Valve Spring choice/seat pressure ??
 

Ok I messaged Kelford about the springs I have.

I have crower titanium retainers and spring set, NOT BC.

Anywho he/they sent me 2 messages.

First he said yeah they will be fine, then he said wait, you will need our beehive spring with shim to get the 110lb seat pressure.

I told him E85, 35psi and about 500whp on a DJ. and limit of 8kish.

Any reason boost level would make him change his mind on spring selection.

Re: Valve Spring choice/seat pressure ??
 

Just curious.. Is this still going to be on the 16g or are you running a different turbo now?

Re: Valve Spring choice/seat pressure ??
 

The force of the boosted air behind the valve body trying to push into the cylinder?

I never thought about it before but I guess there will always be a static 35psi pushing on your intake valves when they are closed.

Re: Valve Spring choice/seat pressure ??
 

What cam shafts?

Re: Valve Spring choice/seat pressure ??
 

Kelford 272s.

Re: Valve Spring choice/seat pressure ??
 

110lbs of seat pressure is A LOT. This is not a truck boat truck V-8 will long push rods and rockers. Stock seat pressure is like 50 some lbs and the crowers should be ~60-65 lbs seat pressure and pending lift ~150-160lbs full open pressure. I ran crower spec springs in my car shimmed for 210lbs full open pressure (.430" intake lift), and my car seemed to like the 47psi it made on the street. So I take it you are worried about the valves on the intake side of the cylinder on the exhaust stroke being pushed open by intake manifold pressure? The exhaust manifold will be under higher pressure but the valves are a little smaller also.

~John

Re: Valve Spring choice/seat pressure ??
 

Basically at first kelford said my spring setup was fine, then he said no because of the boost level that I would need their spring with shim.

Re: Valve Spring choice/seat pressure ??
 

I run standard Crowers in my car too. I put a small shim under them, but it wasn't much, .025" or something? I run Crower 415's too, which should be much bigger than the 272's. The ramp is one of the big things with springs, but I doubt they would ramp up that extreme for a medium cam. I bet you would be fine with the Crowers.

Re: Valve Spring choice/seat pressure ??
 

Cam specs here:

http://www.camshaftshop.com/camshaft...3-4g63-vr4/30/

Spring info:

Kelford Racing, High performance valve spring set (with spring base and titanium retainer) to suit 4G63 DOHC engines, EVO1-EVO9. The valve spring is of ovate wire beehive style, the benifit of this is superior valve control therefore allowing more rpm, boost and reliability versus a parallel spring design. Use the factory spring base for Street/ Strip applications up to 8000rpm and 23.5lb(1.6 bar) boost, over that use the supplied spring base to incerase seat pressure to 110lb (50kg)

Re: Valve Spring choice/seat pressure ??
 

Well of course they want you to buy there springs. I think your fine with what you have, they are a proven setup.

~John

Re: Valve Spring choice/seat pressure ??
 

The stock intake valve is 34mm. That's 1.338 inches in diameter. Or 1.406 inches squared of area. 23.5 PSI on a 1.406 square inch area = 33.04 lbs of force. 35 PSI on a 1.406 square insch area = 49 lbs of force.

Those calculations assume the stated pressure on one side (23.5 and 35 PSI) ,and 0 (ZERO) PSI on the other side. In most points of an engine's operation (intake, compression, power and exhaust strokes) it will be in a state with much less pressure differential than than (cylinder pressure being higher for a lot of it)

Re: Valve Spring choice/seat pressure ??
 

I had the Crowers with the 272s in my car, and they were just fine revving to 8500.
However, I gave that head to my husband to run with his 272s, as I did not trust them with the lift of the 4R cams. I'm just going to play it safe on the more aggressive cam and go Kiggly.

Re: Valve Spring choice/seat pressure ??
 

lmfao! Truck boat truck. If you did that on purpose, you are the man, man.

As for the springs, I'm with everyone else, just run what you have. It'll be fine.

Re: Valve Spring choice/seat pressure ??
 

He did, we (John, Ryan, I) are squidbillies addicts.

Re: Valve Spring choice/seat pressure ??
 

^word.

Re: Valve Spring choice/seat pressure ??
 

wtf, so brown did some cracker ass cracker try to tell you, hey may you are running a lot of boost and need to run my valve springs to make made OMG HP's? I think you need a good SMIM to make use of this setup, look at the PM and tell your friends. Where is the GIF of the ups truck, this thead dilevers.

John

Re: Valve Spring choice/seat pressure ??
 

I don't know if he is a cracka, but i emailed him again he is in NZ so i told him everyone here in the US thinks he is crazy, it usually takes them like 10-14 days to respond so we will see.

Also you sig delivers. and yes I do need a SMIM