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About jp928

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  1. Robert Bosch Magneto identification - 1925

    If it needs full advance to start, sounds like the advance/retard mechanism has slipped somewhere- any sign of that occurring? Could be anywhere along the chain of linkages. jp 26 Rover 9
  2. Robert Bosch Magneto identification - 1925

    Can you expand on the 'might not be adjusted correctly' please? What is the symptom? With my 26 Rover, with everything refurbished (according to receipts from previous owner),but not started before, it would turn over well, but no sign of any action. I set the crank at Cyl 1 firing mark (flywheel), and opened the red lower cap on the magneto (Lucas 4Jx) - the points should have been starting to open, but they were 60-70 degrees away. I removed the maggy without disturbing the crank or maggy connection on the engine side (fortunately easy - external engagement). I loosened the drive flange , turned the shaft until the points just opened, refitted the drive flange and tightened, replaced maggy - it ran. If your issue is failure to run, open the red lower cap (single wire), check that the points do open to the correct gap, and that they are in good condition. Problem could also be condenser failure, which is a PITA as its internal, messy to replace. REmove 1 plug lead, hold 1/4" away from any handy ground of the engine, and see if it sparks when you crank the engine - if it does, condenser is usable, but timing may be out. There is a lot of info out there for the Bosch units - see . The serial no 279103 , from data on the above web page, appears to have been made in 1907-8 - does it look original on your Maxwell ? See also hth jp 26 Rover 9
  3. Vapor Lock

    I thought Octane referred to a fuel's ability to resist knock, or pre-ignition, hence the higher the compression, the higher the octane required. ?? jp 26 Rover 9
  4. And I would guess those are Imperial pints - 20 ounce, NOT 16 ounce US pints, just in case the OP is in US! Is there no dipstick to measure the level ? I would think thats the best measure. jp 26 Rover 9.
  5. Vapor Lock

    Vapor lock is almost always caused by relatively high pump sucking fuel upwards. As soon as the suck depression vaporizes the fuel there you are - some of the worst are English cars with SU pumps high on the firewall. Solutions - site the pump as low as possible , close to the tank; reduce fuel temp - paint the bottom of the tank silver or white, if exposed to the road to reduce heat uptake. Best solution as above is an electric pump down at the tank. jp 26 Rover 9, High tank, gravity feed. PS Did you know that gravity feed from a wing tank is enough to keep a jet engine running! Look up QF32 , 2010.
  6. Lagonda Rapiers

    Spanners used daily here Bernie. Some wrenches too. I knew about block stud thread countersinking from my father. keep up your posts please, we all learn something from them. I just noticed a Rover 9 engine and gearbox was sold on gumtree recently - will have to check more often. jp
  7. Lagonda Rapiers

    2 x 1.5 " SU is a ot of carb for a 1500 - very sporting. Last big carbed engine I had was Rover 2000 TC with 2 x 2" SUs. So why are the piston crowns offset ? thanks john
  8. Lagonda Rapiers

    Bernie, Asymmetric piston crown orientation is obvious - block changed for more capacity, but head casting not changed ? Block bore spacing changed, but not the head to match? How does coolant get from the block to the head ? One connection at the rear that is not visible in the pics? thanks john 26 Rover 9
  9. 1912 Humber

    Bernie, RE the Humber crankshaft - does it have oil drillings to feed the 2 and 3 big ends? Or is it splash lubed? Just curious. Thanks john
  10. NEW Fiat Abarth ?

    Dont forget the latest Fiat 124 Sport is a Mazda ND model MX5 under the skin - Fiat drive train and body skin, Mazda base and suspension. Seems to go every bit as well as well a the original, and looks very good. jp 26 Rover 9
  11. I have a cover called 'Laid Up' here in Oz for my 26 Rover - basically only covers a total loss caused by the house burning down or otherwise destroyed. A$60/pa covering A$9500, unfinished restoration. Have a kit car (Lotus 7 clone) covered for $23k for $290/pa, only to be used for 90 days/pa. Insurer is selective about what they cover - for ordinary stuff like Mazda3, their quotes are prohibitive. I think you need to look for a speciality firm, or go through a broker. jp 26 Rover 9
  12. 12Volt to 6 Volt Resistor for 1936 Ford Horns

    Some of the better horn sounds are produced by using two horns with different but complementary tones, a bit like playing chords on a piano. You would not normally notice this until one of them failed. I will see if I can any data on this. jp 26 Rover 9
  13. My "new" 1916 D45

    Looks terrific, well Done. One question - 'sominstrated' ? jp 26 Rover 9
  14. Decoding

    VINs were not standardized until 1981, before that each manufacturer used their own layout. Do a search on the web to see if the maker can/will decode a 63. jp 26 Rover 9
  15. LED tail light bulbs

    I am fitting LEDs to my Rover, but fortunately its a neg earth, which surprised me somewhat. I think your only option will be to isolate your light fittings completely from the chassis and run 2 wires everywhere. I was told my car was not an earth return system, but with the dynamo having only 1 wire (charge output) it can only be neg earth - and the dynamo charges fine. jp 26 Rover 9