Search found 1009 matches

by MarekH
Sun Apr 11, 2021 11:01 am
Forum: Technical
Topic: Another clutch mystery for me
Replies: 9
Views: 301
Great Britain

Re: Another clutch mystery for me

The clutch system can simply be gravity bled normally - there is an open path all of the way normally and there is no unsealed part until the pedal is pressed part way down. That means you are suggesting that a seal is deforming under moderate pressure but only takes takes up the final "correct" sha...
by MarekH
Sat Apr 10, 2021 1:55 pm
Forum: Technical
Topic: 1966 ignition look wiring and function
Replies: 3
Views: 209
Great Britain

Re: 1966 ignition look wiring and function

I have never even seen a 1966 car before, but you seem to be describing a faulty connection either at/in the ignition switch or at the ammeter. I'd clean all of the connections and the inside of the switch. Like I said, you need to make a truth table to determine what should be connected to what whe...
by MarekH
Sat Apr 10, 2021 6:12 am
Forum: Technical
Topic: 1966 ignition look wiring and function
Replies: 3
Views: 209
Great Britain

Re: 1966 ignition look wiring and function

If you have a high voltage produced by the alternator, then the regulator is not regulating. It does this by switching the field coil on and off such that the average voltage becomes ~14v. One side of the field coil is connected to the battery positive feed and the other goes to the regulator. When ...
by MarekH
Mon Apr 05, 2021 5:10 pm
Forum: Series 3
Topic: I got twins at 58!
Replies: 1
Views: 133
Great Britain

Re: I got twins at 58!

You also appear to have plenty move garage space available........ so keep going!
kind regards
Marek
by MarekH
Mon Apr 05, 2021 11:44 am
Forum: Series 3
Topic: Fan temperature sensor
Replies: 28
Views: 996
Great Britain

Re: Fan temperature sensor

Tom, There is nothing wrong in incorporating new technology into our cars. I can easily imagine that fitting a massive Coolcat fan onto a new radiator will mean it won't be necessary to run the larger more powerful fans as much, or that such a car can be safely run hotter because it can drop the tem...
by MarekH
Sun Apr 04, 2021 8:01 pm
Forum: Series 3
Topic: Fan temperature sensor
Replies: 28
Views: 996
Great Britain

Re: Fan temperature sensor

Tom, what Mazda chose to do with a twin fan setup for a car with a totally different engine and a much smaller volume of coolant is up to them and has no bearing on what is needed for 5.3litre engine mounted in a confined space and with 19 litres of coolant circulating. To add to that, their fans sh...
by MarekH
Sat Apr 03, 2021 9:35 pm
Forum: Series 2
Topic: Removing the rear side marker lights
Replies: 10
Views: 751
Great Britain

Re: Removing the rear side marker lights

From me - I can make you a custom set if you like.
Send me an email or a pm.
kind regards
Marek
by MarekH
Sat Apr 03, 2021 10:25 am
Forum: General
Topic: series 3 bouncing rev counter
Replies: 4
Views: 275
Great Britain

Re: series 3 bouncing rev counter

Then it probably isn't a complete loss of connection, but an inconsistent input. I'd get (or borrow) another tacho of the same type on ebay for a few pounds (even a six cylinder one or xjs item will do) and check to see whether it behaves the same way. If it does, then the problem is upstream and no...
by MarekH
Sat Apr 03, 2021 8:16 am
Forum: General
Topic: series 3 bouncing rev counter
Replies: 4
Views: 275
Great Britain

Re: series 3 bouncing rev counter

Rather than saying it bounces, are you saying it records zero and returns to the correct value periodically? If so, it is likely something is not making a good electrical connection and that includes the earthing of the tacho itself. If you think it is SNGB related, then ask them how their tacho sig...
by MarekH
Sat Apr 03, 2021 8:08 am
Forum: Series 3
Topic: Fan temperature sensor
Replies: 28
Views: 996
Great Britain

Re: Fan temperature sensor

Dear Tom, these sorts of FETs simply weren't available 15 years ago when I was designing and prototyping these sorts of things. The options available to us now far exceed our wildest dreams and the main concern these days is that the technology moves on so fast that these chips get removed from the ...
by MarekH
Fri Apr 02, 2021 8:47 pm
Forum: Series 3
Topic: Fan temperature sensor
Replies: 28
Views: 996
Great Britain

