|
Title: JPM double springs Post by: Airspeed 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 Title: Re: JPM double springs Post by: RMS Boxer Service 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 8) 8) /Rolf Title: Re: JPM double springs Post by: Rasser 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. Title: Re: JPM double springs Post by: Roman 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.
Title: Re: JPM double springs Post by: Airspeed 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 :) |