 Acc. Pump volume question, Dellortos |
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| type11969 |
 Mar 30 2007, 07:21 AM
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Senior Member  Group: Members Posts: 1,231 Joined: 2-December 03 From: Collingswood, NJ Member No.: 1,410 Region Association: North East States  |
I'm trying to get my Dell 40s set up properly and I'm currently adjusting the pump volume. In the dell tech manual it states that .4-.5ccs should be released for every two throttle pulls for a 1600cc engine. I can only get ~.2ccs for two throttle pulls at max pump stroke. Would changing the pump jet actually change the volume? I don't see how it would. I'm running a 45 for a pump jet, certainly open to suggestions! Also, suggestions regarding how much more pump volume I should be pushing for an 1800cc, pretty mild with 8.2:1 CR and a web 86 over the .4-.5ccs for a 1600?
Thanks, Chris |
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| Joe Ricard |
Aug 2 2007, 03:21 PM
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CUMONIWANNARACEU Group: Members Posts: 6,811 Joined: 5-January 03 From: Gautier, MS Member No.: 92 |
Pump volume is extremely important to smooth take off when you mash the gas.
Pretty simple, if it stumbles you need more gas. Pump jet increase would be my guess if everything else is working properly. I so love my Webers as I can just tighten the nut on the linkage to increase volume. I can see what's going on with my wide band A/F meter. Mash the gas stumble gage shows lean= more adjustment. Mash gas pin head to head rest gage says 12:1 life is good. |
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| terrymason |
Aug 2 2007, 03:42 PM
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Member Group: Members Posts: 346 Joined: 23-November 05 From: Virginia Beach Member No.: 5,174 |
QUOTE(Joe Ricard @ Aug 2 2007, 01:21 PM)  Pump volume is extremely important to smooth take off when you mash the gas. Pretty simple, if it stumbles you need more gas. Pump jet increase would be my guess if everything else is working properly. I so love my Webers as I can just tighten the nut on the linkage to increase volume. I can see what's going on with my wide band A/F meter. Mash the gas stumble gage shows lean= more adjustment. Mash gas pin head to head rest gage says 12:1 life is good. I've got about the same setup, I just want to make sure that both carbs are pumping the same volume with each squirt. |
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Posts in this topic
type11969 Acc. Pump volume question Mar 30 2007, 07:21 AM
gopack Slight HIACK
Isn't a Dell 40 too big for a 18... Mar 30 2007, 07:37 AM type11969 I've been under the impression that I will be ... Mar 30 2007, 07:47 AM terrymason Hey Chris, did you ever get this figured out? Als... Aug 2 2007, 12:43 PM
Joe Ricard I hate instructions but what if.
the meaning of th... Aug 2 2007, 04:06 PM BMartin914 .4cc to .5cc sounds about right (.4cc to .45cc is ... Aug 2 2007, 07:43 PM
type11969 I used a baby medicine dispenser for a graduated c... Aug 7 2007, 12:09 PM |
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