Re: Fan temperature sensor

This is a classic case of a solution not doing what you think it claims to . It doesn't actually increase the cooling capacity of the system - it simply half turns the fans on when the original system still has some untapped cooling capacity of its own. The penny drops when, in the video, Tom explai...
by MarekH
Fri Apr 02, 2021 6:45 am
Forum: Series 3
Topic: Dashboard removal
Replies: 1
Views: 155
Great Britain

Re: Dashboard removal

It is very easy. The dashboard is made up of two parts. The part nearer the cabin is held by just four nuts holding onto four captive bolts on its lower face. Two are reached from under the dash at the door edges and other two are visible once the centre gauges panel is lowered. If you need to remov...
by MarekH
Thu Apr 01, 2021 7:37 pm
Forum: Series 3
Topic: Fan temperature sensor
Replies: 28
Views: 996
Great Britain

Re: Fan temperature sensor

Whether or not you are "cooling earlier" is down to the thermostat - it controls the flow to the radiator, not the temperature at the Otter switch. I think you may have meant "cooling more rapidly", rather than earlier, as running the fan earlier is obviously putting more airflow into the equation. ...
by MarekH
Thu Apr 01, 2021 10:33 am
Forum: Series 3
Topic: Fan temperature sensor
Replies: 28
Views: 996
Great Britain

Re: Fan temperature sensor

You are switching them on and off with full power every time. Whether that consumes more or less power than their steady state always-on running condition is a function of the on:off pwm ratio. Take a look at the graph of inductive load current versus time - it's not a square tooth profile. kind reg...
by MarekH
Thu Apr 01, 2021 9:58 am
Forum: Series 3
Topic: Fan temperature sensor
Replies: 28
Views: 996
Great Britain

Re: Fan temperature sensor

That's right - running a fan (pre-emptively or not) just does the cooling quicker, not "more". Consider a thought experiment. You have three radiators:- a rubbishy small blocked radiator, the stock radiator, and an infinitely powerful fan assisted radiator. At 73'c, it makes no difference - the radi...
by MarekH
Thu Apr 01, 2021 9:37 am
Forum: Series 1
Topic: FACTORY FIT - Series 1 3.8
Replies: 291
Views: 468587
Great Britain

Re: FACTORY FIT - Series 1 3.8

I'm not sure a 2mm difference in flange size is an indicator of originality, especially when ought to have been measured in fractions of an inch anyway. It does remind me of one detail previously overlooked:- the first hundred or so cars have the Sikaflex bonded in on these flanges is going from rig...
by MarekH
Wed Mar 31, 2021 9:23 pm
Forum: Technical
Topic: Otter Switches
Replies: 4
Views: 340
Great Britain

Re: Otter Switches

The appropriate "temperature range" will be related to the thermostat opening temperature. Expect your radiator to pull ~13'c out of the coolant, or to look at it the other way, expect the engine to add ~13'c to the coolant temperature it receives back. If you succeed in dropping the temperature dow...
by MarekH
Wed Mar 31, 2021 8:54 pm
Forum: Series 3
Topic: Fan temperature sensor
Replies: 28
Views: 996
Great Britain

Re: Fan temperature sensor

Philip, you may be slightly overthinking this. If the temperature is or may become too high, why do you want to half run the fans? You just want to run them full-on, and when you do, the thermostats will soon shut off the flow to the radiator anyway, so any further attempts at cooling will be thwart...
by MarekH
Wed Mar 31, 2021 7:08 pm
Forum: Series 2
Topic: Removing the rear side marker lights
Replies: 10
Views: 751
Great Britain

Re: Removing the rear side marker lights

One enterprising owner at Bicester a few years ago simply used some black masking tape over the hole. He had a black car and I didn't even notice he'd done it until he pointed it out. If you get some very thin vinyl and spray that body colour, then you'll achieve the same for next to no cost. There ...
by MarekH
Wed Mar 17, 2021 8:49 pm
Forum: Series 3
Topic: Dashboard lighting
Replies: 5
Views: 391
Great Britain

Re: Dashboard lighting

If you are handy with a soldering iron, then you can replace each bulb with a green LED with the appropriate resistor. For the two big gauges, you need four high brightness LEDs per bulb holder. I have my panel lights wired to come on when the other lights are on. (A separate "dim" setting isn't app...