Page 130 of 130
Re: 265 Hemi to efi
Posted: Mon Sep 06, 2021 2:21 pm
by heff0018
Read the manual during lunch and yes surprising they modified the standard carb to deliver AFR 15:1 at idle and 18:1 at cruising speeds. The system consists of the computer bolted to the air cleaner (obviously a poor location choice), distributor, throttle position transducer, vacuum transducer, carb idle switch and coolant temperature switch.
Re: 265 Hemi to efi
Posted: Tue Sep 07, 2021 8:03 am
by Charlescrown
Yea I never really understood how it worked. They seem to be doing it all with vacuum and calling the box on the air filter a computer. I don't think there's a microprocessor in there. I had a brand new carbie for one and gave it away to an old mate who then moved into a nursing home so it probably got thrown in a cleanup.
Re: 265 Hemi to efi
Posted: Tue Sep 07, 2021 9:01 am
by heff0018
Ha yes I should have written 'computer' in quotation marks. The 'computer' basically adjusts the ignition advance in relation to both vacuum and throttle position.
Per the manual 'the computer consists of an electronic printed circuit board that is the programme schedule function and the ignition control function'.
The coolant temp sender just signals the ignition to bypass the programme on start up and revert to the fixed advance of 10 degrees. I spoke to an ELB specialist yesterday and he said most problems with the systems were caused by dud temp sensors that put the ignition in permanent bypass and therefore the ignition only ever received 10 degrees of advance. The quick fix is to disconnect the temp sensor and the power and economy is restored. There have probably been a lot of ELB systems removed for this very reason.
Re: 265 Hemi to efi
Posted: Tue Sep 07, 2021 11:48 am
by Charlescrown
The problem is it's not that easy because you need to change jets in the carbie to get things correct. 18:1 to me is out of the range of flammability or very close to it. I think that's why the extra timing because the mixture is burning so slow compared to a 15:1 mix.
Re: 265 Hemi to efi
Posted: Tue Sep 07, 2021 3:07 pm
by heff0018
Charlescrown wrote:The problem is it's not that easy because you need to change jets in the carbie to get things correct. 18:1 to me is out of the range of flammability or very close to it. I think that's why the extra timing because the mixture is burning so slow compared to a 15:1 mix.
Yes that is correct, it is difficult to get the fuel to ignite at 18:1 and so the engine timing needed to be very accurate.