Search found 718 matches

by MarekH
Tue Jun 18, 2019 5:45 pm
Forum: Series 3
Topic: Weak Spark 76 XJS
Replies: 11
Views: 200
Great Britain

Re: Weak Spark 76 XJS

Dear Andrew, You are partly answering your own question:- a coil with a high resistance will pull less current than a lower resistance coil and so make a less powerful spark at the same voltage. Two gotchas:- firstly, the XJS manual may not cover the car you think it does. The original XJS ignition ...
by MarekH
Tue Jun 18, 2019 5:32 pm
Forum: Series 2
Topic: Headlight covers for my 69 XKE
Replies: 4
Views: 173
Great Britain

Re: Headlight covers for my 69 XKE

There are a number of people who have tried both. In each case, they purchased the Wahl kit first and then later came to me. You can always talk to someone independent like Harry Fulford in California. I can send you a set of fitting instructions which go into the background requirements and steps y...
by MarekH
Sun Jun 09, 2019 7:36 pm
Forum: Series 3
Topic: Exhaust manifold
Replies: 2
Views: 190
Great Britain

Re: Exhaust manifold

Because they are bolted in tight at the top, if the mounting flanges are very different thicknesses, then the downpipe will not line up well when viewed front to back and that is where you have a problem making sure you don't foul the engine frames. You may find you have no problem, but you may equa...
by MarekH
Mon Jun 03, 2019 9:53 am
Forum: Series 1
Topic: Sovy Failure
Replies: 47
Views: 1719
Great Britain

Re: Sovy Failure

If someone (probably Julian) wants to send me a couple of clean unused bottles, I think I might be able to fix this.
kind regards
Marek
by MarekH
Tue May 21, 2019 6:37 am
Forum: Technical
Topic: Replace fuel line banjo - epoxy resin?
Replies: 11
Views: 457
Great Britain

Re: Replace fuel line banjo - epoxy resin?

It was probably silver soldered, as the metals may have been too unlike in properties and not have enough copper in one of them for regular solder.

kind regards
Marek
by MarekH
Wed May 15, 2019 6:37 am
Forum: Series 3
Topic: ECU on EFI cars
Replies: 21
Views: 938
Great Britain

Re: ECU on EFI cars

That is substantially different information to that which you have previously given.
Good luck with your project.

kind regards
Marek
by MarekH
Tue May 14, 2019 5:23 pm
Forum: Technical
Topic: Replace fuel line banjo - epoxy resin?
Replies: 11
Views: 457
Great Britain

Re: Replace fuel line banjo - epoxy resin?

If you had purchased the brass fitting then you could have just soldered that back together very easily. My advice would be to return the item and do the job properly. I don't think epoxy resin will automatically bond well to either material and have no confidence in its long term ability to absorb ...
by MarekH
Tue May 14, 2019 7:33 am
Forum: Technical
Topic: Broken window frame
Replies: 8
Views: 283
Great Britain

Re: Broken window frame

It is one part of a large chrome "H" structure which bolts into the bottom of the door. You'll have to dismantle the entire door insides to retrieve it . Then you can decide what to do with the two pieces, assuming spares are not readily available.

kind regards
Marek
by MarekH
Mon May 13, 2019 8:07 am
Forum: Series 3
Topic: ECU on EFI cars
Replies: 21
Views: 938
Great Britain

Re: ECU on EFI cars

There is a wide continuum between "pay someone else for everything and get them to fit an old retuned ECU from the 1980s" to "I'll read up and then design and build my own gear" and Michel has chosen to be somewhere in the middle. There is nothing wrong in principle with what he is doing and I can't...
by MarekH
Sun May 12, 2019 8:40 am
Forum: Series 3
Topic: ECU on EFI cars
Replies: 21
Views: 938
Great Britain

Re: ECU on EFI cars

Michel, You aren't starting from scratch; you are starting with an ECU which has hardware and software which is wired up for a totally different engined car. This may well be a worse starting point than with a blank Megasquirt ("MS"), as the MS has very clear instructions as to how to go from zero t...
by MarekH
Sat May 04, 2019 5:41 am
Forum: Technical
Topic: Window winder repairs
Replies: 3
Views: 259
Great Britain

