titanium vs. stainless
#11
One thing to consider is the seat material. Stainless will beat up they copper seats in short order, especially at your RPM. As far as the pushrods, the biggest that will fit is the best. Not an area to be concerned about weight.
#13
Senior Member
RACING JUNKIE
Join Date: May 2006
Posts: 2,044
Originally Posted by vegabond
I twist my motor that high because it's an old cup motor (4.165 X 3.260) doesn't make any power till 6500. Good point on the seats Mark. Thanks for the reply Guy's.
#14
Originally Posted by doorracer
Originally Posted by Tod74
Originally Posted by oldandtired
Weight combined with strength. It's another level you can buy into.
Of course I will mention the obvious - run smaller stem (titanium) valves, with titanium retainers, a rev kit and smaller OD pushrods.
This is the diet package for dependibility and high RPM's.
Dave
Of course I will mention the obvious - run smaller stem (titanium) valves, with titanium retainers, a rev kit and smaller OD pushrods.
This is the diet package for dependibility and high RPM's.
Dave
I don't care if I give up some weight... big pushrods help more than they could hurt...and the weight of the pushrod isn't really a factor since it isn't controlled by the spring...not directly.
Curtis
I perfer to leave the big old 7/16 pushrods on the bench and get Manton 3/8 x .083 wall. Even with upper end restricters, the oil will become moving weight. But then I'm not running 1"+ lift, 1,000 open pressure springs and 10,000rpm!
Dave
#15
Senior Member
MASTER BUILDER
Join Date: Sep 2005
Posts: 134
I have an 18 deg sbc with a 3.800 stroke and it likes 8000 rpm a lot,a 3.260 stroke 18 deg I think titanium in&ex would be a good thing.About pushrods,the more ratio the rocker arm has the harder it is for the pushrod to open the valve,and the easier it is for the spring to return it.So when going to higher rocker arms stronger pushrods is something to think about,lower ratio might like lighter ones.Bill.
#16
On the bigger valves you really need the light weight of the Ti. The heavy stainless valves will actually bounce off the seat when you get around the 7,200+ mark. Lightweight valves also take a lot of stress off the valve springs. At least use Ti intake valves. It is $ well spent.