Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

Valve spring drought

 
Old 05-09-2019, 04:16 PM
  #61  
Junior Member
 
Join Date: Nov 2018
Posts: 54
Total Cats: -1
Default

Do not bother with JEGS. The only reason they don't show these springs as not available is for you to try and order them, and fill your basket with more of their ****. I contacted them multiple times, concluding they don't know, and the manufacturer does not have an ETA. All info I got was that JEGS is waiting for a huge order for this part.

First ordered them on March 10. Well it's been 05/06 and guess what? Nothing yet. They offered me to cancel the 855s and ship the rest of the order...




Originally Posted by TruboNB View Post
Ok my order of springs from VP Volvo parts just came in and I thought I'd give a little update if anyone else was trying to get some springs. Ended up paying like $93 or something shipped to my door. Really nice people there.

The dimensions appear to be perfect and the factory top retainer fits well into the ID of the springs. My head is at the shop so I can't test actual fitment, but I took measurements and everything looks good.
About those 418737. Do you have any more info on them? Do you have any info on what they are like yet? I also think the ST heavy doubles are a little expensive. Especially to get them shipped to me (Europe). Those 418737 seem to be a lot easier to find around here. Let us know if anyone has more info on those!
Ramonn is offline  
Old 05-09-2019, 04:22 PM
  #62  
Junior Member
 
Join Date: Sep 2010
Posts: 84
Total Cats: 10
Default

That is OEM volvo part numbers for the springs. Swedish parts for swedish bricks. OEM or they might be IPD sourced by now.

VP auto helped me with parts on my old 740 volvo chumpcar. and was the first place i went to get volvo springs and parts.
Volvo posted below.. note the cage.. behind it is a Turbocharge 5 speed plymouth voyager minivan.
masterjr33 is offline  
Old 05-09-2019, 05:44 PM
  #63  
Newb
 
Join Date: Dec 2017
Posts: 28
Total Cats: 2
Default

masterjr33, that made me have a flashback to the days of Turbo Minivan of 89 turbo mini van!

The website is still up!

Last edited by _integrity; 05-09-2019 at 06:45 PM.
_integrity is offline  
Old 05-23-2019, 06:21 AM
  #64  
Newb
 
Join Date: Mar 2010
Posts: 18
Total Cats: 6
Default

If anyone would like to let me borrow their springs over a week i can run them on my instron tensile tester at work and we can see the exact forces from free length to bind.

I want to get a hold of the , 94-97 NA8, BC spring. Oem VVT, VS855, and the 418737 volvo spring.

Originally Posted by TruboNB View Post
Ok my order of springs from VP Volvo parts just came in and I thought I'd give a little update if anyone else was trying to get some springs. Ended up paying like $93 or something shipped to my door. Really nice people there.

The dimensions appear to be perfect and the factory top retainer fits well into the ID of the springs. My head is at the shop so I can't test actual fitment, but I took measurements and everything looks good.

Volvo Miata valve spring dimensions
ian99rt is offline  
Old 05-24-2019, 07:16 PM
  #65  
Newb
 
Join Date: Dec 2017
Posts: 28
Total Cats: 2
Default

Ian I could most likely share an 01-05 VVT Intake and Exhaust spring to help gather data. What do you think turnaround time would be as I would need them back
_integrity is offline  
Old 05-25-2019, 08:56 AM
  #66  
Newb
 
Join Date: Mar 2010
Posts: 18
Total Cats: 6
Default

I shouldnt have said i need VVT springs. Got a full 50k mile head set that im looking to upgrade.

Still need samples of the other springs and i really dont want to take data on sample sets of 1.

Originally Posted by _integrity View Post
Ian I could most likely share an 01-05 VVT Intake and Exhaust spring to help gather data. What do you think turnaround time would be as I would need them back
ian99rt is offline  
Old 05-25-2019, 03:10 PM
  #67  
Newb
 
Join Date: Mar 2010
Posts: 18
Total Cats: 6
Default

Ordered Qty 1 of a new Mazda OEM 1996 Valve spring (same part # for intake and exhaust) and Qty 1 NB2 VVT engine's exhaust valve springs.

If anyone has a spare volvoish spring or BC spring i'll gladly measure those too and post results here.
ian99rt is offline  
Old 05-25-2019, 04:08 PM
  #68  
Newb
 
Join Date: Dec 2017
Posts: 28
Total Cats: 2
Default

Awesome stuff. The data should be very fun to compare.
_integrity is offline  
Old 05-26-2019, 10:07 AM
  #69  
Newb
 
Join Date: Mar 2010
Posts: 18
Total Cats: 6
Default

Okay so far I have the following springs enroue:

NA8 OEM Valve Spring (PN BP05-12-125)
NB2 OEM Exhaust Valve Spring (BP2Y-12-125A)
Sealed Power NA8 Spring (PN VS-949)
Brian Crower (BC1600-1)

I'm putting together a spreadsheet with all the listed spring variable and trying to fill in the blanks by calculating missing info.

What really gets me is I can't find any info on the NB2 valve springs or installed heights but i'll measure the best i can.
ian99rt is offline  
Old 05-31-2019, 10:51 PM
  #70  
Newb
 
Join Date: Dec 2017
Posts: 28
Total Cats: 2
Default

I have some data on those which I provided to BC.

From an earlier post of mine in this thread:

After some research on their side they found a spring they think would be a good fit. I needed to measure the install height so some math could be done:

I installed a valve without spring, measured from area where the bottom of the valve spring sits in it's seat to the top of the valve. I did this with a digital caliper, nothing super technical. I then removed with math the height of the top of the valve down to the area of the retainer where the top of the spring will sit and also removed the shim as well.
This seemed logical as to how to get the measurement properly.1.8120" - 0.2815" - 0.0215 = 1.509" on a factory 2001-2005 Head
_integrity is offline  
Old 06-09-2019, 05:46 PM
  #71  
Newb
 
Join Date: Mar 2010
Posts: 18
Total Cats: 6
Default Data Overload!

