Search found 887 matches

by MarekH
Fri Aug 07, 2020 3:59 pm
Forum: Series 2
Topic: oscillating idle and lack of power
Replies: 18
Views: 1010
Great Britain

Re: oscillating idle and lack of power

Peter, Your camshaft rotates at half the speed of the crankshaft, so bear that in mind when you populate your advance map with numbers - you will never see 3000-6000rpm on the table because 3000 camshaft revolutions equal 6000 crank revolutions and "rpm" conventionally refers to crank revolutions un...
by MarekH
Sun Aug 02, 2020 2:23 pm
Forum: Series 2
Topic: oscillating idle and lack of power
Replies: 18
Views: 1010
Great Britain

Re: oscillating idle and lack of power

Your MAP sensor seems to read quite low values quite often. I wonder about its positioning and whether a lower lag factor may help. Often constricting the tube to the sensor helps reduce fluctuation. This isn't the cause of your problem as you have your ignition set independently of MAP, i.e. only v...
by MarekH
Sat Aug 01, 2020 6:57 am
Forum: Series 3
Topic: Courtesy light Wire routing S3 (RHD) OTS
Replies: 2
Views: 141
Great Britain

Re: Courtesy light Wire routing S3 (RHD) OTS

You haven't mentioned it, but if your courtesy light doesn't come on then it may be because the switch is faulty, so simply plugging things in or out may not help. The loom typically has connections in a bundle of wires above the door hinges at either end of the outer dashboard crash roll. To correc...
by MarekH
Wed Jul 29, 2020 3:58 pm
Forum: Series 3
Topic: Moving Seats Back
Replies: 4
Views: 205
Great Britain

Re: Moving Seats Back

With just some extension plates on the front, I don't think you'd lose headroom, as that forces the seat to slightly tip back. If you attach those plates (suitably angled) to the underside of the front captive nuts, you can keep exactly the same headroom as before. You'd lose headroom if you were to...
by MarekH
Wed Jul 29, 2020 1:07 pm
Forum: Technical
Topic: vac
Replies: 18
Views: 731
Great Britain

Re: vac

Vacuum is indeed very powerful. At just 1000rpm, your 3.8 litre engine is shifting 31 litres of air per second, compressing it down almost tenfold, so leaving a 28 litre "hole" in the airflow behind it. That gives a 50%drop in air pressure in its wake. (That's what Chergar could manage and I'm guess...
by MarekH
Wed Jul 29, 2020 9:34 am
Forum: Series 3
Topic: Moving Seats Back
Replies: 4
Views: 205
Great Britain

Re: Moving Seats Back

Dear Neil, Firstly you'd have to see how far forward your seat goes, as this will show the two rear mounting bolts and how much further forward on the runner you can drill an additional two holes. These can be your new rear mounting positions for the runner. At the front, you now have to fabricate a...
by MarekH
Tue Jul 21, 2020 4:10 pm
Forum: Series 3
Topic: 73 bonnet questions
Replies: 4
Views: 245
Great Britain

Re: 73 bonnet questions

Here's a picture of the left side of the bonnet, from the inside, looking forwards. On the left is the fender and on the right is the centre section. You can see through the headlight opening. At the bottom is the left hand indicator. If you trace the line along the underpan to topside join, the fen...
by MarekH
Tue Jul 21, 2020 3:50 pm
Forum: Series 3
Topic: 73 bonnet questions
Replies: 4
Views: 245
Great Britain

Re: 73 bonnet questions

No, the exact opposite. The six inches or so (to about halfway along the indicators) of the bonnet centre section nearest the radiator opening are rebated upwards by about 3mm so the flanges of bd42130 and bd42131 fit into the gap. Only the underpan is unchanged, exactly as you surmised. The later b...
by MarekH
Tue Jul 21, 2020 7:38 am
Forum: Series 3
Topic: 73 bonnet questions
Replies: 4
Views: 245
Great Britain

Re: 73 bonnet questions

Yes, the later bonnet is totally different. By 1974, aside from the two ~2" holes in the front to take the crash bar through the bonnet, the gap between the centre section and the underpan is wider by a few mm to accommodate this flange where it bolts in between the two. Beyond that, there is no gap...
by MarekH
Wed Jul 15, 2020 8:37 pm
Forum: Series 3
Topic: 1973 Series 3 Bonnet Strut Replacement
Replies: 3
Views: 269
Great Britain

Re: 1973 Series 3 Bonnet Strut Replacement

Yes they have.
Yes it is.
No there aren't any.

