How to decide on which valve spring

[Mach1]

Well then ill give them a shot and see how it goes, any lifter better then others?

Morels are good

[91CoupeMike]

Morels are good

Didn't know what those were, and damn those are nice, do I really need to go link bar? I guess it's something I could use it in an sbf build from here on out right?

$380 is what came up for the 5323 street lifters 62/6500 rpm max. In your opinion do I need more rpm capability?

At what point does the factory block give out, rpm wise? I was told over 6500 isn't wise, but I have a good balancer and a new flywheel, non sfi, which is "sketchy"

[Mach1]

Didn't know what those were, and damn those are nice, do I really need to go link bar? I guess it's something I could use it in an sbf build from here on out right?

$380 is what came up for the 5323 street lifters 62/6500 rpm max. In your opinion do I need more rpm capability?

At what point does the factory block give out, rpm wise? I was told over 6500 isn't wise, but I have a good balancer and a new flywheel, non sfi, which is "sketchy"

I think you would be ok with a stock lifter or the ford racing "upgraded" lifter for your application, I would turn 6500 max with your setup, keep the valve train as light as possible.

[91CoupeMike]

I think you would be ok with a stock lifter or the ford racing "upgraded" lifter for your application, I would turn 6500 max with your setup, keep the valve train as light as possible.

Thank you, I was getting googley eyed window shopping on those other ones.

So Anderson springs, new stock style lifters, I already have Hardned push rods.

Anything I'm missing?

Could that be why my car will fall out sometimes and then run like ass? A collapsing lifter/s?

[broke again]

there is very little to go wrong inside a stock lifter. i doubt that is your problem and i wouldnt waste the money buying a different set.

[91CoupeMike]

there is very little to go wrong inside a stock lifter. i doubt that is your problem and i wouldnt waste the money buying a different set.

I had that stalling issue and running like ass happen once Before over a year ago. It happened while racing just like now. It was making a lifter noise then.

But I agree with you, other then I didn't take apart my lifters and clean them while they were out of them car, so it could be an issue.

Just connecting the dots and seeing what makes the most sense.

[jyro]

last year I went through the motor

I like the quality control they advertise. You ever double check them?

reused the 5 year old springs, they had 135 at the seat. I limit at 6600. stock used lifters, ti retainers 1.625 exhausts and 2.10 intakes, both .200 longer on (very old and still cracked) TFS/R heads, Scorpion 7/16 rockers, 8.4 5/16 .080 pushrods.
I tried to upgrade to 3/8 pushrods but the tfs/r heads have too much port in the way for it to work.

I have the 8.4 x 3/8 pushrods and tfs/r 3/8's guide plates for sale cheap

[91CoupeMike]

What's the etiquette on when to go 3/8ths pushrods? Seems like the 5/16ths should go pretty far. My heads have the guide plates, so that's a plus.

[Mach1]

A good 5/16 PR should be fine at your spring pressures, I'd go to 3/8 in a solid roller app.
If you go with a conventional spring a Ti retainer would help keep the weight down where it counts, but they are $$$

[91CoupeMike]

A good 5/16 PR should be fine at your spring pressures, I'd go to 3/8 in a solid roller app.
If you go with a conventional spring a Ti retainer would help keep the weight down where it counts, but they are $$$

I'm torn between PAC and AFM.

[2cammer97]

Hey Mike, for what it's worth here's what I'm using on my '92:

http://www.summitracing.com/parts/tfs-2500100

Granted, I'm using a smallish cam. It's the Crane 2031 (214/220 .513/.529 with a 112 LSA) but the springs are good to .550 lift. How big is your cam?

The only bad thing on the TFS spring kit is the Teflon valve seals are junk. Use factory Fel-Pro valve seals from O'Reilly.

Did you get that crank balancer installed?

Marcus

[85turbocoupe]

I'm torn between PAC and AFM.

I have a set of PAC1518s with just dyno time ill let go for $150.

[jyro]

shortest and largest diameter you can fit is the stiffest

What's the etiquette on when to go 3/8ths pushrods? Seems like the 5/16ths should go pretty far. My heads have the guide plates, so that's a plus.

What is pushrod flex and how does it affect power and durability?
The pushrod deflects or flexes upon valve opening and then again just prior to valve closing. As the cam tries to move the valvetrain to open the valve, it has the weight of the valvetrain against it and in the case of the exhaust valve, cylinder pressure also. Upon valve closing, the cam is trying to slow the valvetrain down. So on valve opening and valve closing the pushrod flexes and as rpm increases it gets worse. Here’s how it effects rpm, power and durability;

Rpm is reduced when the pushrod flexes, and then rebounds like a pole vault. It throws the rocker and valve out of control. As rpm increases, the more the pushrod flexes, the more out of control the valvetrain becomes and the more valve "float" or "bounce" to the point that the engine rpm no longer increases.

Power is naturally affected by the loss of valvetrain control at rpm, but something else happens. Remember the engine responds to valve timing not cam timing. Even if the valvetrain stays in control. When the pushrod flexes upon valve opening and valve closing, the valve opens later and closes earlier. The engine "sees" less valve open time (like a smaller duration cam) and as rpm increases it gets worse. Loosing 6 to 8 degrees of valve timing is not unheard of!

Durability is affected when the valvetrain parts are "thrown" out of control by the rebounding pushrod. When this happens the valvetrain parts are jerked apart from each other, and then slammed back against each other by the valve spring pressure. This "slam" can break parts anyplace in the valvetrain and at the very least break the lubricating oil film causing excessive wear. All of the above can happen without a pushrod failure!

http://www.scorpionracingproducts.com/faq/?p=15

there is a spintron video of pushrod flex somewhere but I can't find it

[91CoupeMike]

Spent a few hours last night watching darttv on YouTube. They have some neat videos from an engine masters class or seminar.

It was enough to make me lean towards a lighter ls1 beehive over the stiffer afm springs, also learned that you want more cam and less rocker arm.

[Mach1]

It was enough to make me lean towards a lighter ls1 beehive over the stiffer afm springs, also learned that you want more cam and less rocker arm.

Good choice