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Re: Holley 750DP adjustment. Secondary stumbling
[Re: Pacnorthcuda]
#1020581
06/27/11 06:02 PM
06/27/11 06:02 PM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
All I said was he could try a 50cc pump. Yes it comes with its own cams. (and arm) see link.
....well, except for this: "The 50cc pump does not add any additional fuel."
http://www.holley.com/data/products/pictures/large20-11.jpg 
I understood what "you" were trying to say from the get go, & if anyone would think a 50cc pump "with its own cams" doesn't deliver more fuel the a 30cc pump needs to go back too science or math class 
Just remember this though, even though these buckets carry this amount of volume, The cams they come with never deliver the "full" amount of that volume, the cams just change the timing & dur. of the volume, the squirters just dump that volume quicker or slower through the shot depending on there size, but your still getting that same amount from the cam you choose.
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Re: Holley 750DP adjustment. Secondary stumbling
[Re: 68Bullit]
#1020582
06/27/11 06:12 PM
06/27/11 06:12 PM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
"Dead Spot" would be another way to describe it. In fact, it's probably a better term to use over "bog" but at any rate it just does not come on like a mech secondary carb should come on and it's clearly noticeable - just falls on it's face for second.
Sounds like a lean stumble/dead spot then recovers when the main curcuit kicks in, make sure there is no slack or up & down motion on the secondary pump arm, this will cause the issue your decribing, if you do get it adj. propperly, & its still there, try the next squirter size up, a .033", you never want to jump way up on sizes, 1 at a time, Now also, make sure the float level is currect, at idle, it should just barely trickle out of the side plug.
If anything, i always advise to get a holley perf. tuneing book, there at any Books-a-million or any major book store like them.
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Re: Holley 750DP adjustment. Secondary stumbling
[Re: joedust451]
#1020583
06/27/11 06:58 PM
06/27/11 06:58 PM
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Joined: Nov 2007
Posts: 21,843
Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,843
Kirkland, Washington
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Quote:
Quote:
All I said was he could try a 50cc pump. Yes it comes with its own cams. (and arm) see link.
....well, except for this: "The 50cc pump does not add any additional fuel."
http://www.holley.com/data/products/pictures/large20-11.jpg
I understood what "you" were trying to say from the get go, & if anyone would think a 50cc pump "with its own cams" doesn't deliver more fuel the a 30cc pump needs to go back too science or math class
Just remember this though, even though these buckets carry this amount of volume, The cams they come with never deliver the "full" amount of that volume, the cams just change the timing & dur. of the volume, the squirters just dump that volume quicker or slower through the shot depending on there size, but your still getting that same amount from the cam you choose.
Agreed! A 50cc pump with a 30cc cam (any of them) is going to behave as a 30cc pump. Trying a 50cc pump means the obvious to most all of us. As stated the bigger cams even come with the kit. Who wouldn't try them??? Its part of the pump package. As far as not actually 30 or 50ccs being delivered 'per shot' I have no doubt thats true. But its become Holley's nomenclature to refer to it as a "30 cc shot" or "50 cc shot". Hopefully the OP gets it worked out.
Squirters may certainly be a better fix for the issue.
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Re: Holley 750DP adjustment. Secondary stumbling
[Re: Pacnorthcuda]
#1020584
06/27/11 10:35 PM
06/27/11 10:35 PM
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Joined: Feb 2005
Posts: 4,318
Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,318
Prospect, PA
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Quote:
As stated the bigger cams even come with the kit.
Right. But thats not always the case. You can, or use to be able to buy only the pump, no cams.
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Re: Holley 750DP adjustment. Secondary stumbling
[Re: joedust451]
#1020585
06/27/11 10:50 PM
06/27/11 10:50 PM
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Joined: Feb 2005
Posts: 4,318
Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,318
Prospect, PA
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Quote:
Quote:
All I said was he could try a 50cc pump. Yes it comes with its own cams. (and arm) see link.
....well, except for this: "The 50cc pump does not add any additional fuel."
http://www.holley.com/data/products/pictures/large20-11.jpg
I understood what "you" were trying to say from the get go, & if anyone would think a 50cc pump "with its own cams" doesn't deliver more fuel the a 30cc pump needs to go back too science or math class
Just remember this though, even though these buckets carry this amount of volume, The cams they come with never deliver the "full" amount of that volume, the cams just change the timing & dur. of the volume, the squirters just dump that volume quicker or slower through the shot depending on there size, but your still getting that same amount from the cam you choose.
"with its own cams" came well after the discussion regarding just the pump. No where prior to that was it mentioned that he was referring to the pump and its own cams, not even implied. In fact he clearly states the cam is soley for rate.
And of course you understand that the total pump volume (not cam delivery volume) is not 30 or 50 cc either....right?
Was math and science backgrounds comment directed to me?
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Re: Holley 750DP adjustment. Secondary stumbling
[Re: BSB67]
#1020586
06/27/11 11:11 PM
06/27/11 11:11 PM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
Quote:
Quote:
All I said was he could try a 50cc pump. Yes it comes with its own cams. (and arm) see link.
