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Peter Cobbold

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Peter Cobbold last won the day on November 23 2018

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  • Location
    North Wales
  • Cars Owned:
    Wade-blown TR6
    TR7 fhc - not blown, yet....
    Science. Microscopy
    Creative conservation
    Birding, Iceland, UFO science.

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  1. Peter Cobbold


    My cure was new UJs, no extra balancing. Front UJ had dried out, and worn.
  2. TR5 looks, 6 pot, supercharged. But not IRS. Preferably parallet trailing arms and Panhard rod with solid axle, or a de Dion arrangement. I suppose a blown TR250 comes closest. Peter
  3. Yes, and no need to wait for the rpm to cllimb...drive the torque. I get 6 psi boost at 2800 rpm and approx 100 bhp at the flywheel, so hardly ever exceed 4000 rpm ( and ca 8psi). Peter
  4. "Super agers" are an active research area, eg: https://medicalxpress.com/news/2019-09-superagers-memory-brain-twenty-somethings.html Not sure I'd want to think like I was 20..... Peter
  5. VSCC :Loton Park H/c. Bit chilly in the Dee valley fog going out (must get the heater fan working...) but a lovely sunny day, Lots of interest in the blower. But not one ERA competing...times change. Parked naxt to a 36k mile Sunbeam Alpine, original everything. Peter
  6. Agree. Might even rejoin if Malvern is on. Peter
  7. Peter Cobbold


    Robin, Undue cam wear might not be due to low hardness if the oil lacks corrrect and sufficient anti-scuff additives eg ZDDP. Modern cat-friendly oils bear little resemblance to those we used in 1970s Peter
  8. There's lots of efi expertise on SIdeways with all types of Triumph engines. But like TimD I went for supercharging for torque, gobs of it at low rpm. Peter
  9. Dunno, I only have one SU to worry about !
  10. Its because of the firing order: 153624 Looking at each carb in turn we heve open inlet valves in sequence 2*1*** 3**4** 5*6*** The centre carb has evenly spaced pulses while the outer carbs the second pulse soon follows the first, followed by a gap. Fuel flow is a tad better with even pulses. Thats why the triple SU Jag engines had a slightly leaner needle on the centre carb. Mind you the effect is small. Triple or twin?. The "constant depression" is what matters, so I'd evaluate carbs starting with measuring that. With twin carbs the spring, which is there to improve atomisaiton, can be removed as the manifold runners are symmetrical. Then compare piston masses and areas. to get a measure of the CD............... Peter
  11. Hi Barry. Glad you're still here. I wonder if the previous owner used silicone and failed to mark the reservoir. If you still have the fluids in the bottle you photgraphed, take some of the clear upper layer and see if it mixes with water. If it doesnt its not glycol and is probably de-dyed dot 5. Brake system rubber may swell differently in glycol and dot5. and switching fluids may well shorten its life and reliability There was along thread a few years back when PaulAA dicovered his mechanic had topped up his dot5 with the "new version 5.1". He decided to replace all rubber components throughout. Peter
  12. Sills, wings....and the rest. They were rust buckets from new, which is why so few have survived. Look for one with a fully documented rebuild with serious rust-proofing. if you are skiied with welding and metal fabrication you might succeed but the 7 is monocoque and will not be an easy car to learn those skills on. Peter
  13. Marxo, He'll be busy, strippimg out all the rubber in the system, flushing the pipes with meths, then drying with compreesed air. and rebuilding. Peter.
  14. Marco, When you shake up dot 5 and 5.1 the huge surface area between the droplets allows the purple dye to migrate from the silicone to the glycol, which is where it prefers to be Technically it is called partitioning. https://www.quora.com/What-is-the-lipid-water-partition-coefficient-of-a-drug Dye partitioning leaves the dot5 clear Note that the dye deos not stain the silicone molecules, ther is no chemical attachment Partitong will happen slowly even without shaking uo the tow fluids. The dot 5 floats on the glycol as it is less dense,as in your table of SGs Water wont dissolve in silicone ( whis is why I use it) but is avidly absorbed by glycol, irreverisbly. The bubbles in the interface may be silcone droplets that have a contaminated surface preventing them from re-fusing with the bulk dot5. Traces of fat can do that, Peter
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