Search found 434 matches

by GDCobra
Tue Sep 30, 2025 6:28 pm
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: 3.9 EFi Fuel Rails?
Replies: 5
Views: 201

Re: 3.9 EFi Fuel Rails?

I made one myself from some aluminium thick walled tube and turned up some ends. The high pressure pump (Bosch 044 copy) piggy backs onto it drawing fuel from the bottom via an inline filter. Top has 3 AN fittings welded on for: Return from fuel rail, Feed from lop pressure pump in tank, Return to m...
by GDCobra
Tue Aug 19, 2025 7:48 pm
Forum: Engines Area
Topic: John Eales crank damper, oil seal journal eccentricity
Replies: 1
Views: 521

Re: John Eales crank damper, oil seal journal eccentricity

Are you sure you have that amount of run-out? How are you measuring it? Assuming that is total indicated reading hence double the amount of eccentricity. I don't know what value will give you a problem but if I'd bought a, presumably expensive, new item and found that much error in it I would not be...
by GDCobra
Thu Jul 24, 2025 1:03 pm
Forum: Electrical & Ignition Area
Topic: Ignition advance with ECU controlled ignition - Should it be this high?
Replies: 8
Views: 2432

Re: Ignition advance with ECU controlled ignition - Should it be this high?

Depends how you are determining "want" ? First of all lets just forget about the timing table for a moment, this is early days with this and I'm focussing first on getting the idle condition something like right as I was having issues in this area. As a test I decided to see how the timin...
by GDCobra
Wed Jul 23, 2025 4:43 pm
Forum: Electrical & Ignition Area
Topic: Ignition advance with ECU controlled ignition - Should it be this high?
Replies: 8
Views: 2432

Re: Ignition advance with ECU controlled ignition - Should it be this high?

Have you verified base timing ? ie, flatline timing at 0deg, 10 deg, 20 deg and check/confirm with a timing light ? Thanks for the feedback StevieT. Yes. I'm not really sure what you mean by 'flatline' but I checked the timing at 10° using fixed advance (regardless or RPM or vacuum the advance will...
by GDCobra
Tue Jul 22, 2025 8:26 pm
Forum: Electrical & Ignition Area
Topic: Ignition advance with ECU controlled ignition - Should it be this high?
Replies: 8
Views: 2432

Re: Ignition advance with ECU controlled ignition - Should it be this high?

Where does the MS pick up its firing point? Presuming a toothed wheel with a tooth missing? If so is the MS actually fire the spark? At the gap, at the next tooth or something like 15 degrees after the gap…….I seem to remember reading about 20 years ago it was the third option above. So the MS coul...
by GDCobra
Tue Jul 22, 2025 8:07 pm
Forum: Electrical & Ignition Area
Topic: Ignition advance with ECU controlled ignition - Should it be this high?
Replies: 8
Views: 2432

Re: Ignition advance with ECU controlled ignition - Should it be this high?

That does sound very high. I'm running Speeduino (very similar to MS2) and I'm idling at about 9/10 degrees. You can add photos directly into your post by using the 'Attachments' tab below the 'Save draft/Preview/Submit' buttons (or as it suggests just dragging the picture files into this edit box)...
by GDCobra
Mon Jul 21, 2025 9:14 pm
Forum: Electrical & Ignition Area
Topic: Ignition advance with ECU controlled ignition - Should it be this high?
Replies: 8
Views: 2432

Ignition advance with ECU controlled ignition - Should it be this high?

This may ring a bell with some of you in the collective as it's something I've been working with for a few years now, unfortunately due to other life pressures and being lazy it's still going on. Some time back I converted my ignition to run via ECU control from the previous distributor based system...
by GDCobra
Mon Jun 16, 2025 9:12 pm
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: ROVER V8 NO HEAD GASKET!!??
Replies: 3
Views: 706

Re: ROVER V8 NO HEAD GASKET!!??

The RV8 engine doesn't have much in the way of galleries, particularly water, on the head/block interface so I guess it's possible to get away with it to some degree if both faces are flat. Doesn't mean it's a good idea to do it though, just as well you've spotted it.
by GDCobra
Sun Jun 15, 2025 3:08 pm
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: Vacuum leak test
Replies: 1
Views: 854

Re: Vacuum leak test

What cam are you running? One with high overlap will result in lower than expected compression test values (although a 15PSI spread seems a little high) and higher than expected manifold pressure (lower vacuum) at idle. I don't understand hg but 11 seems like that will be about 62.75kPa. Mine runs a...
by GDCobra
Thu Jun 05, 2025 1:18 pm
Forum: Engines Area
Topic: 1990s Range Rover 4.6ltr V8 Timing failure
Replies: 25
Views: 4385

Re: 1990s Range Rover 4.6ltr V8 Timing failure

Looks to me like you need a new distributor/oil pump drive gear, neither picture indicates a camshaft problem.
The gear is a seperate part.
by GDCobra
Tue May 06, 2025 5:36 pm
Forum: Engines Area
Topic: RV8 - Crank case Ventilation.
Replies: 6
Views: 1731

Re: RV8 - Crank case Ventilation.

I wanted to reply but it would only be an educated guess based on my experience rather than knowing so I got put off. Yes my educated guess is that they are the same - BUT if wrong the drill hole goes through a water jacket or something else. Hence yes I want responses from people who actually know...
by GDCobra
Tue May 06, 2025 3:03 pm
Forum: Engines Area
Topic: RV8 - Crank case Ventilation.
Replies: 6
Views: 1731

Re: RV8 - Crank case Ventilation.

I wanted to reply but it would only be an educated guess based on my experience rather than knowing so I got put off.
by GDCobra
Tue Apr 29, 2025 9:36 pm
Forum: Engines Area
Topic: Throttle body identification
Replies: 4
Views: 1923

Re: Throttle body identification

Looks a bit bigger all over, may just be the picture. Didn't some Jag's have a similar throttle?
by GDCobra
Tue Apr 15, 2025 12:27 pm
Forum: Engines Area
Topic: Thor TPS with 14CUX
Replies: 1
Views: 1312

Re: Thor TPS with 14CUX

Don't see why not, presuming the Thor TPS is just potentiometer as per the earlier type then the output would be between "just over 0v" to "just under 5v". Only issue I'd see is if the closed throttle output was too high as there is an upper limit for the minimum voltage (0.078v ...
by GDCobra
Mon Apr 14, 2025 8:05 am
Forum: Engines Area
Topic: Piston- Deck clearance
Replies: 8
Views: 2066

Re: Piston- Deck clearance

I can't measure at the wrist pin due to valve cutouts and piston dishes, so I am measuring at the inner most edge of the piston, with a DTI and rocking to get two measurements, then averaging. I am zeroing the dti on the deck face adjacent to where I am measuring on the piston. I'm trying to visual...

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