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 I

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 II

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 III

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 not be sufficient to run the Stage III engine.

SPECIFICATIONS


Stage I
Base Engine:​​ L28
Bore X Stroke:​​ 86 ~ 87mm bore x 79mm stroke
Pistons:​​​ New 280ZX style Flat top pistons
Rods:​​​ L28 rods
Crankshaft:​​ L28 crankshaft
Cam: ​​​DSI Stage I street cam, 274 duration, .480 lift
Valve train:​​ DSI Street high performance valve springs & retainers
Compression:​​ 10.2~10.7 : 1​
HP:​​​ Approximate 150-180HP*

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 II street cam, 270-290 duration, .480+ lift
Valve train:​​ DSI Street high performance valve springs & retainers
Compression:​​ 10.2~10.7 : 1​
HP:​​​ Approximate 170-200HP*

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 II street cam, 290 duration, .490 lift
Valve train:​​ DSI Street high performance valve springs & retainers
Compression:​​ 11~12: 1​
HP:​​​ Approximate 190-250HP*

BASE PRICE

Stage I starting at $3850
*Optional and recommended: New OEM rocker arms:​$466
Stage II starting at $5150
*Optional and recommended: New OEM rocker arms:​$466
Stage III starting at $6350
*Optional and recommended: New OEM rocker arms:​$466, Adjustable cam sprocket: $250
FAQ, Engine Cores, and Horsepower
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.