240260280z

try normal timing and jets at normal enrichment

Here is a DIY approach to a similar problem: Datsun 240Z Restoration - Front Chassis

Take it to a body shop that straightens frames for assessment by an expert. It looks like it will need pulling and welding.

It says "down pipe" (DP) so I assume turbo.

Just found this great graph. It plots A/F at down pipe of a Subaru as well as the simultaneous tail pipe A/F. It seems to show: Tail pipe A/F accurately represents manifold A/F Tail pipe follows manifold by pipe-propagation-delay time. Manifold more accurately captures fast transients. These transients are reduced in amplitude at the tail pipe. So for carb a/f monitoring, use the manifold for accelerator pump transient tuning. The tail pipe is fine for all other carb tuning.

A 1971 is always a 1971 but a 6 month old is only 6 months old once.

I'll do my best to help remotely

Reading plugs is always a good learning experience. You can do it at idle... just try idling for 5 min at 1.5, then 2.5, then 3.5 the 4.5 turns for each setting. Read the middle plug for each carb (plugs 2 & 5) and watch the colour change. Both plugs should get darker and should be identical if you have the jet heights and needle to piston fit correct. btw I set the air fuel on my oil fired furnace eyeballing the flame colour. A year later i had it tested and was within 2% so the principal of colour-tune is sound...however it only sets idle. You really need an O2 sniffer for checking idle, cruise and WOT (if you want to try to adjust these for performance or fuel efficiency or for the best compromise). The SU's are designed for set and forget so colour tune should be fine for daily driving.

"72 UK Brochure" from Ebay UK. It is similar. LHD is strange. No "Bumperettes"? Are they required for regional regulations elsewhere? Source:http://www.ebay.co.uk/itm/Datsun-Nissan-240Z-1972-UK-Market-Sales-Brochure-/180745452284

Some helpful info in these sites: http://www.cardomain.com/ride/3029098/1971-datsun-240z/ >> CLASSIC CARS LTD, Pleasanton California << http://www.classiczcars.com/forums/scarab/3092-datsun-scarab-info.html

Looks diy based on a motorcycle helmet's visor

Looking for a complete MegaJolt system for a club racer. L28 3.1 litre

you heard that too! What did the drawings look like? I think BMW were in the same style with this: don't forget this movie prop:

I get 4 or 5 a day. They seem to last ~ 15min. Often they occur when posting a pic. In fact I just had one for the past 15min.

Has AC too

Opps!

Getting too many of these everyday!

observation: 2 to 3 turns on idle enrichment changes idle A/F 7 points 2 to 3 turns on idle enrichment changes cruise (3000rpm) A/F 3 points A/F at cruise and idle is balanced ~ 2.5 turns but rich at ~ 12.5 A/F is richer at idle than at cruise at greater than 2.5 turns out. My goal is get idle and cruise balanced ~ 14 to 15 A/F....waiting on 45 idle jets as next step.

Yup. a/f is important. I use an O2 in the tail to get the A/F balanced when running on a single carb. In steps 8 to 11 I set the A/f to ~ 27 to 30 for each carb by adjusting the jet on the working carb. I then go for 14-15 at idle. Anything else requires piston weight and spring changes...and/or needle re-profiling.

Yes, the owners Mark and Kathy are wonderful couple. Very kind, enthusiastic, friendly and polite...the world needs more.

Check your plugs too.

Yup, that is shown beside it. Now I don;t feel bad with 20 degrees at idle with no vac on L24 with triple webers. It is less than stock. I also get 37 at WOT using the ZX distributor.

From the above (assuming manifold vacuum is used): 71 timing at idle is 17 +11 = 28 71 timing at WOT is 17 + 12 = 29 78 timing at idle is 10 + 18 = 28 78 timing at wOT is 10 + 19 = 29

Looking at initial timing and advance in FSM's and engine manuals 1970 17 @ 650 _6.0 mech 5.5 vac and 5 @ 750 12.0 mech 9.0 vac 1971 17 @ 650 _6.0 mech 5.5 vac and 5 @ 750 12.0 mech 9.0 vac 1972 17 @ 650 _6.0 mech 5.5 vac 1973 _5 @ 750 12.0 mech 7.0 vac 1974 _8 @ 750 13.0 mech 6.0 vac 1975 13 @ 800 10.0 mech 7.5 vac 1976 13 @ 800 10.0 mech 7.5 vac 1977 10 @ 800 _8.5 mech 9.0 vac 1978 10 @ 800 _8.5 mech 9.0 vac 1982 _8 @ 800 _8.5 mech 15.0 vac