Throttle Bodies and Parts

Our Reconditioning Process

We recondition TR6 CR manifolds as part of our CR to CP throttle linkage conversion kit – for more details click here. As we have the equipment, we also recondition CP throttle bodies and we can supply most of the parts we use if you want to recondition your own. We plan to increase our range to include reconditioned standard CR and 2.5PI throttle bodies in the future. Our reconditioning process includes:

  • Stripping of throttle bodies
  • Cleaning and glass bead blasting of castings
  • Inspection of castings for severe pitting, cracking or damage
  • Skimming of manifolds flanges to remove high spots/distortion
  • Installation of Helicoils where required
  • Reaming of spindle bores to remove any high spots or carbon
  • Fettling and installation of spindles – these are a few thou oversized which is usually more than enough to take up any wear
  • Fitting of butterflies in original positions, even if this means the alignment marks are facing inwards
  • Centring the butterflies and securing the stainless screws with high strength thread lock
  • Fitting of new return springs and lever arms. Note – all CP manifolds are fitted with earlier style lever arms that enable future arm and spring replacement without disturbing the butterflies
  • Fitting of replated or new intake pipes, balance pipes and blanking plugs
  • Installation of new or replated idle air valves
  • Installation of new or replated hose connectors and blanking plugs
  • Attachment of new stainless injector keep plates
  • Standing back and admiring how good they look – it puts a smile on my face every time!

Additional Options For Reconditioning

Butterfly spindles running through a sealed bearing installed in the casting at the lever arm end. The wear on spindles always starts here and is then passed on to the middle and then far end of the spindle. If you stop the wear starting at the lever end, you stop it all. If you have bearings installed, detachable lever arms are a must to enable the levers to be replaced when they eventually wear. I fitted a set of these bearings to my own car 10 years ago, I’m on my second set of lever arms but still no wear on the spindles!
Keep plate threads drilled out and replaced with stainless steel Helicoils. The Helicoils are a much stronger alternative than the original threads in the aluminium bodies.
Checking the butterfly seals on our test engine. Rebuilt throttle bodies always leak a little air around the butterflies until the carbon seal builds up. As such, idle speed may be higher than normal until this occurs. If you would like a set of manifolds tested prior to purchase to see how well they seal we can do this for you, and send you a video of the test and the vacuum readings – see here.

Note: all of our throttle body castings are supplied in bare metal as original. Paint is not applied to conceal any defects or repairs.

Throttle Bodies, Parts and Prices

Refurbished Rare and Early TR5 Throttle Bodies

Refurbished Original TR5 Throttle Bodies

Rare as hen’s teeth. Most fully restored TR5s sold as concourse have TR6 throttle bodies fitted! These throttle bodies come complete with a new early type idle air valve. Refurbished to original spec with spindles running directly in the castings and original keep plate threads. Idle air valve can be removed and sprung screw adjusters fitted to lever arms if you want the early original TR5 set up. £150 trade in for your CP throttle bodies if they are suitable for reconditioning.

£1,000 outright sale

Later TR5 Refurbished 1DD Throttle Bodies

1DD matching castings with spindles running in directly in castings as original and original keep plate threads. These throttle bodies can be supplied with TR5 or TR6 idle air valves fitted. £150 trade in for your CP throttle bodies if they are suitable for reconditioning.

£800 outright sale

TR6 Refurbished DD2 CP Manifolds – SOLD

DD2 matching castings with spindles running through sealed bearings installed at lever arm end of spindle and Helicoils installed in keep plate mountings. These throttle bodies can be supplied with TR5 or TR6 idle air valves fitted. £150 trade in for your CP throttle bodies if they are suitable for reconditioning.

£650 outright sale

TR5 Idle Air Valve

TR5 Idle Air Valve / TR5 Air Bleed Valve and Fittings

TR5s were supplied without idle air valves. Tick over was obtained using set screws on each butterfly spindle lever.

However, this was not an effective system and dealers retro-fitted factory supplied idle air valves. These took air from a hose connector installed behind the air filter. There was only a single hose connection of TR5 plenums.

TR5 Idle Air Valve Connected

These idle air valves have been made to the original specification and can be fitted to those 5s that never had one originally, or can be used to replace the TR6 idle air valves that have been fitted to many 5s.

If you are fitting one to a TR5 for the first time, we can also supply a hose connector that can be installed behind the air filter as original. If you are replacing a TR6 idle valve we can supply a hose that enables connection to the TR6 plenum as above.

TR5 Idle Air Valve Remanufactured – £75

TR5 Idle Air Hose Connector for Installation in Air Filter Holder – £15

TR5 Idle Air Valve to TR6 Plenum Air Hose – £16

TR6 Idle Air Valve / TR6 Air Bleed Valve

Remanufactured in brass as the originals except our bodies are turned on the lathe rather than cast. Supplied with zinc yellow passivate adjustment screw and spring.

TR6 Idle Air Valve Remanufactured – £50

CP Butterfly Spindle Return Springs

Original specification butterfly spindle return springs. Galvanised finish with uniform factory finished ends. Made for us by an established British spring maker.

CP Butterfly Spindle Return Springs – £15 for set of 3

CP Butterfly Spindles

Original butterfly spindles are 5/16″ (7.95mm). We make our own butterfly spindles in house from 8mm brass rod which is 0.05mm bigger than standard. These fit our bearing upgrades but also allow us to take up any wear when refurbishing throttle bodies to original spec. Whilst this doesn’t sound much, each spindle has to be fettled to fit each manifold. They are not a direct fit for original spindles. As such, our butterfly spindles are not for resale.

CP Butterfly Spindles – workshop use only, not for resale.

Butterfly Spindle Lever Arms

Early CP bolt on butterfly spindle arms. Laser cut and plated. Set of 3. Made to original spec so can be used with your existing spindles. Those for early cars are drilled and tapped as per the originals.

Set of 3 CP Butterfly Spindle Lever Arms – £24

Manifold Brightwork

If you are rebuilding your own throttle bodies, why not replace the shiny bits. Replated or new inlet pipes, balance tubes, hose connectors and blanking plugs for CP and CR throttle bodies. Rather than throw away the old inlet tubes and balance pipes, we have tools that can remove them without damage. The same goes for the hose connectors, if they are undamaged and uncorroded, we blast and polish them before sending them off for replating. If any are not suitable for re-use or missing we make new.

Manifold Brightwork – £50 (if hose fittings and blanking plug are exchanged)
Manifold Brightwork – £75 (outright sale)

Injector Keep Plates Stainless Steel

Stainless steel injector keep plates, bolts and spring washers. Set of 3. Note our bolts longer than standard to spread the load over all of the threads in the casting.

Set of 3 Stainless Steel Keep Plates, Bolt and Washers – £18