2.7L V6 Valvetrain: Difference between revisions
m (Citing sources) |
m (Additional data and citing sources) |
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| Line 8: | Line 8: | ||
O.D. | O.D. | ||
!Coil Bind Height | !Coil Bind Height | ||
!Press. @34.5mm Installed Height | !Press. @34.5mm | ||
!Press. @8mm Lift | (Installed Height) | ||
!Press. @8.9mm Lift | !Press. @26.5mm | ||
(Open 8mm Lift) | |||
!Press. @25.6mm | |||
(Open 8.9mm Lift) | |||
!Notes | !Notes | ||
|- | |- | ||
|OEM 2.7L Delta | |OEM 2.7L Delta | ||
|17. | |17.50mm | ||
24. | 24.70mm | ||
|23. | |23.80mm | ||
|45 lbs | |45 lbs | ||
|100-105 lbs | |100-105 lbs | ||
|110-115 lbs | |110-115 lbs | ||
| | | | ||
|- | |- | ||
|BC1260<ref>https://store.briancrower.com/products/valve-springs-single-nissan-qr25?variant=13489382457409</ref> | |BC1260<ref>https://store.briancrower.com/products/valve-springs-single-nissan-qr25?variant=13489382457409</ref> | ||
|17. | |17.90mm | ||
24. | 24.10mm | ||
|21.85mm | |21.85mm | ||
|70 lbs | |70 lbs | ||
| Line 48: | Line 43: | ||
|Spring base in cyl head needs machining. | |Spring base in cyl head needs machining. | ||
OEM Retainer I.D. may be too small. | OEM Retainer I.D. may be too small. | ||
|- | |||
|OEM 3.5L Sigma | |||
| | |||
|? | |||
|? | |||
|? | |||
|? | |||
|To be determined | |||
|- | |||
|VS-2283<ref>https://www.summitracing.com/parts/mel-vs-2283</ref> | |||
|19.10mm | |||
26.80mm | |||
|25.83mm | |||
|60 lbs ** | |||
|100 lbs ** | |||
|110lbs ** | |||
|Spring base in cyl head needs machining. | |||
OEM Retainer I.D. may be too small. | |||
|- | |||
|VS-2285<ref>https://www.summitracing.com/parts/mel-vs-2285</ref> | |||
|17.60mm | |||
26.70mm | |||
|26.42mm | |||
|80 lbs ** | |||
|120 lbs ** | |||
|130 lbs ** | |||
|Spring base in cyl head needs machining. | |||
'''Coil bind near 8mm lift.''' | |||
|} | |} | ||
<nowiki>**</nowiki> Denotes assumed pressure from online specifications. Valve spring yet to be measured in person. | |||
Revision as of 22:25, 7 December 2025
The purpose of this article is to explore other valvetrain options using stock components from other makes and/or models. Now that Ferrea no longer sells a complete kit we need to look to other options. For camshafts please see Camshaft Specifications.
The following table assumes you use the OEM valve retainer and keepers and maintain the OEM 34.5mm installed spring height. Stock lift is 8mm and lift of the commonly used Crower .349-.351" regrind is 8.9mm.
| Description | I.D.
O.D. |
Coil Bind Height | Press. @34.5mm
(Installed Height) |
Press. @26.5mm
(Open 8mm Lift) |
Press. @25.6mm
(Open 8.9mm Lift) |
Notes |
|---|---|---|---|---|---|---|
| OEM 2.7L Delta | 17.50mm
24.70mm |
23.80mm | 45 lbs | 100-105 lbs | 110-115 lbs | |
| BC1260[1] | 17.90mm
24.10mm |
21.85mm | 70 lbs | 140 lbs | 150 lbs | |
| BC1220[2] | 17.96mm
25.15mm |
22.86mm | 90 lbs | 175 lbs | 185 lbs | Spring base in cyl head needs machining.
OEM Retainer I.D. may be too small. |
| OEM 3.5L Sigma | ? | ? | ? | ? | To be determined | |
| VS-2283[3] | 19.10mm
26.80mm |
25.83mm | 60 lbs ** | 100 lbs ** | 110lbs ** | Spring base in cyl head needs machining.
OEM Retainer I.D. may be too small. |
| VS-2285[4] | 17.60mm
26.70mm |
26.42mm | 80 lbs ** | 120 lbs ** | 130 lbs ** | Spring base in cyl head needs machining.
Coil bind near 8mm lift. |
** Denotes assumed pressure from online specifications. Valve spring yet to be measured in person.
