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914World.com _ 914World Garage _ /6 distributor curve question
Posted by: tornik550 Apr 7 2017, 01:37 PM
I have a /6 2.7l with E cams. Should I base my distributor curve on the cams that I am using or the displacement? If you had my setup- would you go with a 2.2e distributor or a 2.7s distributor?
Posted by: GeorgeRud Apr 7 2017, 03:34 PM
Does the 2.2 distributor fit in the 2.7 case? I thought they were different sizes.
Posted by: tornik550 Apr 7 2017, 03:37 PM
Does the 2.2 distributor fit in the 2.7 case? I thought they were different sizes.
The 2.2 doesn't fit the 2.7 case. I actually have a programmable distributor and I was just going to input the specs.
Posted by: GeorgeRud Apr 7 2017, 03:59 PM
On my 2.7 with an HPV-1 Clewitt ignition, we ended up with 8 degrees initial advance with an additional 25 degrees added at 3000 RPM, then no additional advance at 6000. I'm running RS pistons with S cams and Webers.
Posted by: tornik550 Apr 7 2017, 04:06 PM
On my 2.7 with an HPV-1 Clewitt ignition, we ended up with 8 degrees initial advance with an additional 25 degrees added at 3000 RPM, then no additional advance at 6000. I'm running RS pistons with S cams and Webers.
This may sound silly however was there any sort of a curve or was the advance 8 at all rpm til 3000 and all rpm above 3000 was 25?
Posted by: gereed75 Apr 7 2017, 05:16 PM
Tornik There are a bunch of curves on line like these below.
http://forums.pelicanparts.com/porsche-911-technical-forum/590346-timing-2-4-mfi-t.html
Remember the rpm curves are based on distributor rpm - half the engine rpm.
Posted by: mb911 Apr 7 2017, 05:42 PM
I am pretty sure the 2.7 and down distributor Are interchangeable as far as fit.. That said the curves are all different..
Posted by: GeorgeRud Apr 7 2017, 08:31 PM
The 25 degrees are added linearly to the initial 8 degrees. The HPV-1 does not have near the capabilities of more modern ignition systems, but has been reliable and simple.
Posted by: porschetub Apr 9 2017, 12:43 AM
Not sure so don't know what year was the reverse rotation dizzy 2.7 or later ?.
I have 2.4 MFI dizzy and have removed the vacuum retard can lock out the retard on the advance and run it as a a pure mechanical advance ,yet to fit so don't know should work,easier to get parts for than the Marreli besides.
Posted by: porschetub Apr 9 2017, 01:09 AM
Does the 2.2 distributor fit in the 2.7 case? I thought they were different sizes.
The 2.2 doesn't fit the 2.7 case. I actually have a programmable distributor and I was just going to input the specs.
Sorry failed to read your reply ,would you have said they needed machining down and changing the gear ?...just don't remember what I read a while back on this.
Posted by: mb911 Apr 9 2017, 06:39 AM
Not sure so don't know what year was the reverse rotation dizzy 2.7 or later ?.
I have 2.4 MFI dizzy and have removed the vacuum retard can lock out the retard on the advance and run it as a a pure mechanical advance ,yet to fit so don't know should work,easier to get parts for than the Marreli besides.
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