That sandcast 5 bearing engine made good power in the end after you had run it in and got your head around tuning it. Well done 👍 those new cam carriers are pretty special 😍
Great information, love the machining and the photos at Autosport. I had a 7.2liter Jensen SP and they are known for poor running, coughing splitting and stalling. 4.3inch bore! I fitted an MSD 6al and it then ran like a singer sowing machine! Multiple sparks at low rpm and capacitor discharge spark! Horse for corses
16:15 Yeah the theory is that if you've got a spark the mixture goes bang, I had/have the same theory but there are some caveats which the MSD will help you with. For starters the spark has to have enough energy (joules) within the spark to start the burn process. Also if the spark does not actually light the mixture then the following power stroke is totally dead, at least with the MSD it will attempt to light the mixture 5 times as there are five sparks. Admittedly the ignition point will end up being retarded but the power stroke will do something towards making power which is better than nothing. Having said all that the multi spark idea is mainly to get around the fact that a capacitor discharge spark has a short duration. The other good thing with a capacitor discharge system is that it takes much less time to charge a cap' than it does to charge a coil, this means that you still get a high energy spark at high rpm, in fact at high rpm with with points and a coil you will probably not get any spark at all every now and again, it just feels like the engine is naturally reaching the end of its rev range but in fact its the ignition system that is failing to provide sparks consistently. At the very least as the revs rise in a points and coil system the energy stored in the coil will get less and less as the revs rise, the coil just does not get 'saturated'. I had this with a Rover V8 4.6 that I had a big valve gas flowed, big cam, better inlet and exhaust, the usual stuff, with the stock electronic DML8 system the peak power felt like 4,500 RPM, it just felt like the engine did not make power at higher rpm, I then went to an MSD system and the engine would easily rev to 6k rpm, peak power was actually at 5,500 rpm. My mate was running a similar 4.6 in an Opel Manta, he got the same improvement when we switched it out to an MSD system.
You have my sympathy. I gave up taking holidays 20 years ago because as a small businessman I would tell my clients that I was going on holiday, which inevitably meant that everyone wanted their job done before you left that generated so much stress that it took 1/2 of the holiday to wind down. When I got back however, all the clients then had an opportunity to look through what I sent them, which resulted in a massive list of mods. The only solace that I got was when the major clients themselves went on holiday, which meant that I could relax for two weeks!
Greats videos..with all this fueling talk i was wondering why thottle bodies and aftermarket ignition are not more common... Is it related to historic competitions.. .. does fuel injection offer a significant advantage in an imp? Thanks again for all your very generous content...😊
Years ago I posted up on one of these videos that Andy should look at using an MSD system, I use the programable 6AL along with a MAP system on any road engine that I build (Rover v8 lumps mainly), You don't need a dyno to feel the improvement at ALL rpm ranges, the idle sounds better and you can feel the engine pulling harder and revving higher than with the standard ignition setup. I like things to look stock so I actually remove all the guts out of the standard Rover dizzy and then fit an MSD trigger, it is triggered by the standard Rover (Lucas) trigger wheel, the dizzy is locked out, no bob weights, the advance curve is programmed into the MSD. Andy is using points to trigger the MSD, this is the easy option but not ideal, any sort of electronic method of triggering the unit would be better, points are bound to have 'timing scatter' 15:50 When Andy say look at that spark, well it ain't one spark, every time the MSD unit is triggered (at low rpm) it fires 5 sparks! ('M' means multi, has in multi spark!)
If you used a crank trigger with the 6AL you would be stuck with 'fixed' timing, i.e. no advance curve, this would not be very good, if you used the programable 6AL then a crank trigger is a great idea, you could program in any advance curve that you like! You can also run a MAP system for vac advance which I think is a good idea for any car engine that spends a lot of time with the throttle just cracked open.
the point of the huge spark energy of the 6 al is that nitromethane fuel is run at close to hydrolock rich as it contains its own oxygen! drag cars dump stupid amounts of fuel into their engines relying on the oxygen in the fuel!
That sandcast 5 bearing engine made good power in the end after you had run it in and got your head around tuning it. Well done 👍 those new cam carriers are pretty special 😍
very interesting as always
Great engineering
Another great watch. The BRISCA finale looked spectacular. Thanks as usual.
Great to see the younger generation using their noddle when it comes to machining operations that are quite different.
