Puglet1 Posted May 21 Report Share Posted May 21 So. Sat here thinking I would like a bit more power from my Vitesse. Everyone says the best route to get more power in a Mk2 Vitesse is to go 2.5. Question is…. Which 2.5 engine is required and how do I identify the engine by its number? My current engine is really sweet so can it be converted to 2.5 and if so how? Looking for approximately 150 BHP. Is this achievable and if so what additional ancillaries are required…eg carbs, exhaust etc? I see a few people on here saying they have this type of conversion but another question is…..how much did it cost? Any suggestions ? Thank you. Pete. Link to comment Share on other sites More sharing options...
JohnD Posted May 21 Report Share Posted May 21 Pete, That's what I have in SofS. A 2.5 - actually 2.6. Any 2.5 will do, if you work on it. Saloon engine, and s need a Vitesse backplate as they were canted. You could just use your 2L, with a 2.5crank, and rods, and camshaft, but the 2L sump needs relieving to clear the longer throw. Tubular manifold, Pi fuelling, all possible, but I've now got 170bhp and the gearboxes won't stand it for long. John 1 Link to comment Share on other sites More sharing options...
Puglet1 Posted May 22 Author Report Share Posted May 22 John. That’s really helpful. I am in no hurry to do this but it’s useful to know what components are needed just in case something comes up. Thank you. Pete. Link to comment Share on other sites More sharing options...
Firefly Posted May 22 Report Share Posted May 22 You could just use your 2L, with a 2.5crank, John are you sure this is possible?? As I understand it the extra 1/2 litre was gained by increasing the stroke not the bore, by adding an extra 12mm approx. to the top of the block, with the increased stroked crank, the same conrods were used on both capacities. My 2 litre when on T.D.C. the piston is flush with the top of the block. So if you fitted a 2.5 litre crank to a 2 litre block the piston would pop out of the block, or ram into the head if fitted. Mac Link to comment Share on other sites More sharing options...
Steve P Posted May 22 Report Share Posted May 22 (edited) I too converted my Vitesse to 2.5.It is a MK 1 so because the engine is breathed on considerably it ate a rear drive shaft on the 2012 RBRR in Cornwall. I converted to the Jones/Bowler CV setup around 2013. It also has a big saloon O/D gearbox to handle the extra grunt, it made 172bhp on a rolling road when built. Also a 3:27 diff for better cruising, around 2900 rpm @ 70mph in O/D top and a custom prop with 100m flanges and stronger U/J`s. It started as an MG engine (MK 2 PI) and runs a TR5 cam and still on SU`s. MIke the Pipe 3-2-1 manifold and custom made exhaust by ex BTCC Matt Simpson race exhausts. Steve Edited May 22 by Steve P 1 Link to comment Share on other sites More sharing options...
DanMi Posted May 22 Report Share Posted May 22 23 minutes ago, Firefly said: You could just use your 2L, with a 2.5crank, John are you sure this is possible?? As I understand it the extra 1/2 litre was gained by increasing the stroke not the bore, by adding an extra 12mm approx. to the top of the block, with the increased stroked crank, the same conrods were used on both capacities. My 2 litre when on T.D.C. the piston is flush with the top of the block. So if you fitted a 2.5 litre crank to a 2 litre block the piston would pop out of the block, or ram into the head if fitted. Mac The piston No.s are different. So the 2000 pistons are taller. (I have a 4Cyl where the 1500 has different pistons to the mk4 1300 though block almost identical) 1 Link to comment Share on other sites More sharing options...
JohnD Posted May 22 Report Share Posted May 22 (edited) Firefly is, of course, correct! My point to the OP was that the block is the same. It's what's bolted on that makes it a 2.5. A 2.5 Vitesse or GT6 would have been real competition for the TR6, which is why Triumph never did it. While the additional torque is significant, the stroked engine is not one to rev more than 6K for long, as then the mean piston speed exceeds safety. John Edited May 22 by JohnD 1 Link to comment Share on other sites More sharing options...
Firefly Posted May 22 Report Share Posted May 22 Thank you John, thought for a minute my imagination had taken over, or had lost my marbles.......probably both.😵 1 Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 22 Report Share Posted May 22 its quite simple if you stroke a base engine then the gudgeon pin position has to change hence different piston part numbers for 1500/2500 stroked engines Pete 1 Link to comment Share on other sites More sharing options...
johny Posted May 22 Report Share Posted May 22 Cant see much point coverting a 2L as even if Petes existing is 'really sweet' by the time you replace crank and pistons its basically a different engine! 1 Link to comment Share on other sites More sharing options...
Steve P Posted May 22 Report Share Posted May 22 Think about maybe improving the engine you have? exhaust/ignition/induction/efi etc are all do-able fairly cheaply compared to building another engine which nowadays is £££££ if you cannot build it yourself. Depends what you want from the car and how you drive it. S 1 Link to comment Share on other sites More sharing options...
Iain T Posted May 22 Report Share Posted May 22 (edited) Or on the other hand keep your 2 litre and change the camshaft, fit electronic ignition, sort the head out and plug on three Jenvey Heritage throttle bodies. Complete control over mixture giving good economy and fuel when needed plus it would look great! I bet that setup would outrun a poorly setup carburettor 2.5. Iain Edited May 22 by Iain T 1 Link to comment Share on other sites More sharing options...
