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Old 08-12-2022, 01:01 PM   #26
mikep
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Originally Posted by culberro View Post
OK, so I did some spring measuring, and compiled some notes from all the spring sets I've measured.

You will find the spring force at installed height (38mm/1.5in), force at bind and bind height, max lift (bind height +1mm), spring rate, and spring force at 12mm lift using a 38mm installed height. Now you can move the spring forces around with spring shims and playing with the installed height.

Stock small diameter spring: 55-60lbs @ 38mm, Coil Bind: 200-210lb @ 24.8mm, max lift ~12.2mm. Rate: ~265lb/in. 185lbs @ 12mm lift
Retainer/spring mass: 18g, 40g

Stock MID diameter spring, OD 29mm: 70lb @ 38mm, Coil Bind: 200lb @ 24.5mm, max lift ~12.5mm. Rate: ~243lbs/in. 185lbs @ 12mm lift.
Retainer/spring mass: 19g, 48g

Old RSI(?) single spring and Large dia OEM retainer: 135lb at 38mm, Coil Bind: 280lb @ 22.6mm, max lift ~14.4mm. Rate: ~240lb/in. 250lbs @ 12mm lift
Retainer/spring mass: 21.4g, 48.8g

Single Culberro Spring: 110lb @ 38mm, Coil Bind: 230@21.3mm, max lift ~ 15.5mm. Rate: ~210lb/in. 210lb @ 12mm lift
Retainer/Spring mass: 19g, 46.8g

Yoshifab Beehive: 108lb @38mm, Coil Bind: 240@24mm, max lift ~13mm. Rate: 240lb/in. 220lbs @ 12mm lift.

Erland Cox Dual Springs: 100lbs @ 38mm, 275lbs @ 16mm lift (bind is 19mm), Rate: 275lb/in. 230lbs @ 12mm lift

BTR SP008: 70lb @ 38mm, Coil Bind: 275lb @ 22.1mm, max lift 14.9mm, rate 330lb/in. 225lbs @ 12mm lift.
Spring mass: 38.6g
For BTR SP008 use Ferrea retainer #E12014, will need to find lower spring seat or use small diameter Volvo spring seat with excessive play.

I'll weigh some retainers and add their weights later on. If anyone has the weight of the Yoshifab retainer, that would be great!
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Originally Posted by culberro View Post
I'll make a shared g-doc for the info, and update it as I measure more springs.
Beauty.
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Old 08-12-2022, 01:53 PM   #27
culberro
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And Done: https://docs.google.com/spreadsheets...it?usp=sharing

I was going to add in the KL Racing single and duals that I've installed.. but they are way off from their listed values. I measured the duals at 140lbs installed, and they list them at 100-110...
I do know their retainers are heavy at 24g
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Old 08-12-2022, 11:29 PM   #28
red740t
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Quote:
Originally Posted by culberro View Post
I'll make a shared g-doc for the info, and update it as I measure more springs.
Quote:
Originally Posted by culberro View Post
And Done: https://docs.google.com/spreadsheets...it?usp=sharing

I was going to add in the KL Racing single and duals that I've installed.. but they are way off from their listed values. I measured the duals at 140lbs installed, and they list them at 100-110...
I do know their retainers are heavy at 24g
I’m going to order a set of Scat springs and retainers. I’ll see if I can measure them at my buddies shop and report back
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Old 08-30-2022, 04:14 PM   #29
culberro
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Quote:
Originally Posted by culberro View Post
And Done: https://docs.google.com/spreadsheets...it?usp=sharing

I was going to add in the KL Racing single and duals that I've installed.. but they are way off from their listed values. I measured the duals at 140lbs installed, and they list them at 100-110...
I do know their retainers are heavy at 24g
I added a few more springs, including a set of duals sent in by dl242gt. These appear to be slightly stiffer than the Isky 455-456 that we thought they were.
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Old 09-21-2022, 09:27 PM   #30
85245avl
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if the vw springs and keepers work does that mean the scat 37mm type I valves would work too?
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Old 09-21-2022, 10:23 PM   #31
culberro
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Originally Posted by 85245avl View Post
if the vw springs and keepers work does that mean the scat 37mm type I valves would work too?
Yes/no. They’re a little longer and don’t play well with stock camshaft base circle diameters.
If you go to a reduced base circle cam, they work great

Most of the VW replacement valves are not hard chromed in the stems, so they have to be used with bronze guides or inserts.
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