Where to get Heavy Duty Valve springs for Rx-1

[NHBoy]

Going up on the boost guage this season. I'm planning on running 26 lbs of boost and am seriously considering the heavy duty springs. 2 items I could use good feedback on.

1. Who stocks them?

2. What have you high boost guys noticed pros and cons of running the heavy springs?

My brothers Turbo is running the heavy springs and I see no down side to it yet. Anybody run this much boost without the bigger springs?

Thanks for looking.

Marco

 

[DennisTheMenace]

Call Jeff at CPR. He sells them and can answer any questions you have about them!

 

[Remmy]

I would also love to hear some info on this, What is the max boost you can run without doing valve springs? I've been hearing conflicting info. Would the Apex and RX-1 be similar in this regard?

 

[HURRICANE]

I had a conversation with Terry Pain when he owned Bender racing and he thought that the intake valve spring should have 1 lb seat pressure per 1 lb boost. I also had a conversation with Jeff at CPR and he disagreed.He said that cylinder pressure helps to hold the valve closed.Having said all that,,,,last year I had 31lbs seat pressure in order to boost 31lbs. I had no valve float. This year I have 24lbs seat pressure and I boosted 32lbs on the dyno last Sunday with no valve float. I believe that 24lbs is more than enough seat pressure with stock cams. A more agressive cam grind will require more pressure. I hope this helps

 

[srxguy]

What is the stock pressure on a rx1??

 

[KnappAttack]

Don't waste your time or money on heavier valve springs. Stock springs make more power and are easier on the cam and buckets in a turbo application. Hi-RPM would be a different senerio.

 

[HURRICANE]

stock pressure on RX1 is 21lbs on the seat

 

[srxguy]

ok thanks...was just curious

 

[Remmy]

Great info guys, I'm not planning on ever taking it higher than 22 lbs, but some have said anything over 15 lbs would max out the stock valve springs.

 

[NHBoy]

This is good information guys. Keep it coming. I have heard both ways. My concern is as Mike indicates, will I wear the cams and buckets sooner? This is for a pro-stock style setup so the freeer reving the better.

Has anyone run 26 - 28 lbs with stock springs? I would love to hear your experiences.

KnappAttack
With your experience I respect your opinions. Have you run boost in the 22+ range? What has been your experience?

Thanks for the input.

Marco

 

[zross1]

Don't waste your time or money on heavier valve springs. Stock springs make more power and are easier on the cam and buckets in a turbo application. Hi-RPM would be a different senerio.

Yup, valve float is rpm based, not boost related.

 

[wheeline]

This may sound like a rookie question, but how do you know if your getting valve float? I have stock springs and turned max boost on a 28rs. As near as I could tell it was about 26-28 lbs.

 

[Ted Jannetty]

Has anyone run 26 - 28 lbs with stock springs? I would love to hear your experiences.

Thanks for the input.

Marco

Yep been there done that, 28 psi on stock used motor with 3 head gaskets.