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HKS Forged Pistons and Connecting Rods for Nissan GT-R

August 6th, 2010

HKS have released their awaited forged pistons and conrod package for the VR38 engine recently as a compliment to their GT800 turbine upgrades. Designed to offer high durability, the HKS pistons are also designed to cope with much more power than standard.

Before getting too steeped in the technical specs, let’s run over the highlights of the HKS forged piston product. These pistons offer the same bore x stroke of the OEM pistons meaning the same displacement volume and that they’re a direct fit. What does change is the crown volume (concave) which increases from 4.49cc per cylinder to 8.01cc. This has the effect of decreasing the compression ratio from the standard 9.0 down to 8.7. Thanks to the forged hollow channel construction, the HKS pistons also weigh in at 25 grams less than the OEM items (420g vs 445g).

For full specs for the pistons and the conrods see the data below from HKS. For pricing, contact your HKS distributor for local pricing but expect to pay around 367,500 yen if you’re in Japan for the full set.

  HKS Product OEM
Bore x Stroke 95.5 X 88.4mm 95.5 X 88.4mm
Compression Ratio 8.7 9.0
  Gasket Thickness HKS t 0.8 t 0.80
Total Displacement (cc) 3799 3799
Piston Bore 95.5 same
Compression Height 34.30 mm same
Concave Crown Volume 8.01 cc 4.49 cc
Material Forged (hollow channel) Cast (hollow channel)
Reference Weight 420 g 445 g
Pin Dimensions 23 X 60mm 23 X 62.5mm
Rings Dimensions TOP B 1.2 mm same
Dimensions SEC B 1.2 mm same
Dimenstions OIL B 2.0 mm (3 pieces) same
Conrod Small End Dimensions 23mm same
Big End Dimensions 59mm same
Length 165.1mm same
Material SCM treated Cast Steel
Reference Weight ~722 g ~724.6 g
Weight Variation less than 1.0 g
Bolt M9 X P1.0 / 14.9T same

Link: HKS Forged Pistons and Connecting Rod Release

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Mine’s Super Response Complete Engine and Turbos Launched, Priced

August 4th, 2010

Well it’s been quite a while since we got to experience first hand this Super Response monster that Mine’s have born out of their Yokosuka workshop. The time has finally come though that the Mine’s VR38 is ready to officially go on sale with full published specs.

We have said much of the emotional and overview stuff back in our January first impressions so those that are truly interested in this beast should go back and review our article from then to get a feeling of how it goes.

Link: Mine’s Complete Engine First Impressions by GTRBlog.com

If you’re interested just in the raw numbers and specs, here they are straight from Mine’s. First up let’s talk pricing. The Super Response Complete Engine will cost you 3,465,000 yen in Japan provided you trade your original OEM engine. If you can’t supply an engine then Mine’s can supply one for you but at a total cost of 5,565,000 yen in Japan.

Add the Mine’s Super Response Turbines to these and you’re looking at 3,990,000 yen with OEM turbo trade-in or 6,615,000 yen without engine or turbine trade in at the upper end of the scale.

For that money you get a out of the box engine utilizing all of Mine’s know how including…

Mine’s R35 GT-R Super Response Complete Engine
Part Material / Specifications
Cam Gear Lightened
Cam Shaft Shore Pro IN 256°/ LIFT 10.2 mm
EX 264°/ LIFT 10.5 mm
Shim Space Adjustment
Valve Spring Uniform Rating
Valve Guide Phosphor Bronze
Valve Seat Resurfaced
Seating Modified
Valve Re-surfacing Modified
Port Surface Smoothening Modified
Ignition Chamber Machining Modified
Head Polishing Modified
Head Deburring Deburring
Head Gasket Original Metal Gasket
Head Bolt WPC Application
Crank Cap Bolt WPC Application
Piston Original Forged Wrought Aluminum Alloy Pistons
Connecting Rod Super Light Weight Titanium
Connecting Rod Weight Detail Minute Balancing
Crank OEM Modified/Lightened
Dyanamic Balance
WPC Application
Crank Pulley Balancing
Crank Bearing WPC Application
Block Polishing Polishing
Block Deburring Deburring
Thermostat Low Temperature Thermo(68 degrees C)
Spark Plugs NGK(#9 equal)

Mine’s Turbine Data Sheet
TURBINE WHEEL NAME GT-R OEM MINE’S ORIGINAL
COMPRESSOR SIDE BACK SIDE DIAMETERf(mm) 56.0 71.00
INLET DIAMETERf(mm) 43.4 51.20
TRIM VALUE 60 52
NUMBER OF BLADES 12 12
TURBINE SIDE (EX) BACK SIDE DIAMETERf(mm) 53.0 52.85
EXHAUST DIAMETERf(mm) 39.8 46.07
TRIM VALUE 57 76
NUMBER OF BLADES 9 9
CUT BACK PRESENT
POSSIBLE POWER OUTPUT (PS) approx 600 ps approx 800 ps
PRICE 526,000 yen 690,000 yen
REMARKS STOCK TURBINE TRADE-IN

For more information on all of the above, or to contact Mine’s, head over to their website linked below…

Link: Mine’s R35 GT-R Super Response Complete Engine Website (English)

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Gruppe-S VR38 Stroker Crank Officially a Work In Progress

February 18th, 2010

When the Hankook Dynamic AutoSport Gruppe-S Nissan GT-R drift car debuted at SEMA in 2009 we were fortunate enough to get an advanced preview from Dynamic Autosport’s Eddie Kim on what we could look for in terms of GT-R development. He mentioned that on top of the drift car’s chassis development they’d also be putting some focus on the VR38 development itself.

While they aren’t set on using the VR38 in the drift car just yet, (they’ll most likely be opting for a worked VQ engine), they’re very much going to be developing parts for it including a 4.0 – 4.3 liter stroker kit.

First up in the development of such a kit is to build a crank. That’s what’s happening right now and is expected to be completed in around a week. Pistons and rods up next we suppose and it should all slide nicely into their sleeved block. Should be an interesting competitor to the existing JUN 4.0 liter stroker kit which is quite a pricey item…

Link: Gruppe-S Blog

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Forged Performance’s First Set of Arias FP Spec Pistons for Nissan GT-R

December 29th, 2009

Forged Performance have been seeing great results using Arias FP Spec pistons in their VQ motor builds for years now so they decided to spec out and order a set up for a VR38DETT build they’re carrying out for a customer.

These are made from Zero Silicon Aluminum for maximum strength and feature tool steel offset wrist pins, and a pressure seal groove. They’re moly coated for lower friction and are capable of supporting a 1000hp build. The specs are 95.5mm, standard bore and built for a 9.0:1 comp ration.

Forged have these in stock in 95.5m so if these sound like something that might interest you, hit up the guys at Forged Performance to have a chat to see how they can help you…

Link: Forged Performance Website

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