265 Hemi to efi

Converting To Delco ECU From Carby Or Other Injection Systems
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Re: 265 Hemi to efi

Postby Holden202T » Mon Nov 18, 2019 8:35 pm

yeah i can see the hours in that!!

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Re: 265 Hemi to efi

Postby vlad01 » Tue Nov 19, 2019 10:55 am

Yeah my rule is, cost and hours at a realistic estimate, then multiply that by 3 :lol:
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Re: 265 Hemi to efi

Postby heff0018 » Tue Nov 19, 2019 6:41 pm

Those ribs took forever to straighten out but there is actually stuff all filler in them. I knew they would be the first point of contact for anything slid in or out of the back so any filler would just get chewed out.

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Re: 265 Hemi to efi

Postby heff0018 » Tue Nov 19, 2019 6:49 pm

What do you reckon happened here. These were checked before the Fast ignition box was installed and were fine. It was only two of the six spark plugs affected but I didn’t notice what cylinders they came from. One was probably from the same cylinder that the MLS gasket failed
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Re: 265 Hemi to efi

Postby heff0018 » Tue Nov 19, 2019 6:58 pm

Just realised I hadn’t mentioned the MLS gasket failure. This obviously happened before i took it to Whyalla hence why it was losing coolant. I took the head to the machine shop and got the gasket face cleaned up and they installed plugs in the coolant galleries. We decided to do this once we realised the MLS gasket had these blocked off anyway. It will give the chamber less of an excuse to relieve itself in the coolant holes. Amazing it ran so hard considering the leak.
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Re: 265 Hemi to efi

Postby vlad01 » Tue Nov 19, 2019 7:40 pm

Detonation, quite bad one too.
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Re: 265 Hemi to efi

Postby delcowizzid » Tue Nov 19, 2019 8:35 pm

Detonation and very hot plugs 5s are so hot in an ngk I would probably run 7s if it has compression. we run 6s still but low compression and avgas. You are also running non resistor plugs you want bpr6efs or bpr7efs or TR6 it's a 6 heat range but non projected tip and acts a little cooler
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Re: 265 Hemi to efi

Postby Gampy » Tue Nov 19, 2019 9:00 pm

Totally agree with Delco ...

Looks like 5 dark threads, that equates to about 2 heat ranges hot, that agrees with Delco, to 7's I would go ...

Can't stop detonation damage without stopping the detonation, however you can help the MLS hold up, ensure the surfaces are absolutely perfectly clean during assembly, any residual oil or other contaminate on the surfaces causes burn and failure.
That gasket shows signs of contaminates upon assembly.

I personally use Brake-Clean to clean the surfaces and a final wipe with Isopropyl Alcohol on a lint free.
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Re: 265 Hemi to efi

Postby heff0018 » Wed Nov 20, 2019 5:55 am

Thanks for the replies. I hadnt considered the plug heat range, these are just the same type of plugs I have previously in these engines

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Re: 265 Hemi to efi

Postby Charlescrown » Wed Nov 20, 2019 6:16 am

Agree with everyone. Just a question. Was the detonation damage to the head gasket on the opposite side to the spark plug?

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