PHP has a group under Vizard building a budget big block. 675hp 482. A two part article, the first part covered the bottom end. In it, they gave themselves kudos for their valve spring selection.

The cam is Comp XE Street Roller with a 1.7 rocker. 254/260 @ .050. Stainless 2.3" intake...not light. Just under .65 lift net of lash. They used a 'new' Beehive designed for 'big blocks'.

What was it? 26095? Shimmed it would have the .675" travel they mentioned. 26055? Can't support that much lift. Ditto 26120.

What did they use? And can a little low pressure beehive handle that heavy valve on a solid roller with a 1.7 rocker?

 

The big block beehive is the 26120

 

Yep thats the old 26120 alrighty!

 

How can it be the 26120? That spring has an installed height of 1.9 and a coil bind of 1.230, .67" to coil bind. They would have to be running with in .020" of coil bind. I thought .050-.060 was the minimum.

 

David,

Don't believe everything you read!

 

Which thing did you have in mind? How close to coil bind to run?

The $$$ they spec'd, $700 for springs, retainers, keepers, pushrods, and rockers wouldn't cover the 26095 springs and retainers.

 

26120s don't coil bind where they said for one.

 

#1. Where DO they coil bind then ;-)

#2. .060" to coil bind is getting to be an eternity anymore.

Bret

 

Please elaborate...

 

Bret,

1.190 usually but all lots could be different. Even at .650 lift you'd be around .060 away from bind.

 

Also David don't assume your rocker ratios are right and that there is no deflection although in a hydraulic roller there will be less. I've had 1.6s test like 1.70+ before and vice versa.

 

Deflection is speed dependent. Even on a stiff system, it will be mild at idle.

Regardless of rocker ratio, how close to coil bind will you run?

 

Think out of the box. Imagine "coil bind" as more of a friend than an enemy. Does anything come to mind?

 

Bent pushrods...

 

That depends on the spring and how long you want it too last and what the spintron says and the dyno too and if you are going for a certain amount of loft etc. You can run drag race stuff pretty close to coil bind and it sometimes helps damp some types of problems. I would say .050-.070 is used a lot but it all depends. Some people run 10,000 rpm stuff .100 from coil bind with no problems. It always depends.

 

its only your friend if your opponents engine is exploding. could you elaborate a tad bit more than that? with beehives you would think that when it binds itd want to somehow spread outwards like an arch does when the anchors give way. just a guess btw..

 

Fine...but to get the lift you indicated you would need to run even below that. Comp Specs it at 1.88 installed height. That's 1.21 or just .020 from coil bind from your coil bind number. And thats with 155# on the seat; fine for a hydraulic lifter, however isn't that a litte soft for a solid roller?

Aren't they playing it a little close to the margin? It was my understanding you wanted to be in the .060-.100 range to avoid the problems of too little (binding and bending) and too much (higher speed harmonics).

Isn't lofting just something to do in a lift restricted class?

 

You don't need to start them at 1.880 and they usually test stiffer than you have read.

OTOH the test you are talking to might be different than what I was thinking of because I thought you were talking about a hydraulic roller? That spring is also a good SFT spring but you are right that it's a little weak for a solid roller.

 

August PHP, page 66. Comp XE solid street roller. It seemed all wrong to me. The valve is huge...2.30, SS, and probably with a big stem, at least 11/32nds. That is at least 145 and maybe over 160 gms. Add the solid roller lifter with link bar, and the rest of the pieces and even if they save 60gms on the spring, it doesn't seem like enough.

The Comp catalog recommends either the 26112 or 953, both have much higher spring rates (519 and 473 vs 370) and coil bind under 1.1". Oddly, they have similar seat pressures.

 

Are you saying PHR? I'll have to check that out as if it's a solid roller it's different than the article I was thinking about! I've almost ceased reading magazines in the last 5 years.