Dear Fellow Brickboaders,

May this find you well. What are the differences - in dimensions, fastener number/location, sensor opening number/location, etc. - between a header pipe that will fit a car with Bosch fuel/ignition management and a header pipe that will fit a car with Rex/Regina fuel/ignition management?

Volvo VADIS - the now-superseded dealer parts/maintenance database - shows different part numbers. Yet, some aftermarket suppliers claim "one pipe fits both", while others have a header pipe specific to each fuel/ignition management system.

I'd guess the only way to answer this, is to lay the two pipe types next to each other.

It is not obvious to me, why the fuel/ignition management system would require any difference in a header pipe, when the basic engine is the same.

I hope to have the benefit of your insights.

Yours faithfully,

Spook

Dear Donn,

May this find You well. For 940s made after 1991, the VIN (Vehicle Identification Number) does show whether the Bendix (Rex/Regina) fuel/ignition management system is present and also whether or not EGR (Exhaust Gas Recirculation) is present.

The eighth position in the VIN deals with emissions. It is always a numeral. It means, if
0 = Basic Version (e.g., Bosch fuel/ignition management)
1 = with EGR
2 = not used
3 = alternationa fuel/ignition management, e.g., Bendix (Rex/Regina).
(Source: Volvo pocket data booklet: Cars - 700,850,900 󞩷-1996], p.4 𖘴/900].)

Apparently, EGR was not installed on cars with Bendix fuel/ignition management systems. As there are always exceptions to any Volvo Rule, I expect a reply that there is indeed a B230F engine, with Rex/Regina fuel/ignition management, that also has EGR!!

I RENEW MY QUESTIONS: Does anyone actually know if there are dimensional or other differences between a header pipe, to be installed on an engine with the Rex-Regina fuel/ignition management system, versus a header pipe to go on an engine, with the Rex/Regina fuel/ignition management system?

If so, what are those differences, e.g., are the openings for the oxygen sensor in different places, do the pipes have different lengths, shapes, etc.?

Thanks for your help.

Yours faithfully,

Spook