Spitfire Engines

 

Triumph 4 cylinder Engine Rebuild

At Performance Research Industries, we have been applying our tried & true endurance racing techniques to all Triumph engine rebuilds with astonishing dyno and racetrack results. We know these engines and their faults and address them in the process so you end up with a more powerfiul, more efficient and reliable engine.  Our Stage One rebuild nearly doubles the horsepower of these engines in their original state. Race development is the street cars friend as it gains from "trickle down" technology. In other words, we know what survives under racing conditions the "proving grounds" if you will and if it can be applied to street use it is. Our engines out last all others because we use our own products internally, products that we know from other suppliers are not worthy or up to our standards.
In 2001 Steve Smith won the VARA championship (Vintage Auto Racing Association) in dominating fashion with a fully prepared PRI cylinder head and full PRI exhaust system. Chris also final tuned the engine and chassis for Steve netting him over 6 seconds from his previous best lap at ButtonWillow Race Way California. Prior to this Steve had campaigned his GT6 for 9 years with a best 10th place in the standings. This proves that the level of our products and capabilities are truly second to none.

 

STAGE 1 ENGINE REBUILD

All our engines including the stage 1 are precisely machined and meticulously assembled. They are built with care and attention to detail like no others offered.

Cylinder Head Work

  • Hot tank cleaning
  • Magnafluxed for cracks
  • Blend porting
  • Performance valve job
  • C.C. combustion chambers and Surface head to desired compression ratio
  • Rebuild rocker assembly
  • New rocker shaft
  • New rockers
  • New valve guides
  • New intake and exhaust valves
  • New valve springs
  • New spark plugs
  • New freeze plugs
  • New paint
  • New hardware if needed
  • New gasket set

Block Work

  • Hot tank cleaning
  • All parts magna-fluxed for cracks
  • Line bore main saddles if needed
  • Rebuild rods, resized big end, re-bushed small end, polish beams, match weights
  • Bore and hone cylinders
  • Turn (if needed) and polish crankshaft
  • Regrind camshaft
  • Degree camshaft
  • Set piston deck height
  • Match piston weights
  • Balance crank assembly  
  • New piston set
  • New rod bushings, bearings and bolts
  • New cam bearings if applicable
  • New main and thrust bearings
  • New lifters
  • New cam chain (gear if needed)
  • New oil pump
  • New water pump
  • New seals and gaskets
  • New oil galley plugs
  • Paint
  • Freeze plugs

*This price does not include re-sleeving block if necessary.

A new clutch assembly is recommended for balancing with the newly rebuilt crank assembly. P.R.I. warranties only non-upgraded stage 1 engine packages on a "conditional" 12 months or 12,000 miles. 

All parts for the stage 1 rebuild are o.e. type and not P.R.I. parts. All P.R.I. parts are discounted 10% with in-house precision rebuilds for performance upgrading.
(Any performance upgrades other than what is listed below will void this warranty) 
 

Extras!

  • CARBURETION: Single Weber, 2 barrel draft progressive. Keihin CR, side draft quad set 31mm only.
  • EXHAUST SYSTEMS: Any header and free flow exhaust is OK but must be in optimum condition. We currently offer "modified" PaceSetter headers and our own tuned performance exhaust systems.
  • P.R.I. modified PaceSetter header  
  • P.R.I. performance exhaust systems for Spitfire
  • Replacement catalytic converters  

Catalytic converter systems: must be new with no cracks in manifold, or replaced with a performance header. We have after- market rebuilt cats for those unfortunate cars that may still require them.

Speciality Built Engines - Stage 1, Triumph SPITFIRE = $4,945.00 USD

Please call if you are seriously interested. 281-881-8476

 Triumph Spitfire Cylinder Head

 

STAGE 1 "PLUS" ENGINE REBUILD

Includes everything in the Stage 1 Engine Rebuild above, but for more zip, we throw in:

  • 10/1 compression
  • Lightened flywheel
  • Stage 2 cam

Speciality Built Engines - Stage 1 PLUS, Triumph SPITFIRE = $5,700.00 USD

Please call if you are seriously interested. 281-881-8476

 

STAGE 2 ENGINE REBUILD

All that is done on the Stage 1 Engine Rebuild plus the following:

Cylinder Head Work

  • Extreme performance cylinder head conversion kit
  • Roller rockers chose from 1.55 or 1.65 ratio
  • Maximum port work flow bench tested

Block Work

  • Complete engine ARP hardware set
  • Exterior oil line to feed rocker shaft
  • Stock rods are lightened, polished and shot peened
  • Light tubular push rods
  • Lightened lifters
  • Lighten flywheel

Additional parts 10% Discount 
(with the exception of the ARP hardware already discounted)

Speciality Built Engines - Stage 2, Triumph SPITFIRE = $7,245.00 USD

Please call if you are seriously interested. 281-881-8476

High Performance Cylinder Valve Kit

 

STAGE 3 ENGINE REBUILD


Professional Race Application

All that is done on the Stage 2 Engine Rebuild plus the following:

Cylinder Head Work

  • P.R.I. Pro comp series head conversion kit (Titanium valves available)

Block Work

  • 4340 Chrome Moly steel, or Titanium connecting rods.  PRI designed
  • ltra-light JE piston set with gapless low friction ring package
  • PRI Stage 3 cam
  • PRI tubular Chrome Moly "heat treated" push rod set
  • PRI crank case venting kit w/K&N filter

Stage 3 engines are also built in street-able specification.

Speciality Built Engines - Stage 3, Triumph SPITFIRE = $11,500.00 USD

Please call if you are seriously interested. 281-881-8476

PRO-SERIES STRICTLY RACE ENGINE REBUILD

We have decades of experience and proven race performance. Let's talk.




We do not email info about our engines. 
Please call if you are seriously interested. 281-881-8476