 WTB: 33 or 35 DRLA Pump Jet |
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| yeahmag |
 Aug 14 2018, 04:06 PM
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#1
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Advanced Member  Group: Members Posts: 2,421 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California 
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Anybody sitting on a set of 4 DRLA pump jets in a 33 or 35 size? Thought I'd ask before buying new.
Need to try some smaller ones than what I'm running. Happy to buy or trade for other DRLA parts. I have tons! -Aaron |
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| GregAmy |
Aug 15 2018, 06:51 AM
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#2
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Advanced Member Group: Members Posts: 2,268 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States
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Which ones do you have to trade? I have 35s, I'm currently at 55 actually looking for something larger.
Trying to overcome a bog/flutter on throttle tip-in, to make that transition smoother. 140 mains gets me spot-on for AFR at WOT (mid 12s) but as a test I tried 170 mains; AFR went too rich (of course, low 10s) but the tip-in bog/flutter went away. So I'm thinking I'd try larger accel pump jets. What's your situation? I'm glad to trade but I'm a bit hesitant to give up what I have until I verify the resolution. |
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| GregAmy |
Aug 15 2018, 06:52 AM
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#3
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Advanced Member Group: Members Posts: 2,268 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States
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BY the way, if anyone is sitting on a large collection of jets/tubes for the DRLAs, I'm looking. I'm hoping to find an estate sale or something like that where some guy collected the set and the family just wants to make it go away...a guy can dream...
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| yeahmag |
Aug 15 2018, 09:53 AM
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#4
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Advanced Member Group: Members Posts: 2,421 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California
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QUOTE(GregAmy @ Aug 15 2018, 05:51 AM)  Which ones do you have to trade? I have 35s, I'm currently at 55 actually looking for something larger. Trying to overcome a bog/flutter on throttle tip-in, to make that transition smoother. 140 mains gets me spot-on for AFR at WOT (mid 12s) but as a test I tried 170 mains; AFR went too rich (of course, low 10s) but the tip-in bog/flutter went away. So I'm thinking I'd try larger accel pump jets. What's your situation? I'm glad to trade but I'm a bit hesitant to give up what I have until I verify the resolution. I have modified 35s in there now. I was going down the road of larger and larger pump jets until I switched from setting the float height with the top "upside down" to having the top "hang vertical" and the float just barely resting on the spring for the inlet valve. I'm pretty sure I have a new set of .60 pump jets if you want to try them. We could just mail each other the jets for each other to try. I also have a large selection of jets you can try, but most are reamed and not purchased. I ream and measure... What are the specs on the carbs and motor? Here is my current setup: 40 Dellorto 36 venturi 152 main 200 air 60 idle 35 pump (modified) 5-12 floats, vertical 250 inlet valve -Aaron |
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| GregAmy |
Aug 15 2018, 12:39 PM
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#5
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Advanced Member Group: Members Posts: 2,268 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States
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Yeah, we can mail them across. I'm grabbing the car with support equipment (incl jets case) this weekend from my buddy in NJ (we were racing there a couple weekends ago).
I'm running: 34 venturi 70 idle (too fat) 140 main 55 accel 180 air correction #2 emulsion tubes Don't know floats and inlet, probably whatever is the default. Need to get the engine specs from Chris Foley but it's a light engine build, overbore, warm cams, etc. I'll send you a PM with my info. Greg Edit: attaching a screen shot of AFR data before and after main jet change; you can see how the AFRs pop lean when I tip in, that's why I'm thinking bigger accel jet. Attached thumbnail(s) 
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