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Post by Deleted on Sept 2, 2018 17:04:13 GMT
After discovering mouse Perky powered Elysian 27 has the legs on the BMC 1500 powered E27 plans have been hatched to close the performance gap by fitting a little KP35 Turbo. Currently we top out at 2000 RPM and 7.5MPH in 16' of water. Vanguard is nearer 9 MPH on the same stretch of river. I've set a self imposed ceiling of 2600 RPM, this is the sort of speed a BMC engined Broads cruiser with hydraulic drive will run to. I've a fairly hefty job list to work from, I'll post that up tomorrow when I get back to work. This weekend I did a bit of rework on the engine cooling system. The exhaust manifold was piped up so that the raw water from the heat exchanger cooled it, the outlet from the manifold was then connected to the exhaust water injection elbow. This gave a nice cool manifold but wasn't going to be suitable for the Turbo as it would rob too much energy from the exhaust gases meaning the turbo was unlikely to spool up at the sort of RPM I am looking at. So what to do? Easy - plumb the manifold in to the calorifier take off, this is all in 15mm copper so it was a case of removing the existing raw water pipework, fitting a modified flange to the manifold so I could connect a 15mm pipe to a 1/2"BSP - 15MM compression fittings. I then set about splicing in a tee to the outlet on the rear of the head, fit a gate valve to control the flow to the manifold - no good all the coolant taking the easy route back to the heat exchanger and losing performance of the calorifier. Tee into the 15mm return in the heat exchanger and join the two with a piece of radiator hose to allow for vibration. The raw water outlet from the heat exchanger was then piped straight to the water injection elbow. This will need revisiting when I install the intercooler. At the moment the aim is to keep the boat useable until the middle of October, we still have a few weekends planned so I can't go balls out and rip it to bits until then. Pics to follow (as normal!)
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Post by naughtyfox on Sept 2, 2018 17:33:21 GMT
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Post by Deleted on Sept 2, 2018 17:49:07 GMT
What are you going to do about turbocharger lubrication ?
Its an interesting idea but is the engine overengineered enough to deal with the extra power?
Is it worth considering boring it out?
I'm getting some idea of your psychology now you mention you are in competition with your old man.
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Post by Deleted on Sept 2, 2018 18:19:46 GMT
What are you going to do about turbocharger lubrication ? Its an interesting idea but is the engine overengineered enough to deal with the extra power? Is it worth considering boring it out? I'm getting some idea of your psychology now you mention you are in competition with your old man. Oil feed will come from the oil pressure sensor drilling in the block. I have an obscenely expensive oil pressure regulator that will maintain a max of 40psi to the turbo, it's a plain bearing in the turbo so should stand high oil pressure (we get 80psi cold, hot 60 psi @ normal running speeds) but it's kinder to the seal and will help prevent oil getting by into the compressor. This regulator also has a port to take the gauge so we keep an indication all is well on the dash. Oil lines will be made by my mate that does our hydraulic hoses are work. Drain from the pressure regulator goes into the tappet cover. Drain from the Turbo oil feed goes into the sump via the unused oil drain pump tapping (3/8 BSP so easy to get a hose tail on.) That's a brief overview of the lubrication side of things. As for the motor, the 1500 petrol could get to about 80bhp at around 5.5k on the same architecture. I'm looking at half the RPM under load. I'm not worried about the engines ability to stand it. The BMC is actually a very clever bit of design, I'll post a link to show why at some point. An A series 1275 will produce around 95hp with 10psi boost - limited by the gearbox rather than the engine. Engine work is not an option, it will yield little and is not needed, it's 1000 hours since a major rebuild and is in rude health! We are on 1:1 Borg Warner box with no room for a reduction box - academic anyway as there is very limited room for a bigger prop anyway.
