Greeks Posted October 10, 2006 Share Posted October 10, 2006 I chanced across a car badged as a 2500 S w/ auto box in a wrecker's yard last weekend. It wasn't in the greatest of conditions, and has been sitting there since 1997 by the looks of it, one Stromberg remaining.Anyway the diff appeared to be moving properly, etc. which made me think it could be worth having as a spare diff.The engine was stamped CR .... which I believe means it's a TR5/6 or possibly 2.5Pi unit. I didn't check the head stamp to see what head it's got on to give me a better idea ... but then that might not be the correct head anyway. Is there any way of figuring out what it's got inside by looking at it from the outside? (i.e. if it's TR6 how can I tell if it's the more powerful one?)It's marked as having a blown head gasket - should I leave it alone? Link to comment Share on other sites More sharing options...
spitty71 Posted October 10, 2006 Share Posted October 10, 2006 CR is late TR6 so it's the 125bhp engine - thats when fitted with PI obviously. Steve Link to comment Share on other sites More sharing options...
Greeks Posted October 10, 2006 Author Share Posted October 10, 2006 Phew ... as nice as it would have been to get hold of a good TR5/6 unit it would have taken some explaining, and may have resulted in the following exhchanges:Me: "But darling we NEED two spare Triumph engines"Mrs: "In that case you can sleep in the shed with the f$@#kers!"Father-in-law: "That could be useful for our 10CR project car*..."Mother-in-law: "In that case you can sleep in the shed with the f$@#ker!" ;D*doesn't exist yet Link to comment Share on other sites More sharing options...
Spitfire2500 Posted October 11, 2006 Share Posted October 11, 2006 CR was also fitted to Mk I 2500 saloon and estate. Better engine (132bhp) than the TR6 version. Link to comment Share on other sites More sharing options...
spitty71 Posted October 11, 2006 Share Posted October 11, 2006 Thats a good point, could also be from a mk1 pi as Bill says. You'd be better off fitting a TR5 cam to your 2.5s engine as that has the best standard cylinder head :) Link to comment Share on other sites More sharing options...
Deleted User Posted October 13, 2006 Share Posted October 13, 2006 almost certainly a Mk1 Pi engine... read crossdrilled steel crank with lighter flywheel well worth a punt ;) Link to comment Share on other sites More sharing options...
Greeks Posted October 13, 2006 Author Share Posted October 13, 2006 Oh, if only i'd gone to that breakers yard first Andy, then i'd have that engine instead of the TC one ... and the yards are literally 100m from each other :-(We're moving to Tassie in a month's time and I've only just got the TC out of the in-laws shed ... I don't think I'd be popular if I bought another with a blown head gasket and then moved!BUGGER Link to comment Share on other sites More sharing options...
Deleted User Posted October 29, 2006 Share Posted October 29, 2006 hey, no way! The early cross drilled cranks are NOT made of steel. No Triumph had a steel crank, only BMC cooper S and Midget 1275 had that. Even Jags never had steel cranks until 1990.....CR TR6 engine is identical to late 2.5 pi saloon, with that horrible late boring cam, so big deal!GT Link to comment Share on other sites More sharing options...
valencia1 Posted October 30, 2006 Share Posted October 30, 2006 how can it be "boring", it does the job it was intended to do, all made to a cost, like all other parts, you start getting specialised its puts up the priced of the finished product. it was built for the joe public to use on the public highway, not on a race track.regards, bryan Link to comment Share on other sites More sharing options...
Deleted User Posted October 30, 2006 Share Posted October 30, 2006 I apologise ...Mk1 PI cranks are not steel but EN16U monkey metal.However the cross drilling helps lube of the big ends and even better the standard flywheel is much lighter... good when the crank weighs 28kg ;) Link to comment Share on other sites More sharing options...
Greeks Posted October 30, 2006 Author Share Posted October 30, 2006 Cheers - worth knowing.Presumably they stopped x-drilling the cranks? Why? Link to comment Share on other sites More sharing options...
Deleted User Posted October 30, 2006 Share Posted October 30, 2006 Usual reason.... cost benefit analysis... it was originally done presumably because someone in engineering was worried about their longevity so over engineered it for production.... then they realised that 2.5 cranks (generally) go on for ever in a road car and crossdrilling wasted a few quid.Dolly Sprint crank suffered the same fate... first few thousand(?) were crossdrilled which was later deleted by an accountant trying to make the company some money... he ultimately failed I guessBy the way CR engines are the anomaly of the Triumph range as they mark both Mk1 Pi engines (which are effectively a TR5 engine with a Mk2 GT6 cam) and the later TR6 PI engine with the horrid 18-58 cam that gareth is referring to. They can be differentiated by the fact the early CR engine has no stiffening rib along the crankcase on the manifold side and the crankshaft is longer at the back on the Mk1 Link to comment Share on other sites More sharing options...
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