Re: Window winder repairs

If you look at how these wear then it is likely that only the middle few teeth of the large semi-circular gear are significantly worn - the teeth at either end of the semi-circle are usually still perfectly good. If this is the case, then a quicker alternative is to then take a replacement large sem...
by MarekH
Fri Apr 26, 2019 8:01 pm
Forum: Series 3
Topic: Front indicator lenses Series 3
Replies: 10
Views: 357
Great Britain

Re: Front indicator lenses Series 3

Current UK legislation for cars built after 1989 is for the minimum height to be 35cms and the s2/3 etype front indicator placement falls right down the middle of this. My hunch is that this is an XJ12 question, in that one wants to look at the height of the XJ12 front indicators and work backwards....
by MarekH
Fri Apr 26, 2019 9:22 am
Forum: Technical
Topic: Making fuel tank installation easier.
Replies: 5
Views: 323
Great Britain

Re: Making fuel tank installation easier.

You can also Dremel about half a centimetre off of the the front and rear lip of the tank, i.e. the bit outside of the seam weld as viewed towards the front and back of the car. This means the tank will fit the gap it has to go into without any problems with it being a tight fit. After that, doing u...
by MarekH
Sat Apr 20, 2019 6:22 am
Forum: Series 3
Topic: Fuel vapour Lock
Replies: 1
Views: 131
Great Britain

Re: Fuel vapour Lock

If you floor the accelerator when hot cranking, then the extra airflow will clear out the manifolds, pull fresh air/fuel mix through and thus force new cooler fuel to be admitted into the float bowls. The other suggestion is to keep the tank topped up higher. If you have a large reservoir of relativ...
by MarekH
Fri Apr 19, 2019 12:33 pm
Forum: Technical
Topic: Malpassi fuel pressure regulator
Replies: 44
Views: 1134
Great Britain

Re: Malpassi fuel pressure regulator

Steve, when in doubt, do a thought experiment and imagine a limiting case: - let's make the restriction truly absolutely microscopically tiny and have only one such tiny hole per cylinder. We need to bump up the pressure to about 3.5bar to deliver enough atomised fuel within the time dictated by the...
by MarekH
Fri Apr 19, 2019 12:17 pm
Forum: Technical
Topic: Malpassi fuel pressure regulator
Replies: 44
Views: 1134
Great Britain

Re: Malpassi fuel pressure regulator

1/ If the pressure differential between the inlet and outlet goes down to zero, the flow will go down to zero. 2/ The liquid is incompressible so where do you suppose the flow goes? If there is a solid restriction past the pump, then won't the pump's rubber diaphragm flex and bulge rather than push ...
by MarekH
Fri Apr 19, 2019 9:49 am
Forum: Technical
Topic: Malpassi fuel pressure regulator
Replies: 44
Views: 1134
Great Britain

Re: Malpassi fuel pressure regulator

I'd take a contrary view and suggest that you want the fuel pressure to be as high as possible, subject to it not being so high that the float bowls are prevented from sealing the carburettor from the pump. The reason for this is that I'd want to have my float bowls recharged as quickly as possible ...
by MarekH
Tue Apr 16, 2019 12:31 pm
Forum: Technical
Topic: Malpassi fuel pressure regulator
Replies: 44
Views: 1134
Great Britain

Re: Malpassi fuel pressure regulator

No I'm not Christopher. Perhaps I should have used the phrase "may return fuel to the tank", as a regulator designed for use with a low pressure lift pump such as the SU doesn't need a return, whereas one used with a high pressure, high volume pump for fuel injection, will. The word "cap" doesn't im...
by MarekH
Tue Apr 16, 2019 7:19 am
Forum: Technical
Topic: Malpassi fuel pressure regulator
Replies: 44
Views: 1134
Great Britain

Re: Malpassi fuel pressure regulator

A regulator is typically only useful if a non-standard higher pressure pump is fitted and works by capping the pressure and returning the excess to the tank. The SU pump already has that cap enabled by design. The pump spec is chosen to shift enough volume of fuel at redline rpm and do so at a press...
by MarekH
Thu Apr 11, 2019 5:55 pm
Forum: Series 3
Topic: ECU on EFI cars
Replies: 21
Views: 938
Great Britain

Re: ECU on EFI cars

Dear Michel, The harness you are proposing to use assumes that the battery is in the boot and so you will need to adapt it for a battery in the engine bay. To put it in the boot without putting a bulge into the carpet or into the inner sill, you'll have to be very creative and probably run the loom ...