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bronsonarlo
05-08-2009, 10:51 AM
What would be the best carb for a 9:1 head? I am looking to put a 9:1 performance head on for better power, but didn't know if I should keep my Zeinth carb.
NC Rover
05-08-2009, 01:27 PM
What would be the best carb for a 9:1 head? I am looking to put a 9:1 performance head on for better power, but didn't know if I should keep my Zeinth carb.

I have a Turner Engineering head with oversized intake/exhaust valves & mild grind off of the stock cam. Currently using the Weber 32/34 DMTL carb and its fantastic.
greenmeanie
05-08-2009, 08:47 PM
You are gaining compression with the 9:1 head but not flow. Your existing carb should be fine but may need rejetted depending on what else you've done.
Tim Smith
05-09-2009, 06:01 PM
The best performing carb I've ever had was the SU carb as fitted with the ACR performance package. I never idled smooth but boy did it pack a wallop... for a rover.

It should be noted that the header was modified for the carb and there were other goodies like a twisted cam. So this may be out of your range. Check the ACR website for prices. http://www.automotivecomp.com

Another thing to note. The above power plus kit only got about 10 miles per gallon. My Weber 34ICH with a standard set up gets around 18 if I'm good. Performance is as you'd expect
bobzinak
05-11-2009, 03:43 PM
I too have a acr SU carb set up with a performance plus 2.5 (2.8) My milage has always been good..If I behave when I drive. the best I've ever gotten was 310 miles from full tank to running dry..Typically between 250 and 275 miles per tank (12.5 gallons) this is a vast improvement over my old rodchester..witch was 12 to 17 mpg..Bobzinak
gudjeon
05-11-2009, 08:13 PM
I run a bog standard rebuilt 2.25 w/7:1 head and Pertronix in the distributor and Zenith carb. I have no overdrive and I can get 24mpg on the hwy.:thumb-up:
LaneRover
05-11-2009, 08:30 PM
I run a bog standard rebuilt 2.25 w/7:1 head and Pertronix in the distributor and Zenith carb. I have no overdrive and I can get 24mpg on the hwy.:thumb-up:

Imperial or US?

Also, what is your definition of highway or highway speed? :-)
gudjeon
05-11-2009, 10:13 PM
I run around 60 mph on the highway, when topography allows of course. Just a tad under the 100km/hr posted limit here (checked with GPS) and 24mpg Imperial and 20mpg US lite gallons. I'm talking winding Canuck highway here.
LaneRover
05-12-2009, 12:31 AM
20 on US is still pretty damn good!
Tim Smith
05-12-2009, 08:21 AM
I agree.

Out of curiosity gudjeon, what tires are you running?
gudjeon
05-12-2009, 01:50 PM
I run 215/85/r16 light truck radials.