Great information, love the machining and the photos at Autosport. I had a 7.2liter Jensen SP and they are known for poor running, coughing splitting and stalling. 4.3inch bore! I fitted an MSD 6al and it then ran like a singer sowing machine! Multiple sparks at low rpm and capacitor discharge spark! Horse for corses
16:15 Yeah the theory is that if you've got a spark the mixture goes bang, I had/have the same theory but there are some caveats which the MSD will help you with. For starters the spark has to have enough energy (joules) within the spark to start the burn process. Also if the spark does not actually light the mixture then the following power stroke is totally dead, at least with the MSD it will attempt to light the mixture 5 times as there are five sparks. Admittedly the ignition point will end up being retarded but the power stroke will do something towards making power which is better than nothing. Having said all that the multi spark idea is mainly to get around the fact that a capacitor discharge spark has a short duration.
The other good thing with a capacitor discharge system is that it takes much less time to charge a cap' than it does to charge a coil, this means that you still get a high energy spark at high rpm, in fact at high rpm with with points and a coil you will probably not get any spark at all every now and again, it just feels like the engine is naturally reaching the end of its rev range but in fact its the ignition system that is failing to provide sparks consistently. At the very least as the revs rise in a points and coil system the energy stored in the coil will get less and less as the revs rise, the coil just does not get 'saturated'. I had this with a Rover V8 4.6 that I had a big valve gas flowed, big cam, better inlet and exhaust, the usual stuff, with the stock electronic DML8 system the peak power felt like 4,500 RPM, it just felt like the engine did not make power at higher rpm, I then went to an MSD system and the engine would easily rev to 6k rpm, peak power was actually at 5,500 rpm. My mate was running a similar 4.6 in an Opel Manta, he got the same improvement when we switched it out to an MSD system.
no just no that is not how it works
@@markscully2342 Yes, just yes, that is exactly how it works.
Mint!
You have my sympathy. I gave up taking holidays 20 years ago because as a small businessman I would tell my clients that I was going on holiday, which inevitably meant that everyone wanted their job done before you left that generated so much stress that it took 1/2 of the holiday to wind down. When I got back however, all the clients then had an opportunity to look through what I sent them, which resulted in a massive list of mods. The only solace that I got was when the major clients themselves went on holiday, which meant that I could relax for two weeks!
I found the offset machining really interesting 👍
Greats videos..with all this fueling talk i was wondering why thottle bodies and aftermarket ignition are not more common... Is it related to historic competitions.. .. does fuel injection offer a significant advantage in an imp? Thanks again for all your very generous content...😊
As entertaining as ever Andy - great stuff 👍🏻👍🏻👍🏻
That MSD electronic ignition is a taser in drag,,,, 😂😂
Years ago I posted up on one of these videos that Andy should look at using an MSD system, I use the programable 6AL along with a MAP system on any road engine that I build (Rover v8 lumps mainly), You don't need a dyno to feel the improvement at ALL rpm ranges, the idle sounds better and you can feel the engine pulling harder and revving higher than with the standard ignition setup. I like things to look stock so I actually remove all the guts out of the standard Rover dizzy and then fit an MSD trigger, it is triggered by the standard Rover (Lucas) trigger wheel, the dizzy is locked out, no bob weights, the advance curve is programmed into the MSD.
Andy is using points to trigger the MSD, this is the easy option but not ideal, any sort of electronic method of triggering the unit would be better, points are bound to have 'timing scatter'
15:50 When Andy say look at that spark, well it ain't one spark, every time the MSD unit is triggered (at low rpm) it fires 5 sparks! ('M' means multi, has in multi spark!)
I’m surprised that Andy’s still using the points as a trigger. It’s always going to be a weakness in the system
Multi spark discharge and a crank trigger 👍
If you used a crank trigger with the 6AL you would be stuck with 'fixed' timing, i.e. no advance curve, this would not be very good, if you used the programable 6AL then a crank trigger is a great idea, you could program in any advance curve that you like! You can also run a MAP system for vac advance which I think is a good idea for any car engine that spends a lot of time with the throttle just cracked open.
the point of the huge spark energy of the 6 al is that nitromethane fuel is run at close to hydrolock rich as it contains its own oxygen! drag cars dump stupid amounts of fuel into their engines relying on the oxygen in the fuel!
I moved away from the screen when you went to 2 1/2 thousand . I see you still like to use cast iron grinding paste on your ways !
Kit from down under