Long valves on W2's with .600 lift?
A recap and open items
flows
"When discussing flow and lift a few years ago with Mike Jones @ Jones Cams he suggested a cam with a .565 lift as I recall. This morning Mike S., who flowed my head, told me to stay at .600 or less. Said .565-.570 is what he'd recommend. After so many years of just using a cam based on experience and a recommendation or two I can see where I used a bunch of them that were way too big for the heads I ran."
Yellow rose commented on the flows
Making the ports square is a nasty job. BTDT. The results are certainly worth the effort if you need the cross section area. (I like to keep the velocity up for off the corners)
I'd disagree with the lift that low. I'm not nearly as concerned with the flow stall or even break over. I'm betting if you put the intake manifold on and flow it, the flow will be lower, but much less turbulent.
Also, the argument can be made that flowing the port at higher valve lifts at 28 inches (or higher) may not be as telling as one may think. I'm all for running the test pressure as high as you can, and doing what you can to increase flow at those pressures, or atleast reduce the turbulence/noise, but...I'm not so sure that the port sees that pressure drop at higher valve lifts.
Maybe the port only sees 22 inches above .400 lift (pulling numbers out of my hat here but you get the point) and at that pressure drop, maybe the port isn't nearLy as bad as it looks at 28 inches. We do know that at overlap and the low lift at that point that you can get a pressure drop of near 100 inches or maybe even more. One reason why I think a 50 degree seat (or even steeper) may look bad at 28 inches, but when you crank the test pressure up it looks much better than flatter seat angles.
One last thing...when you flow average verses lift, you'll see that higher net lifts gain you more time at higher flow rates.
This was a HUGE issue I had with Brookshire. He was dead set on .640 gross lift on my W2 stuff. I made more power when I changed cams and on that stuff I ended up at just under .700 lift net. With the same heads. So I wouldn't base my lift requirements just on flow at 28 inches alone.
end yr comments
mbaird posted I would go .650+ so that the valves spend more time at .600 which is where your power is made."
Circle track may have a whole different set of parameters and challenges."
IMHO this might conflict with the reliable necessity- YOUR CALL
Krooser needs a reliable build,
he does not plan or a max rev/ max power build "I want to run about 7200 rpm " 7200 rpm because I can't afford to spin it faster.
his pistons are just arriving so he can still screw with CR --Randy@RaceTec
years ago Mike Jones said there were "no good cores for SBM flat tappet" Still true?
are there any now?
Do we need to consider nitriding
or new tool steel cores?
Krooser mentions looking at the solid body (no dumbell) Crower/ comp style lifter with a .024 oil hole- any better choices Do we need DLC coating?
Krooser's W2 econo heads have the rocker stands milled off. T&D rockers 1.5 rockers IDK if rockers bushed
They sell rocker stand spacers that allow fine tuning the rocker stands to get the rocker tip sweep correct. he will set mid lift correctly
Wyrmrider said
since you have to make stands figure out what the best spring to use - usually taller like 2" or Big- block size ( or BBC size) some height where you have choices a
Krooser posted "The other issue with a .650 lift is finding the correct springs that I want to use.
My Crowers that were on this will go to .650 I believe but I want to go to a beehive or conical spring... lighter rate and better spring control at speed.
I still have to work out exactly what I want. "
He is looking at Beehive springs he can get valves for any spring length recommended- what would be the most reliable and provide best valve control?"
Earlier Thinking of PAC 1218X's.
"I'm pretty sure I'm going with PAC 1220 beehive springs... 1.440 diameter at the base". ??? what best with proposed cam?
"Trying to get an installed height of 1.9.
These heads have 1.50 diameter springs right now."
Wyrm writes
what about pac 1220 set up at 2.00 I get 135 seat 360@600 1.445 OD – Lunati box is $10.00
think I found a suitable set of springs. PSI 1115L which will take a .650 lift...have a 1.9XX installed height ??? IDK
Here's what Mike Jones recommend.
Cam# Chr360, M74375-77370-106
250/255 @.050"
.375"/.370" Lobe Lift
106 LSA
Price: $263.32
Lifter# J904MH
.904" Mech F.T. lifter w/.024" oiling hole in lifter face
Price: $168.36
If you want to run a beehive, I recommend the PAC 1235
PAC-1235 Hemi 5.7L, 6.1L 0.600 Lift Drop-In Ovate Wire Beehive - 1200 Series Beehive - Valve Springs - Products | PAC Racing Springs
yr also observes that the springs dance around so what for spring seats?
Krooser had 2.02/1.60 Manley Race Flow but ditching the Manley Race Flow valves to heavy (for sale?)
he has a 5.140 the other a 5.165. to mock up
"The 8mm stem Magnum valve is 120 grams. The 11/32 stem is 125 grams while the 3/8 stem is 140.
I thought the 8mm would be much lighter...I'd use those but the retainers and locks are more expensive than the others by a bunch...
at least in the tool steel or forged steel lines.
Valve Keepers? Bead or Square? Super 7? 3/8 retainers and jumbo keepers?
Bead offers approximately 30-percent more valve-stem life over other designs.
Competition Products?
yr said BTW, I had to use 3/8-7/16 double taper thick wall Smith Brothers pushrods to get it done. I also had some very nice pushrods made by Walt and Pat Austin. Those were double taper as well.
YR and I are suggesting double taper 7/16 pushrods I'd use ford balls and cups- TBD would you suggest lubing the cups ann balls throught the pushrods?
"I'll likely use the biggest pushrods I can fit "
Manifold
4-6" of the runners matched to the heads but no work has been done to the plenum... Mopar M-1.
