4G63 Valve Spring Rates and Tests

Valve spring comparison #2

Evo VIII, Stock DSM, Manley, Brian Crower

 From left to right

· Used EVO VIII
· Used Stock 4G63
· Used Manley
· Used BC1100
· New BC1100

The EVO springs, set of 16, tested 58-62 lbs @ 1.530

Used stock 4G63 valve spring Appox. 140k miles

56lbs @ 1.530

Used Manley Valve spring, mileage unknown.

78lbs @ 1.530

Used BC1100 valve spring, Appox 5000 miles

85 lbs @ 1.530 

There must have been a change in the production of the springs about 2-3 years ago. Since the used springs test stronger than the new ones.

New BC1100, right out of the box

80 lbs @ 1.530   

Part Number #160-1280

Free length 1.910
O.D. 1.110
I.D. .754
Wire size .145x.178


Closed position
pressure & Length (intalled specs)
66@1.575 Valve closed

Open position
Pressure & length Valve Open
160@1.240

solid height
1.100

The factory installed springs should be close to this also.

EDIT: I just checked 7 sets of used 4G63 valve springs, and only came up with 1 and a half sets of decent used springs.
Most springs checked between 45-55 Lbs @ 1.575
I would say a good spring should test at 60lbs@1.575, Most spring manufactures, will allow 10% loss in spring tention for spring "break in"
I used a Rimac spring pressure tester.


Ferrea “beehive” Spring info


Specs on the springs
- Spring O.D. - 23.87mm / 28.07mm = .939/1.105
- Spring I.D. - 14.73mm / 18.85mm = .579/.742
- Seat Pressure - 90 lbs. @38mm = 1.496
- Open Pressure - 225 lbs. @28mm =1.102
- Rate Inch - 342 lbs.
- Coil Bind - 23mm =.905
- Max Net Lift – 13.5mm = .531
- Spring Material - PAC Alloy

http://www.extremepsi.com/store/cust...at=1417&page=1

BC 1100 Valve spring info
Spring Pressure:
BC1100 Seat:
Colsed 1.500" @ 95 lbs /
Open: 1.000" @ 235 lbs /
Coil Bind: 0.935"
(no machine work required)

http://www.briancrower.com/makes/mitsubishi/4g63.shtml


GSC Power-Division 4G63T Beehive Single Spring Set
Spring Pressures :
Seat @ 1.56"=68 lbs / .300"=160lbs / .400"=190lbs / .450"=210lbs / .625"= Coil bind.

http://www.vr-speed.com/store/gsc-po...63-p-2046.html


Kiggley springs
97lb Seat Pressure at 1.440"

325lb/in Rate

http://www.shop.kigglyracing.com/pro...2&categoryId=1

Source : http://www.dsmtuners.com/forums/cylinder-head-short-block/440147-valve-spring-comparison-2-evo-viii-stock-dsm-manley-brian-crower.html
by BogusSVO