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914World.com _ 914World Garage _ Need a carb guru
Posted by: KaptKaos Jul 10 2012, 08:37 AM
I am getting to the end of my rope with these carbs, and may have finally come to the realization that I need some help in getting this car to run better.
Anyone have a recommendation for a carb tuner on the west side/southbay area of Los Angeles?
Engine is a 1.7 with a carb cam (unknown specs, but not stock), with 40 idfs and a SVDA dizzy. Exhaust is stock with a sebring muffler.
At wide open throttle, she pulls really well; part throttle and tip in is bad.
I would like to drive the car sometime this summer, but at this pace, it will be next year before I can get it sorted.
Thanks in advance.
Posted by: Steve Jul 10 2012, 08:45 AM
I am getting to the end of my rope with these carbs, and may have finally come to the realization that I need some help in getting this car to run better.
Anyone have a recommendation for a carb tuner on the west side/southbay area of Los Angeles?
Engine is a 1.7 with a carb cam (unknown specs, but not stock), with 40 idfs and a SVDA dizzy. Exhaust is stock with a sebring muffler.
At wide open throttle, she pulls really well; part throttle and tip in is bad.
I would like to drive the car sometime this summer, but at this pace, it will be next year before I can get it sorted.
Thanks in advance.
Ottos in Venice. He knows 914's and is very good with carbs.
Posted by: monkeyboy Jul 10 2012, 09:21 AM
I would recommend an air\fuel meter as well. It helps to watch and see if you are rich or lean at any time. Takes the guesswork out.
40's are a bit big for a 1.7. They are going to take some tuning.
Posted by: SLITS Jul 10 2012, 10:45 AM
Joe, you might want to check the venturi size. More than likely they are 32 mm. Going to a 28 mm would give you more "signal" at low and mid range RPM but would restrict the upper end flow.
I don't know anything about carbs so ignore this post.
Posted by: KaptKaos Jul 10 2012, 01:58 PM
Joe, you might want to check the venturi size. More than likely they are 32 mm. Going to a 28 mm would give you more "signal" at low and mid range RPM but would restrict the upper end flow.
I don't know anything about carbs so ignore this post.
Especially these carbs!
Anyways, I believe that they are 28 vents. I have it written down at home. I will, of course, double check that too.
Posted by: KaptKaos Jul 10 2012, 01:59 PM
Ottos in Venice. He knows 914's and is very good with carbs.
I know he does. I was thinking he's the last of last resorts, as it will likely cost me a bunch.
Posted by: yeahmag Jul 10 2012, 04:05 PM
Don't know IDF's anymore - always been a Dellorto guy, but I'd be happy to try and help. Couple of questions:
* What distributor are you using?
* Initial and full timing?
* Idle jet size?
* How many turns out on the idle volume screw?
* Fuel pressure?
-Aaron
Posted by: Borderline Jul 10 2012, 06:18 PM
I have found that balancing the carbs is about the most important thing you can do. I balance the flow (left/right) twice. the first time, as usual, at idle. The second time is to balance the linkage. I adjust the throttle cable to get the engine running at 1500 - 2000 rpm. Then I check the flow (left/right) again. I then adjust the linkage arms to balance the flow. So many people adjust the flow at idle with the linkage disconnected then re-connect the linkage and go. You spend about 90% of the time at partial throttle and it's very important to have the linkage adjusted properly. FWIW 
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