AndyW123blue Posted September 2, 2015 Share Posted September 2, 2015 HiI'm trying to identify my engine cc and which model it came from. It's registered as a 1998cc which potentially from looking round isn't correct. The car is a 1968 mk1 gt6 the engine number is cp25784HE I'm ordering overhaul parts soon and don't want to get the wrong ones.ThanksAndy Quote Link to comment Share on other sites More sharing options...
yorkshire_spam Posted September 2, 2015 Share Posted September 2, 2015 Tr5/tr6 pi? Quote Link to comment Share on other sites More sharing options...
AndyW123blue Posted September 2, 2015 Author Share Posted September 2, 2015 Is it a 2.5? Quote Link to comment Share on other sites More sharing options...
yorkshire_spam Posted September 2, 2015 Share Posted September 2, 2015 Yeah I think so. Quote Link to comment Share on other sites More sharing options...
WIMPUS Posted September 2, 2015 Share Posted September 2, 2015 Like Sam says above ! [Sorry, link no longer available]#TR2-6">[Sorry, link no longer available]#TR2-6 Quote Link to comment Share on other sites More sharing options...
thescrapman Posted September 2, 2015 Share Posted September 2, 2015 It could be a TR6 block with a 2000 crank fitted, but most likely it is a 2.5.Look for dents in the sump above the rack where the crank needs extra spaceCheersColin Quote Link to comment Share on other sites More sharing options...
AndyW123blue Posted September 2, 2015 Author Share Posted September 2, 2015 I'll have a look when I take the engine out, looking online the engine number looks to be between 68 and 69 the car was registered in 68. Is it likely that someone's changed it or could it of come from the factory with it in. Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted September 2, 2015 Share Posted September 2, 2015 No, it's been changed. GT6 would be KE prefix.Block at least is from a Mk1 PI saloon, TR5 or early-ish TR6. Could well be a 2.5 and even in a decent state of tune if in original trim to match the "CP" prefix.Could also be a 2L rebuilt with a donor block after dropped thrust washers or similar disaster though this is perhaps less likely.Nick Quote Link to comment Share on other sites More sharing options...
andy thompson Posted September 3, 2015 Share Posted September 3, 2015 February or March 1969 TR6 150hp engine - almost the same number as mine - IF original it's basically a TR5 engine - X drilled crank etc Quote Link to comment Share on other sites More sharing options...
Jonny-Jimbo Posted September 3, 2015 Share Posted September 3, 2015 I'll take a punt on it if you end up swapping the engine - could be a good one to go in my Mk1 2000 estate if it is a 2.5 engine. Quote Link to comment Share on other sites More sharing options...
AndyW123blue Posted September 3, 2015 Author Share Posted September 3, 2015 Ok thanks everyone, I'll keep you in mind if I change the engine. Can anyone just summarise what the difference is between the 2ltr and 2.5 (apart from the .5) is the block the same? Quote Link to comment Share on other sites More sharing options...
Jonny-Jimbo Posted September 3, 2015 Share Posted September 3, 2015 As a rule the block is the same, but the head and pistons changed, as well as the crank and cam, and it's age dependent too etc. It's all about as clear as mud until you get into the engine to see exactly what you have. If the pistons are domed it's a 2L, if they're flat it's a 2.5L... probably. Quote Link to comment Share on other sites More sharing options...
RobPearce Posted September 3, 2015 Share Posted September 3, 2015 If you've got the head off (so that you can see whether the pistons are domed) then you can tell the difference absolutely by measuring the stroke. Turn the crank until one pair of pistons are at BDC and measure how deep they are. Three inches (76mm) means it's a 2L while nearer four (95mm) is a 2.5 Quote Link to comment Share on other sites More sharing options...
AndyW123blue Posted September 3, 2015 Author Share Posted September 3, 2015 Thanks, this is my first triumph restoration. Must admit the engine is a bit of a mystery still. I'll strip it down then talk to canley or Rimmers to make sure I get the right parts. Does anyone know where I can get a triple weber manifold for this engine I want to fit dcoe 40s Quote Link to comment Share on other sites More sharing options...
Richard B Posted September 3, 2015 Share Posted September 3, 2015 Was it already fitted to the GT6? If so what induction system did it come with?Don't let that crank out of your sight. Make sure the oilways are thoroughly cleaned if you have it reground.Triple twin chokes 🤔 what that engine was designed for, was a set of triple throttle bodies and a Lucas PI metering unit 😎 Quote Link to comment Share on other sites More sharing options...
AndyW123blue Posted September 3, 2015 Author Share Posted September 3, 2015 Yes it was in the car I bought. It has two strombergs Quote Link to comment Share on other sites More sharing options...
AndyW123blue Posted September 3, 2015 Author Share Posted September 3, 2015 Twin strombergs I guess they'll be 150's Quote Link to comment Share on other sites More sharing options...
GT6 1 Posted September 4, 2015 Share Posted September 4, 2015 The correct engine prefix for yours should start KC, KE is Mk III. 🙂 Quote Link to comment Share on other sites More sharing options...
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