BiTurbo228

Thanks yeah I've done a lot of maths vis-a-vis weight distribution. The battery I have is 18.6kg, so swapping that to the rear does a lot to offset the weight of the 6. I'd rather not mount it further backwards myself. It's an elegant solution, but I wanted to see if it could be done without it. The point behind the alloy bits is they take weight off the front of the car where it's needed. Taking out the spare wheel reduces the weight, but does so in the wrong place and you end up with an even more nose-heavy car. I'm not planning to get most of the little alloy bits that only save a couple of grams, but the front and back engine plates I'll get, same with the water pump and housing (partially because the alloy pumps are a better design). With all the various little bits I'm getting, and weight I'm shifting around, I should have a 54/46 weight distribution (compared to a 56/44 for the stock Spitfire). That's some very loose maths there, for instance I haven't taken into account how far away from the various axles the lightweight bits are, but with a 2% margin for what I was aiming for (stock Spitfire distribution) I think I should be ok.

Thanks I'm doing the same with my little MkIV. I'll be updating it as I go along and weigh more things.

As a part of my Spit6 conversion/restoration, I've put a good deal of effort into trying to offset the weight of the big 6-cylinder hanging out over the front axle. So, I've been weighing a lot of the bits that need to be changed, and researching the various weight saving bits and pieces you can get for these cars. I thought a list of these might be quite useful posted here Whole car weights are the kerb weights advertised by the factory and engine weights are 'fully dressed' . Anything in italics is something I've weighed myself and anything in normal text is garnered from the internet. Feel free to add anything you know about in the comments. It's far from comprehensive at the moment Cars Spitfire 4 - 712kg Spitfire MkII - 711kg Spitfire MkIII - 711kg Spitfire MkIV - 734kg Spitfire 1500 - 790kg GT6 MkI - 864kg GT6 MkII - GT6 MkIII - 863kg Engines 1100 OHC - 1300 OHC I4 early - 1300 OHC I4 late - 125kg 1500 OHC I4 - 2.0l OHC I6 - 2.5l TC OHC I6 - 2.5l PI OHC I6 - 183kg 1850 Slant 4 - 132kg 2.0l Sprint I4 - 140kg 3.0l Stag V8 - 202kg Engine Parts Stock rocker cover (6-cyl) - 1.046kg Alloy rocker cover (6-cyl, Rimmerbros) - 1.419kg Steel backplate (TR6) - 5kg Alloy backplate (TR6, Canley Classics) - 2.4kg Steel frontplate (GT6) - Alloy frontplate (GT6) - 1.25kg less Cast iron alternator bracket (6cyl) - 1.05kg Alloy alternator bracket (6cyl, Canley Classics) - 0.32kg Cast iron alternator adjuster - 0.59kg Stainless alternator adjuster (Canley Classics) - 0.29kg Cast iron distributor pedestal - Alloy distributor pedestal (Canley Classics) - Spitfire MkIV flywheel - 7.6kg 2500PI flywheel - 12.3kg Lightened steel flywheel (Chris Witor) - 6.3kg Stock alternator (TR6) - Lightweight alternator - 1.95kg less Stock starter (Spitfire MkIV) - Stock starter (TR6) - High-torque starter (TR6) - 2.4kg less Cast iron water pump (6cyl) - Alloy water pump (6cyl, Canley Classics) - 1.5kg less Cast iron water pump housing (6cyl) - Alloy water pump housing (6cyl) - 1.4kg less Exhausts 2500PI manifold - 5.6kg Centre section (Spitfire MkIV) - 0.9kg Backbox (Spitfire MkIV) - 5.6kg Gearboxes Spitfire 3-rail non-overdrive gearbox - 34.5 TR6 overdrive gearbox - 41.1kg Radiators Spitfire radiator (full length) - Spitfire radiator (reduced length) - 5.528kg GT6 radiator - Alloy GT6 radiator - 3.317kg Body Panels Steel Spitfire bonnet (MkIV) - 28kg Fibreglass bonnet (GT6) - 12kg Steel hardtop - Fibreglass hardtop - 10.2kg Soft top - 8.5kg Steel valences (2) - 4kg Fibreglass valences (2) - 2kg Suspension, Diff & Hubs Swing axle rear (per side) - 11.5kg Rotoflex rear (per side) - 19.5kg Canley Classics CV conversion rear (per side) - Cast iron vertical link (each) - 4kg Alloy vertical link (each, Canley Classics) - 1.5kg Cast iron rotoflex wishbone (each) - Alloy rotoflex wishbone (Canley Classics) - Steel upper front wishbones - Tubular upper front wishbones - 0.5kg less Cast iron front hub (Spitfire) - Alloy front hub (Canley Classics) - 0.8kg Cast iron diff casing - 6kg Alloy diff casing - 2kg Chassis Cast iron steering rack mounts (2) - 0.566kg Alloy steering rack mounts (2) - 0.288kg Brakes GT6 caliper (each) - 4.5kg Billet alloy caliper (each, Canley Classics) - 1.8kg Cast iron caliper brackets - Alloy caliper brackets (Canley Classics) - Cast iron rear drum (Spitfire) - Cast iron rear drum (GT6) - Alfin drum (Spitfire, Canley Classics/Rimmerbros) - 1.36kg less Wheels Spitfire MkIV steel wheels (5J x 13, each) - 6.35kg Spitfire MkIV steel wheels + 155/80 tyres (each) - 12.2kg GT6 steel wheels (5.5J x 13, each) - Cosmic Mk2 alloys (5.5J x 13 each) - 6.8kg Cosmic Mk2 alloys + 165/75 tyres (each) - 13.3kg Dunlop racing magnesium alloys (each) - 4kg

michael_charlton wrote: Which one? The full width 21" one? I had the smaller width MkIV radiator in mine. I'm trying to work out if I can offset the added weight of the Triumph 2.5l I've bought with lightweight bits.

Has anyone weighed a stock Spitfire radiator? I'm trying to find out whether the alloy one I've got is any lighter or heavier, but I've scrapped my old duff one before weighing it :S