2.7L V6 Valvetrain: Difference between revisions

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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 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]].


== Valve Springs ==
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.
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.
{| class="wikitable"
{| class="wikitable"
Line 25: Line 26:
|
|
|-
|-
|BC1260<ref>https://store.briancrower.com/products/valve-springs-single-nissan-qr25?variant=13489382457409</ref>
|BrianCrower
BC1260<ref>https://store.briancrower.com/products/valve-springs-single-nissan-qr25?variant=13489382457409</ref>
|17.90mm
|17.90mm
24.10mm
24.89mm
|21.85mm
|21.85mm
|70 lbs
|70 lbs
|140 lbs
|140 lbs
|150 lbs
|150 lbs
|
|Best fit for 45-55% more pressure
|-
|-
|BC1220<ref>https://store.briancrower.com/products/valve-springs-single-nissan-vq35de?variant=13489358929985</ref>
|BrianCrower
BC1220<ref>https://store.briancrower.com/products/valve-springs-single-nissan-vq35de?variant=13489358929985</ref>
|17.96mm
|17.96mm
25.15mm
25.15mm
Line 45: Line 48:
|-
|-
|OEM 3.5L Sigma
|OEM 3.5L Sigma
|
|19.20mm
|?
26.50mm
|?
|26.4mm
|?
|50 lbs
|?
|100 lbs
|To be determined
|****
|'''Coil bind near 8mm lift.'''
|-
|-
|VS-2283<ref>https://www.summitracing.com/parts/mel-vs-2283</ref>
|Melling
VS-2283<ref>https://www.summitracing.com/parts/mel-vs-2283</ref>
|19.10mm
|19.10mm
26.80mm
26.80mm
Line 62: Line 67:
OEM Retainer I.D. may be too small.
OEM Retainer I.D. may be too small.
|-
|-
|VS-2285<ref>https://www.summitracing.com/parts/mel-vs-2285</ref>
|Melling
VS-2285<ref>https://www.summitracing.com/parts/mel-vs-2285</ref>
|17.60mm
|17.60mm
26.70mm
26.70mm
Line 71: Line 77:
|Spring base in cyl head needs machining.
|Spring base in cyl head needs machining.
'''Coil bind near 8mm lift.'''
'''Coil bind near 8mm lift.'''
|-
|Ferrea
S10134<ref>https://www.vividracing.com/ferrea-single-valve-spring-single-hyundai-lambda-2010-p-153686147.html</ref>
Lambda 3.8L
|18.30mm
25.19mm
|21.60mm
|95 lbs **
|140 lbs **
|150 lbs **
|Spring base in cyl head needs machining.
OEM Retainer I.D. may be too small.
|}
|}
<nowiki>**</nowiki> Denotes assumed pressure from online specifications. Valve spring yet to be measured in person.
<nowiki>**</nowiki> Denotes assumed pressure from online specifications. Valve spring yet to be measured in person.
== Valve Spring Retainers & Keepers/Locks ==
Our OEM retainers and keepers are meant for a ~17.50mm I.D. valve spring. The keeper angle is 9 degrees for a 6mm valve stem. There are several retainers that look like they might fit our motor but you may run into mismatched keeper angles, valve stem diameters or incorrect keeper grooves on the valve stems. For example a BC2220<ref>https://store.briancrower.com/products/bc2220-1?variant=13489835540545</ref> Titanium retainer may appear like a perfect match but it has a 7 degree keeper angle.

Latest revision as of 00:17, 7 January 2026

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.

Valve Springs

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.

2.7L V6 Valve Spring Comparison
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
BrianCrower

BC1260[1]

17.90mm

24.89mm

21.85mm 70 lbs 140 lbs 150 lbs Best fit for 45-55% more pressure
BrianCrower

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 19.20mm

26.50mm

26.4mm 50 lbs 100 lbs **** Coil bind near 8mm lift.
Melling

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.

Melling

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.

Ferrea

S10134[5] Lambda 3.8L

18.30mm

25.19mm

21.60mm 95 lbs ** 140 lbs ** 150 lbs ** Spring base in cyl head needs machining.

OEM Retainer I.D. may be too small.

** Denotes assumed pressure from online specifications. Valve spring yet to be measured in person.

Valve Spring Retainers & Keepers/Locks

Our OEM retainers and keepers are meant for a ~17.50mm I.D. valve spring. The keeper angle is 9 degrees for a 6mm valve stem. There are several retainers that look like they might fit our motor but you may run into mismatched keeper angles, valve stem diameters or incorrect keeper grooves on the valve stems. For example a BC2220[6] Titanium retainer may appear like a perfect match but it has a 7 degree keeper angle.

  1. ↑ https://store.briancrower.com/products/valve-springs-single-nissan-qr25?variant=13489382457409
  2. ↑ https://store.briancrower.com/products/valve-springs-single-nissan-vq35de?variant=13489358929985
  3. ↑ https://www.summitracing.com/parts/mel-vs-2283
  4. ↑ https://www.summitracing.com/parts/mel-vs-2285
  5. ↑ https://www.vividracing.com/ferrea-single-valve-spring-single-hyundai-lambda-2010-p-153686147.html
  6. ↑ https://store.briancrower.com/products/bc2220-1?variant=13489835540545
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