The Cal-look Lounge
Welcome, Guest. Please login or register.
Did you miss your activation email?
March 28, 2024, 23:52:13 pm

Login with username, password and session length
Thank you for your support!
Search:     Advanced search
350646 Posts in 28563 Topics by 6811 Members
Latest Member: Bren
* Home This Year's European Top 20 lists All Time European Top 20 lists Search Login Register
+  The Cal-look Lounge
|-+  Cal-look/High Performance
| |-+  Pure racing
| | |-+  JPM double springs
« previous next »
Pages: [1] Print
Author Topic: JPM double springs  (Read 2754 times)
Airspeed
Hero Member
*****
Posts: 593



« on: May 25, 2008, 21:56:15 pm »

Does anyone know if these have comparable, bit less or more seat and opening pressure compared to the GeneBerg double VW spring set?

Where to buy them?

Tnx,
Walter

Logged

"...these cars were preferred by the racers because the strut front suspension results in far superior handling than the regular torsion bar front end..."  - Keith Seume.
10.58 @ 130 mph (2/9/2022 Santa Pod)
RMS Boxer Service
Sr. Member
****
Posts: 308


WWW
« Reply #1 on: May 26, 2008, 14:17:57 pm »

Translated from JPM's homepage in swedish (the ino is not present in the english version)

Valvespring messurements:

Outer spring:
open length 54mm
Coil bind 20 mm
Outer dia 31,8 mm
tread dia 4,00 mm
L1 25.0mm
F1 928N


Inner spring:
open length 54mm
Coil bind 20 mm
Outer dia 22
tread dia 3,00 mm
L1 25.0mm
F1 580N


Íf you still have questions, send Johannes an email and I'm sure he will answer you, he's a very friendly guy Cool Cool

/Rolf

Logged
Rasser
Sr. Member
****
Posts: 488



« Reply #2 on: May 26, 2008, 18:38:24 pm »

I went from GB273A springs (had valvefloat problems).

All i can say is I didn´t have the problems after changing to JPM springs - I´ll leave the math to someone else ;-)


highly recommended.
Logged

For a good time, call:    1-800-Cal-look
1955 type1
1966 type2 13w deluxe
Roman
Hero Member
*****
Posts: 656



« Reply #3 on: May 26, 2008, 19:55:49 pm »

I had them om my old engine. They can take 16.4 mm valve lift with 2 mm to coil bind. My set had 170 lbs seat pressure and it was enough to control a 46 mm steel valve over 8000 rpm.
Logged
Airspeed
Hero Member
*****
Posts: 593



« Reply #4 on: May 26, 2008, 21:32:07 pm »

Thanks !
I was looking for a set to control a turbo engine and they seem the right part for the job!
Thanks for the translating job as well  Smiley
Logged

"...these cars were preferred by the racers because the strut front suspension results in far superior handling than the regular torsion bar front end..."  - Keith Seume.
10.58 @ 130 mph (2/9/2022 Santa Pod)
Pages: [1] Print 
« previous next »
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Valid XHTML 1.0! Valid CSS!