Iain T Posted May 22 Report Share Posted May 22 1 minute ago, Steve P said: Think about maybe improving the engine you have? exhaust/ignition/induction/efi etc are all do-able fairly cheaply compared to building another engine which nowadays is £££££ if you cannot build it yourself. Depends what you want from the car and how you drive it. Steve, you got there 10 seconds before me! 1 Link to comment Share on other sites More sharing options...
Puglet1 Posted May 22 Author Report Share Posted May 22 ALL. Thank you very much for your contributions to this post. I will now spend the next stage of my life doing the research to follow the options you’ve given me. Pete. Link to comment Share on other sites More sharing options...
Iain T Posted May 22 Report Share Posted May 22 1 hour ago, Puglet1 said: will now spend the next stage of my life doing the research to follow the options you’ve given me Also consider discrete fuel injection via a manifold and keep your Strombergs. Classic fuel injection in I think Chelmsford sells the system. Iain Link to comment Share on other sites More sharing options...
Puglet1 Posted May 23 Author Report Share Posted May 23 Hi Iain. I will check them out. 👍 Link to comment Share on other sites More sharing options...
JohnD Posted May 23 Report Share Posted May 23 RE, above points on modifying a 2L. A 2.5 cylinder head. With the thinner 2L head and the longer stroke, your CR will be about 14. But if your 2L had domed pistons, you can use the original head! The domes allowed Triumph to use the same heads for 2L or 2.5L! John 1 Link to comment Share on other sites More sharing options...
gt6chris Posted May 31 Report Share Posted May 31 I am just building a new engine for my TR6 using a late triumph 2000 block. Both the TR6 (Vertically mounted) and Triumph 2000 (canted over) back plates seem the same with the same part number 211505. I believe the difference is just the front mountings on the saloons which are on the front moutning plate as apposed to being fitted on the side of the block in TR6, Vitesse, GT6. Chris Link to comment Share on other sites More sharing options...
JohnD Posted May 31 Report Share Posted May 31 I think you must be wrong! Else the 2000 gearstick would be canted over with the engine, into the drivers left kidney. John Link to comment Share on other sites More sharing options...
gt6chris Posted June 1 Report Share Posted June 1 Hi John, I don't think so. Both the saloon and tr5/6 use the same back plate. Not sure how it all works in a saloon but its not the backplate that is different https://www.ebay.co.uk/itm/116034557941?gad_source=1&mkevt=1&mkcid=1&mkrid=710-53481-19255-0&campid=5338723872&toolid=20006&customid=3fAJc58eAAAA1MYOBQSqetzQoQpDAAAAAA Chris Link to comment Share on other sites More sharing options...
JohnD Posted June 1 Report Share Posted June 1 At home, I have at least one of each. I'll check when I get there. John Link to comment Share on other sites More sharing options...
JohnD Posted June 2 Report Share Posted June 2 (edited) All, These are two six cylinder back plates on a sheet of bright galvanised steel. On top is one from an upright mounted engine, Vitesse/GT6/TR6, beneath is one from a slant-mounted engine, a saloon. I've aligned the two plates so that the bolt holes to attach it to the engine are inline, the eight around the crank, and the four at the top. This shows very clearly that the bolt holes for the bell housing on slant and upright engine plates are NOT the same, because those in this pair do not align. Moreover, that the starter mounting holes are in different places. If you use a saloon engine in a Vitesse (or GT6) then you must use the original engine backplate, else your gear change lever will be a.t a very odd angle! John Edited June 2 by JohnD 1 Link to comment Share on other sites More sharing options...
gt6chris Posted June 2 Report Share Posted June 2 Hi John, OK I stand corrected. I must admit that I was going by part numbers and in several places the same backplate is listed for the tr6 and saloons. However I see that the vitesse and gt6 are listed with a different number. I have since carried out the same check as yourself with my collection of backplates with the same outcome. The vitesse backplate is not the same as the saloon one. Apologies for any confusion caused. Chris 1 Link to comment Share on other sites More sharing options...
JohnD Posted June 2 Report Share Posted June 2 Just looked at Canley's and Rimmers's and they list TR5/6 and 2000/2.5 saloon 211505 GT6/ Vitesse 211514 I can't understand how they can quote the same part for the TR and saloons! Has to be nonsense! John Link to comment Share on other sites More sharing options...
johny Posted June 2 Report Share Posted June 2 On 21/05/2024 at 23:05, Puglet1 said: So. Sat here thinking I would like a bit more power from my Vitesse. Everyone says the best route to get more power in a Mk2 Vitesse is to go 2.5. Question is…. Which 2.5 engine is required and how do I identify the engine by its number? My current engine is really sweet so can it be converted to 2.5 and if so how? Looking for approximately 150 BHP. Is this achievable and if so what additional ancillaries are required…eg carbs, exhaust etc? I see a few people on here saying they have this type of conversion but another question is…..how much did it cost? Any suggestions ? Thank you. Pete. Are you sure youre getting every horse out of your existing set up Pete? Link to comment Share on other sites More sharing options...
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