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Post by Deleted on Sept 2, 2018 18:23:24 GMT
Not a hope! mouse has a little bit of knowledge in this field, having been at the forefront in the early days of increasing the performance of such cars as XR3's Golf GTI, Rover SD1 3500 and even a bloody Triumph Acclaim! Half handy design consultant to bounce ideas off. He also had a bit to do with GM/Detroit Diesels so I'm not worried about overlooking anything.
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Post by Deleted on Sept 2, 2018 18:26:22 GMT
Did you send me that flared seat fitting ? I'm back in englandland now. I hope it didn't get returned to sender
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Post by Deleted on Sept 2, 2018 18:29:06 GMT
Ah. Using the old man for technical advice. That's different to competing. I never had that luxury Anyway good luck with the project
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Post by Deleted on Sept 2, 2018 18:36:23 GMT
Did you send me that flared seat fitting ? I'm back in englandland now. I hope it didn't get returned to sender Not yet, I'll do it tomorrow. Last week was mental - the Dwarfs is no longer an inmate at pre school, I'd forgotten all the farting about I had to do after work! Free afternoon tomorrow so I'll get it in a jiffy bag and sent asap 🍻🚢👍🔨
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Post by Deleted on Sept 2, 2018 18:45:25 GMT
Ah. Using the old man for technical advice. That's different to competing. I never had that luxury Anyway good luck with the project I must admit, his Perky once I got it set up correctly does show the difference between the two, say it quietly but the Perkins 4108 is a lovely engine, none of the leaky liner issues it's older 4107 brethren suffers and quite powerful for its lack of sophisticated design by today's standards - the 4108 also having roots in the late 40's. It's a way better engine than the harsh BMC 1800, as is the sweeter 1500, turbocharging seemed the most obvious route and an interesting exercise as a bonus.
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Post by Deleted on Sept 2, 2018 19:15:49 GMT
Did you send me that flared seat fitting ? I'm back in englandland now. I hope it didn't get returned to sender Not yet, I'll do it tomorrow. Last week was mental - the Dwarfs is no longer an inmate at pre school, I'd forgotten all the farting about I had to do after work! Free afternoon tomorrow so I'll get it in a jiffy bag and sent asap 🍻🚢👍🔨 I just wanted to remind you in case you needed to go to the post office just to make sure everyone there was OK.
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Post by mouse on Sept 2, 2018 19:38:40 GMT
To quote Magnetman "Ah. Using the old man for technical advice". Having spent nearly 30 years in Further Education, Mouse has a good line in Talk if not Action!
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Post by Deleted on Sept 2, 2018 19:52:39 GMT
To quote Magnetman "Ah. Using the old man for technical advice". Having spent nearly 30 years in Further Education, Mouse has a good line in Talk if not Action! But don't forget:- No point in having a dog and bark yourself. Take your pick if thats me on the spanners or you behind the scenes
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Post by Deleted on Sept 2, 2018 19:59:42 GMT
Are the props the same?
Surely if you set your rev limit at 2k you will need to change the prop to make the boat go faster and then find the power to reach those revs.
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Post by Deleted on Sept 2, 2018 20:07:05 GMT
Are the props the same? Surely if you set your rev limit at 2k you will need to change the prop to make the boat go faster and then find the power to reach those revs. Plenty in hand on the prop, before the rebuild it used to wheeze to 1600 RPM! 2000 RPM is better but not quite enough. I'm after an uplift of 600 RPM, it's not the prop that's the problem, it's the lack of torque and shaft HP. With regards prop size, they won't be a million miles apart. The perky is also on a 1:1 box, in this case TMP box (which is not a patch on the Yankee box!) As I said before, the limit to what it can swing is the clearance governed by the p bracket. Stern gear is basically the same on both boats.
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Post by Deleted on Sept 2, 2018 20:36:18 GMT
it's not the prop that's the problem, it's the lack of torque and shaft HP. . Stick a massive brushless DC motor in there and some lithium batteries a la Tesla model 3 and hope for the best with the charging infrastructure. The acceleration will be amazing.
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