Grief Update - Engine Rebuild

Grief Update - Engine Rebuild

Author
Discussion

lancelin

205 posts

86 months

Wednesday 17th March
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Do those air filters clear the bonnet ok?

Matthew Poxon

Original Poster:

5,283 posts

138 months

Wednesday 17th March
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The leads will have lead separators fitted, we did not have enough of the 2x lead ones to do a neat job so they have been cable tied for the minute. I was looking at getting some more MSD ones but they are very expensive.

The filters do indeed clear the bonnet with room above to spare surprisingly enough.


spitfire4v8

3,547 posts

146 months

Thursday 18th March
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To add another viewpoint, I regularly cable tie HT leads together and to my knowledge have never in 40 years of working on cars had an instance of cross firing between leads. It *might* have been an issue back in the days of copper cored leads, poor insulation and damp weather, but these days I'd be very very very surprised if you had any issues whatsoever. It might be seen as bad practice by some, but in the real world it seems to matter not one jot.

Pink_Floyd

894 posts

186 months

Thursday 18th March
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Matthew Poxon said:
Electronic water pump and Speed Six water / oil heat exchanger sighted.
What does the water circuit look like with these installed.

Zener

17,831 posts

186 months

Thursday 18th March
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spitfire4v8 said:
To add another viewpoint, I regularly cable tie HT leads together and to my knowledge have never in 40 years of working on cars had an instance of cross firing between leads. It *might* have been an issue back in the days of copper cored leads, poor insulation and damp weather, but these days I'd be very very very surprised if you had any issues whatsoever. It might be seen as bad practice by some, but in the real world it seems to matter not one jot.
Agree with this Steve , but for the low cost of pukka plug wire/HT leads separators I know what route I would choose biggrin

Steve_D

13,262 posts

223 months

Thursday 18th March
quotequote all
My understanding is that it is not a failing of the insulation but a current induced in wire 2 by the spark in wire 1.

Steve

ETA just did a quick Google and found mention of the problem in a ford service bulletin (Ford 5.0L HEI for leads 7 & 8).

Edited by Steve_D on Thursday 18th March 20:20

Boosted LS1

19,741 posts

225 months

Thursday 18th March
quotequote all
Magnetism.

spitfire4v8

3,547 posts

146 months

Friday 19th March
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Steve_D said:
My understanding is that it is not a failing of the insulation but a current induced in wire 2 by the spark in wire 1.

Steve

ETA just did a quick Google and found mention of the problem in a ford service bulletin (Ford 5.0L HEI for leads 7 & 8).

Edited by Steve_D on Thursday 18th March 20:20
Fair comment and good work finding an example - just my experience is that it has never happened on anything i've cable tied leads together on. I think I found the same reference as you on a google search, however there was in fact very little about ht lead cross firing on the net which also suggests it's not a big issue either. The fact Ford issued a bulletin is worthy of note though.

Accepted it's better practice to have them separated .. but no garages to my knowledge for example separate out the HT leads running through the spark plug cover on the speed six engines, or the cerbera 4.2s which run along the coolant rails ? Just 2 tvr related examples where the leads run side by side with no issues. The Sp6 example is notable in that all 6 leads run against each other at the very rear of the engine, squashed in by the cover, so a very real chance of induction between consecutive firing cylinders there, and yet no problems.
As I say, it's good practice to separate them, but it's very unusual to have an issue if not.

anyway, as you were ..

lancelin

205 posts

86 months

Friday 19th March
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I’m interested in this. I could be paranoid but I had high quality ignition leads and notice very occasional sparks jumping between leads. Only noticeable in pitch dark with all the lights off. I was surprised. Perhaps it’s corona and doesn’t effect the actual spark to the plug.

Boosted LS1

19,741 posts

225 months

Friday 19th March
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I imagine that every spark you saw was one that didn't make it to the plug. It can be quite revealing looking around an engine bay under darkness.

Zener

17,831 posts

186 months

Friday 19th March
quotequote all
lancelin said:
I’m interested in this. I could be paranoid but I had high quality ignition leads and notice very occasional sparks jumping between leads. Only noticeable in pitch dark with all the lights off. I was surprised. Perhaps it’s corona and doesn’t effect the actual spark to the plug.
No thats bad and needs to be adressed frown

Penelope Stopit

8,344 posts

74 months

Saturday 20th March
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Boosted LS1 said:
Magnetism.
spitfire4v8 said:
Steve_D said:
My understanding is that it is not a failing of the insulation but a current induced in wire 2 by the spark in wire 1.

Steve

ETA just did a quick Google and found mention of the problem in a ford service bulletin (Ford 5.0L HEI for leads 7 & 8).

Edited by Steve_D on Thursday 18th March 20:20
Fair comment and good work finding an example - just my experience is that it has never happened on anything i've cable tied leads together on. I think I found the same reference as you on a google search, however there was in fact very little about ht lead cross firing on the net which also suggests it's not a big issue either. The fact Ford issued a bulletin is worthy of note though.

Accepted it's better practice to have them separated .. but no garages to my knowledge for example separate out the HT leads running through the spark plug cover on the speed six engines, or the cerbera 4.2s which run along the coolant rails ? Just 2 tvr related examples where the leads run side by side with no issues. The Sp6 example is notable in that all 6 leads run against each other at the very rear of the engine, squashed in by the cover, so a very real chance of induction between consecutive firing cylinders there, and yet no problems.
As I say, it's good practice to separate them, but it's very unusual to have an issue if not.

anyway, as you were ..
As commented by Boosted LS1

There is no magnetism, no magnetic flux, no induction

If it were possible to happen there would be millions of ECU's constantly failing due to high induced voltages being generated in low voltage circuits, low voltage electrical cables are often run along with or across HT cables, bulbs wouldn't enjoy the HT voltage

Cross firing can take place is if there are two or more HT cables with damaged insulation in contact with one another

BMW 325 HT Lead run below



Richieboy3008

972 posts

148 months

Sunday 4th April
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Matthew Poxon said:
Apologies for the lack of updates, I work for the NHS so I have been absolutely snowed under as of late.

Electronic water pump and Speed Six water / oil heat exchanger sighted


Swirl tank modified, custom bracket made for PAS reservoir, aeroquip fuel hoses installed on fuel rails. Mocal Oil catch can sighted. Replacement swirl tank made from alloy is on order



The fuel lines that run from the fuel pump to the fuel rail have been replaced. The old ones where not in great shape, The fuel pump has been replaced with a pump from a TVR Cerbera which has increased flow rate over the standard Griffith version.


ITG filters installed, igintion leads installed, EWP, catch can custom brackets made and mounted.



Carbon Canister removed, washer bottle mounted on rear of access panel, filler nosel and cap 3D printed




Bracket 3D printed for MBE ECU screen. AFR gauge fitted.


The car has been collected from Jody at Python Racing and is now back at Powers Performance for final commissioning and ECU mapping.
Spanking