greater flow potential at higher lifts than the cam can offer at 1.6, then increasing the lift might give an improvement, however small. If the head flow has already topped out with 1.6 rockers, an increase may do nothing for you. As far as pushrods go, I would expect the adjustability of a roller rocker can compensate for a switch in ratio like this unless the pushrods are already so short/so long that the adjustability is already at one end of its limit or the other. Devon
If you are running Stg 2's, then go with 1.7's. They can use the lift since they usually pick up flow to .700+ lift. It will take less duration to get good lift out of the cam. HP is all about airflow so let it flow!:3gears:
hmmmm... 1.70 rockers fit the stage 2 heads I only seen they list for stage 3+4 Jeff as a set of 1.70 rockers I saw them I thought he said he had to work the push rod hole to make them work????there wider....on the head flow my flow sheet only goes to .600 lift, just looking at other options need more power!
is the flow increasing all the way to .6? if so, you might still be going up afterwards. I would like to know if 1.7's fit stage 2's also, i might consider them thanks
I would check to see what it would take to do the conversion. There is a slight difference but it may just take a little shimming on the sides of the rockers one way or another. Yo may be able to "re-body" your 1.6 setup for cheeper than a new set. o No:
Sounds like it would be less expensive to re-cam the engine, unless we're talking about a roller cam. Devon
Pretty sure you can just order 1.7's from TA for the stg. 2. Year ago I bought a set for my TE's, just bolt them on and go! Yes, a cam would be cheaper...... Gary G.
Right, you can re-grind a cam with more lift but you will only get so much with a flat tappet. That is where the 1.7 ratio comes into play. It will take a .630" lift cam and turn it into a .669" lift without adding duration to get it. Plus it will give you more "area" with the same profile since you are getting a little more lift thru the entire duration of the cam's profile.
Now by increasing the lift only does the power range the cam increase as much if just going to a bigger cam....I wouldn't want to have to shift at 7000 right know the seems to like 6400...
Maybe 100rpm but it should stay about the same. It also allows you to run a better cam if you should ever get one custom made.:TU:
