STR Series (Stage-1, Stage-2, Stage-3)

STR Series
Our STR (Street Series) L28 Engines provide a way for the enthusiast to replace their old engine with a sharp new package capitalizing upon years of L-Engine experience and engineering improvements. We offer three variations of the STR Series and are happy to help you determine which setup is right for your needs.

STR VERSIONS

Stage 1
Our Basic Package.

A higher compression street L28 engine with a set of new oversized 280ZX style flat top pistons, street cam, and valve train upgrade, this engine gives a quicker responsiveness and a bit more power over stock L28, but not too crazy. The difference between a stock L28 and our Stage I is quite apparent, but it is not so much as to say that it is night & day. If you are looking to just overhaul your stock engine and while at it want to spice it up a little, then this may be the package. This setup works well with SU carbs, stock L28 fuel injection system, or triple carbs as well.

Stage 2

Life gets more interesting.

The Datsun Spirit high compression pistons allows even higher lift camshaft than that of the Stage I engine, without the valves colliding the pistons. More cam, more power. The difference between the Stage I (stock 280ZX pistons) and the Stage II are quite significant and quite noticeable. The weight difference of the Stage I and the Stage II pistons are significantly lighter, rings are much more efficient in delivering combustion and dissipating heat, thus drastically improving performance, responsiveness, and fuel economy. This setup works well with SU carbs, stock L28 fuel injection system, or triple carbs as well.
* Stage-2 comes with a Black Engine plaque, and a signed Certificate of Authenticity.

Stage 3

Hit the Street and the Track.

Our Stage III is, in concept more like our STD series, except that it does not go so far in details and thus it won’t break your bank. Our Stage III engines adopts the improved rod/stroke ratio theory, and it comes equipped with the Datsun Spirit ultra light pistons and the H-beam rods. These are so much stronger than the stock L28 pistons & rods, feather light compared to even our Stage II setup, and dramatically improved the rod/stroke ratio , thus allowing the engine to spin so effortlessly and super responsive. Everyone knows that translates to improving more performance, more responsiveness, and additional fuel economy. This setup works well with triple carburetors or Datsun Spirit Throttle Body Fuel Injection System. SU carburetors may be used but SUs may not be sufficient to pull the maximum power out of it.
* Stage-3 comes with a Bronze Engine plaque, and a signed Certificate of Authenticity.

SPECIFICATIONS

Stage I
Base Engine:​​ L28
Bore X Stroke:​​ 86 ~ 87mm bore x 79mm stroke (*Limited availability while the ZX flat top pistons last)
Pistons:​​​ 280ZX style Flat top pistons
Rods:​​​ L28 rods
Crankshaft:​​ L28 crankshaft
Cam: ​​​DSI Stage I street cam,
Valve train:​​ DSI Street high performance valve springs & retainers
Compression:​​ appx 10: 1
HP:​​​ Approximate 150-180 rear wheel HP*
Pump gas (93 octane) ready.

Stage II
Base Engine:​​ L28
Bore X Stroke:​​ ​87mm bore x 79mm stroke
Pistons:​​​ DSI L28 pistons (CH=38.1mm)
Rods:​​​ L28 rods
Crankshaft:​​ L28 crankshaft
Cam: ​​​DSI Stage 2 street cam,
Valve train:​​ DSI Street high performance valve springs & retainers
Compression:​​ 10.5~11 : 1​
HP:​​​ Approximate 150-190 rear wheel HP*
Pump gas (93 octane) ready.

Stage III
Base Engine:​​ L28
Bore X Stroke:​​ 89mm bore x 79mm stroke
Pistons:​​​ ​DSI L28 pistons (CH=29mm)
Rods:​​​ DSI H-Beam rods
Crankshaft:​​ L28 crankshaft
Cam: ​​​DSI Stage 3 street cam,
Valve train:​​ DSI Street high performance valve springs & retainers
Compression:​​ 11~11.5: 1​
HP:​​​ Approximate 190-250 rear wheel HP*.
Pump gas (93 octane) ready.

BASE PRICE (New pricing for 2018 to reflect cost increase)
Stage I starting at $3950
*Optional and recommended: New OEM rocker arms:​$587.04
Stage II starting at $5300
*Optional and recommended: New OEM rocker arms:​$587.04
Stage III starting at $6500
*Optional and recommended: New OEM rocker arms:​$587.04, Adjustable cam sprocket: $250

** We can do the State-1, 2, and 3 on L24 and L26 engines also.
** If using E31, E88, and some very early N42, most of these heads have brass intake valve seats. They will need to be replaced with hardened steel seats. (additional cost)
** E31, E88, P79, P90 and P90a heads require use of our Swirl polish valves (sold separately).
** P79, P90 and P90a will require thicker valve spring shims ($60 additional)
** P79, P90, and P90a will need .080″ cam tower spacers to do Stage-1 and Stage-2. (This cost is included in Stage-3).

FAQ, Engine Cores, and Horsepower

The engine price is for a bare engine (Fully assembled engine, with valve cover, oil pan, and oil pump). It does not include any peripheral parts (i.e. carburetors, exhaust, ignition system, harmonic damper, water pump, alternator, starter, flywheel, clutch, thermostat, etc) but are offered as optional items (We have most everything in stock).
We also highly recommend using new rocker arms (sold separately), and in the case of Stage-3, fully adjustable cam sprocket is recommended for fine adjustment of valve timing.

The listed engine prices do not include core engine charge, installation, setup, tuning, or shipping. Please see our Frequently Asked Questions for answers to common questions about our motors and additional modifications necessary for your new DSI motor. Additionally, please read about sending and obtaining Engine Cores, and our Note on Horsepower for why our stated horsepower figures are guidelines, not quotes.
Prices are subject to change without announcement.