AMMO Posted February 26, 2006 Share Posted February 26, 2006 Danny LT's Duratec at Emerald yesterday. 297.5 bhp at 8140 rpm with 213 ft lb of torque. Never less than 190 ft lb of torque between 5,000 and 8,000 rpm. Although we were at the dyno at 9.30 we were not able to do any power runs until 1 pm. Traction problems, tyres, lowered floor hitting the deck, rear towing eye touching the rollers. Bleedin' nightmare. Had to leave at 5pm with different exhaust, bellmouths and cam timing still to experiment with. Couple of mods I still want to do. Dave Walker is confident we will see 300 bhp + next time. Might even make a few more horses once the engine has run a bit more. Thanks to Danny for giving me the opportunity to build this engine for him and being so very patient during it's very difficult and prolonged birth. Thanks to Mike Riley for pulling out all the stops and producing one of the nicest exhausts I have ever seen on a Seven. The man is a genius. Built exactly as I asked and even though the headers ar 2" diameter he managed the get the lengths exactly right and have them all exit out of the original hole without enlarging it. Hoping we can do a couple more mods and go back to the dyno soon. AMMO Link to comment Share on other sites More sharing options...
Gambo Posted February 26, 2006 Share Posted February 26, 2006 Nice one RED 2.0 HPC now on throttle bodies Link to comment Share on other sites More sharing options...
F355GTS Posted February 26, 2006 Share Posted February 26, 2006 Well done Ammo Mark Link to comment Share on other sites More sharing options...
rgrigsby Posted February 26, 2006 Share Posted February 26, 2006 Ammo is this an entirely new engine or a re work of Danny's old one? either way congratulations, it's great to see a Duratec making these kind of figures. Any chance of some rough spec details, ie cams, number of injectors? I guess it had a steel crank judging from the revs. Rob G www.SpeedySeven.com Edited by - rgrigsby on 26 Feb 2006 13:52:06 Edited by - rgrigsby on 26 Feb 2006 13:53:35 Link to comment Share on other sites More sharing options...
AMMO Posted February 26, 2006 Author Share Posted February 26, 2006 Robert It is Danny's old engine bored to 91mm for a capacity of 2,445 cc. Would have liked to go to 92mm for a capacity of 2,499 cc but decided to buy off the shelf items. In retrospect I would have preferred to do my own thing as the ring pack fitted to the pistons was not to my liking. 92 mm pistons are on the cards. Steel crank with 8 balance weights. Due to the design it weighs the same as the stock crank with 4 balance weights. Arrow rods. Head is ported with 36 mm inlets and 31 mm exhausts. More development to the head is still required but that will come when I have time to experiment on the flowbench with a dead head that I have at work. Might squeeze even bigger valves in at some point. The inlet cam is to my own spec to take advantage of the extra flow at higher lift as nothing I liked was available. Don't think I want to put anymore cam in the engine as I am happy with the rpm. More cam would probably mean higher revs. Cosworth's 300 bhp Duratec revs to 8,600. I think this is a bit much hence the decision to go for more capacity rather than higher revs. Managed to swing the cams once and gained 5.5 bhp. Wanted to mess around a bit more but was time to go home. Still on single valve springs but they seem to be working fine. Fabricated inlet manifold with 52 mm throttle bodies. 8 injectors. 4-2-1 exhaust with 2" headers and 3" bore silencer. We had a 2.75" outlet with tapered core to try. We have the possibility to rotate the collector to link 1 and 2 / 3 and 4 together to see what happens. Also had different length bellmouths but again no time. Managed to foul the grade 8 plugs and stupidly didn't take any spares. Bought some grade 6 from local shop and ran these, so maybe something to come from the plugs as well. We are at the very beginning of the development of this engine. Would like to see around 310 / 320 bhp eventually. Wished we had more time. Shame that we didn't go over 300 bhp but that will come. All the work was done in a bit of a hurry (although Danny may not agree with this). With the luxury of more time and a bit of experimentation we will eventually get there. If it was easy ift would probably be less fun! AMMO Edited by - AMMO on 26 Feb 2006 15:11:03 Link to comment Share on other sites More sharing options...
Jason Plato Posted February 26, 2006 Share Posted February 26, 2006 Great result Ammo -if this engine was @ 121bhp/l there should be scope to break 320 bhp @ 130 bhp/l if the 2.5l can rev a bit more ?? Dave here is C7 TOP Powered by Special K, Tweeked by this lunatic here South Wales AO Link to comment Share on other sites More sharing options...
AMMO Posted February 26, 2006 Author Share Posted February 26, 2006 Dave I think there is probably a bit more to come from swinging the cams and in the induction and exhaust. The rev bit I don't like that much. Currently we are at 25.5 mt. sec. mean piston speed at 8,140 rpm. 8,300 is 26 mt. sec. which is about as far as I'm happy to go. Cosworth rev their 300 bhp Duratec 2.3 to 8,600 which is almost 27 mt. sec. Maybe OK for a race engine but this is a road car with lots of track use. We need to find a few more ft lb of torque at high rpm. A 2 % capacity increase to a full 2.5 litre isn't going to hurt, better designed pistons with a nicer ring pack won't harm either. There are a couple of other things I want to try but they will have to wait until the engine gets a freshen up next winter. In the mean time I would like to get it back on the rolling road once it has done a few miles. I'm fidgety now wanting to do more testing. Danny on the other hand probably wants to drive it a bit! 😬 AMMO Link to comment Share on other sites More sharing options...
