v8 starting at 24v
- Thread starter koogie
- Start date
If your car is a manual, then a tow start is the answer. More likely an auto though, in which case that isn't possible.
I wouldn't want to risk the starter motor at 24v. Much better parallel up as many batteries as possible for a nice long churn. Start by spinning the engine with the plugs out. That will get the oil nicely circulated and you should be able to verify that you have oil pressure. (if not you'll need to prime the oil pump - try using the search function for this or ask again) The plug-less run should also allow you to verify you have petrol to the carbs if you have a mechanical pump and also to test one of the plugs held against the engine to verify you have sparks. Then you will have all services in place by the time you come to try a churn for real with the plugs in.
One other thought. How old is the fuel you are pulling through? Unleaded doesn't like sitting around and is a regular cause of non starting in previously laid up cars. Anything over a year without a start is an almost dead cert.
Chris
I wouldn't want to risk the starter motor at 24v. Much better parallel up as many batteries as possible for a nice long churn. Start by spinning the engine with the plugs out. That will get the oil nicely circulated and you should be able to verify that you have oil pressure. (if not you'll need to prime the oil pump - try using the search function for this or ask again) The plug-less run should also allow you to verify you have petrol to the carbs if you have a mechanical pump and also to test one of the plugs held against the engine to verify you have sparks. Then you will have all services in place by the time you come to try a churn for real with the plugs in.
One other thought. How old is the fuel you are pulling through? Unleaded doesn't like sitting around and is a regular cause of non starting in previously laid up cars. Anything over a year without a start is an almost dead cert.
Chris
I've done quite a few 12v conversions on 6v cars and trucks and standard practice with those is to run the 6v motor on 12v and I've not seen any ill effects. Short bursts of 24v through the 12v starter shouldn't cause any problems but just remember to disconnect the alternator before you do it. That said if you need to do that then there are problems that need to be addressed and you're just papering over the cracks.
I tried to start an old beagle van once with a jump from a F88 Volvo (24V)
The mechanic who had the F88 held the jump leads and said, "When I shout, hit the starter," as he touched the leads onto the battery terminals of the Beagle.
The battery exploded all over him :shock:
We had to hose him down
It was a lot funnier than it sounds
Richard
The mechanic who had the F88 held the jump leads and said, "When I shout, hit the starter," as he touched the leads onto the battery terminals of the Beagle.
The battery exploded all over him :shock:
We had to hose him down
It was a lot funnier than it sounds
Richard
koogie
Member
Theres a good spark with decent fuel in tank, the timing isn't great but at TDC the rotor arm pointing at no1, fuel is pumping ok to the union between the filter & carb fuel bowl at least though not sure if its getting to the carbs & plugs seem dry, i'm beginning to wonder whether its fuel starvation?
JVY
Active Member
I would guess, like Harvey says, you might get away with it. Putting two 12V batteries in series will give you double the internal battery resistance which should effectively limit the current through the starter motor a bit and help to prevent damage. However, you will still be putting significantly more current through the starter than with 12V, so I would avoid long bursts on the starter (to reduce risk of burning out starter and exploding batteries). If it was me, I would play safe and try Chris's 12V batteries in parallel suggestion first.
Guess the other thing to watch out for if the engine is still in the car is all your 12V electrics like bulbs, radio, wiper/heater motor etc. I would make sure it is all switched off (maybe pull the fuses just to be sure?).
Guess the other thing to watch out for if the engine is still in the car is all your 12V electrics like bulbs, radio, wiper/heater motor etc. I would make sure it is all switched off (maybe pull the fuses just to be sure?).
EasyStart is the Elixir Of Death, steer well clear of it. I couldn't possibly recommend getting one of those plastic containers with hand spray pumps that all sorts of cleaners seem to come in these days, cleaning it out, putting some petrol in, and then squirting the atomised fuel down the carbs. I couldn't possibly know that the petrol will melt the pump pretty quickly but you will have more than enough opportunity to either start the engine, rule out fuel as the problem, or even set the car on fire. Doing things like that is absolutely stupid, and reckless beyond belief.
ghce
Well-Known Member
As was suggested a plugs out churn, this should hopefully remove built up condensation in the heads, clean spark plugs for the same reason when you do the for real start. Two batteries in parallel.make a big difference to starter motor RPM if the origional battery is a bit old and hopefully will give a bettew spark at the plugs as the battery volts wont sag as much.
Graeme
Graeme
ghce
Well-Known Member
quattro said:
I have managed to set the odd engine alight after rebuilds in the past with the 1/4 cup of gas down the carbs trick :roll: Never been wise enough to think of having an extinguisher to hand at the time, caught up in the moment and excitment of that first initial start after a rebuild
Graeme
JVY
Active Member
quattro said:
Sorry, I know it's not really funny and hope your brother was OK. Can't help but wonder - what did you spray first with the extinguisher? Your brother or the car?I have used small amounts of pertrol poured into down-draught carb's in the past without problems. The engine doesn't run long but at least (if it fires) you know your ignition and timing is bascially OK. I guess you just have to be careful and remember petrol is highly flammable stuff.