Search found 705 matches

by MarekH
Sat Apr 20, 2019 6:22 am
Forum: Series 3
Topic: Fuel vapour Lock
Replies: 1
Views: 30
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: 614
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: 614
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: 614
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: 614
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: 614
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: 3
Views: 141
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 ...
by MarekH
Tue Apr 09, 2019 12:19 pm
Forum: Technical
Topic: One Man Door Fitting Device.
Replies: 4
Views: 177
Great Britain

Re: One Man Door Fitting Device.

Geoff, that would be a bit silly as it simply means the doors are heavier and thus harder to handle. This is slightly over thought, but it is always nice to see some pictures. It is far easier to attach the hinge to the car and then hang the door. This way,you simply use an old cork floor tile gaffe...
by MarekH
Tue Apr 09, 2019 10:33 am
Forum: Series 2
Topic: Series 2 aesthetics
Replies: 203
Views: 62398
Great Britain

Re: Series 2 aesthetics

The MGB square lights used by Jaguar will have had markings on them. The clear inserts that make a standard s2 or s3 rear light into a "Lotus" light never had any markings on them. All I have done is change the festoon bulb for a brighter array of LEDs, neither of which ever had markings. The markin...
by MarekH
Tue Apr 02, 2019 11:15 am
Forum: Series 1
Topic: Side light lens
Replies: 6
Views: 331
Great Britain

Re: Side light lens

Dear Pat,

I have a set of very very pale amber s1 front lenses that would go well on your lightweight, given its silver paint. Just pop round some time and I'll dig them out.

kind regards
Marek
by MarekH
Tue Apr 02, 2019 11:11 am
Forum: Series 1
Topic: Side light lens
Replies: 6
Views: 331
Great Britain

Re: Side light lens

Dear Terry, I wouldn't take "it's a 2+2"" as the final word on the topic. You've described your car as a fhc, not a 2+2 for starters. There are also for more 2+2 cars out there than reports of these lenses. What I find curious is that in most (all?) cases, only one lens of the pair appears to be fat...
by MarekH
Tue Mar 26, 2019 6:01 pm
Forum: Series 3
Topic: S3 open lights to S1.5 lights conversion
Replies: 12
Views: 2510
Great Britain

Re: S3 open lights to S1.5 lights conversion

Dear Geoff,
I'll send you an email response directly when I have a bit more time this weekend.
kind regards
Marek
by MarekH
Mon Mar 25, 2019 1:04 pm
Forum: Technical
Topic: 3 SU-carbs: oscillating AFR-value
Replies: 13
Views: 407
Great Britain

Re: 3 SU-carbs: oscillating AFR-value

Sadly, I can't see your video, but... The AFR and rpm will move if either the air or the fuel quantities move about, and/or also if the amount of advance is moving. A flattish advance curve with a dip at idle will tend to stabilise idle. You will probably find that a stable idle will be slightly ric...
by MarekH
Tue Feb 19, 2019 4:00 pm
Forum: Series 3
Topic: Oil Pressure mystery
Replies: 7
Views: 380
Great Britain

Re: Oil Pressure mystery

Dear Chris, My car came already fitted with a mechanical gauge. The range doesn't need to extend past 80-psi as the big spring will open and cap the pressure at that level. The fittings fot it to mate it to the "T" at the back of the "V" can be purchased as spares from someone like Pirtek in the UK ...
by MarekH
Mon Feb 18, 2019 9:43 am
Forum: Series 3
Topic: tappet clearance
Replies: 14
Views: 945
Great Britain

Re: tappet clearance

I should add that you don't even remove the sprocket from the chain. Just unhook the sprockets from the camshafts, tie the sprockets and chain up together and hang them up where they are. You also don't want the distributor rotor arm to be pointing a different way prior and post stripdown. (That's w...
by MarekH
Sun Feb 17, 2019 10:42 pm
Forum: Series 3
Topic: Oil Pressure mystery
Replies: 7
Views: 380
Great Britain

Re: Oil Pressure mystery

Oil pressure is capped by the large spring thing next to the oil cooler/heat exchanger. For a cold start, it ought to show ~70lbs and stay there for a rebuilt engine at any rpm above idle. Idle when warm will drop to maybe 50lbs. Aside from that spring there is another "overflow" spring inside the o...
by MarekH
Sun Feb 17, 2019 5:38 pm
Forum: Series 3
Topic: tappet clearance
Replies: 14
Views: 945
Great Britain

Re: tappet clearance

I've never bothered with the chain tensioner tool. Once you have undone the four bolts holding the camshaft sprocket on, you can get it back on just by pulling a bit and if necessary, helping it along a bit with a big long screwdriver down the right hand side. There isn't so much tension in the tens...
by MarekH
Wed Feb 13, 2019 9:26 am
Forum: Series 3
Topic: USA over riders
Replies: 8
Views: 469
Great Britain

Re: USA over riders

Take a look at David Lacey's website for how to deal with the front bumpers without losing the functionality of the extra protection offered. At the rear, you may need to drill out some spot welds to release the rear cradle. Your new rear over riders will sit about 1" away from where the Euro spec o...
by MarekH
Wed Feb 13, 2019 7:20 am
Forum: Series 3
Topic: Loose valve tappet guide or?
Replies: 19
Views: 673
Great Britain

Re: Loose valve tappet guide or?

Dear Colin, It is perfectly normal for the valve stem guides to protrude. The only things they can do is become oval through excessive uneven wear or cracked when someone did a botched replacement and used a hammer on them rather than reaming out the hole and pressing in a new one. Not to be confuse...
by MarekH
Tue Feb 12, 2019 1:58 pm
Forum: Series 3
Topic: Loose valve tappet guide or?
Replies: 19
Views: 673
Great Britain

Re: Loose valve tappet guide or?

First step for ANY top end noise on an E Type. TIGHTEN THE TIMING CHAIN PROPERLY. So many times... There isn't anything to do (either properly or otherwise) on a v12, Andrew. The timing chain damper is either broken or it is not. If it is, then there will be a lot of noise as you come off of the po...