Dobuy Posted February 26, 2006 Share Posted February 26, 2006 Well done AMMO, keep up the good work, in a few months you will be talking about building engines for a conservative 300bhp Duratec SV, built in Dubai Link to comment Share on other sites More sharing options...
Nifty Posted February 26, 2006 Share Posted February 26, 2006 In the mean time I would like to get it back on the rolling road once it has done a few miles. I'm fidgety now wanting to do more testing. Danny on the other hand probably wants to drive it a bit!Car has now been delivered Ammo and I can confirm that Danny was fairly excited when I handed over the dyno sheets. I was sorely tempted to take it for a blast this morning *tongue* *tongue* Keep off the straight and narrow 😬 Link to comment Share on other sites More sharing options...
AMMO Posted February 26, 2006 Author Share Posted February 26, 2006 Thanks Neil Nifty Thanks for helping out with trailering the car back to yours and storing it overnight for Danny to collect today. Much appreciated. The car must be pretty mental to drive! I'm looking forward to putting my car back on the road next Wednesday. Must do something about the puny 228 bhp. Maybe next winter. AMMO Link to comment Share on other sites More sharing options...
dannylt Posted February 26, 2006 Share Posted February 26, 2006 All four tyres are bald from the rolling road excitement, so will have to wait till next weekend and new tyres before having a go! I can at least refine the cold start map until then 😬. The exhaust is a work of art, but most of Ammo's work is invisible on the outside - he must have done something though! Thanks Nifty for looking after it, I was gutted I couldn't watch this time. Link to comment Share on other sites More sharing options...
rgrigsby Posted February 26, 2006 Share Posted February 26, 2006 Sounds great Ammo, a fair amount of work but the end result is worth it. Danny I bet you can't wait to drive it, you're next track day should be interesting. I't'll be interesting to see how different it feels out on track. Rob G www.SpeedySeven.com Link to comment Share on other sites More sharing options...
Paul Gibb Posted February 26, 2006 Share Posted February 26, 2006 *thumbup*Ammo & dannylt L7 FUN Link to comment Share on other sites More sharing options...
Nifty Posted February 26, 2006 Share Posted February 26, 2006 My pleasure Danny (& Ammo) *thumbup* Keep off the straight and narrow 😬 Link to comment Share on other sites More sharing options...
Stuart Faulds Posted February 26, 2006 Share Posted February 26, 2006 Link to comment Share on other sites More sharing options...
h_____ Posted February 27, 2006 Share Posted February 27, 2006 Wow - thats pretty impressive figures! Link to comment Share on other sites More sharing options...
dannylt Posted February 27, 2006 Share Posted February 27, 2006 I'm hoping it will feel significantly more powerful otherwise it will have been rather a waste of money! 20% increase should be noticeable and now has the same power to weight ratio as my bike (500bhp/ton, *including* driver). Link to comment Share on other sites More sharing options...
Dobuy Posted February 27, 2006 Share Posted February 27, 2006 Danny, I hope you have a gearbox that's up to the job Duratec SV, built in Dubai Link to comment Share on other sites More sharing options...
rgrigsby Posted February 27, 2006 Share Posted February 27, 2006 I think he's got a Quaife straight cut dog box but I could be wrong, I guess that should be OK. It's torque that kills them after all so in theory even my BGH Type 9 should be just about OK at that level 😳 Rob G www.SpeedySeven.com Link to comment Share on other sites More sharing options...
dannylt Posted February 27, 2006 Share Posted February 27, 2006 It's a straight cut Quaife dog box, and I spoke to SP Components who built it; he reckoned it should be fine. The previous clutch plate wasn't though, so there's a heavier duty one now, and after being forced to learn to drive without the clutch for a day at Spa I reckon I'll use it a lot less this year! Link to comment Share on other sites More sharing options...
Simon_Rogers Posted February 27, 2006 Share Posted February 27, 2006 Very impressive what were the power figures measued at the wheels 🤔 Spanner Link to comment Share on other sites More sharing options...
AMMO Posted February 27, 2006 Author Share Posted February 27, 2006 Spanner I think we saw over 230 bhp at the wheels (wasn't paying too much attention to this). That would make the transmission loss around 22% which is about right. AMMO Link to comment Share on other sites More sharing options...
moosetestbestanden Posted February 27, 2006 Share Posted February 27, 2006 500 bhp/tonne with. Yowee. Congratulations! Maybe next winter. Me too, I hope. I still think I'm going to stay at 2L and build a high revving screamer. There's just something alluring about a 9000 rpm target. It'd sound awesome no doubt. ------- Chris E Blatibus Unum Link to comment Share on other sites More sharing options...
I.Mupferit Posted February 27, 2006 Share Posted February 27, 2006 AMMO, what did you have to go and do that for 🤔 I was happy with 240 before all this talk of upgrades and 300+ from a starting point of a 2.3 Duratec but no, you couldn't leave well alone could you. Well I hope you're happy now that I will be forced to feed this evil god of upgrades despite thinking I had successfully managed to put all that behind me ❗ Seriously though, an excellent result Brent 2.3 DURATEC SV Reassuringly Expensive R 417.39 😬 Link to comment Share on other sites More sharing options...
dannylt Posted February 27, 2006 Share Posted February 27, 2006 moosetestbestanden, I know Ammo is very keen to build a 9000+ RPM 2.0 or 2.2 (bored) screamer. He tried to persuade me to downgrade from my truck-like long-stroke 2.3 but I like my torque :-) Edited by - dannylt on 27 Feb 2006 16:45:03 Link to comment Share on other sites More sharing options...
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