Alex Posted October 14, 2006 Share Posted October 14, 2006 sorry difference being? Link to comment Share on other sites More sharing options...
Deleted User Posted October 14, 2006 Share Posted October 14, 2006 post removed on request of author Link to comment Share on other sites More sharing options...
Deleted User Posted October 14, 2006 Share Posted October 14, 2006 Hey Dave,Don't suppose you have any TR5 / Mk1 Pi cranks knocking about in your office? I was debating what they are made of with james Shackford on the RBRR.Just wondered what steel they are made of I know that the cooking 2000 and 2.5 cranks are EN16U but wondered if the TR5 was EN40Also isn't the early 2000 (2inch mains) made of EN40?cheersAndy Link to comment Share on other sites More sharing options...
Deleted User Posted October 14, 2006 Share Posted October 14, 2006 Hang on Andy I'll go and take a gander, I have one (kept back for something special) under one of the bench's in the engine shop. Link to comment Share on other sites More sharing options...
Deleted User Posted October 14, 2006 Share Posted October 14, 2006 Na, EN16. I have a stillage full of new early 2lt cranks somewhere to, I'll have a look at those later (when it's lighter), I doubt they are EN40 though? Link to comment Share on other sites More sharing options...
GT6DavidMK1 Posted October 14, 2006 Share Posted October 14, 2006 Hi,photo of TR6 crank that broke earlier this year Link to comment Share on other sites More sharing options...
GT6DavidMK1 Posted October 14, 2006 Share Posted October 14, 2006 photo.David Link to comment Share on other sites More sharing options...
Jason Posted October 14, 2006 Author Share Posted October 14, 2006 Nasty! Did it do any other damage or was that it? Link to comment Share on other sites More sharing options...
Deleted User Posted October 14, 2006 Share Posted October 14, 2006 I remember A Roberts saying the early 2000's were made of tougher steel... I wonder where the 2.5Pi steel crank myth began or are some made of EN40?james S was claiming his was nitrided... but you can only nitride EN40 ... EN16 is only good for tuftriding or am I talking rubbish? Link to comment Share on other sites More sharing options...
Jason Posted October 14, 2006 Author Share Posted October 14, 2006 I think you're talking sense Andy - chemically nitriding needs specific steel to be effective, EN40 has low carbon and a higher chrome molly contentent that makes it ideal for nitriding. The only thing special about early 2.5 cranks is that they were cross drilled to TR5 spec - nothing else (as far as I know) is special.Interestingly, having just looked it up, I didn't realise that Tufftride is a registered trade mark, in fact it's salt bath nitrocarburising and seems to be a much lower tech process and something of a one size fits all. I found this pdf useful http://www.chta.co.uk/downloads/data_4.pdf Link to comment Share on other sites More sharing options...
Jason Posted October 14, 2006 Author Share Posted October 14, 2006 For your delectation, there are a selection of photos of the strip down on my Blog - just to illustrate those rods, take a look at this Can anyone ID the cam for me? On the shaft it says 4 MC 24333 and on the end KC TH2.The block looks fine as do the pistons but all the top rings are broken - is this common or was it assembled badly? What do you think? Link to comment Share on other sites More sharing options...
Richard B Posted October 14, 2006 Share Posted October 14, 2006 I think thats a Kent Cams TH2, as in Terry Hurrell from Triumph Tune. Link to comment Share on other sites More sharing options...
Deleted User Posted October 14, 2006 Share Posted October 14, 2006 post removed on request of author Link to comment Share on other sites More sharing options...
Jason Posted October 14, 2006 Author Share Posted October 14, 2006 Yup - it does look like the only balance properly adjusted was the owners bank balance :-( Right, I'm off to bag and tag this engine and start the spare engine strip down Link to comment Share on other sites More sharing options...
GT6DavidMK1 Posted October 14, 2006 Share Posted October 14, 2006 Hi Jason,to your reply earlier, did no damage to the block just a had a knock on pick-up stripped the engine down, new 2.5 crank fitted with bearings and new piston rings fitted after honing the bores, rebuilt engine, runs very well and customer a happy chap.Had the crank nearly 10 years sitting in the stock room, knew it would come in handy one day ;D have a new 2ltr crank as well. Regards David. Link to comment Share on other sites More sharing options...
