Urgent! What HT lead goes where??
Discussion
cjs said:
Hello all
I'm just fitting some new HT leads on my RV8 Griff, the old ones have no numbering so I don't know which is Cylinder 1,2,3 etc. I can work it out if someone can tell me which is number 1 and which way the Dizzy spins.
Ta!
I can answer your questions but I won't, because you're asking the wrong questions. Nobody can tell you which lead goes where, because the #1 position on the dizzy depends on how the dizzy was installed. I'm just fitting some new HT leads on my RV8 Griff, the old ones have no numbering so I don't know which is Cylinder 1,2,3 etc. I can work it out if someone can tell me which is number 1 and which way the Dizzy spins.
Ta!
Just replace the leads one at a time, starting with the longest lead and then the next longest and so on. Remove the old lead and fit the new lead before you do the next one, so there is no possible confusion about which one went there.
GreenV8S is spot on.
See my comments on this thread
http://www.pistonheads.co.uk/gassing/topic.asp?h=0...
Oh, you will also find on here some useful details of firing order etc.
A tip from me, when you do replace your leads, use a marker and number your dizzy cap too - or your spare if you carry it all the time.
See my comments on this thread
http://www.pistonheads.co.uk/gassing/topic.asp?h=0...
Oh, you will also find on here some useful details of firing order etc.
A tip from me, when you do replace your leads, use a marker and number your dizzy cap too - or your spare if you carry it all the time.
This may be a stupid question, but I will ask it any way.
Does it matter which lead you fit to which opening in the Dizzy? I know that the ordering is important, but does it matter if you are 45/90 or more degrees further around than shown in the diagram?
The reason I ask is because the diagram in the bible does not match with my dizzy. The distributor vacume is in a different place relative to the engine block, so it is difficult to get a sense of the orientation.
Does it matter which lead you fit to which opening in the Dizzy? I know that the ordering is important, but does it matter if you are 45/90 or more degrees further around than shown in the diagram?
The reason I ask is because the diagram in the bible does not match with my dizzy. The distributor vacume is in a different place relative to the engine block, so it is difficult to get a sense of the orientation.
Alex Gurr said:
This may be a stupid question, but I will ask it any way.
Does it matter which lead you fit to which opening in the Dizzy? I know that the ordering is important, but does it matter if you are 45/90 or more degrees further around than shown in the diagram?
The reason I ask is because the diagram in the bible does not match with my dizzy. The distributor vacume is in a different place relative to the engine block, so it is difficult to get a sense of the orientation.
It matters, but cars are not all the same. It depends what orientation the dizzy drive shaft was at relative to the crank when the dizzy was fitted. There's a 'standard' orientation but it's very common to move things around to get better clearance, and some people just bung them on and then figure out what lead needs to go where afterwards. So yes you need to get it exactly right, but you can't assume that 'exactly right' for you matches what you see in a book or on somebody else's car.Does it matter which lead you fit to which opening in the Dizzy? I know that the ordering is important, but does it matter if you are 45/90 or more degrees further around than shown in the diagram?
The reason I ask is because the diagram in the bible does not match with my dizzy. The distributor vacume is in a different place relative to the engine block, so it is difficult to get a sense of the orientation.
GreenV8S said:
Alex Gurr said:
This may be a stupid question, but I will ask it any way.
Does it matter which lead you fit to which opening in the Dizzy? I know that the ordering is important, but does it matter if you are 45/90 or more degrees further around than shown in the diagram?
The reason I ask is because the diagram in the bible does not match with my dizzy. The distributor vacume is in a different place relative to the engine block, so it is difficult to get a sense of the orientation.
It matters, but cars are not all the same. It depends what orientation the dizzy drive shaft was at relative to the crank when the dizzy was fitted. There's a 'standard' orientation but it's very common to move things around to get better clearance, and some people just bung them on and then figure out what lead needs to go where afterwards. So yes you need to get it exactly right, but you can't assume that 'exactly right' for you matches what you see in a book or on somebody else's car.Does it matter which lead you fit to which opening in the Dizzy? I know that the ordering is important, but does it matter if you are 45/90 or more degrees further around than shown in the diagram?
The reason I ask is because the diagram in the bible does not match with my dizzy. The distributor vacume is in a different place relative to the engine block, so it is difficult to get a sense of the orientation.
I suppose there are actually only 4 options really. The ordering will be as per the bible, but with 4 options for orientation - 0/90/180/270 degrees.
alex,remove the dissy cap,leave the rotor arm on and turn the front pulley till the timing marks line up 0 on the pulley or TDC(top dead centre)in line with the timing marker on the front cover. the rotor arm should now be pointing at where no1 cylinder is on the cap (usually at about 7 o clock if you imagine it as a clock face)then follow the firing order in a clockwise direction as per diagram
Edited by nemasis on Sunday 24th June 10:59
nemasis said:
alex,remove the dissy cap,leave the rotor arm on and turn the front pulley till the timing marks line up 0 on the pulley or TDC(top dead centre)in line with the timing marker on the front cover. the rotor arm should now be pointing at where no1 cylinder is on the cap (usually at about 7 o clock if you imagine it as a clock face)then follow the firing order in a clockwise direction as per diagram
Assuming that the TDC reference mark is accurate, that'll either get you in the right place or exactly 180 degrees out i.e. you've reduced the possible permutations from 8 to 2, but it still leaves a little trial and error. You can eliminate this by taking the plug out of #1 cylinder and sticking your thumb over the hole as you turn the engine over slowly by hand. You can feel the compression as the piston approaches TDC on the firing stroke, and this confirms that the rotor arm should be pointing towards the #1 lead.Alex Gurr said:
Oh cr*p. So basically, because I whiped all the HT leads off without marking their position on the Dizzy I am going to have to work out where they go back by trial and error.
I suppose there are actually only 4 options really. The ordering will be as per the bible, but with 4 options for orientation - 0/90/180/270 degrees.
There are eight options i.e. every 45 degrees. You could try the standard orientation and see if you get lucky, but if that fails you really need to start from scratch and work out where the #1 lead is. From there you can simply work clockwise round the dizzy adding the other leads 18436572.I suppose there are actually only 4 options really. The ordering will be as per the bible, but with 4 options for orientation - 0/90/180/270 degrees.
If you're in a hurry and feeling lucky you can simply pull all the injector plugs off but one, turn the engine over for a second and see if it fires, if not move the #1 lead round one position and try again. Once you have found #1 reconnect all the injectors and fit the remaining leads. The danger is that it's easy to flood the plug by cranking the engine over with the timing out, so you may find you go right round without any success. Safer to start from scratch as described above.
PS next time replace the leads one by one!
Lesson learnt though.Gassing Station | Griffith | Top of Page | What's New | My Stuff