beefertoo Posted December 15, 2010 Share Posted December 15, 2010 hi all, i'm looking at changing my spit to 2.5 over the winter and as such already have a crank.question is what benifit will i get from an early tr6 cam? (the engines currently a standard gt6)according to the ebay seller the cams marked up 307621.thanks craigp.s i'm thinking also to fit 1 3/4 carbs and a pi dizzy when i can find one, or poss megasquirt if funds allow.any thoughts welcome Link to comment Share on other sites More sharing options...
Nick Jones Posted December 15, 2010 Share Posted December 15, 2010 The std Vitesse/GT6 mk2 / Early PI cam is a good compromise and will work well with carbs. TR5/Early TR6 will give more grunt at the expense of temperment on carbs. Would expect it to give excellent results with MS. Depends what you want really. Either will bust gearboxes and diffs without breaking into a sweat.Speaking from experience, over-camming a road car should be avoided - mostly it justs annoys.Nick Link to comment Share on other sites More sharing options...
beefertoo Posted December 15, 2010 Author Share Posted December 15, 2010 hmm probably not such a good idea then. tbh i would rather trade absolute power for a non tempremental engine. plus its a bit more in the kitty for m/s..craigp.s mines a gt6 mk 3 is this as good as the mk 2? Link to comment Share on other sites More sharing options...
James Posted December 15, 2010 Share Posted December 15, 2010 Craig,If you are planning on going MegaSquirt then I would go for the wilder cam. The EFI really tunes out any "issues" and will make it in to a beast of an engine. I have a wilder cam in my 2 litre and on EFI it's really not an issue at all on the road - and that's in a much heavier big saloon which would highlight a weaker engine.James Link to comment Share on other sites More sharing options...
Nick Moore Posted December 17, 2010 Share Posted December 17, 2010 Tim Ward's 2.5L Mk3 GT6 has a TR5 camshaft and 1.75" carbs. I drove it around the carpark at Prescott, and rode shotgun up the hill with Tim, and it felt perfectly civilised. Smooth idle, gobs of torque at low speed and quite good top end as well. I'll either fit one of these or a GT variant in my Mk3 when engine-building time arrives. Link to comment Share on other sites More sharing options...
Tim Bancroft Posted December 18, 2010 Share Posted December 18, 2010 I still think 2000cc sixes are the right engine for GT6s and Spitfires...... Link to comment Share on other sites More sharing options...
TimW Posted December 18, 2010 Share Posted December 18, 2010 Nick_Moore wrote:Tim Ward's 2.5L Mk3 GT6 has a TR5 camshaft and 1.75" carbs. I drove it around the carpark at Prescott, and rode shotgun up the hill with Tim, and it felt perfectly civilised. Smooth idle, gobs of torque at low speed and quite good top end as well. I'll either fit one of these or a GT variant in my Mk3 when engine-building time arrives.Thanks Nick ;) Link to comment Share on other sites More sharing options...
TimW Posted December 18, 2010 Share Posted December 18, 2010 timbancroft61 wrote:I still think 2000cc sixes are the right engine for GT6s and Spitfires...... Why Tim? :) Link to comment Share on other sites More sharing options...
Richard B Posted December 19, 2010 Share Posted December 19, 2010 Some people like a revvy 2 litre, other people get seduced by the torque of a 2.5 :Bps stay away from the 307621 thats a detuned 2000 saloon style cam fitted to the American TR250; the GT6 MkII / 132bhp Saloon PI cam is better. The TR5/TR6 cam is a differant animal and not a 307621. :) Link to comment Share on other sites More sharing options...
James Posted December 19, 2010 Share Posted December 19, 2010 A revvy 2 litre is far more suited to a sportscar than a lazy 2.5I prefer that but then I expect to drive a sportscar like a sportscar.(and errrr a big saloon like a sportscar too :) ) Link to comment Share on other sites More sharing options...
Richard B Posted December 19, 2010 Share Posted December 19, 2010 jcarruthers wrote: than a lazy 2.5I prefer the term effortless... ;) Link to comment Share on other sites More sharing options...
TimW Posted December 19, 2010 Share Posted December 19, 2010 jcarruthers wrote:A revvy 2 litre is far more suited to a sportscar than a lazy 2.5I prefer that but then I expect to drive a sportscar like a sportscar.(and errrr a big saloon like a sportscar too :) )Sorry james but mine just isn't lazy! at least i don't think so :-/ Link to comment Share on other sites More sharing options...
drofgum Posted December 19, 2010 Share Posted December 19, 2010 Ah, but is it revvy? ;D This will always be a matter of taste of course. Cheers, Paul Link to comment Share on other sites More sharing options...
Steve P Posted December 19, 2010 Share Posted December 19, 2010 Well someone on here bought the one on e-bay,the websites i looked at stated that 307621 was for TR250 and early TR6,also 2.5 TC and S.No one said it was a TR5 cam.Steve Link to comment Share on other sites More sharing options...
TimW Posted December 19, 2010 Share Posted December 19, 2010 1317 wrote:Ah, but is it revvy? ;D This will always be a matter of taste of course. Cheers, PaulWhat do you call revvy Paul? Link to comment Share on other sites More sharing options...
Royboy66 Posted December 19, 2010 Share Posted December 19, 2010 339 wrote:Sorry james but mine just isn't lazy! at least i don't think so :-/Err, Nope! :X Link to comment Share on other sites More sharing options...
GT6 M Posted December 19, 2010 Share Posted December 19, 2010 ;D ;D ;Dohhh that was a blow below the belt, Link to comment Share on other sites More sharing options...
drofgum Posted December 20, 2010 Share Posted December 20, 2010 Tim,I think a small crank 1296 is revvy vs say, a 1500. Cheers, Paul Link to comment Share on other sites More sharing options...
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