Okay so for the data nerds out there.

I got the chance to test 5 different springs some have mentioned here and in the BP valve spring info thread started by BogusSVO.

All spring unloaded dimensions were measured with Calibrated Mitutoyo calibers and micrometers, force testing was conducted on a Instron Tensile tester using a 250 lbsf max load cell and loaded at a rate of 30 lbsf/min.

1) 50k mile old JDM BP6D Intake Spring
2) Sealed Power PN # VS-949 (OEM Equilvialant for 1994-1997 NA8 engine)
3) New OEM PN# BP05-12-12 Spring (Mazda OEM Valve Spring for 1994-1997 NA8 engine)
4) New OEM PN# BP2Y-12-125A Spring (Mazda OEM Valve Spring for 2001 BP6D Exhaust Valve)
5) New Brian Crower PN# BC1600-1 (Some have suggested this valve as a possibility but measurements show it would be inferior to the oem NA8 Spring)

Hopefully my excel sheet sharing through dropbox works. WARNING: This is a big excel file as I have over 20,000 data points for each spring during the tensile tests.

https://www.dropbox.com/s/p4ovihvg5a...Rev2.xlsx?dl=0





ian99rt is offline  
Old 06-09-2019, 05:56 PM
  #72  
Newb
 
Join Date: Mar 2010
Posts: 18
Total Cats: 6
Default

I measured only 1 intake valve position but I did it using a 1.250" long 1" OD .75" ID alum sleeve and a light helper spring from Ace HW. I assembled the valve into head with sleeve and spring in place of normal valve spring. I then used a Brown and Sharp Dial indicator to measure the amount the valve could be pushed down to the aluminum sleeve.

This distance + the 1.2500" aluminmum sleeve (measured with micrometers) equaled a spring closed height of 1.520"
ian99rt is offline  
Old 06-09-2019, 08:27 PM
  #73  
Junior Member
 
Join Date: Jan 2016
Location: Atlanta, GA
Posts: 184
Total Cats: 20
Default

Wait, so OEM NA8 springs are within a few lb of brand spanking new VS855 springs? So everyone that's been chasing those down should have just been looking for new NA8 springs instead?
Wingman703 is offline  
Old 06-09-2019, 10:49 PM
  #74  
Newb
 
Join Date: Mar 2010
Posts: 18
Total Cats: 6
Default

Wignman703: The VS-949 spring is within a few pounds of the the OEM NA8 spring. I did not have a VS-855 to measure.

But If you go by the golden rule of .060" margin between open compression length and bind (this helps dampen resonant oscillation in the spring) then the OEM NA8 spring is ideal with the measured installed spring height I measured and the VS-855 would be too close to bind. If measured install height we're the assumed 1.555" then the VS-949 would be a good option with a little shimming as it is just a little stronger spring rate.

NA8 springs give me right at .059" bind margin and a good 60.8 lbsf closed (this is for a Naturally Aspirated AutoX engine) while upping full open force by 32 lbsf (162 vs 130, NA8 spring vs NB2 Intake spring respectively) to fight valve float on the steep BP6D intake cam ramp.
ian99rt is offline  
Old 06-11-2019, 08:59 PM
  #75  
Newb
 
Join Date: Mar 2010
Posts: 18
Total Cats: 6
Default

Updated the spreadsheet a little with conditional formatting on the coil-bind clearance, with .050" to .060" being ideal.
ian99rt is offline  
Old 06-11-2019, 09:12 PM
  #76  
Newb
Thread Starter
 
Join Date: Nov 2018
Posts: 34
Total Cats: -6
Default

Damn dude this is amazing info

You're doing the Lord's work here!
TruboNB is offline  
Old 06-11-2019, 10:18 PM
  #77  
Senior Member
 
Schroedinger's Avatar
 
Join Date: Apr 2016
Location: Atlanta
Posts: 603
Total Cats: 122
Default

I have a set of VS855’s I was going to use on a head build this summer. I could send you a few to test if you want; PM me the info.
Schroedinger is offline  
Old 06-11-2019, 11:23 PM
  #78  
Newb
 
Join Date: Mar 2010
Posts: 18
Total Cats: 6
Default

PM sent

Originally Posted by Schroedinger View Post
I have a set of VS855s I was going to use on a head build this summer. I could send you a few to test if you want; PM me the info.
ian99rt is offline  
Old 06-12-2019, 10:35 PM
  #79  
Newb
 
Join Date: Mar 2010
Posts: 18
Total Cats: 6
Default

So I got my 20 BP05-12-125 springs in and primed an excel sheet for more tensile tester data. Tomorrow night I should have it updated with all 21 springs worth of info.

The OEM springs are ground to a surprisingly consistent length of 1.8355 .002 (except for one flyer at 1.831).

https://www.dropbox.com/s/g0bknwzjcm...ents.xlsx?dl=0
ian99rt is offline  
Old 06-13-2019, 10:21 PM
  #80  
Newb
 
Join Date: Mar 2010
Posts: 18
Total Cats: 6
Default

Alrighty So linked excel sheet above for the BP05-12-125 springs is filled out. Had some interestingly varying bind heights.

Luckily I was able to select from the 21 springs a good set for the intake and exhaust that will be right in the sweet spot of coil-bind clearance and pretty close to each other statistically.

25mB excel file woooooh!
ian99rt is offline  

Thread Tools
Search this Thread
Quick Reply: Valve spring drought


Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.