Just get a large sturdy cardboard box and put it on top of the engine so you don't get your head chopped off and use a pair of 9/16 spanners at either end of the strut.

kind regards
Marek
by MarekH
Sun Jul 12, 2020 10:13 pm
Forum: Series 3
Topic: V12 Overheating: The contributing factors
Replies: 12
Views: 430
Great Britain

Re: V12 Overheating: The contributing factors

Philip, There is a major flaw in the design of the v12 etype which isn't addressed earlier in this thread which is that there is only one temperature sensor and one gauge which are on the right hand bank. This may indicate correctly and not warn you of a fault on the left hand bank. The left hand fr...
by MarekH
Sun Jul 12, 2020 9:59 pm
Forum: Series 3
Topic: V12 Overheating: The contributing factors
Replies: 12
Views: 430
Great Britain

Re: V12 Overheating: The contributing factors

A contributing factor to NOT overheating is having enough time to do something about the cooling system if it is not performing (or alternatively shutting down the heat generation system if you like). In that respect, an 82'c thermostat gives you more warning time than an 88'c thermostat by the time...
by MarekH
Sun Jul 12, 2020 9:29 pm
Forum: Series 3
Topic: V12 Overheating: The contributing factors
Replies: 12
Views: 430
Great Britain

Re: V12 Overheating: The contributing factors

Philip, Be aware that thermostats exhibit hysteresis. The temperature/opening curve on the way up is not quite the same as the temperature/opening curve on the way back down. That probably isn't important, but you want to be consistent with how others measure if you want to compare against them. The...
by MarekH
Sun Jul 12, 2020 9:33 am
Forum: Series 3
Topic: V12 Overheating: The contributing factors
Replies: 12
Views: 430
Great Britain

Re: V12 Overheating: The contributing factors

Colin, Do remember that it is a design feature of the thermostat that it has a spring loaded foot. This means it is an anticipated design feature that it will block off the bypass completely. It also blows a hole in most of your arguments. Thermal shock? Really? The biggest thermal shock is starting...
by MarekH
Sat Jul 11, 2020 9:08 pm
Forum: Series 3
Topic: V12 Overheating: The contributing factors
Replies: 12
Views: 430
Great Britain

Re: V12 Overheating: The contributing factors

Philip, Other considerations are that the header tank, crossover pipe, heater matrix return pipe, cylinder liners and the radiator inlet pipes are made of steel (plus a couple of small fittings for sensors). This means there is ample scope for rust to accumulate in solution. Most of this solidifies ...
by MarekH
Tue Jul 07, 2020 12:25 pm
Forum: General
Topic: Jagurar E Type S3 on Elevator
Replies: 2
Views: 387
Great Britain

Re: Jagurar E Type S3 on Elevator

Using wood blocks will help not damage the car and may help spread the load. The best jacking points are where the car has vertical and horizontal surfaces meeting, e.g. just behind and outboard of the where the IRS trailing arm large bushes meet the car body and also where the front torsion bar rea...
by MarekH
Tue Jul 07, 2020 12:14 pm
Forum: Technical
Topic: pre-programmed curves on 123 ignition - help please?
Replies: 53
Views: 1629
Great Britain

Re: pre-programmed curves on 123 ignition - help please?

A map or curve taken from an archive will be different from that you get from that determined on a rolling road. Aside from the changes in the salient factors pointed out by Steve, the rolling road operator will instantly see whether the car produces more or less torque as he advances or retards the...
by MarekH
Mon Jul 06, 2020 11:44 am
Forum: Series 3
Topic: Series 3 Manual Gearbox Photo Request
Replies: 4
Views: 374
Great Britain

Re: Series 3 Manual Gearbox Photo Request

That will be a true rarity, as 3/4 of production will have been autoboxes and for the US market. The custom relay, in that case, was mounted at the outside top front of the tunnel over, ahead of the gearshift mechanism.

The 1974 copy of the Parts Manual may give some guidance.

kind regards
Marek
by MarekH
Mon Jun 29, 2020 7:56 am
Forum: Series 3
Topic: Not all cylinders firing...
Replies: 7
Views: 441
Great Britain

Re: Not all cylinders firing...

OK, so I misunderstood your post. You are saying the same set of cylinders never fire under both cranking and running conditions, near as matters. You said you changed the "advance sensor". I'm not sure what you mean by that, but the cylinders fire after a sensor inside the distributor is triggered ...
by MarekH
Fri Jun 26, 2020 9:53 pm
Forum: Series 2
Topic: STARTING CAR WITH FUEL SYSTEM COMPLETELY DRY...
Replies: 10
Views: 501
Great Britain

Re: STARTING CAR WITH FUEL SYSTEM COMPLETELY DRY...

There is no point cranking the engine if there is no fuel in the float bowls. You'll simply thrash the battery, heat the battery cables, but it won't fire up until petrol gets into the cylinders. Switch the ignition on so the fuel pump runs and fills the carburettor float bowls. Only then is there a...