....well, except for this: "The 50cc pump does not add any additional fuel."
http://www.holley.com/data/products/pictures/large20-11.jpg
I understood what "you" were trying to say from the get go, & if anyone would think a 50cc pump "with its own cams" doesn't deliver more fuel the a 30cc pump needs to go back too science or math class
Just remember this though, even though these buckets carry this amount of volume, The cams they come with never deliver the "full" amount of that volume, the cams just change the timing & dur. of the volume, the squirters just dump that volume quicker or slower through the shot depending on there size, but your still getting that same amount from the cam you choose.
"with its own cams" came well after the discussion regarding just the pump. No where prior to that was it mentioned that he was referring to the pump and its own cams, not even implied. In fact he clearly states the cam is soley for rate.
And of course you understand that the total pump volume (not cam delivery volume) is not 30 or 50 cc either....right?
Was math and science backgrounds comment directed to me?
I understood exactly what he meant by his 1st. reply  , when you buy the 50cc pump assembly, it comes with the cams, & why would anyone be stupid enough to buy just a 50cc pump & arm & use the 30cc cams  , What good would that do , I'm sure he meant the KIT with the cams, thats how most if not all of them come, as a "complete" kit. I think you just jumped the gun on your responce as he clearly stated in his other responce that he knew they came with there own cams.
Now why would you try an emphasize about them not holding that amount of liquid , Do you know this for a fact! Its CC "Cubic Centimeters" of liquid, It'll push that amount fully compressed from its extended position though the cams won't allow it, but the assembly as a whole buttoned up holds more then 50cc.
http://shop.ebay.com/i.html?_from=R40&am...-All-Categories
Last edited by joedust451; 06/27/11 11:59 PM.
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Re: Holley 750DP adjustment. Secondary stumbling
[Re: joedust451]
#1020587
06/27/11 11:51 PM
06/27/11 11:51 PM
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Joined: Feb 2005
Posts: 4,318
Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,318
Prospect, PA
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Quote:
Quote:
Quote:
Quote:
All I said was he could try a 50cc pump. Yes it comes with its own cams. (and arm) see link.
....well, except for this: "The 50cc pump does not add any additional fuel."
http://www.holley.com/data/products/pictures/large20-11.jpg
I understood what "you" were trying to say from the get go, & if anyone would think a 50cc pump "with its own cams" doesn't deliver more fuel the a 30cc pump needs to go back too science or math class
Just remember this though, even though these buckets carry this amount of volume, The cams they come with never deliver the "full" amount of that volume, the cams just change the timing & dur. of the volume, the squirters just dump that volume quicker or slower through the shot depending on there size, but your still getting that same amount from the cam you choose.
"with its own cams" came well after the discussion regarding just the pump. No where prior to that was it mentioned that he was referring to the pump and its own cams, not even implied. In fact he clearly states the cam is soley for rate.
And of course you understand that the total pump volume (not cam delivery volume) is not 30 or 50 cc either....right?
Was math and science backgrounds comment directed to me?
I understood exactly what he meant by his 1st. reply , when you buy the 50cc pump assembly, it comes with the cams, & why would anyone be stupid enough to buy just a 50cc pump & arm & use the 30cc cams , What good would that do , I'm sure he meant the KIT with the cams, thats how most if not all of them come, as a "complete" kit. I think you just jumped the gun on your responce as he clearly stated in his other responce that he knew they came with there own cams.
Now why would you try an emphasize about them not holding that amount of liquid , Do you know this for a fact! Its CC "Cubic Centimeters" of liquid, so i'm sure it holds damn near that amount of liquid like in a Syringe 
http://shop.ebay.com/i.html?_from=R40&am...-All-Categories
Quote:
What good would that do ,
apparently we agree...nothing.
Quote:
I'm sure he meant the KIT with the cams, thats how most if not all of them come, as a "complete" kit.
Maybe that is what he meant, but not what he said. If that is what he meant, then we all agree.
For as many 336 cams that I have around here, they have probably been coming with the 50 cc kit for a while.
I only mentioned it as the 20 cc difference seemed to be used as an actual volume. I have not measured them, but I do know what 1 cc looks like, and certainly most here would know what 90 cc might look like.... I think you would agree.
The total rated displacement of the cams is rated on 10 pump strokes, and the cams with greater than 30 cc total discarge after 10 strokes will require the larger pump capacity. As mentioned, it is Holleys way to describe them, it not the actual volume.
Last edited by BSB67; 06/28/11 12:02 AM.
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Re: Holley 750DP adjustment. Secondary stumbling
[Re: GwaiiEagle]
#1020589
07/27/11 10:39 PM
07/27/11 10:39 PM
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Joined: Nov 2004
Posts: 2,825
Sk. Canada
RemCharger
master
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master
Joined: Nov 2004
Posts: 2,825
Sk. Canada
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BSB67 has been correct on every post. One needs to be clear on the internet, to avoid assumptions, intentions, telepathic expectations etc. I could see someone putting on just a 50cc pump with no diff cam (maybe had one laying around). After all that I believe everyone is on the same page. To the question on hand,,, I just put on a QF 750 dp in a customers 68 R/T 440, and it had the biggest hole in the secondarys I've evr seen. After a lot of gas and tuning.. I put a 1" open hole spacer and a 50 shooter. The thing would do beautiful rolling stomp on smoke shows. The shooter is probably too big, but I had one and it works. The other problem I saw was the bottom shooter gaskets were wrong and closing up the spacE between the threads.. not good. 
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