Grief Update - Engine Rebuild

Grief Update - Engine Rebuild

Author
Discussion

Matthew Poxon

Original Poster:

5,308 posts

153 months

Wednesday 17th March 2021
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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

3,840 posts

161 months

Thursday 18th March 2021
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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

900 posts

201 months

Thursday 18th March 2021
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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

18,475 posts

201 months

Thursday 18th March 2021
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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

13,628 posts

238 months

Thursday 18th March 2021
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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

20,703 posts

240 months

Thursday 18th March 2021
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Magnetism.

spitfire4v8

3,840 posts

161 months

Friday 19th March 2021
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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

232 posts

101 months

Friday 19th March 2021
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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

20,703 posts

240 months

Friday 19th March 2021
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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.

Penelope Stopit

10,229 posts

89 months

Saturday 20th March 2021
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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

1,728 posts

163 months

Sunday 4th April 2021
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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

Richieboy3008

1,728 posts

163 months

Tuesday 16th November 2021
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tumbleweed

spitfire4v8

3,840 posts

161 months

Wednesday 17th November 2021
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Matthew Poxon said:

Did you not go for a bypass thermostat and oil cooler / heater system in the end then? That looks like it's just flowing from the cold side of the radiator through the cooler, and not acting as an oil heater during warm up .. ?

Richieboy3008

1,728 posts

163 months

Saturday 15th January
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It must be done by now??

Richieboy3008

1,728 posts

163 months

Friday 6th May
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Any news?

LucyP

1,103 posts

39 months

Friday 6th May
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Seems that it is still not finished! The car is still shown as SORN and the MOT expired on 3rd April 2019. It must be a factory rebuild, in Wales, given the speed of progress.

It won't be long before Car SOS come along, listen to the sob story from the family, and take it away to finish it!

Richieboy3008

1,728 posts

163 months

Friday 6th May
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Any news?

LucyP

1,103 posts

39 months

Friday 6th May
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Yes, as I said. It's still off the road, and doesn't have an MOT, so it's still unfinished.

rev-erend

21,204 posts

264 months

Friday 6th May
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LucyP said:
Seems that it is still not finished! The car is still shown as SORN and the MOT expired on 3rd April 2019. It must be a factory rebuild, in Wales, given the speed of progress.

It won't be long before Car SOS come along, listen to the sob story from the family, and take it away to finish it!
hehe

Bluebottle

3,498 posts

220 months

Monday 9th May
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Matthew Poxon said:
Bracket 3D printed for MBE ECU screen..
Could do with one of these myself. Where did you get it done?