Cool I'm going to do that tomorrow and recheck the clearances.. I don't have pushrods but I have shims so this should work. I'll report back if it that is the issue.
... As far as the flat spot @ wot is not valve float, it'll just flat fall on its face and never pick up. ... THEN Check your pressure too. And the 1.7s give you more lift which gives you more top end. More duration gives you bottom end and more LSA gives you more of both basically.
I like simplifications that help general understanding. Unfortunately, except for the valve float statement, the above is not correct. Cam and lifter dymamics are more complicated than this.
Lift - (Changed by lobe shape or rocker arm ratio) - Helps more air in and out across the power band IF the heads flow better at the higher lift, if the springs do not bind, and if there is enough piston to valve clearance.
Duration - (not significantly affected by rocker arm ratio) - allows more time for the air to flow in or out and helps more at high RPM due to the valve timing overlap.
LSA Lobe Separation Angle - this combined with duration affects idle quality and can move the torque band in the RPM range. If you like a lopey idle, you want overlap, but your computer will measure incoming air better and idle better with a wider LSA and less overlap.
Opening and closing rate - The faster, the better IF your valve train can handle it. Ideally, you want the valve at peak flow lift as quickly and ask long as possible. But if things move too fast, the lifter may not stay on the lobe, and the valve may float or even bounce. Noise and loss of power are just two consequences of this problem. If it gets bad enough, things break.
SO- leaving the 1.7 rocker on the exhaust side may help the flow on the exhaust port side. It is not unusual for Fords to need this help more than on the better flowing intake port.
The question I have is why were things noisy with 1.7 lifters? You do not list what cam you are using and what valve springs, but if there is clearance and things are lined up (AKA correct Geometry and clearance), 1.7's should not be noisier than stock stamped lifters.
Not going to get in the middle of this **** match.
Barney is a troll that mostly googles crap and posts tons of wrong and/or states the obvious. He is hated on the Corral and sad to say he found his way here.
Plenty have done it with success. How much are you preloading the lifter when you install the rockers? Too much preload can make them noisy.Here's another question (hehe)... if/when I open up the valve covers again, I was considering putting the 1.7 rollers back on... but just on the exhaust side, leaving the stock rockers on the intake. Is this a great idea or not ?
hello;Here's another question (hehe)... if/when I open up the valve covers again, I was considering putting the 1.7 rollers back on... but just on the exhaust side, leaving the stock rockers on the intake. Is this a great idea or not ?
lol, well lets see, i have 8 "likes" here after being here a short time.
i have several "friends" on the corral and one just posted a friend request to me the other day. there are a few a holes on the corral and if you are there, your quote above proves that you are obviously one of them.
Glad you got it. Seems the preload was the issue
Yes I saw comments eluding to the possibility that the adjustment may be the cause of the running problem in posts 3, 6 and 28.Huhu...I thought I remember someone here saying that a few posts back?
The test in your post wouldn't work, I was pretty clear that I hadn't run these heads with the 1.6s yet. Even so, I'd rather measure turns (like i did) instead of putting something on and hoping it would work, already learned my lesson on doing that here.Yes I saw comments eluding to the possibility that the adjustment may be the cause of the running problem in posts 3, 6 and 28.
the test suggested in post 28 would have definitively determined the excessive preload as the cause.
Yes I saw comments eluding to the possibility that the adjustment may be the cause of the running problem in posts 3, 6 and 28.
the test suggested in post 28 would have definitively determined the excessive preload as the cause.
The test in your post wouldn't work, I was pretty clear that I hadn't run these heads with the 1.6s yet. Even so, I'd rather measure turns (like i did) instead of putting something on and hoping it would work, already learned my lesson on doing that here.
sure it would have. it would have determined that your problem was due to improper preload which is exactly what you found out when you shimmed your 1.6. rockers. its a simple deductive test procedure.The test in your post wouldn't work, I was pretty clear that I hadn't run these heads with the 1.6s yet. Even so, I'd rather measure turns (like i did) instead of putting something on and hoping it would work, already learned my lesson on doing that here.