Posted: Tue Aug 10, 2010 3:27 pm
Update, after buying an innovate wide band afr gauge i have learnt alot about jetting. I cannot recommend it enough to get fueling right. For example, when working blind, i found going much richer made my v8 feel stronger so i kept going richer. When in fact all i was doing was jetting the primaries so rich that they would cover the whole rev range without the secondaries. As soon as i plugged the afr in i knew exactly where i was rich ( everywhere) and rejetted. My v8 now pulls even better and is 'good' on fuel too!
I have updated the rest of this post with my current jetting for reference.
For all those that come across this post using the search engine in the future........
The solution for me this time was jetting.
By jetting up a couple of sizes a I now have a V8 which pulls strongly.
I previously thought I had disproved jetting by pulling the choke on under load (richening up), but this theory did not work.
I have now jetted up to 52 on the primary main jets and 54 on the secondaries. I removed a bog off idle with a larger accelerator nozzle and cam.
To change the secondary main jetting on the vac secondary carb, you have to buy the conversion kit which i bought from Real Steel.
I hope this helps someone in the future.
And thank you to all those who gave helpful suggestions this time.
Kind regards
Simon
For reference:
My engine is a 3.5 SD1 9.35:1
Mild Kent (200) cam
Stage 1 heads
Holley list 8007 model 4160 carb on Offy 360 manifold
range rover matched cast manifolds with 2" down pipes down to 2.5" single straight through exit with large cherry bombs.
I have updated the rest of this post with my current jetting for reference.
For all those that come across this post using the search engine in the future........
The solution for me this time was jetting.
By jetting up a couple of sizes a I now have a V8 which pulls strongly.
I previously thought I had disproved jetting by pulling the choke on under load (richening up), but this theory did not work.
I have now jetted up to 52 on the primary main jets and 54 on the secondaries. I removed a bog off idle with a larger accelerator nozzle and cam.
To change the secondary main jetting on the vac secondary carb, you have to buy the conversion kit which i bought from Real Steel.
I hope this helps someone in the future.
And thank you to all those who gave helpful suggestions this time.
Kind regards
Simon
For reference:
My engine is a 3.5 SD1 9.35:1
Mild Kent (200) cam
Stage 1 heads
Holley list 8007 model 4160 carb on Offy 360 manifold
range rover matched cast manifolds with 2" down pipes down to 2.5" single straight through exit with large cherry bombs.