Brummie Dave Posted October 14, 2006 Share Posted October 14, 2006 Hi JasonSorry to see your crank in two halves. that engine did 3 Castle Combes, 2 days at Santa Pod and the RBRR with no trouble. You go to the shops in it and you break the crank whats going on mate? Link to comment Share on other sites More sharing options...
Jason Posted October 14, 2006 Author Share Posted October 14, 2006 [quote by=Dave link=Blah.pl?b=2000,m=1160677456,s=46 date=1160862489]Hi JasonSorry to see your crank in two halves. that engine did 3 Castle Combes, 2 days at Santa Pod and the RBRR with no trouble. You go to the shops in it and you break the crank whats going on mate?[/quote]Shit happens mate :-) There's no other evidence of any major maladies in there - the rods are a bit messy but they didn't break, the thrusts are a bit worn but they were in place fine, the top rings are broken but they don't figure in the failure so I guess it was just it's time. I do drive it hard but not that hard and atthe time of the failure I was cruising! Never mind - it will live again! Link to comment Share on other sites More sharing options...
Deleted User Posted October 15, 2006 Share Posted October 15, 2006 BTW 2.5 crank snappers , if you haven't seen this slightly heated thread on the Kastner Forum it's well worth a read. Gareth Thomas at his vitriolic best ;D ;Dhttp://p104.ezboard.com/fkaskastnersforumfrm2.showMessageRange?topicID=30.topic&start=1&stop=20Must get round to building that 2.3 litre Pi one day 8) You know it makes sense Link to comment Share on other sites More sharing options...
Brummie Dave Posted October 15, 2006 Share Posted October 15, 2006 JasonThere was nobody more surprised then me when I collected the crank and rods. Infact karl took them down to his dad to weigh them on some special scale.he had at work. They were fine, but i must agree they looked crap.Off today to look at a Vitesse HERE WE GO AGAIN! Link to comment Share on other sites More sharing options...
Jason Posted October 15, 2006 Author Share Posted October 15, 2006 Good luck Dave, you know it makes sense, go for the PI, you've had the experience with the TR - how did the house moving go?The Vitesse crank doesn't look like it's been touched for balancing at all - having said that the clutch cover and flywheel are marked for balance. Flywheel looks standard - I always thought it was lightened, felt like it but it's not in the spec you gave me so I assume now that it was just a balanced 2 litre one?Andy - Gareth certainly does speak his mind doesn't he, makes for interesting reading :-) Link to comment Share on other sites More sharing options...
Brummie Dave Posted October 15, 2006 Share Posted October 15, 2006 I surpose its the end resault that counts and it was smouth and fast. It's always put a smile on my face.House not sold yet thanks. Link to comment Share on other sites More sharing options...
Jason Posted October 15, 2006 Author Share Posted October 15, 2006 Indeed Dave, it did good, I'm not complaining mate, I had fun and I'm still having fun taking it all apart :-)Now for the stock take of spare bits - I found this in my spare 2.5 (MG prefix, recessed block, unknown heritage, came out of my original PI Vitesse projet) more pix on the blogWhat is it? It's cross drilled and doesn't seem to have been balanced (no grinder marks) but it's been in my garage for 15 years+ All the bearings are through the white meatl to the backing but it's even wear and there doesn't seem to be any scoring. Link to comment Share on other sites More sharing options...
Fuzzy Harris Posted October 15, 2006 Share Posted October 15, 2006 just a thought, does anyone know if police cars had anything done to there engines, my old 2.5 pi police car sitting in the garage was said to have allsorts done to it, but i`ve also been told that they were all standard, does anyone have a definative answer ? Link to comment Share on other sites More sharing options...
Deleted User Posted October 16, 2006 Share Posted October 16, 2006 Does the X drilled crank have a long or short back?Very early Tr6's and Mk2 Pi's had this type of crank and according to Gareth Thomas so did the police spec engines (the cooking 2.5PI reverted to the cheaper crank in 1970 or so) . BTW Cross drilling is the only way to go for high revving 2.5 engines. Link to comment Share on other sites More sharing options...
Jason Posted October 16, 2006 Author Share Posted October 16, 2006 It's the same back as the one that came out of the Vitesse - short back. Also of interest is that it's a recessed block but flat pistons, I thought recessed block = domed pistons. Also, each piston is numbered, on the crown the number is stamped on 1-6, never seen that before. Link to comment Share on other sites More sharing options...
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