valve float with FI
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,343
Likes: 16
From: las vegas NV
valve float with FI
will i have to worry about valve float if running 7-9psi through a vortech s trim?i dont plan on upgrading blowers down the road and i dont want to make more than 500-550rwhp. i actually plan on running about 450-500rwhp. this is going to be strictly a street car with one or two passes at the track a year. are there any other problems i may run in to?
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,343
Likes: 16
From: las vegas NV
what all will i need for once i install the vortech kit? other than injectors and a tune? i also plan on throwing in a 02+Z06 cam......is this worth the effort or would i be better off just upping the boost? also can i install new valve springs without removing the heads? could i use Z06 valve springs or will i run into the same problem?
thanks
thanks
Former Vendor
Joined: Feb 2004
Posts: 10,876
Likes: 8
From: Las Vegas NV
St. Jude Donor '06 & '12
Comp 918's would work fine..
Although the cam would work fine, If it were me, I wouldnt waste my time with it unless you were swapping heads.
Yes you can swap springs without removing the heads..
NO, dont waste your time with Z06 springs...
Although the cam would work fine, If it were me, I wouldnt waste my time with it unless you were swapping heads.
Yes you can swap springs without removing the heads..
NO, dont waste your time with Z06 springs...
what all will i need for once i install the vortech kit? other than injectors and a tune? i also plan on throwing in a 02+Z06 cam......is this worth the effort or would i be better off just upping the boost? also can i install new valve springs without removing the heads? could i use Z06 valve springs or will i run into the same problem?
thanks
thanks
Former Vendor
Joined: Feb 2004
Posts: 10,876
Likes: 8
From: Las Vegas NV
St. Jude Donor '06 & '12
Wait a minute...I just read thw WHOLE thread..
If your only looking for 500-5550 then I wouldnt bother swapping springs..
UNLESS that is you are swapping the cam as well. If not, dont bother until you start to dive further into the F/I pit..(And I do mean pit..)
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,343
Likes: 16
From: las vegas NV
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Safety Car
Joined: May 2006
Posts: 3,799
Likes: 1
From: Northern Virginia
St. Jude Donor '08
Hate to sound like I am disagreeing with Jeff, but I would give some more thought to changing the springs. You have a 2000 FRC so you have some wear on the springs. On top of that you are going to be increasing the pressure on those springs by at least 50% (7 - 9 lbs boost) with the supercharger. It does not costs too much to change the springs and put on better retainers. The cost of valve float can be high. At a minimum if it occurs you have to change the springs anyway. At worse, you could really trash your motor. Then you are into the big $$$$ territory.
I always say better safe than sorry.
I always say better safe than sorry.
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,343
Likes: 16
From: las vegas NV
Hate to sound like I am disagreeing with Jeff, but I would give some more thought to changing the springs. You have a 2000 FRC so you have some wear on the springs. On top of that you are going to be increasing the pressure on those springs by at least 50% (7 - 9 lbs boost) with the supercharger. It does not costs too much to change the springs and put on better retainers. The cost of valve float can be high. At a minimum if it occurs you have to change the springs anyway. At worse, you could really trash your motor. Then you are into the big $$$$ territory.
I always say better safe than sorry.
I always say better safe than sorry.
Racer
Joined: Mar 2006
Posts: 464
Likes: 0
From: silverdale washington
Doesnt matter w/ 9lbs and a surface area of roughly 3" squared on the valves that means your valve springs effectively lost 27 lbs of force, So now instead of 90ish lbs seat pressure you have 63lbs of seat pressure. Not enough!!!!! Chevy went small for better wear characteristics, and they still decided it needed 90lbs of seat pressure and they have millions of dollars into R&D. Just think about it. Couple hundred bucks on double springs could save you a couple thousand dollar motor.
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,343
Likes: 16
From: las vegas NV
i never heard of valve float killing a motor and would like to see some proof. i would also like to see dyno graphs showing valve float with that kind of boost from a centri. im not saying i dont believe you i just want to see it with my own eyes
Drifting
Joined: May 2001
Posts: 1,392
Likes: 0
From: Wabash,IN
CI 7-8-9-10 Veteran
St. Jude Donor '08
here ya go i have valve float and im changing my spring from stock to 918 and im also changing my pushrod because bob @ epp told me they may be bent a little and that the stockers are a cheaper product
here my dyno at 5000-5500 it dips hope this helps you jay
.
here my dyno at 5000-5500 it dips hope this helps you jay
.
