oldeskewltoy said:
Valve spring specs are finally in....
Now the discussion... how much spring is too much spring???? We want enough spring to follow the cam upto 6000 rpm, yet we need to be careful - as finding extra camshaft cores for this would be nearly impossible.
It is interesting to note - OST-089 is a 2TC head that might just hold the clue/answer. This is a single spring, and we need to keep doubles, but something around 85-95#s on the seat, with no more then 180#s on the nose should follow the cam, and not wear the cam lobe
In our case we do need to keep an inner valve spring as that spring holds the valve seal in place.
More to come......
And it might be the solution to the issue.....
The Problem: finding a valve spring, or springs to raise seat and nose pressures enough, without going crazy with extreme pressures. The dimensions of the main spring seems to be the issue. 1.285/ .935 - 1.650 (OD/ID - installed height) Not knowing the V8 world like I do multi valve heads... Some Pontiac springs have some similar dimensions - but with seat and nose pressures that are unacceptable(camshaft destroying), and many other V8 spring just don't fit our requirements.
What Ted wants (Ted is the mind behind Portland Engine Rebuilders) is another 25#-30# on the seat and another #30-#40 pounds on the nose.
And now to the "it" in, "And it might be the solution to the issue....." The inner spring.
Dimensionally the inner spring is very similar to motorcycle springs, except our spring is quite wimpy. As Ted and I agree - the wimpy inner springs are most likely there to hold the seal in place.
Our next task is to measure the inner spring alone, and measure its pressure @ 1.640"(do to stepped retainer), and measure the pressures on the nose, and then see if one of the motorcycle valve springs will add the pressures we need without going overboard......
more to come....